2012A&A...542A..46S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:59:04

2012A&A...542A..46S - Astronomy and Astrophysics, volume 542A, 46-46 (2012/6-1)

A new technique to efficiently select Compton-thick AGN.

SEVERGNINI P., CACCIANIGA A. and DELLA CECA R.

Abstract (from CDS):

We present a new efficient diagnostic method, based on mid-infrared and X-ray data, to select local (z<0.1) Compton-thick AGN with the aim of estimating their surface and space density. We define a region in the X-ray-to-mid-IR [F(2-12keV)/F25ν25] vs. X-ray color (HR) plane associated to Compton-thick AGN, i.e. [F(2-12keV)/F25ν25]<0.02 and HR>-0.2. On the basis of this selection method we build up a sample of 43 Compton-thick AGN candidates using data from IRAS Point Source and 2XMM-Newton catalogues. In order to test the efficiency of the proposed method in selecting Compton-thick AGN we use the results of the X-ray spectral analysis performed on all the sources of our sample (presented in a parallel work). After taking into account the different selection effects, we have estimated the number of Compton-thick in the local Universe and their density down to the IRAS flux limit of F25=0.5Jy. We find that the diagnostic plot proposed here is an efficient method to select Compton-thick AGN in the nearby Universe since ∼84% of the sources populating the proposed Compton-thick region are actually Compton-thick AGN. Twenty percent are newly-discovered Compton-thick AGN. We then estimate the surface density of Compton-thick AGN down to the IRAS PSC catalogue flux limit (F_25=0.5Jy) that turns out to be ρCT∼3x10–3src/deg2. After estimating an equivalent IR-to-hard-X-ray limiting flux, we compare our result with those found with Swift-BAT. We find that the surface density derived here is a factor 4 above the density computed in the hard X-ray surveys. This difference is ascribed, at least in part, to a significant contribution (∼60-90%) of the star-forming activity to the total 25µm emission for the sources in our sample. By considering only the 25µm AGN emission, we estimate a surface density of Compton-thick AGN which is consistent with the results found by hard X-ray surveys. Finally, we estimated the co-moving space density of Compton-thick AGN with intrinsic LX>1043erg/s (0.004<z<0.06): ΦC–thick~(3.5+4.5–0.5)x10–6Mpc–3. The prediction for Compton-thick AGN based on the synthesis model of X-ray background in Gilli et al. (2007A&A...463...79G) is consistent with this value.

Abstract Copyright:

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

Simbad objects: 47

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Number of rows : 47

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 34 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 308 0
2 NGC 214 AGN 00 41 28.0224647822 +25 29 57.842961904   13.0       ~ 145 0
3 NGC 424 Sy2 01 11 27.6374462713 -38 05 00.404099901   13.76 14.12 12.38 12.8 ~ 277 0
4 NGC 591 Sy2 01 33 31.2334491603 +35 40 05.621946090   14.71 13.90     ~ 187 2
5 Mrk 573 Sy2 01 43 57.7763654544 +02 20 59.525472345   14.90 14.07     ~ 488 0
6 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4118 2
7 NGC 1194 Sy2 03 03 49.110 -01 06 13.50   15.29 14.18     ~ 202 0
8 6dFGS gJ031308.8-024319 Sy2 03 13 08.819 -02 43 19.12   15.31 14.0 14.14   ~ 38 0
9 NGC 1320 Sy2 03 24 48.6903707574 -03 02 32.121207374   14.0 14.00     ~ 237 0
10 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1541 2
11 NGC 1386 GiP 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 466 1
12 2MASX J04532576+0403416 Sy2 04 53 25.7394366595 +04 03 41.800055196   15.0       ~ 95 0
13 ESO 362-8 Sy2 05 11 09.098 -34 23 36.74   13.62 12.65 12.46   ~ 65 0
14 2MASX J05210136-2521450 Sy2 05 21 01.3987198411 -25 21 45.269338983   15.47 14.75     ~ 430 0
15 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 849 3
16 NGC 2273 Sy2 06 50 08.6724567505 +60 50 44.879789544   14.50 13.54     ~ 466 3
17 Mrk 78 Sy2 07 42 41.7030525112 +65 10 37.433697338   15.57 14.58     ~ 332 2
18 Mrk 622 Sy2 08 07 40.9966349027 +39 00 15.262335904   14.90 14.08     ~ 138 0
19 UGC 5101 Sy1 09 35 51.599 +61 21 11.33   15.20 15.50     ~ 510 4
20 Mrk 1239 Sy1 09 52 19.168 -01 36 44.10   14.99 14.39 11.2   ~ 292 0
21 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 241 1
22 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5367 6
23 NGC 3079 Sy2 10 01 57.80342 +55 40 47.2428 11.57 11.54 10.86     ~ 1264 3
24 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 888 4
25 NGC 3982 Sy1 11 56 28.169 +55 07 31.30   12.20 11.70 11.18   ~ 491 1
26 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1791 3
27 ESO 443-17 AGN 12 57 44.949 -29 45 59.04   13.84 13.73 12.52   ~ 45 0
28 NGC 4968 Sy2 13 07 05.976 -23 40 37.34   13.78 14.79 12.46   ~ 165 1
29 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3833 4
30 NGC 5256 PaG 13 38 17.8 +48 16 41   14.1 13.42     ~ 400 2
31 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 830 3
32 Mrk 463 Sy2 13 56 02.9 +18 22 18   14.8 14.22     ~ 353 2
33 NGC 5879 AGN 15 09 46.7282797389 +57 00 00.544806616   11.9       ~ 227 1
34 3C 321 Sy2 15 31 43.473 +24 04 18.93   16.0   15.40   ~ 309 1
35 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2701 4
36 IRAS 15480-0344 Sy2 15 50 41.521 -03 53 17.58   16.20 15.1 14.83   ~ 82 0
37 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1491 2
38 IC 4769 Sy2 18 47 44.0482850819 -63 09 25.053255696   14.09   12.71 13.4 ~ 71 0
39 NAME Superantennae Sy2 19 31 21.4252803168 -72 39 21.448768732   17.39 16.37 14.65   ~ 276 2
40 IC 4995 Sy2 20 19 58.9782577650 -52 37 18.924571779   14.32 14.06 12.84   ~ 57 0
41 NGC 6926 Sy2 20 33 06.108 -02 01 39.07   14.87 13.87 13.0 12.5 ~ 127 2
42 NGC 7212 Sy2 22 07 01.9866638486 +10 14 00.849716443   15.1       ~ 164 1
43 MCG-03-58-007 Sy2 22 49 37.1463421968 -19 16 26.371480013   15.62 14.79     ~ 82 0
44 NGC 7479 Sy2 23 04 56.668 +12 19 22.36 11.74 11.60 10.85 10.47 9.66 ~ 672 2
45 NGC 7582 GiP 23 18 23.621 -42 22 14.06 11.62 10.92 10.62     ~ 809 2
46 NGC 7674 Sy2 23 27 56.6974755223 +08 46 44.238278540 13.84 13.92 13.23 12.64   ~ 642 4
47 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 742 0

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2020.10.21-15:59:04

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