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Lookup NU author(s): Dr Adam IngramORCiD, Melissa Ewing
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024. The Author(s). Published by the American Astronomical Society.We report on an observational campaign on the bright black hole (BH) X-ray binary Swift J1727.8-1613 centered around five observations by the Imaging X-ray Polarimetry Explorer. These observations track for the first time the evolution of the X-ray polarization of a BH X-ray binary across a hard to soft state transition. The 2-8 keV polarization degree decreased from ∼4% to ∼3% across the five observations, but the polarization angle remained oriented in the north-south direction throughout. Based on observations with the Australia Telescope Compact Array, we find that the intrinsic 7.25 GHz radio polarization aligns with the X-ray polarization. Assuming the radio polarization aligns with the jet direction (which can be tested in the future with higher-spatial-resolution images of the jet), our results imply that the X-ray corona is extended in the disk plane, rather than along the jet axis, for the entire hard intermediate state. This in turn implies that the long (≳10 ms) soft lags that we measure with the Neutron star Interior Composition ExploreR are dominated by processes other than pure light-crossing delays. Moreover, we find that the evolution of the soft lag amplitude with spectral state does not follow the trend seen for other sources, implying that Swift J1727.8-1613 is a member of a hitherto undersampled subpopulation.
Author(s): Ingram A, Bollemeijer N, Veledina A, Dovciak M, Poutanen J, Egron E, Russell TD, Trushkin SA, Negro M, Ratheesh A, Capitanio F, Connors R, Neilsen J, Kraus A, Iacolina MN, Pellizzoni A, Pilia M, Carotenuto F, Matt G, Mastroserio G, Kaaret P, Bianchi S, Garcia JA, Bachetti M, Wu K, Costa E, Ewing M, Kravtsov V, Krawczynski H, Loktev V, Marinucci A, Marra L, Mikusincova R, Nathan E, Parra M, Petrucci P-O, Righini S, Soffitta P, Steiner JF, Svoboda J, Tombesi F, Tugliani S, Ursini F, Yang Y-J, Zane S, Zhang W, Agudo I, Antonelli LA, Baldini L, Baumgartner WH, Bellazzini R, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Castellano S, Cavazzuti E, Chen C-T, Ciprini S, De Rosa A, Del Monte E, Di Gesu L, Di Lalla N, Di Marco A, Donnarumma I, Doroshenko V, Ehlert SR, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Gunji S, Hayashida K, Heyl J, Iwakiri W, Jorstad SG, Karas V, Kislat F, Kitaguchi T, Kolodziejczak JJ, La Monaca F, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marscher AP, Marshall HL, Massaro F, Mitsuishi I, Mizuno T, Muleri F, Ng C-Y, O'Dell SL, Omodei N, Oppedisano C, Papitto A, Pavlov GG, Peirson AL, Perri M, Pesce-Rollins M, Possenti A, Puccetti S, Ramsey BD, Rankin J, Roberts OJ, Romani RW, Sgro C, Slane P, Spandre G, Swartz DA, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Trois A, Tsygankov SS, Turolla R, Vink J, Weisskopf MC, Xie F
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal
Year: 2024
Volume: 968
Issue: 2
Print publication date: 20/06/2024
Online publication date: 13/06/2024
Acceptance date: 15/04/2024
Date deposited: 26/06/2024
ISSN (print): 0004-637X
ISSN (electronic): 1538-4357
Publisher: Institute of Physics
URL: https://doi.org/10.3847/1538-4357/ad3faf
DOI: 10.3847/1538-4357/ad3faf
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