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arXiv 1311.1978astro-ph.CO
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类星体宿主星系中恒星形成区的定位

Locating Star-Forming Regions in Quasar Host Galaxies

J. E. Young, M. Eracleous, O. Shemmer, H. Netzer, C. Gronwall, Dieter Lutz, R. Ciardullo, Eckhard Sturm

摘要:

我们提出了一个研究的形态和强度的恒星形成的宿主星系的八个帕洛玛-绿色类星体使用的观测与哈勃太空望远镜。我们的观察是由最近的证据之间的密切关系黑洞的增长和恒星质量演化在其宿主星系。我们使用窄带[O II] $λ$ 3727,H $β$,[O III] $λ$ 5007和Pa $α$的图像,与WFPC 2和NICMOS仪器,映射线发射区的形态,并在消光校正后,诊断激发机制和推断恒星形成率。这类工作的重大挑战是将类星体光从恒星连续体中分离出来,以及将类星体激发的气体从恒星形成区域中分离出来。为此,我们提出了一种新的技术,类星体光的图像分解和减法。我们的主要结果是检测扩展线发射区域的大小范围从0.5到5千秒差距和对称分布的核心,主要由恒星形成。我们确定了几十M $_\odot$ /年的恒星形成率。我们的目标类星体的宿主星系具有$10^{11}$ M $_\odot$级的恒星质量和与M82和亮红外星系相当的特定恒星形成速率。因此,在特定的恒星形成与恒星质量图中,它们落在上包络线或刚好在恒星形成质量序列之上。我们看到了一个明显的趋势,增加恒星形成率与类星体的光度,加强主机和黑洞质量的增长之间的联系发现其他作者。

英文摘要:

We present a study of the morphology and intensity of star formation in the host galaxies of eight Palomar-Green quasars using observations with the Hubble Space Telescope. Our observations are motivated by recent evidence for a close relationship between black hole growth and the stellar mass evolution in its host galaxy. We use narrow-band [O II] $λ$3727, H$β$, [O III] $λ$5007 and Pa$α$ images, taken with the WFPC2 and NICMOS instruments, to map the morphology of line-emitting regions, and, after extinction corrections, diagnose the excitation mechanism and infer star-formation rates. Significant challenges in this type of work are the separation of the quasar light from the stellar continuum and the quasar-excited gas from the star-forming regions. To this end, we present a novel technique for image decomposition and subtraction of quasar light. Our primary result is the detection of extended line-emitting regions with sizes ranging from 0.5 to 5 kpc and distributed symmetrically around the nucleus, powered primarily by star formation. We determine star-formation rates of order a few tens of M$_\odot$/yr. The host galaxies of our target quasars have stellar masses of order $10^{11}$ M$_\odot$ and specific star formation rates on a par with those of M82 and luminous infrared galaxies. As such they fall at the upper envelope or just above the star-formation mass sequence in the specific star formation vs stellar mass diagram. We see a clear trend of increasing star formation rate with quasar luminosity, reinforcing the link between the growth of the stellar mass of the host and the black hole mass found by other authors.

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