First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303-Reference-Cited by-同舟云学术

First Detection of X-Ray Polarization from the Accreting Neutron Star 4U 1820−303

Published:2023-08-01 Issue:2 Volume:953 Page:L22
ISSN:2041-8205
Container-title:The Astrophysical Journal Letters
language:
Short-container-title:ApJL

Author:

Di Marco Alessandro^ORCID,La Monaca Fabio^ORCID,Poutanen Juri^ORCID,Russell Thomas D.^ORCID,Anitra Alessio^ORCID,Farinelli Ruben^ORCID,Mastroserio Guglielmo^ORCID,Muleri Fabio^ORCID,Xie Fei^ORCID,Bachetti Matteo^ORCID,Burderi Luciano^ORCID,Carotenuto Francesco^ORCID,Del Santo Melania^ORCID,Di Salvo Tiziana^ORCID,Dovčiak Michal^ORCID,Gnarini Andrea^ORCID,Iaria Rosario^ORCID,Kajava Jari J. E.^ORCID,Liu Kuan^ORCID,Middei Riccardo^ORCID,O’Dell Stephen L.^ORCID,Pilia Maura^ORCID,Rankin John^ORCID,Sanna Andrea^ORCID,Eijnden Jakob van den^ORCID,Weisskopf Martin C.^ORCID,Bobrikova Anna,Capitanio Fiamma^ORCID,Costa Enrico^ORCID,Kaaret Philip^ORCID,Marino Alessio^ORCID,Soffitta Paolo^ORCID,Ursini Francesco^ORCID,Ambrosino Filippo^ORCID,Cocchi Massimo^ORCID,Fabiani Sergio^ORCID,Marshall Herman L.^ORCID,Matt Giorgio^ORCID,Motta Sara Elisa^ORCID,Papitto Alessandro^ORCID,Stella Luigi^ORCID,Tarana Antonella,Zane Silvia^ORCID,Agudo Iván^ORCID,Antonelli Lucio A.^ORCID,Baldini Luca^ORCID,Baumgartner Wayne H.^ORCID,Bellazzini Ronaldo^ORCID,Bianchi Stefano^ORCID,Bongiorno Stephen D.^ORCID,Bonino Raffaella^ORCID,Brez Alessandro^ORCID,Bucciantini Niccolò^ORCID,Castellano Simone^ORCID,Cavazzuti Elisabetta^ORCID,Chen Chien-Ting^ORCID,Ciprini Stefano^ORCID,De Rosa Alessandra^ORCID,Del Monte Ettore^ORCID,Di Gesu Laura^ORCID,Di Lalla Niccolò^ORCID,Donnarumma Immacolata^ORCID,Doroshenko Victor^ORCID,Ehlert Steven R.^ORCID,Enoto Teruaki^ORCID,Evangelista Yuri^ORCID,Ferrazzoli Riccardo^ORCID,Garcia Javier A.^ORCID,Gunji Shuichi^ORCID,Hayashida Kiyoshi,Heyl Jeremy^ORCID,Iwakiri Wataru^ORCID,Jorstad Svetlana G.^ORCID,Karas Vladimir^ORCID,Kislat Fabian^ORCID,Kitaguchi Takao,Kolodziejczak Jeffery J.^ORCID,Krawczynski Henric^ORCID,Latronico Luca^ORCID,Liodakis Ioannis^ORCID,Maldera Simone^ORCID,Manfreda Alberto^ORCID,Marin Frédéric^ORCID,Marinucci Andrea^ORCID,Marscher Alan P.^ORCID,Massaro Francesco^ORCID,Mitsuishi Ikuyuki,Mizuno Tsunefumi^ORCID,Negro Michela^ORCID,Ng Chi-Yung^ORCID,Omodei Nicola^ORCID,Oppedisano Chiara^ORCID,Pavlov George G.^ORCID,Peirson Abel L.^ORCID,Perri Matteo^ORCID,Pesce-Rollins Melissa^ORCID,Petrucci Pierre-Olivier^ORCID,Possenti Andrea^ORCID,Puccetti Simonetta^ORCID,Ramsey Brian D.^ORCID,Ratheesh Ajay^ORCID,Roberts Oliver J.^ORCID,Romani Roger W.^ORCID,Sgrò Carmelo^ORCID,Slane Patrick^ORCID,Spandre Gloria^ORCID,Swartz Douglas A.^ORCID,Tamagawa Toru^ORCID,Tavecchio Fabrizio^ORCID,Taverna Roberto^ORCID,Tawara Yuzuru,Tennant Allyn F.^ORCID,Thomas Nicholas E.^ORCID,Tombesi Francesco^ORCID,Trois Alessio^ORCID,Tsygankov Sergey S.^ORCID,Turolla Roberto^ORCID,Vink Jacco^ORCID,Wu Kinwah^ORCID,

Abstract

Abstract This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820−303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820−303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% ± 0.5% and a polarization angle of −55° ± 7° in the 4–7 keV energy range, and a polarization degree of 10% ± 2% and a polarization angle of −67° ± 7° in the 7–8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of ≃90° at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3σ upper limit of 50% at 7.25 GHz.

Funder

Agenzia Spaziale Italiana

Academy of Finland

DAAD ∣ German Academic Exchange Service London

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://iopscience.iop.org/article/10.3847/2041-8213/acec6e/pdf

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