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Spatial patterns of large African cats: a large-scale study on density, home range size, and home range overlap of lions Panthera leo and leopards Panthera pardus

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MAMMAL REVIEW 2023年第2期53卷 49-64页

作者： Nams, Vilis O. Parker, Dan M. Weise, Florian J. Patterson, Bruce D. Buij, Ralph Radloff, Frans G. T. Vanak, Abi Tamim. Tumenta, Pricelia. N. Hayward, Matt. W. Swanepoel, Lourens H. Funston, Paul J. Bauer, Hans Power, R. John O'Brien, John O'Brien, Timothy G. Tambling, Craig J. de Iongh, Hans H. Ferreira, Sam M. Owen-Smith, Norman Cain, James W., III Fattebert, Julien Croes, Barbara M. Spong, Goran Loveridge, Andrew J. Houser, Ann Marie Golabek, Krystyna A. Begg, Colleen M. Grant, Tanith Trethowan, Paul Musyoki, Charles Menges, Vera Creel, Scott Balme, Guy A. Pitman, Ross T. Bissett, Charlene Jenny, David Schuette, Paul Wilmers, Christopher C. Hunter, Luke T. B. Kinnaird, Margaret F. Begg, Keith S. Owen, Cailey R. Steyn, Villiers Bockmuehl, Dirk Munro, Stuart J. Mann, Gareth K. H. du Preez, Byron D. Marker, Laurie L. Huqa, Tuqa J. Cozzi, Gabriele Frank, Laurence G. Nyoni, Phumuzile Stein, Andrew B. Kasiki, Samuel M. MacDonald, David W. Martins, Quinton E. van Vuuren, Rudie J. Stratford, Ken J. Bidner, Laura R. Oriol-Cotteril, Alayne Maputla, Nakedi W. Maruping-Mzileni, Nkabeng Parker, Tim Van't Zelfde, Maarten Isbell, Lynne A. Beukes, Otto B. Beukes, Maya Department of Plant Food and Environmental Scienes Faculty of Agriculture Dalhousie University Truro NS B2N 5E3 Canada Wildlife and Reserve Management Research Group Department of Zoology & Entomology Rhodes University P.O. Box 94 Grahamstown 6140 South Africa School of Biology and Environmental Sciences University of Mpumalanga Nelspruit 1200 South Africa Centre for Wildlife Management University of Pretoria Pretoria 0002 South Africa CLAWS Conservancy Pride in Our Prides Worcester MA 01608 USA N/a'an ku sê Research Programme P.O. Box 99292 Windhoek Namibia Negaunee Integrative Research Center Field Museum of Natural History Chicago IL 60605 USA Animal Ecology Group Wageningen University & Research Droevendaalsesteeg 3A 6708 PB Wageningen The Netherlands The Peregrine Fund 5668 West Flying Hawk Lane Boise ID 83709 USA Department of Conservation and Marine Sciences Faculty of Applied Sciences Cape Peninsula University of Technology P.O. Box 652 Cape Town 8000 South Africa Ashoka Trust for Research in Ecology and the Environment Bangalore 560064 India School of Life Sciences University of KwaZulu-Natal Durban 3629 South Africa Department of Forestry Faculty of Agronomy and Agricultural Sciences University of Dschang P.O. Box 138 Yaounde Cameroon Regional Training Centre Specialized in Agriculture Forestry-wood and Environment (CRESA Foret Bois) University of Dschang P.O. Box 138 Yaounde Cameroon Conservation Science Research Group School of Environmental and Life Sciences College of Engineering Science and the Environment University of Newcastle Callaghan NSW 2308 Australia Department of Zoology and Entomology Mammal Research Institute University of Pretoria Pretoria 0002 South Africa Department of Zoology University of Venda Thohoyandou 0950 South Africa Department of Nature Conservation Tshwane University of Technology Private Bag X680 Pretoria 0001 South Africa Panthera New York NY 10018 USA Wildlife Conservation Research Unit Zoology

