2006ApJ...640..768H

Query : 2006ApJ...640..768H

2006ApJ...640..768H - Astrophys. J., 640, 768-783 (2006/April-1)

First detection of PAHs and warm molecular hydrogen in tidal dwarf galaxies.

HIGDON S.J., HIGDON J.L. and MARSHALL J.

Abstract (from CDS):

We observed two faint tidal dwarf galaxies (TDGs), NGC 5291 N and NGC 5291 S, with the Infrared Spectrograph on the Spitzer Space Telescope. We detect strong polycyclic aromatic hydrocarbon (PAH) emission at 6.2, 7.7, 8.6, 11.3, 12.6, and 16.5 µm, which match models of groups of ∼100 carbon atoms with an equal mixture of neutral and ionized PAHs. The TDGs have a dominant warm (∼140 K) dust component in marked contrast to the cooler (40-60 K) dust found in starburst galaxies. For the first time we detect the low-J rotational lines from molecular hydrogen. Adopting LTE, there is ∼105 M☉of ∼400 K gas, which is <0.1% of the cold gas mass inferred from 12CO (1-0) measurements. The combination of one-third solar metallicity with a recent (<5 million year) episode of star formation is reflected in the S and Ne ratios. The excitation is higher than typical values for starburst galaxies and similar to that found in BCDs. Using the Infrared Array Camera, we identify an additional 13 PAH-rich candidate TDGs. These sources occupy a distinct region of IRAC color space with [3.6]-[4.5]<0.4 and [4.5]-[8.0]>3.2. Their disturbed morphologies suggest past merger events between companions; for example, NGC 5291 S has a projected 11 kpc tail. NGC 5291 N and S have stellar masses of (1.5 and 3.0)x108 M☉, which is comparable to BCDs, although still roughly 10% of the LMC's stellar mass. The candidate TDGs are an order of magnitude less massive. This system appears to be a remarkable TDG nursery.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Dwarf - Galaxies: Formation - galaxies: individual (NGC 5291) - galaxies: individual (NGC 5291 S) - galaxies: individual (NGC 5291 N) - Galaxies: Interactions - Infrared: Galaxies

VizieR on-line data: <Available at CDS (J/ApJ/640/768): table4.dat>

Nomenclature: Table 4: [HHM2006] NN (Nos 1-75). Fig.12: [HHM2006] NNa (Nos 12a, 48a).

CDS comments: NGC 5291N and S = [BDL2001] NGC 5291N and [BDL2001] NGC 5291S.

