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

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

Journal
THE ASTROPHYSICAL JOURNAL LETTERS  
Date Issued
2023
Author(s)
DI MARCO, Alessandro  
•
LA MONACA, Fabio  
•
Poutanen, Juri
•
Russell, Thomas D.
•
ANITRA, Alessio  
•
FARINELLI, Ruben  
•
MASTROSERIO, Guglielmo  
•
MULERI, FABIO  
•
XIE, FEI  
•
BACHETTI, Matteo  
•
BURDERI, LUCIANO  
•
RATHEESH, AJAY  
•
Roberts, Oliver J.
•
Romani, Roger W.
•
Sgrò, Carmelo
•
Slane, Patrick
•
Spandre, Gloria
•
Swartz, Douglas A.
•
Tamagawa, Toru
•
TAVECCHIO, Fabrizio  
•
Taverna, Roberto
•
CAROTENUTO, Francesco  
•
Tawara, Yuzuru
•
Tennant, Allyn F.
•
Thomas, Nicholas E.
•
TOMBESI, Francesco  
•
TROIS, ALESSIO  
•
Tsygankov, Sergey S.
•
Turolla, Roberto
•
Vink, Jacco
•
Wu, Kinwah
•
DEL SANTO, MELANIA  
•
Di Salvo, Tiziana
•
Dovčiak, Michal
•
Gnarini, Andrea
•
Iaria, Rosario  
•
Kajava, Jari J. E.
•
Liu, Kuan
•
MIDDEI, Riccardo  
•
O’Dell, Stephen L.
•
PILIA, Maura  
•
RANKIN, John  
•
SANNA, ANDREA  
•
Eijnden, Jakob van den
•
Weisskopf, Martin C.
•
Bobrikova, Anna
•
CAPITANIO, FIAMMA  
•
COSTA, ENRICO  
•
Kaaret, Philip
•
MARINO, ALESSIO  
•
SOFFITTA, PAOLO  
•
Ursini, Francesco  
•
AMBROSINO, Filippo  
•
COCCHI, Massimo  
•
FABIANI, Sergio  
•
Marshall, Herman L.
•
Matt, Giorgio  
•
MOTTA, Sara Elisa  
•
PAPITTO, ALESSANDRO  
•
STELLA, Luigi  
•
TARANA, Antonella  
•
Zane, Silvia
•
Agudo, Iván
•
ANTONELLI, Lucio Angelo  
•
Baldini, Luca
•
Baumgartner, Wayne H.
•
Bellazzini, Ronaldo
•
Bianchi, Stefano
•
Bongiorno, Stephen D.
•
Bonino, Raffaella
•
Brez, Alessandro
•
BUCCIANTINI, Niccolo'  
•
Castellano, Simone
•
Cavazzuti, Elisabetta
•
Chen, Chien-Ting
•
Ciprini, Stefano
•
DE ROSA, Alessandra  
•
DEL MONTE, Ettore  
•
Di Gesu, Laura
•
Di Lalla, Niccolò
•
Donnarumma, Immacolata
•
Doroshenko, Victor
•
Ehlert, Steven R.
•
Enoto, Teruaki
•
EVANGELISTA, YURI  
•
FERRAZZOLI, RICCARDO  
•
Garcia, Javier A.
•
Gunji, Shuichi
•
Hayashida, Kiyoshi
•
Heyl, Jeremy
•
Iwakiri, Wataru
•
Jorstad, Svetlana G.
•
Karas, Vladimir
•
Kislat, Fabian
•
Kitaguchi, Takao
•
Kolodziejczak, Jeffery J.
•
Krawczynski, Henric
•
Latronico, Luca
•
Liodakis, Ioannis
•
Maldera, Simone
•
Manfreda, Alberto
•
Marin, Frédéric
•
Marinucci, Andrea
•
Marscher, Alan P.
•
MASSARO, Francesco  
•
Mitsuishi, Ikuyuki
•
Mizuno, Tsunefumi
•
Negro, Michela
•
Ng, Chi-Yung
•
Omodei, Nicola
•
Oppedisano, Chiara
•
Pavlov, George G.
•
Peirson, Abel L.
•
PERRI, Matteo  
•
Pesce-Rollins, Melissa
•
Petrucci, Pierre-Olivier
•
POSSENTI, ANDREA  
•
Puccetti, Simonetta
•
Ramsey, Brian D.
DOI
10.3847/2041-8213/acec6e
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.
Volume
953
Issue
2
Start page
L22
Uri
http://hdl.handle.net/20.500.12386/34532
Url
https://iopscience.iop.org/article/10.3847/2041-8213/acec6e
https://api.elsevier.com/content/abstract/scopus_id/85169325138
Issn Identifier
2041-8205
Ads BibCode
2023ApJ...953L..22D
Rights
open.access
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