ACTIVE GALACTIC NUCLEUS HOST GALAXY MORPHOLOGIES IN COSMOS
ACTIVE GALACTIC NUCLEUS HOST GALAXY MORPHOLOGIES IN COSMOS
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DOI：
10.1088/0004-637x/691/1/705
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发表时间：
2009-01
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通讯作者：
J. Gabor;C. Impey;K. Jahnke;Brooke Simmons;J. Trump;A. Koekemoer;M. Brusa;N. Cappelluti;E. Schinnerer;V. Smolčić;M. Salvato;J. Rhodes;B. Mobasher;P. Capak;R. Massey;A. Leauthaud;N. Scoville
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作者：
J. Gabor;C. Impey;K. Jahnke;Brooke Simmons;J. Trump;A. Koekemoer;M. Brusa;N. Cappelluti;E. Schinnerer;V. Smolčić;M. Salvato;J. Rhodes;B. Mobasher;P. Capak;R. Massey;A. Leauthaud;N. Scoville
我们使用哈勃空间望远镜/高级巡天照相机的图像和宇宙演化巡天（COSMOS）场的测光表来分析红移为0.3 < z < 1.0的400个活动星系核（AGN）候选者的宿主星系的形态。我们比较了活动星系核主机与非活动星系从宇宙领域的样本，以匹配的幅度和红移分布的活动星系核主机。我们进行二维表面亮度建模与GALFIT产生主机星系和核点源的幅度。X射线选择的活动星系核宿主星系的形态跨越了相当大的范围，峰值之间的早期型，隆起为主和晚期型，磁盘为主的系统。我们还测量了宿主星系的不对称性和浓度。未考虑到，核点源可以显着偏差的结果，这些测量的结构参数，所以我们减去最佳拟合点源组件，以获得图像的基础主机星系。我们的浓度测量结果加强了我们的二维形态适合，放置X射线活动星系核主机之间的早期和晚期类型的不活跃星系。活动星系核宿主的不对称性分布与控制星系一致。再加上活动星系核周围缺乏多余的伴星系，这种不对称分布表明活动星系核之间的强相互作用并不比正常星系普遍。根据最近的工作，这些结果表明，在这些X射线光度的活动星系核的宿主星系可能是在一个过渡，从磁盘为主的膨胀为主，但这种过渡通常不是由重大合并触发。
We use Hubble Space Telescope/Advanced Camera for Surveys images and a photometric catalog of the Cosmic Evolution Survey (COSMOS) field to analyze morphologies of the host galaxies of ∼400 active galactic nucleus (AGN) candidates at redshifts 0.3 < z < 1.0. We compare the AGN hosts with a sample of nonactive galaxies drawn from the COSMOS field to match the magnitude and redshift distribution of the AGN hosts. We perform two-dimensional surface brightness modeling with GALFIT to yield host galaxy and nuclear point source magnitudes. X-ray-selected AGN host galaxy morphologies span a substantial range that peaks between those of early-type, bulge-dominated and late-type, disk-dominated systems. We also measure the asymmetry and concentration of the host galaxies. Unaccounted for, the nuclear point source can significantly bias results of these measured structural parameters, so we subtract the best-fit point source component to obtain images of the underlying host galaxies. Our concentration measurements reinforce the findings of our two-dimensional morphology fits, placing X-ray AGN hosts between early- and late-type inactive galaxies. AGN host asymmetry distributions are consistent with those of control galaxies. Combined with a lack of excess companion galaxies around AGN, the asymmetry distributions indicate that strong interactions are no more prevalent among AGN than normal galaxies. In light of recent work, these results suggest that the host galaxies of AGN at these X-ray luminosities may be in a transition from disk-dominated to bulge-dominated, but that this transition is not typically triggered by major mergers.