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arXiv 0902.4704astro-ph.CO
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SINS巡天:高红移恒星形成星系中的宽发射线

The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies

Kristen L. Shapiro, Reinhard Genzel, Eliot Quataert, Natascha M. Förster Schreiber, Richard Davies, Linda Tacconi, Lee Armus, Nicolas Bouché, Peter Buschkamp, A… 展开作者

Kristen L. Shapiro, Reinhard Genzel, Eliot Quataert, Natascha M. Förster Schreiber, Richard Davies, Linda Tacconi, Lee Armus, Nicolas Bouché, Peter Buschkamp, Andrea Cimatti, Giovanni Cresci, Emanuele Daddi, Frank Eisenhauer, Dawn K. Erb, Shy Genel, Erin K. S. Hicks, Simon J. Lilly, Dieter Lutz, Alvio Renzini, Alice Shapley, Charles C. Steidel, Amiel Sternberg

摘要:

通过叠加获得的z~2处恒星形成星系的高信噪比代表性光谱显示,在窄的H-α和[NII]发射线下方存在高速分量。当作为单一高斯模型时,这个宽分量的FWHM > 1500 km/s;当作为H-alpha和[NII]特征的宽翼模型时,它的FWHM > 500 km/s。这一特征在质量更大、恒星形成速度更快的系统中更容易发现,这些系统也往往是更老、更大的星系。我们将这种辐射解释为强大的恒星爆发驱动的星系风或活跃的超大质量黑洞的证据。如果星系风是造成广泛辐射的原因,那么观测到的这种气体的光度和速度意味着质量流出率与恒星形成率相当。另一方面,如果宽线区域的活动黑洞占广泛的功能,相应的黑洞质量估计是一个数量级低于当地的标度关系预测,这表明延迟组装的超大质量黑洞相对于他们的主机凸起。

英文摘要:

High signal-to-noise, representative spectra of star-forming galaxies at z~2, obtained via stacking, reveal a high-velocity component underneath the narrow H-alpha and [NII] emission lines. When modeled as a single Gaussian, this broad component has FWHM > 1500 km/s; when modeled as broad wings on the H-alpha and [NII] features, it has FWHM > 500 km/s. This feature is preferentially found in the more massive and more rapidly star-forming systems, which also tend to be older and larger galaxies. We interpret this emission as evidence of either powerful starburst-driven galactic winds or active supermassive black holes. If galactic winds are responsible for the broad emission, the observed luminosity and velocity of this gas imply mass outflow rates comparable to the star formation rate. On the other hand, if the broad line regions of active black holes account for the broad feature, the corresponding black holes masses are estimated to be an order of magnitude lower than those predicted by local scaling relations, suggesting a delayed assembly of supermassive black holes with respect to their host bulges.

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