arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.4477astro-ph.GAastro-ph.CO
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中红外选择类星体I:维里黑洞质量和爱丁顿比

Mid-Infrared Selected Quasars I: Virial Black Hole Mass and Eddington Ratios

Y. Sophia Dai, Martin Elvis, Jacqueline Bergeron, Giovanni G. Fazio, Jia-Sheng Huang, Belinda J. Wilkes, Christopher N. A. Willmer, Alain Omont, Casey Papovich

摘要:

我们提供了一个包含391个位于22度$^2$ SWIRE Lockman Hole场中的中红外选择(MIR,24 $μ$ m)宽发射线(BEL,1型)类星体的目录。这个类星体样本是从斯皮策MIPS的MIR中选择的,具有$S_{\rm 24} > 400μ$ Jy,以及用于宽线识别的光学星等极限r(AB)$<$ 22.5。该目录是基于MMT和SDSS光谱选择BEL类星体,扩展SDSS的覆盖范围,以微弱的幅度和较低的红移,并恢复一个更完整的类星体人口。MIR选择的类星体样本在$z\sim$ 1.4处达到峰值,并通过SDSS光度测量恢复了显著且恒定(20\%)的扩展对象部分,这不包括在以点源为主的SDSS类星体调查中。这个样本也恢复了在$i > 19.1$的$z < 3$类星体的显着人口。然后,我们研究了这些MIR类星体的连续光度和谱线轮廓,并估计了它们的维里黑洞质量和爱丁顿比。SMBH质量显示了缩小的证据,尽管爱丁顿比保持恒定在$1 < z < 4$。与相同红移范围内的点源相比,$z < 1$的扩展源显示出系统性的较低爱丁顿比。目录和光谱可在网上公开获得。

英文摘要:

We provide a catalog of 391 mid-infrared-selected (MIR, 24$μ$m) broad-emission-line (BEL, type 1) quasars in the 22 deg$^2$ SWIRE Lockman Hole field. This quasar sample is selected in the MIR from Spitzer MIPS with $S_{\rm 24} > 400μ$Jy, jointly with an optical magnitude limit of r (AB) $<$ 22.5 for broad line identification. The catalog is based on MMT and SDSS spectroscopy to select BEL quasars, extends the SDSS coverage to fainter magnitudes and lower redshifts, and recovers a more complete quasar population. The MIR-selected quasar sample peaks at $z\sim$1.4, and recovers a significant and constant (20\%) fraction of extended objects with SDSS photometry across magnitudes, which was not included in the SDSS quasar survey dominated by point sources. This sample also recovers a significant population of $z < 3$ quasars at $i > 19.1$. We then investigate the continuum luminosity and line profiles of these MIR quasars, and estimate their virial black hole masses and the Eddington ratios. The SMBH mass shows evidence of downsizing, though the Eddington ratios remain constant at $1 < z < 4$. Compared to point sources in the same redshift range, extended sources at $z < 1$ show systematically lower Eddington ratios. The catalog and spectra are publicly available online.

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