Signatures of multiple episodes of AGN activity in the core of Abell 1795
Signatures of multiple episodes of AGN activity in the core of Abell 1795
复制标题
Abell 1795 核心多次 AGN 活动的特征
DOI：
10.1051/0004-6361/201833222
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发表时间：
2018
影响因子：
6.5
通讯作者：
H. Intema
中科院分区：
文献类型：
--
作者：
G. Kokotanekov;M. Wise;M. D. Vries;H. Intema
在本文中，我们分析活动星系核活动的丰富的附近星系团阿贝尔1795旨在确认和描述系统的长期反馈历史的签名。我们结合联合收割机无线电观测在610和235兆赫的巨型米波射电望远镜（GMRT）与3.4兆秒的X射线数据从钱德拉天文台。提取径向温度分布，以及X射线和无线电表面亮度分布在三个方向上显示主要的形态干扰，我们突出了系统中的活动的签名。我们首次观测到对应于NW X射线低压的射电辐射，这为将低压归类为空洞提供了证据。我们确定了另外两个位于西北和西南的活动星系核的X射线腔。虽然对应于内腔的中心射电发射显示出较平坦的光谱指数，但与最远的X射线腔相关的射电扩展由老化的等离子体组成。所有观察到的签名都在无线电和X射线是一致的活动星系核的活动，这引起了观察到的形态从核心的NW和SW的几个连续事件。在南部地区，我们证实了冷却尾流假说的起源长尾。深层X射线数据还使我们能够区分尾部内部的显著扭曲，我们将其归因于活动星系核的活动。
In this paper we analyze AGN activity signatures in the rich nearby galaxy cluster Abell 1795 aiming to confirm and characterize the long-term feedback history in the system. We combine radio observations at 610 and 235 MHz from the Giant Metrewave Radio Telescope (GMRT) with 3.4 Msec X-ray data from the Chandra Observatory. Extracting radial temperature profiles, as well as X-ray and radio surface brightness profiles in three directions showing major morphological disturbances, we highlight the signatures of activity in the system. For the first time we observe radio emission corresponding to the NW X-ray depression, which provides evidence in favor of the classification of the depression as a cavity. We identify two other X-ray cavities situated NW and SW of the AGN. While the central radio emission corresponding to the inner cavities shows a flatter spectral index, the radio extensions associated with the farthest X-ray cavities consist of aged plasma. All observed signatures both in radio and X-ray are consistent with several consecutive episodes of AGN activity, which gave rise to the observed morphology NW and SW from the core. In the southern region, we confirm the cooling wake hypothesis for the origin of the long tail. The deep X-ray data also allows us to distinguish significant distortions in the tail’s inner parts, which we attribute to the activity of the AGN.
影响因子：
6.5
作者：
de Gasperin, F.;Orru, E.;Zarka, P.
通讯作者：
Zarka, P.