Spatial patterns of and competition for resources by territorial carnivores are typically explained by two hypotheses: 1) the territorial defence hypothesis and 2) the searching efficiency hypothesis. According to the territorial defence hypothesis, when food resources are abundant, carnivore densities will be high and home ranges small. In addition, carnivores can maximise their necessary energy intake with minimal territorial defence. At medium resource levels, larger ranges will be needed, and it will become more economically beneficial to defend resources against a lower density of competitors. At low resource levels, carnivore densities will be low and home ranges large, but resources will be too scarce to make it beneficial to defend such large territories. Thus, home range overlap will be minimal at intermediate carnivore densities. According to the searching efficiency hypothesis, there is a cost to knowing a home range. Larger areas are harder to learn and easier to forget, so carnivores constantly need to keep their cognitive map updated by regularly revisiting parts of their home ranges. Consequently, when resources are scarce, carnivores require larger home ranges to acquire sufficient food. These larger home ranges lead to more overlap among individuals' ranges, so that overlap in home ranges is largest when food availability is the lowest. Since conspecific density is low when food availability is low, this hypothesis predicts that overlap is largest when densities are the lowest. We measured home range overlap and used a novel method to compare intraspecific home range overlaps for lions Panthera leo (n = 149) and leopards Panthera pardus (n = 111) in Africa. We estimated home range sizes from telemetry location data and gathered carnivore density data from the literature. Our results did not support the territorial defence hypothesis for either species. Lion prides increased their home range overlap at conspecific lower densities whereas leopards did

关键词： African cats home range overlap leopards Panther pardus lions Panthera leo movement searching efficiency territorial defence

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development of N-doped rGO/NiFe₂O₄ nanocomposite for supercapacitor application

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Journal of the Indian Chemical Society 2025年第6期102卷

作者： Tahir, Kiran Kumar, Abhinav Alsalhi, Sarah A. Makasana, Jayanti M M, Rekha Kumar, G. Senthil Al-Anber, Mohammed A. Das, Sankar Narayan Chaudhary, Rahul Raj Oza, Ankit D. Department of Chemistry Government Graduate College Taunsa Sharif 32100 Pakistan Department of Nuclear and Renewable Energy Ural Federal University Named after the First President of Russia Boris Yeltsin Ekaterinburg 620002 Russian Federation Department of Mechanical Engineering and Renewable Energy Technical Engineering College The Islamic University Najaf Iraq Department of Physics College of Science Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia Marwadi University Research Center Department of Mechanical Engineering Faculty of Engineering & Technology Marwadi University Gujarat Rajkot 360003 India Department of Chemistry and Biochemistry School of Sciences JAIN (Deemed to be University) Karnataka Bangalore India Department of Mechanical Engineering Sathyabama Institute of Science and Technology Tamil Nadu Chennai India Department of Chemistry Faculty of Sciences Applied Science Private University P.O. Box 166 Amman 11931 Jordan Department of Mechanical Engineering Siksha 'O' Anusandhan (Deemed to be University) Odisha Bhubaneswar 751030 India Department of Mechanical Engineering Chandigarh Engineering College Chandigarh Group of Colleges-Jhanjeri Punjab Mohali 140307 India University Centre for Research and Development Chandigarh University Punjab Mohali 140413 India Centre for Research Impact & Outcome Chitkara University Institute of Engineering and Technology Chitkara University Punjab Rajpura 140401 India

Efficient and clean energy storing technologies are essential for controlling pollution resulting from the rising consumption of fossil fuels. Nowadays, supercapacitors (SC_s) are gaining significant consideration as energy storing devices. In this work, hydrothermal approach was used to fabricate NiFe₂O₄ (NFO) and N-rGO/NFO nanocomposite. Electrodes were fabricated and underwent electrochemical evaluation utilizing the synthesized nanocomposite materials. At 1 A g⁻¹, N-rGO/NFO demonstrated specific capacitances (C_s) of 1727.81 F g⁻¹. At all current densities (C_d), the N-rGO/NFO nanocomposite surpasses the NFO regarding charge storage capacity. The persistent anchoring of NFO nanoparticles throughout the N-rGO layers and other structural flaws is likely responsible. N-rGO/NFO nanocomposite exhibits significant stability after the 5000^th cycle. © 2025 Indian Chemical Society

