🔭 Category

astro-ph.HE

272 papers

LeMMINGs VII: 5 GHz, 50 mas e-MERLIN observations of a statistically complete sample of nearby AGN

This paper presents high-resolution 5 GHz e-MERLIN observations of a statistically complete sample of nearby galaxies, revealing that compact radio cores and jets are the primary manifestation of black hole activity in the local Universe, with up to 30% of galaxies hosting such radio-active nuclei.

D. R. A. Williams-Baldwin (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), R. D. Baldi (INAF - Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy), R. J. Beswick (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), I. M. McHardy (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), E. Carver (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), J. Clifford (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), B. T. Dullo (Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA), N. Kill (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), B. Krishnamoorthi (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), I. M. Mutie (Department of Astronomy and Space Science, Technical University of Kenya, P.O Box 52428 - 00200, Nairobi, Kenya, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), O. Woodcock (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), M. K. Argo (Jeremiah Horrocks Institute, School of Engineering and Computing, University of Lancashire, Preston PR1 2HE, UK), P. Boorman (Cahill Center for Astrophysics, California Institute of Technology, 1216 East California Boulevard, Pasadena, CA 91125, USA), E. Brinks (Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK), D. M. Fenech (SKAO, Jodrell Bank, Lower Withington, Macclesfield, SK11 9FT, UK), J. H. Knapen (Instituto de Astrofísica de Canarias, Vía Láctea S/N, E-38205 La Laguna, Spain, Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain), S. Mathur (Astronomy Department, The Ohio State University, Columbus, OH, 43210, USA, Center for Astronomy and Astro-particle Physics, The Ohio State University, Columbus, OH 43210, USA, Eureka Scientific, 2452 DELMER ST STE 100, Oakland, CA, 94602, USA), J. Moldon (Instituto de Astrofísica de Andalucía), T. W. B. Muxlow (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), M. Pahari (Department of Physics, Indian Institute of Technology, Hyderabad 502285, India), N. H. Wrigley (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), A. Alberdi (Instituto de Astrofísica de Andalucía), W. Baan (Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China, Netherlands Institute for Radio Astronomy), A. Beri (Indian Institute of Science Education and Research, School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK, Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560034, India), X. Cheng (Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Korea), D. A. Green (Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK), J. Healy (United Kingdom SKA Regional Centre, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), P. Kharb (National Centre for Radio Astrophysics), E. Körding (Department of Astrophysics/IMAPP, Radboud University, P.O. Box 9010, 6500GL Nijmegen, The Netherlands), G. Lucatelli (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK), F. Panessa (INAF - Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Roma, Italy), M. Puig-Subirà (Instituto de Astrofísica de Andalucía), C. Romero-Cañizales (Institute of Astronomy and Astrophysics, Academia Sinica, 11F of AS/NTU Astronomy-Mathematics Building, No.1, Sec. 4, Roosevelt Rd, Taipei 106319, Taiwan), D. J. Saikia (Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany, Assam Don Bosco University, Guwahati 781017, Assam, India), P. Saikia (Center for Astro, Particle and Planetary Physics, Department of Astronomy, Yale University, PO Box 208101, New Haven, CT 06520-8101, USA), F. Shankar (School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK), S. Sharma (Department of Physics, Indian Institute of Technology, Hyderabad 502285, India), I. R. Stevens (School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK), E. Varenius (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UK)Tue, 10 Ma🔭 astro-ph

Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions

This paper analyzes GRB 250129A and concludes that its multiple late-time afterglow rebrightenings are best explained by a sequence of refreshed shocks from delayed relativistic shell collisions, rather than single external-shock evolution or one-time energy injection.

