2007A&A...472..797L

Query : 2007A&A...472..797L

2007A&A...472..797L - Astronomy and Astrophysics, volume 472797-803 (2007/9-4)

AGN counts at 15 µm. XMM observations of the ELAIS-S1-5 sample.

LA FRANCA F., PUCCETTI S., SACCHI N., FERUGLIO C., FIORE F., GRUPPIONI C., LAMASTRA A., MATUTE I., MELINI G. and POZZI F.

Abstract (from CDS):

The counts of galaxies and AGN in the mid infra-red (MIR) bands are important instruments for studying their cosmological evolution. However, the classic spectral line ratios techniques can become misleading when trying to properly separate AGN from starbursts or even from apparently normal galaxies. We use X-ray band observations to discriminate AGN activity in previously classified MIR-selected starburst galaxies and to derive updated AGN1 and (Compton thin) AGN2 counts at 15µm. XMM observations of the ELAIS-S1 15µm sample down to flux limits ∼2x10–15erg/cm2/s (2-10keV band) were used. We classified as AGN all those MIR sources with a unabsorbed 2-10keV X-ray luminosity higher that ∼1042erg/s. We find that at least about 13±6% of the previously classified starburst galaxies harbor an AGN. According to these figures, we provide an updated estimate of the counts of AGN1 and (Compton thin) AGN2 at 15µm. It turns out that at least 24% of the extragalactic sources brighter than 0.6mJy at 15µm are AGN (∼13% contribution to the extragalactic background produced at fluxes brighter than 0.6mJy).

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - infrared: galaxies - galaxies: active - surveys - galaxies: evolution - X-rays: galaxies

CDS comments: ELAISC15 J003603-433155 is a misprint for ELAISC15 J003603-433152.