关键词： High energy density NiFe2O4 Nitrogen doped rGO Remarkable specific capacitance Supercapacitor

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Synthesis and study of ScN thin films

arXiv

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arXiv 2021年

作者： Chowdhury, Susmita Gupta, Rachana Rajput, Parasmani Tayal, Akhil Rao, Dheemahi Sekhar, Reddy Prakash, Shashi Rajagopalan, Ramaseshan Jha, S.N. Saha, Bivas Gupta, Mukul Applied Science Department Institute of Engineering and Technology DAVV Indore452017 India Beamline Development and Application Section Physics Group Bhabha Atomic Research Centre Mumbai400085 India Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 HamburgD-22607 Germany Chemistry and Physics of Materials Unit Jawaharlal Nehru Centre for Advanced Scientific Research Bengaluru560064 India International Centre for Materials Science Jawaharlal Nehru Centre for Advanced Scientific Research Bengaluru560064 India Jawaharlal Nehru Centre for Advanced Scientific Research Bengaluru560064 India Surface and Nanoscience Division Materials Science Group Indira Gandhi Centre for Atomic Research HBNI Kalpakkam 603102 India UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore452 001 India

To contemplate an alternative approach for the minimization of diffusion at high temperature depositions, present findings impart viability of room-temperature deposited reactively sputtered ScN thin film samples. The adopted room temperature route endows precise control over the RN2 flow for a methodical structural phase evolution from Sc→ScN and probe the correlated physical aspects of the highly textured ScN samples. In the nitrided regime i.e. at RN2 = 2.5 - 100% flow, incorporation of unintentional oxygen defects were evidenced from surface sensitive soft x-ray absorption spectroscopy study, though less compared to their metal (RN2 = 0%) and interstitial (RN2 = 1.6%) counterparts, due to higher Gibb's free energy for Sc-O-N formation with no trace of ligand field splitting around the O K-edge spectra. To eradicate the sceptism of appearance of N K-edge (401.6 eV) and Sc L-edge (402.2 eV) absorption spectra adjacent to each other, the nascent Sc K-edge study has been adopted for the first time to validate complementary insight on the metrical parameters of the Sc-N system taken into consideration. Optical bandgaps of the polycrystalline ScN thin film samples were found to vary between 2.25 - 2.62 eV as obtained from the UV-Vis spectroscopy, whereas, the nano-indentation hardness and modulus of the as-deposited samples lie between 15 - 34 GPa and 152 - 476 GPa, respectively following a linearly increasing trend of resistance to plastic deformations. Besides, contrary to other early 3d transition metal nitrides (TiN, VN, CrN), a comprehensive comparison of noticeably large homogeneity range in Sc-N has been outlined to apprehend the minuscule lattice expansion over the large RN2 realm. Copyright © 2021, The Authors. All rights reserved.

关键词： Thin films

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Discovery of a Bloch Point Quadrupole Coupling Topological Skyrmions and Antiskyrmions into Hybrid Strings via Holographic Vector Field Electron Tomography

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Yasin, Fehmi Sami Masell, Jan Takahashi, Yoshio Akashi, Tetsuya Baba, Norio Karube, Kosuke Shindo, Daisuke Arima, Takahisa Taguchi, Yasujiro Tokura, Yoshinori Tanigaki, Toshiaki Yu, Xiuzhen RIKEN Center for Emergent Matter Science (CEMS) Wako Japan Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee United States Institute of Theoretical Solid State Physics Karlsruhe Institute of Technology (KIT) Karlsruhe Germany Research and Development Group Hitachi Ltd. Hatoyama Saitama Japan Research Institute for Science and Technology Kogakuin University Hachioji Tokyo Japan Department of Advanced Materials Science University of Tokyo Kashiwa Japan Department of Applied Physics University of Tokyo Tokyo Japan Tokyo College University of Tokyo Tokyo Japan