D. Akl, S. Antier, H. Koehn, P. T. H. Pang, J. J. Geng, R. Gill, E. Abdikamalov, C. Adami, V. Aivazyan, L. Almeida, S. Alshamsi, C. Andrade, Q. André, C. Angulo-Valdez, J. -L. Atteia, K. Barkaoui, S. Basa, R. L. Becerra, P. Bendjoya, D. Berdikhan, E. Bernaud, S. Boissier, S. Brunier, A. Y. Burdanov, N. R. Butler, J. Chen, F. Colas, W. Corradi, M. W. Coughlin, D. Darson, T. Dietrich, D. Dornic, C. Douzet, C. Dubois, J. -G. Ducoin, T. du Laz, A. Durroux, D. Dutton, P. -A. Duverne, F. Dux, E. G. Elhosseiny, A. Esamdin, A. V. Filippenko, F. Fortin, M. Freeberg, L. García-García, M. Gillon, N. Globus, P. Gokuldass, N. Guessoum, P. Hello, R. Hellot, Y. H. M. Hendy, Y. L. Hua, T. Hussenot-Desenonges, R. Inasaridze, A. Iskandar, M. Jelínek, S. Karpov, A. Klotz, N. Kochiashvili, T. Laskar, A. Le Calloch, W. H. Lee, S. Leonini, X. Y. Li, A. Lien, C. Limonta, J. Liu, D. López-Cámara, F. Magnani, J. Mao, M. Mašek, E. Moreno Méndez, L. C. Menegazzi, W. Mercier, B. M. Mihov, M. Molham, S. Oates, M. Odeh, H. Peng, M. Pereyra, M. Pillas, T. Pradier, N. A. Rakotondrainibe, D. Reichart, J. -P. Rivet, F. D. Romanov, F. Sánchez-Álvarez, N. Sasaki, D. Schlekat, B. Schneider, A. Simon, L. Slavcheva-Mihova, R. Strausbaugh, T. R. Sun, A. Takey, M. Tanasan, D. Turpin, A. de Ugarte Postigo, L. T. Wang, X. F. Wang, Z. M. Wang, A. M. Watson, J. de Wit, Y. S. Yan, W. Zheng, S. Zúñiga-FernándezTue, 10 Ma🔭 astro-ph

How interacting winds shape the mechanical feedback of massive star clusters over millions of years

This study utilizes 3D magnetohydrodynamic simulations to demonstrate that the structure and mechanical feedback of massive star cluster winds are determined by the surrounding cavity's density and pressure, enabling a novel, computationally efficient method to model wind termination shocks across different cluster ages and validate them with a semi-analytical approach.

Thibault Vieu, Lucia Härer, Brian RevilleTue, 10 Ma🔭 astro-ph

Double White Dwarf Mergers as Progenitors of Long-Period Transients

This paper proposes that long-period transients like GLEAM-X J1627-5235 are isolated, massive, highly magnetized white dwarf pulsars formed via double white dwarf mergers, a model that successfully explains their observed rotational periods and lack of optical counterparts.

Manuel Malheiro, Sarah V. Borges, Jaziel G. Coelho, Khashayar Kianfar, Ronaldo V. Lobato, Edson Otoniel, Jorge A. Rueda, Manoel F. Sousa, Fridolin WeberTue, 10 Ma🔭 astro-ph

Compression-Driven Kinetic Instabilities in Magnetically Arrested Disks

This study employs 2D particle-in-cell simulations to demonstrate that continuous compression in magnetically arrested disk plasmas drives pressure anisotropy and triggers kinetic instabilities like the ion cyclotron and mirror modes, which regulate anisotropies and generate nonthermal energy spectra in ways that depend critically on plasma beta, temperature, and compression rates, thereby providing essential constraints for global fluid models of black hole accretion.

Vedant Dhruv, Lorenzo Sironi, Jordy Davelaar, Aaron TranTue, 10 Ma🔭 astro-ph

Impact of Resonant Compton Scattering on Magnetar X-Ray Polarization with QED Vacuum Resonance

This paper presents a semi-analytical framework demonstrating that resonant Compton scattering in magnetar magnetospheres, driven by magnetic twist and plasma drift velocity, can significantly alter soft X-ray polarization signatures by either suppressing vacuum resonance-induced polarization angle swings or introducing new relativistic $90^\circ$ swings, thereby offering an efficient alternative to complex Monte Carlo simulations for interpreting data from X-ray polarization missions.

Tu Guo, Dong LaiTue, 10 Ma🔭 astro-ph

Exploring the spin dependence on mass inclination and distance for the newly discovered black hole X-ray binary Swift J151857.0-572147

This paper analyzes NICER observations of the newly discovered black hole X-ray binary Swift J151857.0-572147 to demonstrate how its spin parameter depends on mass, inclination, and distance, yielding a moderate spin of approximately 0.7 for fiducial values while establishing a framework for more precise future determinations.

