2014ApJ...787..103H

Query : 2014ApJ...787..103H

2014ApJ...787..103H - Astrophys. J., 787, 103 (2014/June-1)

Star formation And the Interstellar medium in Nearby Tidal Streams (SAINTS): Spitzer mid-infrared spectroscopy and imaging of intergalactic star-forming objects.

HIGDON S.J.U., HIGDON J.L., SMITH B.J. and HANCOCK M.

Abstract (from CDS):

A spectroscopic analysis of 10 intergalactic star-forming objects (ISFOs) and a photometric analysis of 67 ISFOs in a sample of 14 interacting systems is presented. The majority of the ISFOs have relative polycyclic aromatic hydrocarbon (PAH) band strengths similar to those of nearby spiral and starburst galaxies. In contrast to what is observed in blue compact dwarfs (BCDs) and local giant H II regions in the Milky Way (NGC 3603) and the Magellanic Clouds (30 Doradus and N 66), the relative PAH band strengths in ISFOs correspond to models with a significant PAH ion fraction (<50%) and bright emission from large PAHs (∼100 carbon atoms). The [Ne III]/[Ne II] and [S IV]/[S III] line flux ratios indicate moderate levels of excitation with an interstellar radiation field that is harder than the majority of the Spitzer Infrared Nearby Galaxies Survey and starburst galaxies, but softer than BCDs and local giant H II regions. The ISFO neon line flux ratios are consistent with a burst of star formation ≲ 6 million years ago. Most of the ISFOs have ∼106 M☉ of warm H2with a likely origin in photo-dissociation regions (PDRs). Infrared Array Camera photometry shows the ISFOs to be bright at 8 µm, with one-third having [4.5] - [8.0] > 3.7, i.e., enhanced non-stellar emission, most likely due to PAHs, relative to normal spirals, dwarf irregulars, and BCD galaxies. The relative strength of the 8 µm emission compared to that at 3.6 µm or 24 µm separates ISFOs from dwarf galaxies in Spitzer two-color diagrams. The infrared power in two-thirds of the ISFOs is dominated by emission from grains in a diffuse interstellar medium. One in six ISFOs have significant emission from PDRs, contributing ∼30%-60% of the total power. ISFOs are young knots of intense star formation.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: formation - galaxies: individual: (Arp 72, Arp 84, Arp 87, Arp 105, Arp 242, Arp 284, Stephan's Quintet, NGC 5291) - galaxies: interactions - infrared: galaxies

Nomenclature: Table 1: [HHS2014] ArpNNN AN N=38, [HHS2014] Arp107 SW1 N=1, [HHS2014] Arp284 AAN N=2 (Nos SW1 to SW2), [HHS2014] SQ A N=2 (Nos A and B), [HHS2014] NGC5291 NN N=24 (Nos 13 to 51).

