Colors of AGN host galaxies at 0.5
Colors of AGN host galaxies at 0.5
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DOI：
10.1086/423234
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
S. F. Sanchez;K. Jahnke;L. Wisotzki;D. H. McIntosh;E. F. Bell;M. Barden;Svw V. W. Beckwith;A. Borch;J. Caldwell;B. Haeussler;B. Häußler;S. Jogee;K. Meisenheimer;C. Y. Peng;H. Rix;R. S. Somerville;C. Wolf
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文献类型：
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作者：
S. F. Sanchez;K. Jahnke;L. Wisotzki;D. H. McIntosh;E. F. Bell;M. Barden;Svw V. W. Beckwith;A. Borch;J. Caldwell;B. Haeussler;B. Häußler;S. Jogee;K. Meisenheimer;C. Y. Peng;H. Rix;R. S. Somerville;C. Wolf
本文给出了对15个0.5<z<1.1的光学选择活动星系核的研究结果。GEMS是哈勃太空望远镜的成像巡天，以F606 W和F850 LP滤波器波段的钱德拉深场南部为中心，对一个约28“x28”的连续场进行成像。它结合了SEDs和红移的~10000对象，由COMBO-17项目获得。我们在F850 LP波段探测到了所有15个活动星系核的宿主星系（其中13个在F606 W波段），恢复了它们的通量、形态和结构参数。我们发现，80%的宿主星系具有早期型（膨胀为主）的形态，而其余的具有晚型（盘为主）星系的结构特征。我们发现，25%的早期类型和30%的晚期类型，表现出与星系相互作用一致的扰动。宿主星系呈现出各种各样的颜色，从红色序列星系到蓝色序列星系，这些颜色与正在形成的星星一致。大约有70%的早期星系的主星系具有静止坐标系的蓝色，这一比例比在这个红移和光度范围内的非活跃早期星系要大得多。然而，我们发现，早型主机在结构上类似于红色序列椭圆，因为它们遵循的绝对星等与半光大小的相关性是一致的平均关系的早型星系在类似的红移。
We present the results from a study of the host galaxies of 15 optically selected AGNs with 0.5<z<1.1 from GEMS. GEMS is a Hubble Space Telescope imaging survey of a ~28"x28" contiguous field centered on the Chandra Deep Field South in the F606W and F850LP filter bands. It incorporates the SEDs and redshifts of ~10000 objects, obtained by the COMBO-17 project. We have detected the host galaxies of all 15 AGNs in the F850LP-band (and 13/15 in the F606W-band), recovering their fluxes, morphologies and structural parameters. We find that 80% of the host galaxies have early-type (bulge-dominated) morphologies, while the rest have structures characteristic of late-type (disk-dominated) galaxies. We find that 25% of the early types, and 30% of the late types, exhibit disturbances consistent with galaxy interactions. The hosts show a wide range of colors, from those of red-sequence galaxies to blue colors consistent with ongoing star formation. Roughly 70% of the morphologically early-type hosts have rest-frame blue colors, a much larger fraction than those typical of non-active morphologically early-type galaxies in this redshift and luminosity range. Yet, we find that the early-type hosts are structurally similar to red-sequence ellipticals, inasmuch as they follow an absolute magnitude versus half-light size correlation that are consistent with the mean relation for early-type galaxies at similar redshifts.