Simbad objects: 73

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Number of rows : 73
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ELAISC15 J003234-431642 IR 00 32 34.15 -43 16 42.1           ~ 4 0
2 [VV2006] J003234.3-431937 QSO 00 32 34.3399756080 -43 19 37.945028820   19.492 19.455 19.191   ~ 19 0
3 ELAISC15 J003242-431548 IR 00 32 42.56 -43 15 48.5           ~ 5 0
4 ELAISC15 J003249-433201 IR 00 32 49.89 -43 32 01.3           ~ 4 0
5 2MASS J00325743-4334270 EmG 00 32 57.4346252472 -43 34 27.202630836   19.87 18.94 18.26   ~ 8 0
6 2MASS J00325805-4331451 EmG 00 32 58.0319601624 -43 31 45.881625396       19.01   ~ 6 0
7 ATELAIS J003314.04-431523.2 EmG 00 33 14.00 -43 15 23.3   20.81 19.62 18.89   ~ 8 0
8 ELAISC15 J003315-432829 IR 00 33 15.67 -43 28 29.7           ~ 4 0
9 2MASS J00331645-4310004 LIN 00 33 16.4526757464 -43 10 00.438198960   19.11 18.21 17.66   ~ 12 0
10 ELAISC15 J003317-431706 IR 00 33 17.14 -43 17 06.2           ~ 5 0
11 ELAISC15 J003318-431659 IR 00 33 18.65 -43 16 59.1           ~ 5 0
12 ATELAIS J003322.30-432633.6 EmG 00 33 22.36 -43 26 33.1   20.33 19.31 18.72   ~ 8 0
13 ELAISC15 J003329-431322 EmG 00 33 29.55 -43 13 22.6       18.38   ~ 6 0
14 ELAISC15 J003330-431553 IR 00 33 30.46 -43 15 53.2           ~ 5 0
15 2MASS J00333584-4316550 EmG 00 33 35.8652314320 -43 16 54.830191476   20.10 19.15 18.51   ~ 8 0
16 ATELAIS J003346.27-431944.2 LIN 00 33 46.2851679792 -43 19 43.804098876   21.224 20.114 19.321   ~ 13 0
17 ELAISC15 J003347-431201 EmG 00 33 47.53 -43 12 01.8       19.21   ~ 6 0
18 2MASX J00335649-4320596 EmG 00 33 56.5351012968 -43 20 59.180626716   18.51 17.61 17.07   ~ 9 0
19 ELAISC15 J003357-433839 IR 00 33 57.09 -43 38 39.9     24.460 22.140   ~ 5 0
20 LEDA 552561 Sy2 00 34 01.4897830080 -43 08 48.644446812   16.36   15.17   ~ 15 0
21 ELAISC15 J003407-433559 EmG 00 34 07.18 -43 35 59.3   21.581 20.403 19.718   ~ 8 0
22 ELAISC15 J003407-434725 EmG 00 34 07.56 -43 47 25.5       20.79   ~ 6 0
23 [VV2006] J003409.0-431012 QSO 00 34 08.9377760928 -43 10 12.422727948   19.810 19.550 19.20   ~ 14 0
24 ELAISC15 J003410-435217 IR 00 34 10.79 -43 52 17.4           ~ 4 0
25 ELAISC15 J003414-433012 IR 00 34 14.81 -43 30 12.0           ~ 4 0
26 2MASS J00341612-4309417 rG 00 34 16.0773758760 -43 09 41.390606664   19.89 19.45 18.37   ~ 8 0
27 2MASX J00341621-4339053 EmG 00 34 16.1987244864 -43 39 05.131638360       16.54   ~ 7 0
28 ELAISC15 J003417-433422 EmG 00 34 17.61 -43 34 22.9       19.16   ~ 6 0
29 2MASS J00342170-4315321 EmG 00 34 21.7102768968 -43 15 32.064532236   19.03 18.02 17.43   ~ 7 0
30 LEDA 130034 EmG 00 34 29.064 -43 26 15.29   11.46   15.41   ~ 20 0
31 MCG-07-02-007 EmG 00 34 32.5706897352 -43 39 21.914917776   14.19 13.635 12.73   ~ 34 0
32 2MASS J00343946-4326548 EmG 00 34 39.4604981136 -43 26 55.095094356   18.51 17.78 17.24   ~ 7 0
33 ATELAIS J003441.36-433042.9 rG 00 34 41.3673569208 -43 30 41.017471308   20.03 18.920 18.31   ~ 10 0
34 ELAISC15 J003447-432447 IR 00 34 47.23 -43 24 47.3           ~ 5 0
35 ATELAIS J003502.40-432412.1 EmG 00 35 02.52 -43 24 10.9   19.24 18.45 18.02   ~ 9 0
36 2MASX J00350332-4321168 EmG 00 35 03.3841463208 -43 21 16.967847168   18.24 17.30 16.85   ~ 8 0
37 2MASS J00350352-4311382 EmG 00 35 03.5242173024 -43 11 38.304165768   19.52 18.65 18.07   ~ 8 0
38 2MASS J00350498-4307525 * 00 35 04.9657868928 -43 07 51.823484904           ~ 5 0
39 ELAISC15 J003507-431236 EmG 00 35 07.22 -43 12 36.2       18.60   ~ 6 0
40 2MASS J00351231-4315374 EmG 00 35 12.315 -43 15 37.48   21.31 20.27 19.50   ~ 9 0
41 2MASX J00351341-4335398 EmG 00 35 13.3467535272 -43 35 39.607668096   18.92 17.47 16.80   ~ 8 0
42 2MASS J00351562-4333576 Sy1 00 35 15.6051551328 -43 33 57.714801948   17.391 16.936 16.666   ~ 16 0
43 ELAISC15 J003516-430750 IR 00 35 16.44 -43 07 50.7           ~ 4 0
44 ATELAIS J003517.27-431121.5 EmG 00 35 17.1993903528 -43 11 21.944432832   18.844 17.785 17.269   ~ 8 0
45 LEDA 545508 EmG 00 35 17.74 -43 42 52.5       17.63   ~ 7 0
46 2MASS J00351927-4337106 EmG 00 35 19.273 -43 37 10.65   20.093 18.841 18.263   ~ 9 0
47 2MASS J00351944-4313246 EmG 00 35 19.3856161824 -43 13 24.382827228   19.88 18.84 18.12   ~ 8 0
48 2MASS J00352015-4336453 rG 00 35 20.1286042224 -43 36 45.607213188   19.78 18.800 18.18   ~ 9 0
49 2MASS J00352149-4324474 EmG 00 35 21.4738092264 -43 24 47.336134932   19.40 18.65 18.08   ~ 8 0
50 2MASS J00352365-4325150 EmG 00 35 23.658 -43 25 15.01       19.43   ~ 6 0
51 ELAISC15 J003529-433923 IR 00 35 29.42 -43 39 23.3           ~ 4 0
52 ELAISC15 J003529-430746 EmG 00 35 29.96 -43 07 46.8       19.04   ~ 6 0
53 2MASS J00353152-4344453 EmG 00 35 31.523 -43 44 45.35       18.29   ~ 7 0
54 ATELAIS J003541.32-433301.4 EmG 00 35 41.40 -43 33 01.5   20.78 20.34 19.64   ~ 9 0
55 ATELAIS J003545.43-433216.3 EmG 00 35 45.49 -43 32 16.8   20.47 20.090 19.55   ~ 10 0
56 ELAISC15 J003545-431833 G 00 35 45.91 -43 18 33.7           ~ 5 0
57 ELAISC15 J003548-430640 IR 00 35 48.15 -43 06 40.7           ~ 5 0
58 ATELAIS J003551.01-430506.6 Sy2 00 35 51.05 -43 05 06.2   22.49 21.29 20.41   ~ 9 0
59 SWIRE J003603.65-433152.5 Sy2 00 36 03.6 -43 31 52       21.23   ~ 10 0
60 ELAISC15 J003612-434627 IR 00 36 12.69 -43 46 27.9           ~ 4 0
61 ELAISC15 J003615-431327 EmG 00 36 15.22 -43 13 27.1       19.25   ~ 6 0
62 2MASS J00361919-4326068 EmG 00 36 19.1916475128 -43 26 07.184468400       17.33   ~ 7 0
63 ELAISC15 J003620-430920 IR 00 36 20.56 -43 09 20.7           ~ 4 0
64 ATELAIS J003622.71-432824.6 rG 00 36 22.66 -43 28 26.7   25.430 23.470 21.61   ~ 8 0
65 ELAISC15 J003623-432702 EmG 00 36 23.86 -43 27 02.3       21.53   ~ 6 0
66 ELAISC15 J003627-432426 IR 00 36 27.13 -43 24 26.7           ~ 4 0
67 EIRS 4 Sy1 00 36 40.4 -43 39 26   23.125 22.238 21.353   ~ 14 0
68 ELAISC15 J003647-433424 IR 00 36 47.89 -43 34 24.4           ~ 4 0
69 ELAISC15 J003648-432259 IR 00 36 48.01 -43 22 59.2           ~ 4 0
70 ATELAIS J003648.79-431020.7 EmG 00 36 48.8054734032 -43 10 20.586252180   19.71 19.60 18.42   ~ 8 0
71 ELAISC15 J003650-434519 IR 00 36 50.39 -43 45 19.1           ~ 4 0
72 ELAISC15 J003656-434312 IR 00 36 56.00 -43 43 12.2           ~ 5 0
73 NGC 3256 Sy2 10 27 51.284 -43 54 13.55   11.83 11.33 10.62 11.9 ~ 920 2

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