Simbad objects: 124

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Number of rows : 124
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 [HHS2014] Arp65 N1 SFR 00 21 47.74 +22 24 55.9           ~ 1 0
2 [HHS2014] Arp65 N2 SFR 00 21 49.43 +22 24 41.2           ~ 1 0
3 [HHS2014] Arp65 N3 SFR 00 21 50.18 +22 24 34.5           ~ 1 0
4 [HHS2014] Arp65 N4 SFR 00 21 50.74 +22 24 26.3           ~ 1 0
5 [HHS2014] Arp65 S1 SFR 00 21 51.53 +22 23 38.4           ~ 1 0
6 [HHS2014] Arp65 S3 SFR 00 21 53.14 +22 23 27.9           ~ 1 0
7 [HHS2014] Arp65 S2 SFR 00 21 53.48 +22 23 27.9           ~ 1 0
8 APG 65 IG 00 21.9 +22 23           ~ 17 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
10 Mrk 996 Sy1 01 27 35.5248944352 -06 19 35.432857848 14.75 15.05 14.48 14.06 13.70 ~ 136 0
11 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
14 SV* HV 5967 PN 05 36 20.7215081304 -67 18 07.658262756 15.56 16.225 14.948   16.558 [WN4.5:] 147 0
15 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
16 NGC 2335 OpC 07 06 45.8 -10 01 00   7.76 7.2     ~ 92 0
17 NGC 2444 AG? 07 46 53.0555407896 +39 01 55.100891208   13.1       ~ 110 1
18 [HHS2014] Arp82 S1 SFR 08 11 12.56 +25 11 40.9           ~ 1 0
19 [HHS2014] Arp82 S2 SFR 08 11 12.97 +25 11 25.7           ~ 1 0
20 [HHS2014] Arp82 S3 SFR 08 11 13.06 +25 11 21.2           ~ 1 0
21 [HHS2014] Arp82 N1 HII 08 11 13.9490080776 +25 13 09.575232564           ~ 2 0
22 APG 82 PaG 08 11 14.0 +25 12 25           ~ 146 0
23 [HHS2014] Arp82 S4 SFR 08 11 14.02 +25 11 13.8           ~ 1 0
24 NGC 2536 GiG 08 11 15.9239979960 +25 10 45.549680232   14.8 13.93     ~ 96 0
25 NGC 2854 GiG 09 24 03.15673 +49 12 15.6710   13.82       ~ 109 2
26 APG 285 GrG 09 24.1 +49 13           ~ 55 0
27 NGC 2856 GiG 09 24 16.0155478176 +49 14 57.076425384   14.10       ~ 92 2
28 [HHS2014] Arp285 N1 SFR 09 24 18.49 +49 15 18.6           ~ 1 0
29 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
30 NGC 3189 GiP 10 18 05.643 +21 49 54.98 12.60 12.12 11.15 11.14   ~ 422 2
31 Z 266-55 AGN 10 32 31.956 +54 24 03.53 13.29 13.66 13.13 12.71 12.27 ~ 381 1
32 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
33 [HHS2014] Arp107 N1 SFR 10 52 12.63 +30 04 21.5           ~ 1 0
34 [HHS2014] Arp107 SW1 SFR 10 52 12.82 +30 03 49.6           ~ 1 0
35 [HHS2014] Arp107 E1 SFR 10 52 14.78 +30 04 06.5           ~ 1 0
36 Z 155-31 Sy2 10 52 14.9479088736 +30 03 28.370430468   14.6       ~ 76 0
37 APG 24 G 10 54 40.1 +56 59 11           ~ 80 0
38 ACO 1185 ClG 11 10 32.15 +28 35 50.4           ~ 271 1
39 [HHS2014] Arp105 N2 SFR 11 11 12.59 +28 45 37.6           ~ 1 0
40 [HHS2014] Arp105 N1 SFR 11 11 12.68 +28 45 55.0           ~ 3 0
41 NGC 3561A GiC 11 11 13.0419775539 +28 42 42.744633151   14.7       ~ 76 1
42 NGC 3561 LIN 11 11 13.1887412409 +28 41 47.044176908   14.7       ~ 202 2
43 [HHS2014] Arp105 S1 SFR 11 11 13.37 +28 41 24.6           ~ 1 0
44 NAME Ambartsumian's Knot G 11 11 13.424 +28 41 16.17   18.5       ~ 13 2
45 [BLD2000] A105S G 11 11 13.5 +28 41 20           ~ 11 2
46 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
47 NGC 3690B GiP 11 28 31.02 +58 33 40.7   11.8       ~ 635 4
48 NGC 3808 H2G 11 40 44.2370562648 +22 25 45.516900324   14.1   13.24   ~ 126 2
49 [HHS2014] Arp87 N1 SFR 11 40 45.11 +22 25 58.8           ~ 1 0
50 NGC 4038 EmG 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1364 1
51 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
52 NGC 4039 GiP 12 01 53.51 -18 53 10.3   11.08   9.77   ~ 1173 1
53 Mrk 1315 H2G 12 15 18.5915257128 +20 38 26.666992356   16.5       ~ 57 0
54 NGC 4676 IG 12 46 10.18 +30 43 53.7   14.1       ~ 318 0
55 [HHS2014] Arp242 N8 SFR 12 46 10.33 +30 44 20.8           ~ 1 0
56 [HHS2014] Arp242 N7 SFR 12 46 10.37 +40 44 26.2           ~ 1 0
57 [HHS2014] Arp242 N6 SFR 12 46 10.42 +30 44 34.0           ~ 1 0
58 [HHS2014] NGC5291 33 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
59 [HHS2014] NGC5291 13 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
60 [HHS2014] NGC5291 15 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
61 [HHS2014] NGC5291 16 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
62 [HHS2014] NGC5291 17 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
63 [HHS2014] NGC5291 18 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
64 [HHS2014] NGC5291 19 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
