The First X-Ray Polarization Observation of the Black Hole X-Ray Binary 4U 1630–47 in the Steep Power-law State
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Published:2023-11-01
Issue:1
Volume:958
Page:L8
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ISSN:2041-8205
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Container-title:The Astrophysical Journal Letters
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language:
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Short-container-title:ApJL
Author:
Rodriguez Cavero NicoleORCID, Marra LorenzoORCID, Krawczynski HenricORCID, Dovčiak MichalORCID, Bianchi StefanoORCID, Steiner James F.ORCID, Svoboda JiriORCID, Capitanio FiammaORCID, Matt GiorgioORCID, Negro MichelaORCID, Ingram AdamORCID, Veledina AlexandraORCID, Taverna RobertoORCID, Karas VladimirORCID, Ursini FrancescoORCID, Podgorný JakubORCID, Ratheesh AjayORCID, Suleimanov ValeryORCID, Mikušincová RomanaORCID, Zane SilviaORCID, Kaaret PhilipORCID, Muleri FabioORCID, Poutanen JuriORCID, Malacaria ChristianORCID, Petrucci Pierre-OlivierORCID, Gau EphraimORCID, Hu KunORCID, Chun SoheeORCID, Agudo IvánORCID, Antonelli Lucio A.ORCID, Bachetti MatteoORCID, Baldini LucaORCID, Baumgartner Wayne H.ORCID, Bellazzini RonaldoORCID, Bongiorno Stephen D.ORCID, Bonino RaffaellaORCID, Brez AlessandroORCID, Bucciantini NiccolòORCID, Castellano SimoneORCID, Cavazzuti ElisabettaORCID, Chen Chien-TingORCID, Ciprini StefanoORCID, Costa EnricoORCID, De Rosa AlessandraORCID, Del Monte EttoreORCID, Di Gesu LauraORCID, Di Lalla NiccolòORCID, Di Marco AlessandroORCID, Donnarumma ImmacolataORCID, Doroshenko VictorORCID, Ehlert Steven R.ORCID, Enoto TeruakiORCID, Evangelista YuriORCID, Fabiani SergioORCID, Ferrazzoli RiccardoORCID, García Javier A.ORCID, Gunji ShuichiORCID, Hayashida Kiyoshi, Heyl JeremyORCID, Iwakiri WataruORCID, Jorstad Svetlana G.ORCID, Kislat FabianORCID, Kitaguchi Takao, Kolodziejczak Jeffery J.ORCID, La Monaca FabioORCID, Latronico LucaORCID, Liodakis IoannisORCID, Maldera SimoneORCID, Manfreda AlbertoORCID, Marin FrédéricORCID, Marinucci AndreaORCID, Marscher Alan P.ORCID, Marshall Herman L.ORCID, Massaro FrancescoORCID, Mitsuishi Ikuyuki, Mizuno TsunefumiORCID, Ng Chi-YungORCID, O’Dell Stephen L.ORCID, Omodei NicolaORCID, Oppedisano ChiaraORCID, Papitto AlessandroORCID, Pavlov George G.ORCID, Peirson Abel L.ORCID, Perri MatteoORCID, Pesce-Rollins MelissaORCID, Pilia MauraORCID, Possenti AndreaORCID, Puccetti SimonettaORCID, Ramsey Brian D.ORCID, Rankin JohnORCID, Roberts Oliver J.ORCID, Romani Roger W.ORCID, Sgrò CarmeloORCID, Slane PatrickORCID, Spandre GloriaORCID, Soffitta PaoloORCID, Swartz Douglas A.ORCID, Tamagawa ToruORCID, Tavecchio FabrizioORCID, Tawara Yuzuru, Tennant Allyn F.ORCID, Thomas Nicholas E.ORCID, Tombesi FrancescoORCID, Trois AlessioORCID, Tsygankov Sergey S.ORCID, Turolla RobertoORCID, Vink JaccoORCID, Weisskopf Martin C.ORCID, Wu KinwahORCID, Xie FeiORCID
Abstract
Abstract
The Imaging X-ray Polarimetry Explorer (IXPE) observed the black hole X-ray binary 4U 1630–47 in the steep power-law (or very high) state. The observations reveal a linear polarization degree of the 2–8 keV X-rays of 6.8% ± 0.2% at a position angle of 21.°3 ± 0.°9 east of north (all errors at 1σ confidence level). Whereas the polarization degree increases with energy, the polarization angle stays constant within the accuracy of our measurements. We compare the polarization of the source in the steep power-law state with the previous IXPE measurement of the source in the high soft state. We find that, even though the source flux and spectral shape are significantly different between the high soft state and the steep power-law state, their polarization signatures are similar. Assuming that the polarization of both the thermal and power-law emission components are constant over time, we estimate the power-law component polarization to be 6.8%–7.0% and note that the polarization angle of the thermal and power-law components must be approximately aligned. We discuss the implications for the origin of the power-law component and the properties of the emitting plasma.
Funder
National Aeronautics and Space Administration
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
2 articles.
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