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arXiv 0811.3977astro-ph
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COSMOS AGN光谱巡天I:XMM对应物

The COSMOS AGN Spectroscopic Survey I: XMM Counterparts

Jonathan R. Trump, Chris D. Impey, Martin Elvis, Patrick J. McCarthy, John P. Huchra, Marcella Brusa, Mara Salvato, Peter Capak, Nico Cappelluti, Francesca Civa… 展开作者

Jonathan R. Trump, Chris D. Impey, Martin Elvis, Patrick J. McCarthy, John P. Huchra, Marcella Brusa, Mara Salvato, Peter Capak, Nico Cappelluti, Francesca Civano, Andrea Comastri, Jared Gabor, Heng Hao, Gunther Hasinger, Knud Jahnke, Brandon C. Kelly, Simon J. Lilly, Eva Schinnerer, Nick Z. Scoville, Vernesa Smolcic

摘要:

我们提出了一个X射线和光通量限制的样品的光谱学677 XMM牛顿选定的目标覆盖2 deg^2宇宙领域,与产量的485高置信度的红移。大部分光谱是在三个季节(2005 - 2007年)用麦哲伦(巴德)望远镜上的IMACS仪器获得的。我们还包括在样本中以前公布的斯隆数字巡天光谱和补充观测MMT/Hectospec。我们详细的观察和分类分析。在通量极限为f_{0.5-10 keV}> 8 x 10 ^-16 erg cm ^-2 s ^-1和i_AB +<22的情况下,测量完成了90%,其中超过90%的目标具有高置信度的红移。对由于红移和光谱类型引起的不完整性进行简单的修正,可以将完整的总体描述为$i_AB +<23。修正后的样本包括57%宽发射线(类型1,无遮蔽)在0.13 <z <4.26的活动星系核,25%窄发射线(类型2,遮蔽)在0.07 <z <1.29的活动星系核,和18%吸收线(主体主导,遮蔽)在0 <z <1.22的活动星系核(不包括占X射线目标4%的恒星)。我们表明,这次巡天在X射线和光通量方面的限制包括了几乎所有的X射线活动星系核(定义为L_{0.5-10 keV}> 3 x 10^42 erg s ^-1),z <1,包括光学遮蔽和非遮蔽类型。我们发现统计上显著的证据表明,在z <1的活动星系核中,模糊与清晰的比例随着红移的增加而增加,随着光度的增加而减少。

英文摘要:

We present optical spectroscopy for an X-ray and optical flux-limited sample of 677 XMM-Newton selected targets covering the 2 deg^2 COSMOS field, with a yield of 485 high-confidence redshifts. The majority of the spectra were obtained over three seasons (2005-2007) with the IMACS instrument on the Magellan (Baade) telescope. We also include in the sample previously published Sloan Digital Sky Survey spectra and supplemental observations with MMT/Hectospec. We detail the observations and classification analyses. The survey is 90% complete to flux limits of f_{0.5-10 keV}>8 x 10^-16 erg cm^-2 s^-1 and i_AB+<22, where over 90% of targets have high-confidence redshifts. Making simple corrections for incompleteness due to redshift and spectral type allows for a description of the complete population to $i_AB+<23. The corrected sample includes 57% broad emission line (Type 1, unobscured) AGN at 0.13<z<4.26, 25% narrow emission line (Type 2, obscured) AGN at 0.07<z<1.29, and 18% absorption line (host-dominated, obscured) AGN at 0<z<1.22 (excluding the stars that made up 4% of the X-ray targets). We show that the survey's limits in X-ray and optical flux include nearly all X-ray AGN (defined by L_{0.5-10 keV}>3 x 10^42 erg s^-1) to z<1, of both optically obscured and unobscured types. We find statistically significant evidence that the obscured to unobscured AGN ratio at z<1 increases with redshift and decreases with luminosity.

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