2011A&A...525A..38S


Query : 2011A&A...525A..38S

2011A&A...525A..38S - Astronomy and Astrophysics, volume 525A, 38-38 (2011/1-1)

Suzaku and SWIFT-BAT observations of a newly discovered compton-thick AGN.

SEVERGNINI P., CACCIANIGA A., DELLA CECA R., BRAITO V., VIGNALI C., LA PAROLA V. and MORETTI A.

Abstract (from CDS):

Obscured AGN are fundamental to understand the history of supermassive black hole growth and their influence on galaxy formation. However, the Compton-thick AGN (NH>1024cm–2) population is basically unconstrained, with less than a few dozen confirmed Compton-thick AGN found and studied so far. A way to select heavily obscured AGN is to compare the X-ray emission below 10keV (which is strongly depressed) with the emission from other bands that are less affected by the absorption, like the IR band. To this end, we have cross-correlated the 2XMM catalogue with the IRAS Point Source catalogue and, by using the X-ray to infrared flux ratio and X-ray colours, we selected a well defined sample of Compton-thick AGN candidates at z<0.1. The aim of this work is to confirm the nature and to study one of these local Compton-thick AGN candidates, the nearby (z=0.029) Seyfert 2 galaxy IRAS 04507+0358, by constraining the amount of intrinsic absorption (NH) and thus the intrinsic luminosity. To this end we obtained deep (100 ks) Suzaku observations (AO4 call) and performed a joint fit with SWIFT-BAT data. We analysed XMM-Newton, Suzaku and SWIFT-BAT data and present here the results of this broad-band (0.4-100keV) spectral analysis. We found that the broad-band X-ray emission of IRAS 04507+0358 requires a large amount of absorption (higher than 1024cm–2) to be well reproduced, thus confirming the Compton-thick nature of this source. In particular, the most probable scenario is that of a mildly (NH∼1.3-1.5x1024cm–2, L(2-10keV) ∼5-7x1043erg/s) Compton-thick AGN.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: IRAS 04507+0358 - galaxies: Seyfert - X-rays: galaxies

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 Z 420-15 Sy2 04 53 25.7402917464 +04 03 41.809965948   15.0       ~ 123 0
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5894 6
3 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 981 4
4 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2000 3
5 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1645 2
6 MCG-03-58-007 Sy2 22 49 37.1473817784 -19 16 26.364266220   15.62 14.79     ~ 110 1

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