Details

Autor(en) / Beteiligte

• Fiore, F
• Grazian, A
• Santini, P
• Puccetti, S
• Brusa, M
• Feruglio, C
• Fontana, A
• Giallongo, E
• Comastri, A
• Gruppioni, C
• Pozzi, F
• Zamorani, G
• Vignali, C

Titel

Unveiling Obscured Accretion in the Chandra Deep Field-South

Ist Teil von

• The Astrophysical journal, 2008-01, Vol.672 (1), p.94-101

Ort / Verlag

Chicago, IL: IOP Publishing

Erscheinungsjahr

2008

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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-optlcal 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% plus or minus 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 super(44.2) ergs s super(-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 super(43) ergs s super(-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.