65 [HHS2014] NGC5291 22 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
66 [HHS2014] NGC5291 25 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
67 [HHS2014] NGC5291 26 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
68 [HHS2014] NGC5291 28 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
69 [HHS2014] NGC5291 30 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
70 [HHS2014] NGC5291 31 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
71 [HHS2014] NGC5291 32 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
72 [HHS2014] NGC5291 36 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
73 [HHS2014] NGC5291 39 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
74 [HHS2014] NGC5291 41 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
75 [HHS2014] NGC5291 42 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
76 [HHS2014] NGC5291 43 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
77 [HHS2014] NGC5291 45 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
78 [HHS2014] NGC5291 47 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
79 [HHS2014] NGC5291 49 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
80 [HHS2014] NGC5291 50 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
81 [HHS2014] NGC5291 51 SFR 12 46 10.45 -30 45 31.0           ~ 1 0
82 [HHS2014] Arp242 N2 SFR 12 46 10.45 +30 45 22.6           ~ 1 0
83 [HHS2014] Arp242 N1 SFR 12 46 10.45 +30 45 31.0           ~ 1 0
84 [HHS2014] Arp242 N3 SFR 12 46 10.46 +30 45 12.1           ~ 1 0
85 [HHS2014] Arp242 N5 SFR 12 46 10.46 +30 44 53.2           ~ 1 0
86 [HHS2014] Arp242 N4 SFR 12 46 10.55 +30 45 04.0           ~ 1 0
87 [HHS2014] Arp104 S1 SFR 13 32 01.69 +62 41 32.9           ~ 1 0
88 NGC 5216 Sy2 13 32 06.9115980360 +62 42 02.424417552   16.80 16.14     ~ 137 0
89 NGC 5218 AGN 13 32 10.4297476488 +62 46 04.122362532   13.1       ~ 181 1
90 NAME Keenan's System GrG 13 32.2 +62 44           ~ 73 0
91 NGC 5291B EmG 13 47 23.1864696240 -30 25 04.191653892   16   13.62   ~ 39 1
92 NGC 5291 Sy2 13 47 24.5000261808 -30 24 25.449445800   15.18 14.00 13.57 12.7 ~ 161 1
93 [HHS2014] Arp84 N1 SFR 13 58 33.52 +37 27 42.3           ~ 2 0
94 NGC 5394 H2G 13 58 33.6405096192 +37 27 12.732147036   13.7 13.12     ~ 215 2
95 APG 84 IG 13 58 34.30 +37 27 10.9           ~ 147 0
96 NGC 5395 Sy2 13 58 37.9605982608 +37 25 28.161627744   13.26 12.48     ~ 225 1
97 NGC 5994 GiP 15 46 53.3294445216 +17 52 21.457006356   13.2       ~ 40 0
98 UGC 10033 IG 15 46 56.1 +17 52 42           ~ 118 0
99 [HHS2014] Arp72 S5 SFR 15 46 56.77 +17 52 19.4           ~ 1 0
100 [HHS2014] Arp72 S4 SFR 15 46 57.02 +17 52 22.9           ~ 1 0
101 [HHS2014] Arp72 S2 SFR 15 46 57.02 +17 52 22.1           ~ 1 0
102 [HHS2014] Arp72 S3 SFR 15 46 57.47 +17 52 27.2           ~ 1 0
103 [HHS2014] Arp72 S1 SFR 15 46 58.24 +17 52 32.7           ~ 1 0
104 NGC 5996 H2G 15 46 58.8879549840 +17 53 03.045863148   13.2       ~ 165 0
105 Z 252-40 Bla 17 19 14.4925971408 +48 58 49.423205136   15.86 14.81 9.44   ~ 335 1
106 [HHS2014] Arp102 N2 SFR 17 19 17.14 +49 04 38.7           ~ 1 0
107 [HHS2014] Arp102 N1 SFR 17 19 17.20 +49 04 45.2           ~ 1 0
108 * ksi Dra PM* 17 53 31.7295427958 +56 52 21.510944948 6.14 4.93 3.75 2.92 2.33 K2III 285 0
109 HD 181597 * 19 18 37.8718847472 +49 34 10.037944416   7.442 6.317     K1III 67 0
110 NGC 7252 AGN 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 720 1
111 NGC 7317 Sy2 22 35 51.8681746944 +33 56 41.758033380 15.10 14.57 13.60 12.72   ~ 182 1
112 NGC 7318A GiP 22 35 56.70407 +33 57 55.7710   14.4   13.13   ~ 140 0
113 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 480 1
114 NGC 7318B GiP 22 35 58.3903354632 +33 57 57.827617524   14.06   12.47   ~ 144 0
115 [HHS2014] SQ A SFR 22 35 58.91 +33 58 49.5           ~ 5 0
116 NGC 7320 GiG 22 36 03.4059680280 +33 56 53.623460220 13.12 13.23 12.63 12.38   ~ 204 3
117 NGC 7319 Sy2 22 36 03.602 +33 58 33.18   14.57 13.53 12.65   ~ 325 0
118 [A73] C1 HII 22 36 10.2 +33 57 21           ~ 17 1
119 [HHS2014] Arp284 SW2 SFR 23 36 12.96 +02 09 01.7           ~ 1 0
120 [HHS2014] Arp284 SW1 SFR 23 36 13.37 +02 09 03.7           ~ 1 0
121 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
122 [HHS2014] Arp284 E1 SFR 23 36 18.53 +02 09 26.5           ~ 1 0
123 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0
124 NGC 7715 GiP 23 36 21.768 +02 09 25.30   11.81 12.14     ~ 142 0

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