Effect of richness on AGN and star formation activities in SDSS galaxy groups

Effect of richness on AGN and star formation activities in SDSS galaxy groups
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SDSS 星系群中丰富度对 AGN 和恒星形成活动的影响

DOI:
10.1093/mnras/stz267
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发表时间:
2019-01
影响因子:
4.8
通讯作者:
3 more
3 more
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li;Feng Gu;Yi-Zhou Yuan;Qi-Rong;3 more

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基于SDSS DR 12光谱星系样本中81089个星系群254220个星系的大样本,研究了z10.7 $星系群中活动星系核(AGN)宿主星系和恒星形成星系(SFG)的入射角、形态、环境密度和星星形成性质的径向分布。在较低质量、较大半径的晚型星系中,SFG的平均分数约为AGN的6倍。环境光密度的分布表明活动星系核可能处于相对于SFG更密集的环境中。与成组的SFG相比,成组AGN具有更高的平均恒星质量、更低的平均星星形成速率和更老的平均恒星年龄。
Based on a large sample of 254 220 galaxies in 81 089 groups, which are selected from the spectroscopic galaxy sample of the SDSS DR12, we investigate the radial distribution of incidences, morphologies, environmental densities, and star formation properties of the active galactic nucleus (AGN) host galaxies and star-forming galaxies (SFGs) in the groups at z 10.7$) galaxies, and the mean SFG fraction is about 6 times as that of AGNs in the late-type galaxies with lower masses at larger radius. The distribution of environmental luminosity densities shows that the AGNs are likely to be reside in a denser environment relative to the SFGs. Compared with the SFGs in groups, the group AGNs are found to have a higher mean stellar mass, a lower mean star formation rate, and an older mean stellar age.
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