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arXiv 0906.3517astro-ph.CO
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COSMOS场中z=0.36时1.75 kpc/h分离双AGN

A 1.75 kpc/h Separation Dual AGN at z=0.36 in the COSMOS Field

Julia M. Comerford, Roger L. Griffith, Brian F. Gerke, Michael C. Cooper, Jeffrey A. Newman, Marc Davis, Daniel Stern

摘要:

我们提出了强有力的证据,双活动星系核(AGN)在z=0.36星系COSMOS J100043.15+020637.2。宇宙哈勃太空望远镜(HST)对该星系的成像显示了一个潮汐尾,表明该星系最近经历了合并,以及星系中心附近的两个亮点源。这些来源的光度(来自HST图像)和它们的发射线通量比(来自Keck/DEIMOS狭缝光谱)都表明两者都是AGN,而不是恒星形成区或超新星。来自zCOSMOS、斯隆数字巡天、XMM-牛顿、甚大阵和斯皮策的观测强化了活动星系核活动的证据。利用HST成像,我们测量到两个活动星系核之间的投影空间偏移为1.75 +- 0.03 kpc/h,利用DEIMOS,我们测量到两个活动星系核之间的视线速度偏移为150 +- 40 km/s。综合起来,这些观测结果提供了大量证据,证明COSMOS J100043.15+020637.2是合并残余星系中的双重活动星系核。

英文摘要:

We present strong evidence for dual active galactic nuclei (AGN) in the z=0.36 galaxy COSMOS J100043.15+020637.2. COSMOS Hubble Space Telescope (HST) imaging of the galaxy shows a tidal tail, indicating that the galaxy recently underwent a merger, as well as two bright point sources near the galaxy's center. Both the luminosities of these sources (derived from the HST image) and their emission line flux ratios (derived from Keck/DEIMOS slit spectroscopy) suggest that both are AGN and not star-forming regions or supernovae. Observations from zCOSMOS, Sloan Digital Sky Survey, XMM-Newton, Very Large Array, and Spitzer fortify the evidence for AGN activity. With HST imaging we measure a projected spatial offset between the two AGN of 1.75 +- 0.03 kpc/h, and with DEIMOS we measure a 150 +- 40 km/s line-of-sight velocity offset between the two AGN. Combined, these observations provide substantial evidence that COSMOS J100043.15+020637.2 is a dual AGN in a merger-remnant galaxy.

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