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


Query : 2012A&A...542A..46S

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 - 2023
#notes
1 NGC 34 Sy2 00 11 06.612 -12 06 28.33   14.14 13.52     ~ 342 0
2 NGC 214 AGN 00 41 28.0237030104 +25 29 57.833719800   13.0       ~ 165 0
3 NGC 424 Sy2 01 11 27.6385025496 -38 05 00.421096524   13.76 14.12 12.38 12.8 ~ 313 0
4 NGC 591 Sy2 01 33 31.2305692968 +35 40 05.628351108   14.71 13.90     ~ 197 2
5 Mrk 573 Sy2 01 43 57.7777898304 +02 20 59.531401716   14.90 14.07     ~ 529 0
6 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4499 2
7 NGC 1194 Sy2 03 03 49.1124029328 -01 06 13.415103900   15.29 14.18     ~ 249 0
8 6dFGS gJ031308.8-024319 Sy2 03 13 08.7863687616 -02 43 19.070228820   15.31 14.0 14.14   ~ 40 0
9 NGC 1320 Sy2 03 24 48.6886857672 -03 02 32.121533436   14.0 14.00     ~ 275 0
10 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1744 2
11 NGC 1386 GiP 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 512 1
12 Z 420-15 Sy2 04 53 25.7402917464 +04 03 41.809965948   15.0       ~ 112 0
13 ESO 362-8 Sy2 05 11 09.098 -34 23 36.74   13.62 12.65 12.46   ~ 70 0
14 LEDA 17155 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 486 0
15 Mrk 3 Sy2 06 15 36.2812259376 +71 02 14.837219808 14.21 14.03 12.97     ~ 902 3
16 NGC 2273 Sy2 06 50 08.6691789600 +60 50 44.864645136   14.50 13.54     ~ 517 3
17 Mrk 78 Sy2 07 42 41.7033384240 +65 10 37.447730076   15.57 14.58     ~ 355 2
18 Mrk 622 Sy2 08 07 40.9957797624 +39 00 15.247008108   14.90 14.08     ~ 160 0
19 UGC 5101 Sy1 09 35 51.6045544584 +61 21 11.589382368   15.20 15.50     ~ 561 4
20 Mrk 1239 Sy1 09 52 19.168 -01 36 44.10   14.99 14.39 11.2   ~ 317 0
21 NAME M82 ULX-1 UX? 09 55 50.01 +69 40 46.0           ~ 267 1
22 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5767 6
23 NGC 3079 Sy2 10 01 57.8789863992 +55 40 47.449758324 11.57 11.54 10.86     ~ 1366 3
24 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 966 4
25 NGC 3982 Sy1 11 56 28.1445516072 +55 07 30.859586652   12.20 11.70 11.18   ~ 536 1
26 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1956 3
27 ESO 443-17 AGN 12 57 44.949 -29 45 59.04   13.84 13.73 12.52   ~ 49 0
28 NGC 4968 Sy2 13 07 05.976 -23 40 37.34   13.78 14.79 12.46 12.78 ~ 176 1
29 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4247 4
30 NGC 5256 PaG 13 38 17.5 +48 16 37   14.1 13.42     ~ 422 1
31 [OKM2018] SWIFT J1344.7+5588 Sy2 13 44 42.1781 +55 53 12.819   15.68 14.91     ~ 894 3
32 Mrk 463 Sy2 13 56 02.9 +18 22 18   14.8 14.22     ~ 383 2
33 NGC 5879 AGN 15 09 46.7271710112 +57 00 00.538947900   11.9       ~ 241 1
34 3C 321 Sy2 15 31 43.473 +24 04 18.93   16.0   15.40   ~ 322 1
35 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2918 4
36 IRAS 15480-0344 Sy2 15 50 41.4972847704 -03 53 17.990582640   16.20 15.1 14.83   ~ 96 0
37 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1616 2
38 IC 4769 Sy2 18 47 44.0507117496 -63 09 25.055124876   14.09   12.71 13.4 ~ 77 0
39 NAME Super Antennae Sy2 19 31 21.4272801984 -72 39 21.442847832   17.39 16.37 14.65   ~ 297 2
40 IC 4995 Sy2 20 19 58.9795544088 -52 37 18.903502956   14.32 14.06 12.84   ~ 60 0
41 NGC 6926 Sy2 20 33 06.1084582704 -02 01 38.498909376   14.87 13.87 13.0 12.5 ~ 148 2
42 NGC 7212 Sy2 22 07 01.9870259424 +10 14 00.838175892   15.1       ~ 189 1
43 MCG-03-58-007 Sy2 22 49 37.1473817784 -19 16 26.364266220   15.62 14.79     ~ 107 0
44 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 729 2
45 NGC 7582 GiP 23 18 23.6 -42 22 13 11.62 10.92 10.62     ~ 885 2
46 NGC 7674 Sy2 23 27 56.6973043968 +08 46 44.253707772 13.84 13.92 13.23 12.64   ~ 687 4
47 V* R Aqr Sy* 23 43 49.4634303216 -15 17 04.176349872   8.823 7.683 9.37   M6.5-8.5e 777 0

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2023.09.26-01:52:50

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