Spectropolarimetry with the Giant Metrewave Radio Telescope at 610 MHz: a case study of two southern compact group fields

Spectropolarimetry with the Giant Metrewave Radio Telescope at 610 MHz: a case study of two southern compact group fields
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使用 610 MHz 巨型米波射电望远镜进行分光偏振测量:两个南方致密群场的案例研究

DOI:
10.1093/mnras/stt2118
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发表时间:
2014
影响因子:
4.8
通讯作者:
Farnes J
Farnes J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Farnes J

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我们展示了来自巨型米波射电望远镜(GMRT)的610 MHz光谱偏振图像。我们详细讨论了GMRT全偏振模式的特性,并提供了仪器偏振性能的技术表征。结果表明,该望远镜可用于宽视场光谱偏振测量。应用旋转测量合成技术,在法拉第空间获得了几十μJy的灵敏度。为了展示该仪器的能力,我们展示了对两个南方致密星系群的观测结果——Grus四重奏和USCG S063。将观测结果与其他射电和红外数据进行比较,以约束组成员的光谱指数、极化分数和法拉第深度。在Grus四重奏中的所有四个星系和USCG S063中的一个星系中都检测到了射电连续辐射。在Grus四重奏场的背景下,从NGC 7552的环核星暴环、NGC 7582的活动核和三个扩展的射电星系中检测到线偏振。根据这些背景源,可以将Fanaroff-Riley I型和x型射电星系分类。在任何星系群中都没有发现与群内介质相互作用的证据。
We present 610 MHz spectropolarimetric images from the Giant Metrewave Radio Telescope (GMRT). We discuss the properties of the GMRT's full-polarization mode in detail and provide a technical characterization of the instrument's polarization performance. We show that the telescope can be used for wide-field spectropolarimetry. The application of Rotation Measure Synthesis results in a sensitivity at the level of tens of μJy in Faraday space. As a demonstration of the instrument's capabilities, we present observations of two southern compact groups – the Grus Quartet and USCG S063. The observations are compared with other radio and infrared data to constrain the group members’ spectral index, polarization fraction and Faraday depth. Radio continuum emission is detected from all four galaxies in the Grus Quartet and one galaxy in USCG S063. Linear polarization is detected from a circumnuclear starburst ring in NGC 7552, the active nucleus of NGC 7582, and three extended radio galaxies in the background of the Grus Quartet field. These background sources allow for the classification of a Fanaroff–Riley type I and an X-shaped radio galaxy. No evidence is found for interaction with the intragroup medium in either galaxy group.
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