Integral field spectroscopy of nearby QSOs – I. ENLR size–luminosity relation, ongoing star formation and resolved gas-phase metallicities

Integral field spectroscopy of nearby QSOs – I. ENLR size–luminosity relation, ongoing star formation and resolved gas-phase metallicities
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附近 QSO 的积分场光谱 – I ENLR 尺寸 – 光度关系、正在进行的恒星形成和解析的气相金属丰度

DOI:
10.1093/mnras/stu1167
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发表时间:
2014
影响因子:
4.8
通讯作者:
Schramm
Schramm
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Husemann;Jahnke;Sanchez;Wisotzki;Nugroho;Schramm

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我们给出了一个流量受限的19个低红移(z<0.2)准恒星天体(QSO)的光学积分场光谱,并在2-5kpC的物理分辨率下对它们的电离气体性质进行了空间解析。扩展的电离气体存在于所有类星体宿主星系中,无论它们的形态类型如何。被活动星系核(AGN)的辐射光致电离的扩展窄线区(ENLR)的大小可达几个kpc,并且与5100ä的类星体连续谱光度的相关性比与积分[OIII]光度的相关性更强。我们找到了形式logR∝的关系式(0.46±0.0 4)logL5 10 0,加强了横跨ENLR的电离云的电离参数近似恒定的图景。除了ENLR,我们还发现在KPC尺度上超过50%的星系中有年轻的大质量恒星电离的气体。在超过一半的样本中,基于消光校正的H-α光度的特定恒星形成率与非活动的盘状主控星系的恒星形成率一致,即使对于一些以凸起为主的类星体宿主也是如此。高达∼70Mȯyr−1的恒星形成率是罕见的,而且总是与主要合并的签名有关。与基于60+100μm远红外(FIR)光度的恒星形成率的比较表明,FIR光度受到活动星系核发射的系统性污染,而Hα似乎是一种更可靠和更灵敏的恒星形成率示踪剂。在我们的样本中,有效的活动星系核反馈的证据很少,但我们的一些类星体宿主缺乏正在形成的恒星的特征,这导致了相对于主要星系序列的特定恒星形成率降低。这是与AGN有因果关系,还是仅仅是天然气枯竭造成的,仍然是一个悬而未决的问题。基于我们可以进行测量的12个类星体,我们发现,平均而言,以膨胀为主的类星体宿主星系与以盘状为主的对应星系相比,往往低于质量-金属丰度关系。虽然对我们的小样本来说还没有统计意义,但如果这种金属稀释可以被证明与最近或正在进行的星系相互作用有关,这可能会为未来的大型调查提供有用的诊断。
We present optical integral field spectroscopy for a flux-limited sample of 19 quasi-stellar objects (QSOs) at low redshift (z< 0.2) and spatially resolve their ionized gas properties at a physical resolution of 2–5 kpc. Extended ionized gas exists in all QSO host galaxies irrespective of their morphological types. The extended narrow-line regions (ENLRs), photoionized by the radiation of active galactic nuclei (AGN), have sizes of up to several kpc and correlate more strongly with the QSO continuum luminosity at 5100 Å than with the integrated [Oiii] luminosity. We find a relation of the form logr∝ (0.46 ± 0.04)logL5100, reinforcing the picture of an approximately constant ionization parameter for the ionized clouds across the ENLR. Besides the ENLR, we also find gas ionized by young massive stars in more than 50 per cent of the galaxies on kpc scales. In more than half of the sample, the specific star formation rates based on the extinction-corrected Hα luminosity are consistent with those of inactive disc-dominated galaxies, even for some bulge-dominated QSO hosts. Enhanced star formation rates of up to ∼70 Mȯyr−1are rare and always associated with signatures of major mergers. Comparison with the star formation rate based on the 60+100 μm far-infrared (FIR) luminosity suggests that the FIR luminosity is systematically contaminated by AGN emission and Hα appears to be a more robust and sensitive tracer for the star formation rate. Evidence for efficient AGN feedback is scarce in our sample, but some of our QSO hosts lack signatures of ongoing star formation leading to a reduced specific star formation rate with respect to the main sequence of galaxies. Whether this is causally linked to the AGN or simply caused by gas depletion remains an open question. Based on 12 QSOs where we can make measurements, we find that on average bulge-dominated QSO host galaxies tend to fall below the mass–metallicity relation compared to their disc-dominated counterparts. While not yet statistically significant for our small sample, this may provide a useful diagnostic for future large surveys if this metal dilution can be shown to be linked to recent or ongoing galaxy interactions.
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