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Corrigendum to “Integrating solar-powered branched GAX cycle and Claude cycle for producing liquid hydrogen: Comprehensive study using real data and optimization” [Energy 283 (2024) 133496]

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Energy 2025年 314卷

作者： Zhang Yamin A.S. El-Shafay Manish Saraswat Ibrahim Mahariq Fahad Mohammed Alhomayani Husam Rajab Sattam Fahad Almojil Abdulaziz Ibrahim Almohana Mika Sillanpää School of Mathematics and Information Science Baoji University of Arts and Sciences 721000 China Department of Mechanical Engineering College of Engineering in Al-Kharj Prince Sattam bin Abdulaziz University Al-Kharj 11942 Saudi Arabia Mechanical Power Engineering Department Faculty of Engineering Mansoura University Mansoura 35516 Egypt Department of Mechanical Engineering LLOYD Institute of Engineering and technology Greater Noida 201306 India Department of Mechanical Engineering Institute of Engineering and technology GLA University Mathura 281406 India GUST Engineering and Applied Innovation Research Center (GEAR) Gulf University for Science and Technology Mishref Kuwait Applied Science Research Center Applied Science Private University Amman Jordan Department of Medical Research China Medical University Hospital China Medical University Taichung Taiwan College of Computers and Information Technology Taif University Saudi Arabia College of Engineering Department of Mechanical Engineering Najran University King Abdulaziz Road P.O Box 1988 Najran Saudi Arabia Department of Civil Engineering College of Engineering King Saud University P.O. Box 800 Riyadh 11421 Saudi Arabia Functional Materials Group Gulf University for Science and Technology Mubarak Al-Abdullah 32093 Kuwait Kuwait School of Technology Woxsen University Hyderabad Telangana India Centre of Research Impact and Outcome Chitkara University Institute of Engineering and Technology Chitkara University Rajpura 140401 Punjab India Division of Research & Development Lovely Professional University Phagwara 144411 Punjab India Department of Civil Engineering University Centre for Research & Development Chandigarh University Gharuan Mohali Punjab India

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Stimuli-responsive smart nanomaterials for theranostics of urological cancers

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Coordination Chemistry Reviews 2025年 539卷

作者： Xu, Yi Moradialvand, Madineh Sala, Francesca Della Zare, Ehsan Nazarzadeh Hushmandi, Kiavash Rahimmanesh, Ilnaz Borzacchiello, Assunta Iravani, Siavash Zare, Iman Shin, Jungah Yoon, Juyoung Kang, Heemin Makvandi, Pooyan Department of Urology Department of Science & Technology Nano Medical Innovation & Collaboration Group (NMICG) The Quzhou Affiliated Hospital of Wenzhou Medical University Quzhou People's Hospital Quzhou 324000 China The Quzhou Affiliated Hospital of Wenzhou Medical University Quzhou People's Hospital Quzhou 324000 China Center for Theoretical Physics Khazar University 41 Mehseti Street Baku AZ1096 Azerbaijan Institute of Polymers Composites and Biomaterials National Research Council (IPCB-CNR) Viale J.F. Kennedy 54 Naples 80125 Italy School of Chemistry Damghan University Damghan 36716-45667 Iran Nephrology and Urology Research Center Clinical Sciences Institute Baqiyatallah University of Medical Sciences Tehran Iran Applied Physiology Research Center Cardiovascular Research Institute Isfahan University of Medical Sciences Isfahan Iran W Nazar ST Boostan Ave Isfahan Iran Research and Development Department Sina Medical Biochemistry Technologies Co. Ltd. Shiraz *** Iran Department of Materials Science and Engineering Korea University Seoul 02841 South Korea Department of Chemistry and Nanoscience Ewha Womans University Seoul 03760 South Korea Graduate Program in Innovative Biomaterials Convergence Ewha Womans University Seoul 03760 South Korea College of Medicine Korea University Seoul 02841 South Korea

