2008ApJ...673..730G

Query : 2008ApJ...673..730G

2008ApJ...673..730G - Astrophys. J., 673, 730-741 (2008/February-1)

The revealing dust: mid-infrared activity in Hickson compact group galaxy nuclei.

GALLAGHER S.C., JOHNSON K.E., HORNSCHEMEIER A.E., CHARLTON J.C. and HIBBARD J.E.

Abstract (from CDS):

We present a sample of 46 galaxy nuclei from 12 nearby (z<4500 km/s) Hickson Compact Groups (HCGs) with a complete suite of 1-24 µm 2MASS + Spitzer nuclear photometry. For all objects in the sample, blue emission from stellar photospheres dominates in the near-infrared through the 3.6 µm IRAC band. Of 46 galaxy nuclei, 25 (54%) show red mid-infrared continua characteristic of hot dust powered by ongoing star formation and/or accretion onto a central black hole. We introduce αIRAC, the spectral index of a power-law fit to the 4.5-8.0 µm IRAC data, and demonstrate that it cleanly separates the mid-infrared-active and nonactive HCG nuclei. This parameter is more powerful for identifying low-to moderate-luminosity mid-infrared activity than other measures, which include data at rest-frame λ<3.6 µm that may be dominated by stellar photospheric emission. While the HCG galaxies clearly have a bimodal distribution in this parameter space, a comparison sample from the Spitzer Nearby Galaxy Survey (SINGS) matched in J-band total galaxy luminosity is continuously distributed. A second diagnostic, the fraction of 24 µm emission in excess of that expected from quiescent galaxies, f24D, reveals an additional three nuclei to be active at 24 µm. Comparing these two mid-infrared diagnostics of nuclear activity to optical spectroscopic identifications from the literature reveals some discrepancies, and we discuss the challenges of distinguishing the source of ionizing radiation in these and other lower luminosity systems. We find a significant correlation between the fraction of mid-infrared-active galaxies and the total H I mass in a group and investigate possible interpretations of these results in light of galaxy evolution in the highly interactive system of a compact group environment.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Active - Galaxies: Interactions - Galaxies: Nuclei - Galaxies: Starburst - Infrared: Galaxies

