The low-metallicity QSO HE 2158 − 0107: a massive galaxy growing by accretion of nearly pristine gas from its environment?
The low-metallicity QSO HE 2158 − 0107: a massive galaxy growing by accretion of nearly pristine gas from its environment?
复制标题
DOI：
10.1051/0004-6361/201117596
复制
发表时间：
2011-09
影响因子：
6.5
通讯作者：
B. Husemann;L. Wisotzki;K. Jahnke;S. A. I. Potsdam;M. F. Astronomie;Centro Astron'omico Hispano Alem'an de Calar Alto
中科院分区：
文献类型：
--
作者：
B. Husemann;L. Wisotzki;K. Jahnke;S. A. I. Potsdam;M. F. Astronomie;Centro Astron'omico Hispano Alem'an de Calar Alto
活动星系核（AGN）的金属丰度在其窄线区通常远高于太阳，在其宽线区通常可达太阳的数倍，与红移无关。低金属丰度活动星系核是罕见的天体，到目前为止，它们一直与拥有低质量黑洞（MBH 10 6 M�）的低质量星系有关。我们给出了低红移（z = 0.212）类星体（QSO）HE 2158−0107的积分场光谱数据，我们发现了与大质量黑洞（MBH = 3 × 10 8 M）相关的太阳下NLR金属丰度的强有力证据。类星体被一个大的延伸发射线区域包围，从类星体延伸到30千秒差距，呈尾状几何形状。我们目前的光学和近红外图像，并调查宿主星系的属性。HE 2158−0107的宿主很可能是一个非常紧凑的膨胀主导星系，大小为1.4 kpc。宿主的多色光谱能量分布（SED）相当蓝，表明在过去的1 Gyr内形成了一个重要的年轻恒星群体。H带光度的Lbulge，H的3σ上限< 4.5 × 10 10 L-H，H，相应的恒星质量上限
The metallicities of active galactic nuclei (AGN) are usually well above solar in their narrow-line regions, often reaching up to several times solar in their broad-line regions independent of redshift. Low-metallicity AGN are rare objects that have so far always been associated with low-mass galaxies hosting low-mass black holes (MBH 10 6 M� ). We present integral field spectroscopy data of the low-redshift (z = 0.212) quasi-stellar object (QSO) HE 2158−0107 for which we find strong evidence of sub-solar NLR metallicities associated with a massive black hole (MBH ∼ 3 × 10 8 M� ). The QSO is surrounded by a large extended emission-line region reaching out to 30 kpc from the QSO in a tail-like geometry. We present optical and near-infrared images and investigate the properties of the host galaxy. The host of HE 2158−0107 is most likely a very compact bulge-dominated galaxy with a size of re ∼ 1.4 kpc. The multi-colour spectral energy distribution (SED) of the host is quite blue, indicative of a significant young age stellar population formed within the last 1 Gyr. A 3σ upper limit of Lbulge,H < 4.5 × 10 10 L� ,H for the H-band luminosity and a corresponding stellar mass upper