Urological cancers, including prostate, bladder, and kidney cancers, contribute significantly to the global burden of cancer-related mortality. While numerous reviews have addressed these cancers individually, this is the first comprehensive review that exclusively focuses specifically on nanotheranostics as a transformative approach for urological cancer. The distinct tumor microenvironments (TMEs) associated with these cancers pose both challenges and opportunities for precise nanotherapeutic interventions. This review provides a thorough examination of current advancements in nanotechnology-based diagnostics and therapeutics tailored to urological cancers. For each primary urological cancer type, we outline key strategies for leveraging nanotheranostics in the detection and treatment of tumors. Furthermore, we address the persisting challenges in enhancing tumor specificity and treatment efficacy. In essence, nanotheranostics offer a promising therapeutic avenue for urological cancers by enabling targeted drug delivery and controlled release of therapeutics within the tumor microenvironment. The objective of this pioneering review is to underscore recent developments and future prospects in utilizing nanotechnology to meet the unmet needs in the diagnosis and treatment of urological cancers. © 2025 Elsevier B.V.

关键词： Bladder Kidney cancers Nanocarriers Nanomaterials Prostate tumor Urological cancers

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Molecular dynamics performance for coronavirus simulation by C, N, O, and S atoms implementation dreiding force field: drug delivery atomic interaction in contact with metallic Fe, Al, and steel

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Computational particle mechanics 2021年第4期8卷 737-749页

作者： Aliakbar Karimipour Ali Amini Mohammad Nouri Annunziata D'Orazio Roozbeh Sabetvand Maboud Hekmatifar Azam Marjani Quang-Vu Bach Institute of Research and Development Duy Tan University Da Nang 550000 Vietnam. Department of Mechanical Engineering Najaf Abad University Esfahan Iran. Dipartimento di Ingegneria Astronautica Elettrica ed Energetica Sapienza Università di Roma Via Eudossiana 18 00184 Roma Italy. Department of Energy Engineering and Physics Faculty of Condensed Matter Physics Amirkabir University of Technology Tehran Iran. Department of Mechanical Engineering Khomeini Shahr University Esfahan Iran. Department for Management of Science and Technology Development Ton Duc Thang University Ho Chi Minh City Vietnam. Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Vietnam. Sustainable Management of Natural Resources and Environment Research Group Faculty of Environment and Labour Safety Ton Duc Thang University Ho Chi Minh City Vietnam.

Coronavirus causes some illnesses to include cold, COVID-19, MERS, and SARS. This virus can be transmitted through contact with different atomic matrix between humans. So, this atomic is essential in medical cases. In this work, we describe the atomic manner of this virus in contact with various metallic matrix such as Fe, Al, and steel with equilibrium molecular dynamic method. For this purpose, we reported physical properties such as temperature, total energy, distance and angle of structures, mutual energy, and volume variation of coronavirus. In this approach, coronavirus is precisely simulated by O, C, S, and N atoms and they are implemented dreiding force field. Our simulation shows that virus interaction with steel matrix causes the maximum removing of the virus from the surfaces. After 1 ns, the atomic distance between these two structures increases from 45 to 75 Å. Furthermore, the volume of coronavirus 14.62% increases after interaction with steel matrix. This atomic manner shows that coronavirus removes and destroyed with steel surface, and this metallic structure can be a promising material for use in medical applications.

