论文标题

X射线极化观测值

X-ray Polarization Observations of BL Lacertae

论文作者

Middei, Riccardo, Liodakis, Ioannis, Perri, Matteo, Puccetti, Simonetta, Cavazzuti, Elisabetta, Di Gesu, Laura, Ehlert, Steven R., Madejski, Grzegorz, Marscher, Alan P., Marshall, Herman L., Muleri, Fabio, Negro, Michela, Jorstad, Svetlana G., Agís-González, Beatriz, Agudo, Iván, Bonnoli, Giacomo, Bernardos, Maria I., Casanova, Víctor, García-Comas, Maya, Husillos, César, Marchini, Alessandro, Sota, Alfredo, Kouch, Pouya M., Borman, George A., Kopatskaya, Evgenia N., Larionova, Elena G., Morozova, Daria A., Savchenko, Sergey S., Vasilyev, Andrey A., Zhovtan, Alexey V., Casadio, Carolina, Escudero, Juan, Myserlis, Ioannis, Hales, Antonio, Kameno, Seiji, Kneissl, Ruediger, Messias, Hugo, Nagai, Hiroshi, Blinov, Dmitry, Bourbah, Ioakeim G., Kiehlmann, Sebastian, Kontopodis, Evangelos, Mandarakas, Nikos, Romanopoulos, Stylianos, Skalidis, Raphael, Vervelaki, Anna, Masiero, Joseph R., Mawet, Dimitri, Millar-Blanchaer, Maxwell A., Panopoulou, Georgia V., Tinyanont, Samaporn, Berdyugin, Andrei V., Kagitani, Masato, Kravtsov, Vadim, Sakanoi, Takeshi, Imazawa, Ryo, Sasada, Mahito, Fukazawa, Yasushi, Kawabata, Koji S., Uemura, Makoto, Mizuno, Tsunefumi, Nakaoka, Tatsuya, Akitaya, Hiroshi, Gurwell, Mark, Rao, Ramprasad, Di Lalla, Niccoló, Cibrario, Nicoló, Donnarumma, Immacolata, Kim, Dawoon E., Omodei, Nicola, Pacciani, Luigi, Poutanen, Juri, Tavecchio, Fabrizio, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccoló, Capitanio, Fiamma, Castellano, Simone, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Marco, Alessandro, Doroshenko, Victor, Dovčiak, Michal, Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Karas, Vladimir, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marinucci, Andrea, Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Ng, C. -Y., O'Dell, Stephen L., Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Pilia, Maura, Possenti, Andrea, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Romani, Roger W., Sgró, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Tamagawa, Toru, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey, Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Wu, Kinwah, Xie, Fei, Zane, Silvia

论文摘要

Blazars是一类具有典型双重光谱能量分布的喷射为主的活性银核。与低频峰负责的同步加速器发射是常见共识,而高频驼峰的起源仍在争论中。 X射线及其两极化的分析可以提供一个有价值的工具,以了解负责大黄体高能排放起源的物理机制。我们报告了使用成像X射线极化探索器({ixpe})进行的Bl lacertae的首次观察,从中在2-8 keV频段中可以找到上极限$π_x<$ 12.6 \%。我们同时测量了无线电,红外和光波长中的极化。我们的多波长极化分析分析了质子同步子辐射对这些时期下X射线发射的显着贡献。取而代之的是,它支持BL LAC中X射线发射的Leptonic来源。

Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus the Synchrotron emission to be responsible for the low frequency peak, while the origin of the high frequency hump is still debated. The analysis of X-rays and their polarization can provide a valuable tool to understand the physical mechanisms responsible for the origin of high-energy emission of blazars. We report the first observations of BL Lacertae performed with the Imaging X-ray Polarimetry Explorer ({IXPE}), from which an upper limit to the polarization degree $Π_X<$12.6\% was found in the 2-8 keV band. We contemporaneously measured the polarization in radio, infrared, and optical wavelengths. Our multiwavelength polarization analysis disfavors a significant contribution of proton synchrotron radiation to the X-ray emission at these epochs. Instead, it supports a leptonic origin for the X-ray emission in BL Lac.

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