2014ApJ...784....1K

Query : 2014ApJ...784....1K

2014ApJ...784....1K - Astrophys. J., 784, 1 (2014/March-3)

Shocks and star formation in Stephan's Quintet. I. Gemini spectroscopy of Hα-bright knots.

KONSTANTOPOULOS I.S., APPLETON P.N., GUILLARD P., TRANCHO G., CLUVER M.E., BASTIAN N., CHARLTON J.C., FEDOTOV K., GALLAGHER S.C., SMITH L.J. and STRUCK C.J.

Abstract (from CDS):

We present a Gemini-GMOS spectroscopic study of Hubble Space Telescope (HST)-selected Hα-emitting regions in Stephan's Quintet (HCG 92), a nearby compact galaxy group, with the aim of disentangling the processes of shock-induced heating and star formation in its intra-group medium. The ~40 sources are distributed across the system, but most densely concentrated in the ∼kiloparsec-long shock region. Their spectra neatly divide them into narrow- and broad-line emitters, and we decompose the latter into three or more emission peaks corresponding to spatial elements discernible in HST imaging. The emission-line ratios of the two populations of Hα-emitters confirm their nature as H II regions (90% of the sample) or molecular gas heated by a shock front propagating at ≲ 300 km/s. Their redshift distribution reveals interesting three-dimensional structure with respect to gas-phase baryons, with no H II regions associated with shocked gas, no shocked regions in the intruder galaxy NGC 7318B, and a sharp boundary between shocks and star formation. We conclude that star formation is inhibited substantially, if not entirely, in the shock region. Attributing those H II regions projected against the shock to the intruder, we find a lopsided distribution of star formation in this galaxy, reminiscent of pileup regions in models of interacting galaxies. The Hα luminosities imply mass outputs, star formation rates, and efficiencies similar to nearby star-forming regions. Two large knots are an exception to this, being comparable in stellar output to the prolific 30 Doradus region. We also examine Stephan's Quintet in the context of compact galaxy group evolution, as a paradigm for intermittent star formation histories in the presence of a rich, X-ray-emitting intra-group medium. All spectra are provided as supplemental materials.

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Journal keyword(s): galaxies: groups: individual: HCG 92 - galaxies: individual (NGC 7317, NGC 7318A, NGC 7318B, NGC 7319) - galaxies: interactions - galaxies: star formation - intergalactic medium - shock waves

Nomenclature: Table 1: [KAG2014] NNNNN N=39 among (Nos 10006-60011).

Simbad objects: 49

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Number of rows : 49
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11311 1
2 NGC 604 HII 01 34 32.1 +30 47 01           ~ 588 0
3 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 239 0
4 HCG 42 CGG 10 00 13.1 -19 38 24           ~ 99 0
5 NGC 7317 Sy2 22 35 51.8681746944 +33 56 41.758033380 15.10 14.57 13.60 12.72   ~ 174 1
6 [KAG2014] 30170 HII 22 35 54.384 +33 57 17.02           ~ 1 0
7 [KAG2014] 12014 HII 22 35 55.346 +33 57 11.79           ~ 1 0
8 [KAG2014] 50003 HII 22 35 56.282 +33 56 53.37           ~ 1 0
9 [KAG2014] 50006 HII 22 35 56.366 +33 57 07.48           ~ 1 0
10 [KAG2014] 50009 HII 22 35 56.501 +33 57 19.57           ~ 1 0
11 [KAG2014] 60003 HII 22 35 56.597 +33 58 16.35           ~ 1 0
12 NGC 7318A GiP 22 35 56.85 +33 57 54.3   14.4   13.13   ~ 134 0
13 [KAG2014] 60006 HII 22 35 57.485 +33 58 38.16           ~ 1 0
14 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 442 1
15 [KAG2014] 13006 HII 22 35 57.658 +33 57 35.22           ~ 1 0
16 [KAG2014] 30115 HII 22 35 57.862 +33 59 11.68           ~ 1 0
17 [KAG2014] 30112 HII 22 35 58.008 +33 58 59.71           ~ 1 0
18 [KAG2014] 50001 HII 22 35 58.068 +33 56 45.48           ~ 1 0
19 [KAG2014] 50007 HII 22 35 58.157 +33 57 09.65           ~ 1 0
20 [KAG2014] 60011 HII 22 35 58.284 +33 58 48.17           ~ 1 0
21 NGC 7318B GiP 22 35 58.3903354632 +33 57 57.827617524   14.06   12.47   ~ 138 0
22 [KAG2014] 12013 HII 22 35 58.392 +33 57 31.73           ~ 1 0
23 [KAG2014] 30093 HII 22 35 58.658 +33 57 43.95           ~ 1 0
24 [KAG2014] 14002 HII 22 35 58.788 +33 58 32.09           ~ 1 0
25 [KAG2014] 30109 HII 22 35 58.910 +33 58 49.92           ~ 1 0
26 [KAG2014] 12005 HII 22 35 59.126 +33 58 36.24           ~ 1 0
27 [KAG2014] 30113 HII 22 35 59.138 +33 59 00.20           ~ 1 0
28 [KAG2014] 30174 HII 22 35 59.194 +33 58 47.04           ~ 1 0
29 [KAG2014] 10006 HII 22 35 59.196 +33 57 33.98           ~ 1 0
30 [KAG2014] 30139 HII 22 35 59.256 +33 59 06.02           ~ 1 0
31 [KAG2014] 13001 HII 22 35 59.309 +33 58 15.08           ~ 1 0
32 [KAG2014] 14006 HII 22 35 59.532 +33 58 32.80           ~ 1 0
33 [KAG2014] 30162 HII 22 35 59.798 +33 57 39.35           ~ 1 0
34 [KAG2014] 15057 HII 22 35 59.798 +33 58 16.73           ~ 1 0
35 [KAG2014] 13011 HII 22 35 59.803 +33 58 08.53           ~ 1 0
36 [KAG2014] 15053 HII 22 35 59.856 +33 58 20.69           ~ 1 0
37 [KAG2014] 12004 HII 22 35 59.890 +33 58 26.76           ~ 1 0
38 [KAG2014] 13003 HII 22 35 59.930 +33 57 47.36           ~ 1 0
39 [KAG2014] 12018 HII 22 36 00.029 +33 57 46.49           ~ 1 0
40 [KAG2014] 12002 HII 22 36 00.043 +33 58 06.74           ~ 1 0
41 [KAG2014] 12015 HII 22 36 00.094 +33 57 58.82           ~ 1 0
42 [KAG2014] 11002 HII 22 36 00.185 +33 57 52.52           ~ 1 0
43 [KAG2014] 12010 HII 22 36 00.550 +33 57 56.66           ~ 1 0
44 [KAG2014] 14030 HII 22 36 00.653 +33 58 07.16           ~ 1 0
45 [KAG2014] 20001 HII 22 36 01.219 +33 58 22.61           ~ 1 0
46 [KAG2014] 20002 HII 22 36 02.150 +33 58 25.64           ~ 1 0
47 NGC 7319 Sy2 22 36 03.602 +33 58 33.18   14.57 13.53 12.65   ~ 296 0
48 [KAG2014] 30116 HII 22 36 07.567 +33 59 21.37           ~ 1 0
49 NGC 7320C AG? 22 36 20.3659207800 +33 59 06.140904000   17       ~ 49 0

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