Simbad objects: 101

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Number of rows : 101
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 Mrk 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1242 1
2 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
5 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
6 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
7 NGC 3561 LIN 11 11 13.1887412409 +28 41 47.044176908   14.7       ~ 202 2
8 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
9 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
10 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
11 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
12 [HHM2006] 1 AGN 13 47 06.99 -30 27 47.1           ~ 1 0
13 [HHM2006] 2 IR 13 47 07.68 -30 24 42.2           ~ 1 0
14 [HHM2006] 3 AGN 13 47 08.08 -30 25 33.0           ~ 1 0
15 [HHM2006] 4 AGN 13 47 12.57 -30 23 34.5           ~ 1 0
16 [HHM2006] 5 PoG 13 47 12.607 -30 27 24.79           ~ 1 0
17 [HHM2006] 6 AGN 13 47 12.64 -30 26 21.3           ~ 1 0
18 2MASX J13471278-3027250 GiC 13 47 12.7256262624 -30 27 24.511150332   11.19   14.76 14.49 ~ 10 0
19 [HHM2006] 7 IR 13 47 12.84 -30 21 48.3           ~ 1 0
20 [HHM2006] 8 AGN 13 47 12.87 -30 22 22.5           ~ 1 0
21 [HHM2006] 9 IR 13 47 14.18 -30 28 07.5           ~ 1 0
22 [HHM2006] 10 IR 13 47 14.51 -30 25 13.2           ~ 1 0
23 [HHM2006] 12 AGN 13 47 17.32 -30 24 53.0           ~ 1 0
24 [HHM2006] 11 IR 13 47 17.32 -30 20 21.1           ~ 1 0
25 [HHM2006] 13 AG? 13 47 17.51 -30 28 19.7           ~ 4 0
26 [HHM2006] 14 IR 13 47 17.65 -30 27 12.1           ~ 1 0
27 [HHM2006] 16 IR 13 47 17.80 -30 21 22.0           ~ 1 0
28 [BDB2007] GALEX J134717.91-302121.48 ISM 13 47 17.910 -30 21 21.48   20.03 19.76     ~ 4 0
29 [BDB2007] GALEX J134717.92-302158.54 G 13 47 17.920 -30 21 58.54   21.32 21.00     ~ 4 0
30 [HHM2006] 17 G 13 47 18.00 -30 21 09.1           ~ 1 0
31 [BDB2007] GALEX J134718.08-302150.30 G 13 47 18.080 -30 21 50.30           ~ 2 0
32 LEDA 717915 G 13 47 18.4 -30 23 00           ~ 4 0
33 [HHM2006] 19 G 13 47 18.41 -30 20 38.8           ~ 1 0
34 [HHM2006] 21 IR 13 47 18.92 -30 27 10.4           ~ 1 0
35 [HHM2006] 22 PoG 13 47 19.47 -30 26 54.8   19.87 19.61     ~ 4 0
36 2MASS J13471954-3024543 NIR 13 47 19.5602856024 -30 24 54.603995076           ~ 1 0
37 2MASS J13471961-3023568 * 13 47 19.6217960568 -30 23 56.810839740           ~ 1 0
38 [BDB2007] GALEX J134719.74-302025.73 G 13 47 19.740 -30 20 25.73   20.27 20.01     ~ 6 0
39 NGC 5291N GiG 13 47 20.42 -30 20 51.4   18.27 17.91     ~ 31 0
40 [HHM2006] 27 IR 13 47 20.44 -30 26 51.6           ~ 1 0
41 [BDB2007] GALEX J134720.69-302642.66 PoG 13 47 20.690 -30 26 42.66           ~ 2 0
42 [HHM2006] 29 IR 13 47 21.02 -30 23 03.8           ~ 1 0
43 LEDA 716831 PoG 13 47 21.3 -30 28 22           ~ 3 0
44 [HHM2006] 31 IR 13 47 22.10 -30 22 59.6           ~ 1 0
45 SLSBG 278 G 13 47 22.470 -30 21 44.13   19.85 19.39     ~ 6 0
46 NGC 5291S GiG 13 47 22.85 -30 27 30.8           ~ 18 0
47 [HHM2006] 34 IR 13 47 22.95 -30 29 28.9           ~ 1 0
48 [BDB2007] GALEX J134723.00-302724.31 HII 13 47 23.000 -30 27 24.31   18.87 18.63     ~ 6 0
49 NGC 5291B EmG 13 47 23.1864696240 -30 25 04.191653892   16   13.62   ~ 39 1
50 [HHM2006] 36 G 13 47 23.38 -30 26 59.5           ~ 2 0
51 [HHM2006] 37 IR 13 47 23.44 -30 29 23.3           ~ 1 0
52 [HHM2006] 39 G 13 47 23.46 -30 26 51.6           ~ 1 0
