IXPE and XMM-Newton Observations of the Soft Gamma Repeater SGR 1806-20

DOI: 
10.3847/1538-4357/aced05
Publication date: 
11/09/2023
Main author: 
Turolla, Roberto
IAA authors: 
Agudo, Iván
Authors: 
Turolla, Roberto;Taverna, Roberto;Israel, Gian Luca;Muleri, Fabio;Zane, Silvia;Bachetti, Matteo;Heyl, Jeremy;Di Marco, Alessandro;Gau, Ephraim;Krawczynski, Henric;Ng, Mason;Possenti, Andrea;Poutanen, Juri;Baldini, Luca;Matt, Giorgio;Negro, Michela;Agudo, Iván;Antonelli, Lucio A.;Baumgartner, Wayne H.;Bellazzini, Ronaldo;Bianchi, Stefano;Bongiorno, Stephen D.;Bonino, Raffaella;Brez, Alessandro;Bucciantini, Niccolò;Capitanio, Fiamma;Castellano, Simone;Cavazzuti, Elisabetta;Chen, Chieng-Ting;Ciprini, Stefano;Costa, Enrico;De Rosa, Alessandra;Del Monte, Ettore;Di Gesu, Laura;Di Lalla, Niccolò;Donnarumma, Immacolata;Doroshenko, Victor;Dovčiak, Michal;Ehlert, Steven R.;Enoto, Teruaki;Evangelista, Yuri;Fabiani, Sergio;Ferrazzoli, Riccardo;Garcia, Javier A.;Gunji, Shuichi;Hayashida, Kiyoshi;Iwakiri, Wataru;Jorstad, Svetlana G.;Kaaret, Philip;Karas, Vladimir;Kislat, Fabian;Kitaguchi, Takao;Kolodziejczak, Jeffery J.;La Monaca, Fabio;Latronico, Luca;Liodakis, Ioannis;Maldera, Simone;Manfreda, Alberto;Marin, Frédéric;Marinucci, Andrea;Marscher, Alan P.;Marshall, Herman L.;Massaro, Francesco;Mitsuishi, Ikuyuki;Mizuno, Tsunefumi;Ng, C. -Y.;O'Dell, Stephen L.;Omodei, Nicola;Oppedisano, Chiara;Papitto, Alessandro;Pavlov, George G.;Peirson, Abel L.;Perri, Matteo;Pesce-Rollins, Melissa;Petrucci, Pierre-Olivier;Pilia, Maura;Puccetti, Simonetta;Ramsey, Brian D.;Rankin, John;Ratheesh, Ajay;Roberts, Oliver J.;Romani, Roger W.;Sgró, Carmelo;Slane, Patrick;Soffitta, Paolo;Spandre, Gloria;Swartz, Douglas A.;Tamagawa, Toru;Tavecchio, Fabrizio;Tawara, Yuzuru;Tennant, Allyn F.;Thomas, Nicholas E.;Tombesi, Francesco;Trois, Alessio;Tsygankov, Sergey S.;Vink, Jacco;Weisskopf, Martin C.;Wu, Kinwah;Xie, Fei
Journal: 
The Astrophysical Journal
Publication type: 
Article
Volume: 
954
Pages: 
88
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.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2023ApJ...954...88T/abstract
ADS Bibcode: 
2023ApJ...954...88T
Keywords: 
Neutron stars;Magnetars;Polarimetry;X-ray sources;1108;992;1278;1822;Astrophysics - High Energy Astrophysical Phenomena;Astrophysics - Instrumentation and Methods for Astrophysics