关键词： Atomic interaction Coronavirus Metallic matrix Molecular dynamic simulation

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Furfural removal from water by bioremediation process by indigenous Pseudomonas putida (OSBH3) and Pseudomonas aeruginosa (OSBH4) using novel suphala media: An optimization for field application

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Groundwater for Sustainable development 2023年 20卷

作者： Maity, Jyoti Prakash Chandra Samal, Alok Rajnish, Kumar Singha, Shuvendu Sahoo, Tapas Ranjan Chakraborty, Sudip Bhattacharya, Prosun Chakraborty, Sukalyan Sarangi, Bhabani Sankar Dey, Gobinda Banerjee, Pritam Chen, Chien-Yen Chandra Santra, Subhas Environmental Science Laboratory Department of Chemistry School of Applied Sciences KIIT Deemed to be University Odisha Bhubaneswar751024 India Department of Environmental Science University of Kalyani Nadia West Bengal 741235 India ENVIS Programme Cell Ministry of Environment Forest and Climate Change Indira Paryavaran Bhawan Jor Bagh Road New Delhi110003 India University of Calabria Rende Italy KTH-International Groundwater Arsenic Research Group Department of Sustainable Development Environmental Science and Engineering KTH Royal Institute of Technology Teknikringen 10B StockholmSE-100 44 Sweden Department of Civil & Environmental Engineering Birla Institute of Technology Jharkhand 835215 India Department of Biomedical Sciences Graduate Institute of Molecular Biology National Chung Cheng University 168 University Road Ming-Shung Chiayi County62102 Taiwan Department of Earth and Environmental Sciences National Chung Cheng University 168 University Road Ming-Shung Chiayi County62102 Taiwan

The release of furfural as effluent from industries has been considered a major pollution source since it adversely affects health and the environment. In a proper nutrient condition, the indigenous microbial removal process is always considered efficient, economical, and eco-friendly. Thus, the main objective is to employ the effective indigenous bacteria to remove the furfural from wastewater. In the present study, the indigenous isolates OSBH3 (strain number) and OSBH4 (strain number) were isolated from furfural-containing-oily-sludge and were identified by 16S-rRNA technique with >99% nucleotide similarity as Pseudomonas putida (P. putida) (Acc. No. GU329915) and Pseudomonas aeruginosa (P. aeruginosa) (Acc. No. GU329916) respectively. In a batch experiment, the furfural degradation was observed higher in the presence of the most efficient isolate P. putida (compare to P. aeruginosa) at different nutrient conditions including Suphala (Nitrogen-Phosphorous-fertilizer), glucose, and carbohydrate-free synthetic media (CFM). Generally, the furfural degradation rate was lower in CFM than the other substrates (Nitrogen-Phosphorous-fertilizer/glucose), in the presence of P. putida or P. aeruginosa. The furfural degradation efficiency was observed higher in presence of P. putida, compare to P. aeruginosa. Experimentally, the total (100%) degradation of furfural (500 mg/L) was noticed by P. Putida within 12h incubation time in presence of 1 mg/L Suphala. Even among different factors (based on ‘Taguchi L9 orthogonal array study’), the suphala (Nitrogen-Phosphorous-fertilizer) was influential in degrading the furfural at level 2, where the effects of pH and glucose were noticed at level 2 and level 2, respectively. The experimental findings supported the orthogonal array study positively. The bacterial (P. putida) growth rate and furfural degradation were promoted at the condition of 1 mg/L suphala, 2 mg/L glucose (pH 7.2), where the furfural was used by P. putida as the so

关键词： Glucose

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The effect of organic ligand length on structural, vibrational and electrical properties of low-dimensional cobalt hybrid perovskites

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Materials Today: Proceedings 2024年