Simbad objects: 59

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Number of rows : 59
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 Mrk 552 GiG 00 31 18.844 +08 28 30.33   15.0   13.40   ~ 76 0
2 UGC 312 AGN 00 31 23.840 +08 28 01.32   14.6   13.10   ~ 104 0
3 HCG 2 CGG 00 31 24 +08 26.8           ~ 48 0
4 UGC 314 GiG 00 31 29.3689510392 +08 24 02.141295480   15.4   13.97   ~ 47 0
5 NGC 192 rG 00 39 13.4 +00 51 51   13.9   11.97   ~ 135 0
6 HCG 7 CGG 00 39 15.9 +00 53 17   11.4       ~ 87 0
7 NGC 196 GiG 00 39 17.8424526792 +00 54 45.971984916   14.2   12.40   ~ 83 0
8 NGC 197 GiP 00 39 18.7935711480 +00 53 31.087552704   14.85   13.39   ~ 58 0
9 NGC 201 EmG 00 39 34.8489575280 +00 51 35.886502080   14.7   12.41   ~ 103 0
10 NGC 833 Sy2 02 09 20.8490871072 -10 07 59.003785884   14.02 13.00 12.75   ~ 191 0
11 NGC 835 Sy2 02 09 24.606 -10 08 09.31   13.29 12.45 12.24   ~ 206 0
12 NGC 838 LIN 02 09 38.562 -10 08 46.12   13.72   12.65   ~ 195 0
13 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 169 0
14 NGC 839 GiG 02 09 42.8 -10 11 02   13.98 11.42 12.70   ~ 151 0
15 MCG-02-07-073 GiG 02 42 38.2975281144 -12 25 16.057616304   14.51   12.85   ~ 49 0
16 MCG-02-07-074 EmG 02 42 41.942 -12 25 38.79   15.79   14.44   ~ 36 0
17 HCG 19 CGG 02 42 45 -12 24.7           ~ 37 0
18 MCG-02-07-075 GiG 02 42 46.757 -12 23 52.50   15.58   14.25   ~ 27 0
19 NGC 1189 GiP 03 03 24.48 -15 37 24.5   13.8   13.5 13.4 ~ 55 0
20 NGC 1190 GiP 03 03 26.1380266368 -15 39 42.731214516   15.32   13.64   ~ 49 0
21 HCG 22 CGG 03 03 31 -15 40.5           ~ 69 0
22 NGC 1199 GiP 03 03 38.4220343160 -15 36 48.461862600   13.99 12.97 12.31 11.59 ~ 184 1
23 2MFGC 4113 G 05 01 35.550 -04 15 47.42   15.35   14.73   ~ 62 0
24 HCG 31 CGG 05 01 37 -04 15.4           ~ 128 0
25 HCG 31e G 05 01 37.5 -04 15 57           ~ 25 0
26 2MASX J05013782-0415294 G 05 01 37.832 -04 15 28.48   13.44   12.76   ~ 71 1
27 NGC 1741 EmG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 266 0
28 LEDA 3092704 GiG 05 01 38.3 -04 13 21           ~ 22 0
29 IC 399 EmG 05 01 44.0604445128 -04 17 19.319048052   15.0 14.8     ~ 70 0
30 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5858 6
31 MCG-03-26-006 GiG 10 00 10.2917665944 -19 37 18.674077584   14.56 13.36 12.86 12.04 ~ 49 0
32 2MASX J10001284-1940203 GiG 10 00 12.8440362744 -19 40 20.615891736   16.54 14.90 14.73 13.64 ~ 27 0
33 HCG 42 CGG 10 00 13.1 -19 38 24           ~ 99 0
34 NGC 3091 BiC 10 00 14.125 -19 38 11.32   12.04 10.61 10.56 9.25 ~ 184 0
35 NGC 3096 GiG 10 00 33.1214332440 -19 39 42.939578196   14.08 13.09 13.03 11.75 ~ 48 0
36 2MASX J10374052-2703284 GiC 10 37 40.5359670816 -27 03 28.944358812   16.52   14.75   ~ 43 0
37 2MASX J10374157-2702394 GiC 10 37 41.5570117416 -27 02 39.942793968   17.48   15.62   ~ 39 0
38 HCG 48 CGG 10 37 45.6 -27 04 50           ~ 56 0
39 IC 2597 GiG 10 37 47.3320133088 -27 04 52.576660812   12.75   11.08   ~ 104 0
40 ESO 501-59 Sy2 10 37 49.5111941472 -27 07 16.163757372   14.21 13.55 13.13   ~ 64 0
41 IC 736 GiG 11 48 20.1140766552 +12 42 59.635098360   15.3   14.22   ~ 50 0
42 HCG 59 CGG 11 48 27 +12 43.0           ~ 53 0
43 IC 737 GiG 11 48 27.5480690496 +12 43 38.466700032   14.7   13.48   ~ 50 0
44 MCG+02-30-040 GiC 11 48 30.666 +12 43 47.25   16.29   15.21   ~ 42 0
45 Z 68-73 LSB 11 48 32.439 +12 42 18.36   16.04   15.05   ~ 52 0
46 NGC 4169 Sy2 12 12 18.7701840312 +29 10 45.851425968   12.9 12.34 11.67   ~ 142 1
47 HCG 61 CGG 12 12 25.587 +29 09 57.14     13.5     ~ 57 0
48 NGC 4174 Sy2 12 12 26.8876661016 +29 08 57.158312172   14.3 13.64 13.05   ~ 109 2
49 NGC 4175 AGN 12 12 31.086 +29 10 08.06   14.2 13.45 12.71   ~ 115 0
50 NGC 4759 GiG 12 53 04.66 -09 12 02.1   14.21   12.04   ~ 50 0
51 HCG 62 CGG 12 53 05.6 -09 12 21           ~ 306 0
52 NGC 4761 BiC 12 53 05.6960048016 -09 12 14.579980632   13.79   11.25   ~ 86 1
53 6dFGS gJ125306.6-091528 GiG 12 53 06.6310197888 -09 15 27.601345548   16.30   14.11   ~ 28 0
54 NGC 4764 GiG 12 53 09.8 -09 11 50   15.00   13.59   ~ 33 0
55 NGC 7172 Sy2 22 02 01.897 -31 52 11.60   12.72 13.61 11.15 25.10 ~ 529 1
56 NGC 7173 GiP 22 02 03.1741852512 -31 58 25.338407412   12.10   10.59   ~ 136 0
57 HCG 90 CGG 22 02 06.3 -31 55 48           ~ 130 0
58 NGC 7174 GiP 22 02 06.45 -31 59 34.7   12.26 12.15 10.84   ~ 87 0
59 NGC 7176 GiP 22 02 08.4333223632 -31 59 23.446700592   12.08   10.59   ~ 124 0

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