弱磁化中子星X射线二进制GS 1826-238在高柔软状态下的极化特性

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弱磁化中子星X射线二进制GS 1826-238在高柔软状态下的极化特性

Polarization properties of the weakly magnetized neutron star X-ray binary GS 1826-238 in the high soft state

论文作者

Capitanio, Fiamma, Fabiani, Sergio, Gnarini, Andrea, Ursini, Francesco, Ferrigno, Carlo, Matt, Giorgio, Poutanen, Juri, Cocchi, Massimo, Mikusincova, Romana, Farinelli, Ruben, Bianchi, Stefano, Kajava, Jari J. E., Muleri, Fabio, Sanchez-Fernandez, Celia, Soffitta, Paolo, Wu, Kinwah, Agudo, Ivan, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccoló, Castellano, Simone, Cavazzuti, Elisabetta, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolo, Di Marco, Alessandro, Donnarumma, Immacolata, Doroshenko, Victor, Dovciak, Michal, 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, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marin, Fréedèric, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., 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, -Rollins, Melissa Pesce, Petrucci, Pierre-Olivier, Pilia, Maura, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey S., Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Xie, Fei, Zane, Silvia

论文摘要

1221年12月9日，成像X射线极化探索器（IXPE）的启动已打开了X射线天文学的新窗口。我们在这里报告了第一个IXPE观察到弱磁中的中子星GS 1826-238的结果，该恒星于2022年3月29日至31日进行，当时源处于高柔软状态。线性极化度的上限（99.73％置信水平）在IXPE 2-8 KEV能量范围内获得了1.3％。与IXPE同时进行了协调的积分和更好的观察结果。考虑到X射线发射区域的不同几何形状，使用从拟合到宽带光谱获得的光谱参数用作蒙特卡洛模拟的输入。将IXPE上限与这些模拟进行比较，我们可以对GS 1826-238的几何形状和倾斜角度构成约束。

The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826-238, performed on 2022 March 29-31 when the source was in a high soft state. An upper limit (99.73% confidence level) of 1.3% for the linear polarization degree is obtained over the IXPE 2-8 keV energy range. Coordinated INTEGRAL and NICER observations were carried out simultaneously with IXPE. The spectral parameters obtained from the fits to the broad-band spectrum were used as inputs for Monte Carlo simulations considering different possible geometries of the X-ray emitting region. Comparing the IXPE upper limit with these simulations, we can put constraints on the geometry and inclination angle of GS 1826-238.

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