作者： Afif Akmal Afkauni Pramitha Yuniar Diah Maulida Sri Hartati Irma Mulyani Rossyaila Matsna Muslimawati Abdulloh Rifai Akmal Zulfi Azis Yudhowijoyo Lina Jaya Diguna Djulia Onggo Muhammad Haris Mahyuddin Muhammad Danang Birowosuto Arramel Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten 15314 Indonesia Inorganic and Physical Chemistry Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia Research Group of Advanced Functional Materials Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia Research Center for Advanced Materials National Research and Innovation Agency (BRIN) South Tangerang Banten 15314 Indonesia Research Center for Environmental and Clean Technology National Research and Innovation Agency (BRIN) Komplek BRIN Cisitu Bandung 40135 Indonesia Department of Renewable Energy Engineering Universitas Prasetiya Mulya Kavling Edutown I.1 Jl. BSD Raya Utama BSD City Tangerang 15339 Indonesia Łukasiewicz Research Network-PORT Polish Center for Technology Development Stabłowicka 147 54-066 Wrocław Poland

Recently, two-dimensional hybrid organic–inorganic perovskites (2D-HOIPs) have emerged in popularity due to ease of tunability in terms of the structure and properties. However, a systematic chemistry and physical description of cobalt-based system is lacking. In this study, we employ X-ray diffraction, Raman spectroscopy and electrochemical impedance spectroscopy (EIS) techniques to investigate the effect of the organic ligand length on the structural, vibrational, and electrical properties of A 2 CoCl 4 [A = methylammonium (MA), ethylammonium (EA) and butylammonium (BA)] perovskite. Results from the measurements showed a noticeable difference and showed potential usage in future applications in the field of electronics.

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Timing and noise analysis of five millisecond pulsars observed with MeerKAT

arXiv

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arXiv 2025年

作者： Chisabi, M. Andrianomena, S. Enwelum, U. Gasennelwe, E.G. Idris, A. Idogbe, E.A. Shilunga, S. Geyer, M. Reardon, D.J. Okany, C.F. Shamohammadi, M. Shannon, R.M. Krishnan, V. Venkatraman Abbate, F. Kramer, M. Department of Physics & Astronomy University of Nigeria Nsukka410101 Nigeria Department of Physics The Copperbelt University Jambo Drive Kitwe21696 Zambia SARAO Liesbeek House River Park Liesbeek Parkway Settlers Way Cape Town7705 South Africa Department of Physics & Astronomy University of the Western Cape Cape Town7535 South Africa Department of Science Laboratory Technology University of Nigeria Nsukka Nigeria Department of Physics University of Botswana Gaborone Botswana National Space Research and Development Agency Centre for Basic Space Science Nsukka410102 Nigeria Department of Physics Chemistry and Material Science University of Namibia Private Bag 13301 Windhoek Namibia Group Department of Mathematics and Applied Mathematics University of Cape Town Rondebosch7701 South Africa Centre for Astrophysics and Supercomputing Swinburne University of Technology P.O. Box 218 HawthornVIC3122 Australia Australia Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany INAF - Osservatorio Astronomico di Cagliari Via della Scienza 5 SelargiusI-09047 Italy

Millisecond pulsars (MSPs) in binary systems are precise laboratories for tests of gravity and the physics of dense matter. Their orbits can show relativistic effects that provide a measurement of the neutron star mass and the pulsars are included in timing array experiments that search for gravitational waves. Neutron star mass measurements are key to eventually solving the neutron star equation of state and these can be obtained by a measure of the Shapiro delay if the orbit is viewed near edge-on. Here we report on the timing and noise analysis of five MSPs observed with the MeerKAT radio telescope: PSRs J0900−3144, J0921−5202, J1216−6410, J1327−0755 and J1543−5149. We searched for the Shapiro delay in all of the pulsars and obtain weak detections for PSRs J0900−3144, J1216−6410, and J1327−0755. We report a higher significance detection of the Shapiro delay for PSR J1543−5149, giving a precise pulsar mass of Mp = 1.349+−00043061 M☉ and companion white-dwarf mass Mc = 0.223+−00005007 M☉. This is an atypically low mass measurement for a recycled MSP. In addition to these Shapiro delays, we also obtain timing model parameters including proper motions and parallax constraints for most of the pulsars. Copyright © 2025, The Authors. All rights reserved.

关键词： White dwarfs

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