Unveiling obscured accretion in the Chandra Deep Field-South

被引：223

作者：

Fiore, F. ^{[1
]}

Grazian, A. ^{[1
]}

Santini, P. ^{[2
]}

Puccetti, S. ^{[3
]}

Brusa, M. ^{[4
]}

Feruglio, C. ^{[1
]}

Fontana, A. ^{[1
]}

Giallongo, E. ^{[1
]}

Comastri, A. ^{[5
]}

Gruppioni, C. ^{[5
]}

Pozzi, F.

Zamorani, G. ^{[5
]}

Vignali, C. ^{[6
]}

机构：

[1] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy

[2] Univ Roma La Sapienza, Rome, Italy

[3] ASI Sci Data Ctr, I-00044 Frascati, Italy

[4] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[5] Osservatorio Astron Bologna, INAF, Bologna, Italy

[6] Univ Bologna, Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 672卷 / 01期

关键词：

galaxies : active; galaxies : high-redshift; X-rays : diffuse background;

D O I：

10.1086/523348

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We make use of deep HST, VLT, Spitzer, and Chandra data on the Chandra Deep Field-South to constrain the number of Compton-thick AGNs in this field. We show that sources with high 24 mu m-to-optical flux ratios and red colors form a distinct source population, and that their infrared luminosity is dominated by AGN emission. Analysis of the X-ray properties of these extreme sources shows that most of them (80% +/- 15%) are indeed likely to be highly obscured, Compton-thick AGNs. The number of infrared-selected, Compton-thick AGNs with 5.8 mu m luminosity higher than 10(44.2) ergs s(-1) turns out to be similar to that of X-ray-selected, unobscured, and moderately obscured AGNs with 2-10 keV luminosity higher than 10(43) ergs s(-1) in the redshift bin 1.2-2.6. This "factor of 2'' source population is exactly what is needed to solve the discrepancies between model predictions and X-ray AGN selection.

引用

页码：94 / 101

页数：8

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