IXPE and XMM-Newton Observations of the Soft Gamma Repeater SGR 1806-20
Journal
Date Issued
2023
Author(s)
Turolla, Roberto
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Taverna, Roberto
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Zane, Silvia
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Heyl, Jeremy
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Gau, Ephraim
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Krawczynski, Henric
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Ng, Mason
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Poutanen, Juri
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Baldini, Luca
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Negro, Michela
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Agudo, Iván
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Baumgartner, Wayne H.
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Bellazzini, Ronaldo
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Bianchi, Stefano
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Bongiorno, Stephen D.
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Bonino, Raffaella
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Brez, Alessandro
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Castellano, Simone
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Cavazzuti, Elisabetta
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Chen, Chieng-Ting
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Ciprini, Stefano
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Di Gesu, Laura
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Di Lalla, Niccolò
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Donnarumma, Immacolata
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Doroshenko, Victor
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Dovčiak, Michal
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Ehlert, Steven R.
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Enoto, Teruaki
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Garcia, Javier A.
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Gunji, Shuichi
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Hayashida, Kiyoshi
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Iwakiri, Wataru
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Jorstad, Svetlana G.
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Kaaret, Philip
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Karas, Vladimir
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Kislat, Fabian
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Kitaguchi, Takao
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Kolodziejczak, Jeffery J.
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Latronico, Luca
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Liodakis, Ioannis
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Maldera, Simone
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Manfreda, Alberto
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Marin, Frédéric
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Marinucci, Andrea
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Marscher, Alan P.
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Marshall, Herman L.
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Mitsuishi, Ikuyuki
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Mizuno, Tsunefumi
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Ng, C. -Y.
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O'Dell, Stephen L.
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Omodei, Nicola
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Oppedisano, Chiara
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Pavlov, George G.
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Peirson, Abel L.
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Pesce-Rollins, Melissa
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Petrucci, Pierre-Olivier
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Puccetti, Simonetta
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Ramsey, Brian D.
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Roberts, Oliver J.
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Romani, Roger W.
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Sgró, Carmelo
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Slane, Patrick
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Spandre, Gloria
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Swartz, Douglas A.
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Tamagawa, Toru
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Tawara, Yuzuru
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Tennant, Allyn F.
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Thomas, Nicholas E.
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Tsygankov, Sergey S.
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Vink, Jacco
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Weisskopf, Martin C.
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Wu, Kinwah
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Abstract
Recent observations with the Imaging X-ray Polarimetry Explorer (IXPE) of two anomalous X-ray pulsars provided evidence that X-ray emission from magnetar sources is strongly polarized. Here we report on the joint IXPE and XMM-Newton observations of the soft γ-repeater SGR 1806-20. The spectral and timing properties of SGR 1806-20 derived from XMM-Newton data are in broad agreement with previous measurements; however, we found the source at an all-time low persistent flux level. No significant polarization was measured apart from the 4-5 keV energy range, where a probable detection with PD = 31.6% ± 10.5% and $\mathrm{PA}=-17\buildrel{\circ}\over{.} {6}_{-15\buildrel{\circ}\over{.} 0}^{+15\buildrel{\circ}\over{.} 5}$ was obtained. The resulting polarization signal, together with the upper limits we derive at lower and higher energies (2-4 and 5-8 keV, respectively), is compatible with a picture in which thermal radiation from the condensed star surface is reprocessed by resonant Compton scattering in the magnetosphere, similar to what was proposed for the bright magnetar 4U 0142+61.
Volume
954
Issue
1
Start page
88
Issn Identifier
0004-637X
Ads BibCode
2023ApJ...954...88T
Rights
open.access
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