53 2MASS J13472347-3021279 * 13 47 23.4846617208 -30 21 28.017043920           ~ 1 0
54 [HHM2006] 40 IR 13 47 23.58 -30 20 44.0           ~ 1 0
55 [HHM2006] 42 G 13 47 23.79 -30 27 07.4           ~ 3 0
56 [BDB2007] GALEX J134723.86-302646.25 G 13 47 23.860 -30 26 46.25   21.88 21.65     ~ 4 0
57 [BDB2007] GALEX J134723.95-302622.21 PoG 13 47 23.950 -30 26 22.21   20.17 19.69     ~ 6 0
58 NGC 5291 Sy2 13 47 24.5000261808 -30 24 25.449445800   15.18 14.00 13.57 12.7 ~ 161 1
59 [HHM2006] 45 PoG 13 47 24.99 -30 22 28.5           ~ 2 0
60 2MASS J13472570-3029334 * 13 47 25.6952945736 -30 29 33.513476820           ~ 1 0
61 [HHM2006] 47 G 13 47 25.80 -30 25 48.8           ~ 2 0
62 [HHM2006] 48 IR 13 47 26.06 -30 23 43.1           ~ 1 0
63 [HHM2006] 49 G 13 47 26.24 -30 25 59.5           ~ 1 0
64 [HHM2006] 50 G 13 47 26.43 -30 26 05.4           ~ 1 0
65 [BDB2007] GALEX J134726.66-302552.06 PoG 13 47 26.660 -30 25 52.06   19.43 18.91     ~ 6 0
66 [HHM2006] 52 IR 13 47 26.78 -30 30 31.0           ~ 1 0
67 2MASS J13472691-3021328 NIR 13 47 26.92 -30 21 32.8           ~ 1 0
68 [LHC79] 2 PoG 13 47 27.30 -30 22 18.2           ~ 3 0
69 [HHM2006] 55 IR 13 47 27.70 -30 26 49.8           ~ 1 0
70 [BDB2007] GALEX J134727.77-302504.89 AGN 13 47 27.770 -30 25 04.89           ~ 2 0
71 [HHM2006] 57 IR 13 47 27.78 -30 22 04.3           ~ 1 0
72 [HHM2006] 58 IR 13 47 27.87 -30 24 53.3           ~ 1 0
73 [HHM2006] 59 PoG 13 47 29.10 -30 28 36.3           ~ 1 0
74 [HHM2006] 60 G 13 47 29.26 -30 24 14.7           ~ 2 0
75 2MASS J13473008-3022121 NIR 13 47 30.0711406104 -30 22 11.526079296           ~ 1 0
76 [HHM2006] 62 IR 13 47 30.69 -30 24 15.1           ~ 1 0
77 [HHM2006] 63 IR 13 47 30.83 -30 27 19.0           ~ 1 0
78 [HHM2006] 64 PoG 13 47 33.36 -30 23 25.6           ~ 1 0
79 2MASS J13473432-3021535 * 13 47 34.3355462928 -30 21 53.528927472           ~ 1 0
80 [HHM2006] 66 PoG 13 47 34.59 -30 28 03.7           ~ 1 0
81 [HHM2006] 67 IR 13 47 34.72 -30 25 55.0           ~ 1 0
82 [HHM2006] 68 IR 13 47 35.11 -30 26 16.7           ~ 1 0
83 2MASS J13473584-3023441 * 13 47 35.8425045936 -30 23 43.897159356           ~ 1 0
84 2MASS J13473621-3027396 NIR 13 47 36.2103904992 -30 27 39.586912020           ~ 1 0
85 [HHM2006] 70 IR 13 47 36.22 -30 22 04.4           ~ 1 0
86 [HHM2006] 72 IR 13 47 37.09 -30 25 17.7           ~ 1 0
87 [HHM2006] 73 AGN 13 47 38.48 -30 26 55.6           ~ 1 0
88 [HHM2006] 74 IR 13 47 38.59 -30 27 01.0           ~ 1 0
89 [HHM2006] 75 IR 13 47 39.09 -30 26 22.4           ~ 1 0
90 LEDA 48911 Sy2 13 47 41.7088081320 -30 21 31.394320056   10.64   14.14 13.64 ~ 22 0
91 NAME IC 4329 Group GrG 13 48 36.4 -30 30 13           ~ 147 2
92 ELAISC15 J142814+333026 EmG 14 28 14.8360855704 +33 30 25.790370408   18.51 17.69 17.12 16.57 ~ 13 0
93 KISS H1430-1039 EmG 14 31 49.3475534976 +35 28 39.928870488   20.02 19.37 18.88 18.39 ~ 7 0
94 NGC 5669 H2G 14 32 43.476 +09 53 25.47   13.2       ~ 213 0
95 NGC 7023 OpC 21 01 36.9 +68 09 48           ~ 739 0
96 HD 200775 Ae* 21 01 36.9205762896 +68 09 47.789578836 7.34 7.754 7.427 8.13   B2Ve 582 0
97 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 480 1
98 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
99 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0
100 NAME Local Group GrG ~ ~           ~ 9325 0
101 [LHC79] G PoG ~ ~           ~ 3 0

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