Yujia Song, James F. Steiner, Tong Zhao, Yuexin Zhang, Ningyue Fan, Ole König, Santiago Ubach, Josephine Wong, Lijun Gou, Javier A. GarciaTue, 10 Ma🔭 astro-ph

Discovery of a 36-minute long-period transient ASKAP J142431.2-612611

This paper reports the discovery of ASKAP J142431.2-612611, a new 36-minute period radio transient observed for eight days with 100% polarized emission that subsequently switched off, offering new insights into the intermittent nature and polarization mechanisms of long-period transients.

Joshua Pritchard, Tara Murphy, Dougal Dobie, Emil Lenc, Akash Anumarlapudi, Manisha Caleb, Sophia Grainger, Natasha Hurley-Walker, David L. Kaplan, Samuel J. McSweeney, Jackson Mitchell-Bolton, Kovi Rose, Rahul Sengar, Ziteng Wang, Jayde Willingham, Andrew ZicTue, 10 Ma🔭 astro-ph

Flip-flop states in X-ray binaries and changing-state AGN

This paper proposes that the rapid "flip-flop" spectral transitions observed in X-ray binaries and the changing-state phenomena in active galactic nuclei are scale-invariant manifestations of the same underlying accretion physics, occurring at a few percent of the Eddington luminosity with transition timescales that scale linearly with mass.

Thomas J. Maccarone (Texas Tech), Jessie Runnoe (Vanderbilt), Gregoire Marcel (Turku), Emilia Jaervelae (Texas Tech), Douglas Buisson (independent scientist), Unnati Kashyap (Texas Tech), Federico M. Vincentelli (Coventry, INAF-IAPS, Southampton)Tue, 10 Ma🔭 astro-ph

A Delayed Radio Flare Traces Kinetic Energy Injection in the SMBHB Candidate SDSS~J143016.05+230344.4

This paper presents multi-epoch VLBI and spectral monitoring of the supermassive black hole binary candidate SDSS J143016.05+230344.4, revealing a delayed radio flare that traces kinetic energy injection from a compact synchrotron component interacting with a structured circumnuclear medium.

Tao An, Ailing Wang, Yingkang Zhang, Lei Yang, Xinwen Shu, Fabao Zhang, Ning Jiang, Tinggui Wang, Huan Yang, Zhen Pan, Liming Dou, Zhijun Xu, Zhenya Zheng, Ruqiu Lin, Xiaofeng LiTue, 10 Ma🔭 astro-ph

Flux Variations of Fast Radio Bursts and Their Persistent Radio Sources: Evidence for a Shared Progenitor

This paper reports a novel correlated trend between the long-term flux variations of persistent radio sources and the burst energetics of specific fast radio bursts (FRB 20190520B and FRB 20240114A), providing evidence that both phenomena may be powered by a shared energy reservoir, such as a magnetar.

Xinming Li, Chenhui Niu, Jiaheng Zhang, Di Li, Bing Zhang, Yuanpei Yang, Pei Wang, Junshuo Zhang, Yongkun Zhang, Ye Li, Jiarui Niu, Xiaoping Zheng, Yunwei Yu, Yi Feng, Fayin Wang, Yuhao Zhu, Aming Chen, Zexin Du, Jian Li, Weihong Li, Chenchen Miao, Weiyang Wang, Guanglei Wu, Aiyuan Yang, Jumei Yao, Rushuang ZhaoTue, 10 Ma🔭 astro-ph

Anisotropic Diffusion in Pulsar Halos: Interpreting the asymmetric morphology of Geminga and Monogem halos measured by HAWC

This paper utilizes an anisotropic diffusion model to interpret the asymmetric morphologies of the Geminga and Monogem pulsar halos observed by HAWC, revealing distinct magnetic field orientations and a local coherence length of approximately 100 pc, thereby establishing halo morphology as a powerful diagnostic tool for interstellar magnetic turbulence.

Si-Zhe Wu, Chao-Ming Li, Ruo-Yu LiuTue, 10 Ma🔭 astro-ph

Interpreting Swift and NuSTAR Observations of the Low-Luminosity Active Galactic Nucleus NGC 4278 with Radiatively Inefficient Accretion Flows and Implications for Neutrino Emission

This paper presents the first NuSTAR hard X-ray observations of the low-luminosity active galactic nucleus NGC 4278, interpreting its variable spectrum through a radiatively inefficient accretion flow model to explain the origin of its emission and constrain the production sites of associated TeV gamma rays and potential neutrinos.

Abhishek Das, Qi Feng, Eleanor Young, Ashwani Pandey, Shigeo S. Kimura, Kohta MuraseTue, 10 Ma🔭 astro-ph