在COSMOS场中从深VLA数据对潜在反冲黑洞CID-42的新认识
New insights from deep VLA data on the potentially recoiling black hole CID-42 in the COSMOS field
摘要：
我们提出了深3 GHz的VLA观测的潜在反冲黑洞CID-42在COSMOS领域。这个星系在HST/ACS图像中显示了两个光学核，并且在宽和窄的H β发射线之间存在约1300 km/s的大速度偏移，尽管光谱不是空间分辨的（Civano等人，2010）。新的3 GHz VLA数据具有2 GHz的带宽，并且为了正确地解释通量密度成像，使用两种不同的方法进行：多尺度多频率合成和谱窗叠加。这些图的最终分辨率和灵敏度分别为0.7”（rms = 4.6 μ Jy/束）和0.9”（rms = 4.8 μ Jy/束）。通过7 σ检测，我们发现整个观察到的3 GHz无线电发射可以与CID-42的东南分量相关联，与检测到的X射线发射一致。我们使用我们的3 GHz的数据结合其他无线电数据从文献中，从320 MHz到9 GHz，其中包括VLA，VLBA和GMRT数据，构建CID-42的无线电同步辐射谱。射电频谱表明，在东南分量的I型无遮蔽的无线电安静的平谱活动星系核，它可能被一个更广泛的区域所包围的旧同步电子人口或冲击所产生的流出从超大质量黑洞。我们的数据是一致的反冲黑洞图片，但不能排除存在一个模糊的和无线电安静的SMBH在西北部的组成部分。
英文摘要：
We present deep 3 GHz VLA observations of the potentially recoiling black hole CID-42 in the COSMOS field. This galaxy shows two optical nuclei in the HST/ACS image and a large velocity offset of ~ 1300 km/s between the broad and narrow H beta emission line although the spectrum is not spacially resolved (Civano et al. 2010). The new 3 GHz VLA data has a bandwidth of 2 GHz and to correctly interpret the flux densities imaging was done with two different methods: multi-scale multi-frequency synthesis and spectral windows stacking. The final resolutions and sensitivities of these maps are 0.7" with rms = 4.6 muJy/beam and 0.9" with rms = 4.8 muJy/beam respectively. With a 7 sigma detection we find that the entire observed 3 GHz radio emission can be associated with the South-Eastern component of CID-42, coincident with the detected X-ray emission. We use our 3 GHz data combined with other radio data from the literature ranging from 320 MHz to 9 GHz, which include the VLA, VLBA and GMRT data, to construct a radio synchrotron spectrum of CID-42. The radio spectrum suggests a type I unobscured radio-quiet flat-spectrum AGN in the South-Eastern component which may be surrounded by a more extended region of old synchrotron electron population or shocks generated by the outflow from the supermassive black hole. Our data are consistent with the recoiling black hole picture but cannot rule out the presence of an obscured and radio-quiet SMBH in the North-Western component.
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