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arXiv 2007.06026astro-ph.GA
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Chandra邻近星系巡天:一个扩展星表

Chandra Survey of Nearby Galaxies: an Extended Catalog

Sheng Bi, Hua Feng, Luis C. Ho

摘要:

She et al.(Paper I)汇编了钱德拉X射线天文台观测到的附近星系的目录,通过交叉匹配NASA河外星系数据库(NED)中50 Mpc以内的星系和钱德拉档案。这一样品使人们能够搜寻与晚型无凸起星系有关的低质量黑洞,并研究与低光度活动星系核有关的吸积物理学。使用类似的方法,在这里,我们构建了一个扩展的目录高达150兆秒差距,并与附近的星系群的目录的互相关。新的星表包含1,964个星系,其中1,692个具有与红移无关的距离,1,557个被列入星系群星表中,具有可用的群属性,782个被确定为X射线活动星系核候选者。与论文I中的活动星系核样本相比,新样本的大小是前者的2.5倍(782对314),其中约80%的新成员的爱丁顿比小于10^-4。我们确认基于先前样本的结论仍然存在。利用新的样本,我们比较了早型星系和晚型星系,以及成组的中央星系和卫星星系的活动星系核分数,没有发现显著差异。这表明,长期的过程是不是占主导地位的机制喂养AGN在本地宇宙。

英文摘要:

She et al. (Paper I) assembled a catalog of nearby galaxies observed with the Chandra X-ray observatory, by cross-matching galaxies in the NASA Extragalactic Database (NED) within 50 Mpc and the Chandra archive. That sample has enabled searches of low-mass black holes associated with late-type, bulgeless galaxies and studies of the accretion physics related to low-luminosity active galactic nuclei (LLAGNs). Using a similar approach, here we construct an extended catalog up to 150 Mpc and make a cross-correlation with a catalog of nearby galaxy groups. The new catalog consists of 1,964 galaxies, out of which 1,692 have a redshift independent distance, 1,557 are listed in the galaxy group catalog with group properties available, and 782 are identified to be X-ray AGN candidates. Compared with the AGN sample in Paper I, the new sample is 2.5 times larger in size (782 vs. 314), with ~80% of the new members having an Eddington ratio less than 10^-4. We confirm that the conclusions based on the previous sample remain. With the new sample, we compare AGN fractions between early-type and late-type galaxies, and between central and satellite galaxies in groups, and find no significant difference. This suggests that the secular process is not the dominant mechanism feeding AGNs in the local universe.

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