Query : 2011A&A...529A.135R

2011A&A...529A.135R - Astronomy and Astrophysics, volume 529A, 135-135 (2011/5-1)

Optical and infrared properties of active galactic nuclei in the Lockman Hole.


Abstract (from CDS):

We present the observed-frame optical, near-, and mid-infrared properties of X-ray-selected active galactic nuclei (AGN) in the Lockman Hole. Using a likelihood ratio method on optical, near-infrared or mid-infrared catalogues, we assigned counterparts to 401 out of the 409 X-ray sources of the XMM-Newton catalogue. Accurate photometry was collected for all the sources from U to 24µm. We used X-ray and optical criteria to remove any normal galaxies, galactic stars, or X-ray clusters among them and studied the multi-wavelength properties of the remaining 377 AGN. We used a mid-IR colour-colour selection to understand the AGN contribution to the optical and infrared emission. Using this selection, we identified different behaviours of AGN-dominated and host-dominated sources in X-ray-optical-infrared colour-colour diagrams. More specifically, the AGN-dominated sources show a clear trend in the fx/fRC vs. RC-K and f24µm/fRC vs. RC-K diagrams, while the hosts follow the behaviour of non X-ray detected galaxies. In the optical-near-infrared colour-magnitude diagram we see that the known trend of redder objects to be more obscured in X-rays is stronger for AGN-dominated than for host-dominated systems. This is an indication that the trend is more related to the AGN, which contaminate the overall colours, than to any evolutionary effects. Finally, we find that a significant fraction (∼30%) of the reddest AGN are not obscured in X-rays.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: statistics - X-rays: galaxies - infrared: galaxies

VizieR on-line data: <Available at CDS (J/A+A/529/A135): table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 838 0
2 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 658 0
3 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1986 3
4 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2957 4

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