Pulsars, transients and relativistic astrophysics

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Cyclotron line evolution revealed with pulse-to-pulse analysis in the 2020 outburst of 1A 0535+262

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 528:4 (2024) 7320-7332

Authors:

Qing C Shui, S Zhang, Peng J Wang, Alexander A Mushtukov, A Santangelo, Shuang N Zhang, Ling D Kong, L Ji, Yu P Chen, V Doroshenko, F Frontera, Z Chang, Jing Q Peng, Hong X Yin, Jin L Qu, L Tao, Ming Y Ge, J Li, Wen T Ye, Pan P Li

Rapid spin changes around a magnetar fast radio burst

Nature Springer Nature 626:7999 (2024) 500-504

Authors:

Chin-Ping Hu, Takuto Narita, Teruaki Enoto, George Younes, Zorawar Wadiasingh, Matthew G Baring, Wynn CG Ho, Sebastien Guillot, Paul S Ray, Tolga Güver, Kaustubh Rajwade, Zaven Arzoumanian, Chryssa Kouveliotou, Alice K Harding, Keith C Gendreau

The RATT PARROT: serendipitous discovery of a peculiarly scintillating pulsar in MeerKAT imaging observations of the Great Saturn – Jupiter Conjunction of 2020. I. Dynamic imaging and data analysis

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 528:4 (2024) 6517-6537

Authors:

OM Smirnov, BW Stappers, C Tasse, HL Bester, H Bignall, MA Walker, M Caleb, KM Rajwade, S Buchner, P Woudt, M Ivchenko, L Roth, JE Noordam, F Camilo

The Thousand-Pulsar-Array programme on MeerKAT -- XII. Discovery of long-term pulse profile evolution in 7 young pulsars

(2024)

Authors:

A Basu, P Weltevrede, MJ Keith, S Johnston, A Karastergiou, LS Oswald, B Posselt, X Song, AD Cameron

Chasing the Break: Tracing the Full Evolution of a Black Hole X-Ray Binary Jet with Multiwavelength Spectral Modeling

The Astrophysical Journal American Astronomical Society 962:2 (2024) 116-116

Authors:

Constanza Echiburú-Trujillo, Alexandra J Tetarenko, Daryl Haggard, Thomas D Russell, Karri II Koljonen, Arash Bahramian, Jingyi Wang, Michael Bremer, Joe Bright, Piergiorgio Casella, David M Russell, Diego Altamirano, M Cristina Baglio, Tomaso Belloni, Chiara Ceccobello, Stephane Corbel, Maria Diaz Trigo, Dipankar Maitra, Aldrin Gabuya, Elena Gallo, Sebastian Heinz, Jeroen Homan, Erin Kara, Elmar Körding, Fraser Lewis

Abstract:

Black hole (BH) X-ray binaries (XRBs) are ideal targets to study the connection between accretion inflow and jet outflow. Here we present quasi-simultaneous, multiwavelength observations of the Galactic BH system MAXI J1820+070, throughout its 2018–2019 outburst. Our data set includes coverage from the radio through X-ray bands from 17 different instruments/telescopes, and encompasses 19 epochs over a 7 month period, resulting in one of the most well-sampled multiwavelength data sets of a BH XRB outburst to date. With our data, we compile and model the broadband spectra of this source using a phenomenological model that includes emission from the jet, a companion star, and an accretion flow. This modeling allows us to track the evolution of the spectral break in the jet spectrum, a key observable that samples the jet launching region. We find that the spectral break location changes over at least ≈3 orders of magnitude in electromagnetic frequency over this period. Using these spectral break measurements, we link the full cycle of jet behavior, including the rising, quenching, and reignition, to the changing accretion flow properties as the source evolves through its different accretion states. Our analysis shows consistent jet behavior with other sources in similar phases of their outbursts, reinforcing the idea that jet quenching and recovery may be a global feature of BH XRB systems in outburst. Our results also provide valuable evidence supporting a close connection between the geometry of the inner accretion flow and the base of the jet