用成像X射线极化探索器绘制Circinus Galaxy的环形区域

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用成像X射线极化探索器绘制Circinus Galaxy的环形区域

Mapping the circumnuclear regions of the Circinus galaxy with the Imaging X-ray Polarimetry Explorer

论文作者

Ursini, F., Marinucci, A., Matt, G., Bianchi, S., Marin, F., Marshall, H. L., Middei, R., Poutanen, J., Rogantini, D., De Rosa, A., Di Gesu, L., García, J. A., Ingram, A., Kim, D. E., Krawczynski, H., Puccetti, S., Soffitta, P., Svoboda, J., Tombesi, F., Weisskopf, M. C., Barnouin, T., Perri, M., Podgorny, J., Ratheesh, A., Zaino, A., Agudo, I., Antonelli, L. A., Bachetti, M., Baldini, L., Baumgartner, W. H., Bellazzini, R., Bongiorno, S. D., Bonino, R., Brez, A., Bucciantini, N., Capitanio, F., Castellano, S., Cavazzuti, E., Ciprini, S., Costa, E., Del Monte, E., Di Lalla, N., Di Marco, A., Donnarumma, I., Doroshenko, V., Dovčiak, M., Ehlert, S. R., Enoto, T., Evangelista, Y., Fabiani, S., Ferrazzoli, R., Gunji, S., Heyl, J., Iwakiri, W., Jorstad, S. G., Karas, V., Kitaguchi, T., Kolodziejczak, J. J., La Monaca, F., Latronico, L., Liodakis, I., Maldera, S., Manfreda, A., Marscher, A. P., Mitsuishi, I., Mizuno, T., Muleri, F., Ng, C. Y., O'Dell, S. L., Omodei, N., Oppedisano, C., Papitto, A., Pavlov, G. G., Peirson, A. L., Pesce-Rollins, M., Petrucci, P. -O., Pilia, M., Possenti, A., Ramsey, B. D., Rankin, J., Romani, R. W., Sgrò, C., Slane, P., Spandre, G., Tamagawa, T., Tavecchio, F., Taverna, R., Tawara, Y., Tennant, A. F., Thomas, N. E., Trois, A., Tsygankov, S. S., Turolla, R., Vink, J., Wu, K., Xie, F., Zane, S.

论文摘要

我们报告了X射线极化探索器（IXPE）对最接近和X射线最亮的Compton-Thick-thick活性银河核（AGN），Circinus Galaxy的观察。我们发现在2--6 KEV频段中的来源显着极化。从以前的研究中，已知X射线光谱由中性（圆环）和电离（电离锥）的反射成分主导。我们的分析表明，中性反射器的极化度为$ 28 \ pm 7 $ 7 $（以68％的置信度），极化角度为$ 18°\ pm 5°$，大致垂直于无线电飞机。电离反射的极化是不受限制的。与蒙特卡洛对圆环预期的极化的比较表明，中性反射器与是赤道的赤道一致，其半开角度为45°-55°。这是Seyfert星系中的第一个X射线极化检测，它证明了X射线极化法在探测AGNS的几何形状方面的力量，并证实了标准统一模型的基本预测。

We report on the Imaging X-ray Polarimetry Explorer (IXPE) observation of the closest and X-ray brightest Compton-thick active galactic nucleus (AGN), the Circinus galaxy. We find the source to be significantly polarized in the 2--6 keV band. From previous studies, the X-ray spectrum is known to be dominated by reflection components, both neutral (torus) and ionized (ionization cones). Our analysis indicates that the polarization degree is $28 \pm 7$ per cent (at 68 per cent confidence level) for the neutral reflector, with a polarization angle of $18° \pm 5°$, roughly perpendicular to the radio jet. The polarization of the ionized reflection is unconstrained. A comparison with Monte Carlo simulations of the polarization expected from the torus shows that the neutral reflector is consistent with being an equatorial torus with a half-opening angle of 45°-55°. This is the first X-ray polarization detection in a Seyfert galaxy, demonstrating the power of X-ray polarimetry in probing the geometry of the circumnuclear regions of AGNs, and confirming the basic predictions of standard Unification Models.

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