论文标题
Chandra对附近星系的调查：扩展目录
Chandra Survey of Nearby Galaxies: an Extended Catalog
论文作者
论文摘要
她等人。 （纸i）通过在NASA X射线外的星系（NED）在50 MPC和Chandra档案中的NASA X射线星系和Chandra档案中组装了与Chandra X射线观测器观察到的附近星系的目录。该样品已经搜索了与晚期，无块状星系相关的低质量黑洞，并研究了与低毛度性活性银河系核（LLAGNS）相关的增生物理学的研究。使用类似的方法，我们在这里构建了高达150 MPC的扩展目录，并与附近星系组的目录进行互相关。新的目录由1,964个星系组成，其中1,692个具有红移独立距离，在Galaxy组目录中列出了1,557个带有可用组属性的星系，并确定了782个X射线AGN候选者。与论文I中的AGN样本相比，新样本的大小是2.5倍（782 vs. 314），约80％的新成员的爱丁顿比率小于10^-4。我们确认基于先前样本的结论仍然存在。使用新样本，我们比较了早期型和晚期星系之间以及组中央和卫星星系之间的AGN分数，并且没有发现显着差异。这表明世俗过程不是当地宇宙中喂养AGN的主要机制。
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.
