2002A&A...394..823L


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET01:04:15

2002A&A...394..823L - Astronomy and Astrophysics, volume 394, 823-833 (2002/11-2)

Abundant molecular gas in the intergalactic medium of Stephan's Quintet.

LISENFELD U., BRAINE J., DUC P.-A., LEON S., CHARMANDARIS V. and BRINKS E.

Abstract (from CDS):

Stephan's Quintet (SQ) is a system consisting of at least four interacting galaxies which is well known for its complex dynamical and star formation history. It possesses a rich intergalactic medium (IGM), where hydrogen clouds, both atomic and molecular, associated with two starbursts (refered to as SQ A and B) have been found. In order to study the extent, origin and fate of the intergalactic molecular gas and its relation to the formation of stars outside galaxies and Tidal Dwarf Galaxies (TDGs), we mapped with the IRAM 30 m antenna the carbon monoxide (CO) towards several regions of the IGM in SQ. In both SQ A and B, we detected unusually large amounts of molecular gas (3.1x109M and 7x108M, respectively). In contrast, no significant CO detection was achieved towards HII regions south of the pair NGC 7318a/b despite their high Hα luminosities. The molecular gas is very extended in both SQ A and SQ B, over areas of between 15 and 25kpc. The CO clouds seem to have otherwise different properties and may be of a different nature. The integrated CO line of SQ A is in particular much wider than in SQ B. Its CO spectrum shows emission at two velocities (6000 and 6700km/s) that are coincident with two HI lines. The strongest emission at 6000km/s is however spatially offset from the HI emission and situated on a ridge south-east of the starburst region. In SQ B the CO emission coincides with that of tracers of star formation (Hα, 15 µm and radio continuum). The CO peak lies slightly offset from the HI peak towards a steep HI gradient. This is indicating that the molecular gas is forming in-situ, possibly in a region of compressed HI, with subsequent star formation. The star forming region at SQ B is the object in SQ that most resembles a TDG.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: Stephan's Quintet - galaxies: individual: NGC 7319, NGC 7318b - interaction - galaxies: ISM - intergalactic medium galaxies:

CDS comments: NGC 7318 a,b = NGC 7318 A,B. NGC 7320c = NGC 7320C. SQ A,B, C = [XST99] Source A,B,C. SQ CNN = [PMA99b] NN.

Simbad objects: 27

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Number of rows : 27

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1857 1
2 NGC 7317 Sy2 22 35 51.8681756144 +33 56 41.758762990 15.10 14.57 13.60 12.72   ~ 157 1
3 NGC 7318A GiP 22 35 56.85 +33 57 54.3   14.4   13.13   ~ 121 0
4 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 374 1
5 NGC 7318B GiP 22 35 58.3906020031 +33 57 57.832811083   14.06   12.47   ~ 122 0
6 GPM 339.009628+33.999271 * 22 36 02.3509542463 +33 59 57.402171709   13.0 12.2     ~ 6 0
7 NGC 7320 GiG 22 36 03.4063163619 +33 56 53.630500863 13.12 13.23 12.63 12.38   ~ 170 3
8 NGC 7319 Sy2 22 36 03.602 +33 58 33.18   14.57 13.53 12.65   ~ 250 0
9 [A73] C1 HII 22 36 10.2 +33 57 21           ~ 11 1
10 NGC 7320C G 22 36 20.3667448361 +33 59 06.166668958   17       ~ 42 0
11 [XST99] Source A HII 23 35 58.7 +33 58 55           ~ 10 1
12 [GCH2001] 135 Cl* ~ ~           ~ 1 0
13 [GCH2001] 137 Cl* ~ ~           ~ 1 0
14 [A73] B15 HII ~ ~           ~ 4 0
15 [GCH2001] 128 Cl* ~ ~           ~ 1 0
16 [GCH2001] 130 Cl* ~ ~           ~ 1 0
17 [GCH2001] 122 Cl* ~ ~           ~ 1 0
18 [A73] B16 HII ~ ~           ~ 4 0
19 [A73] B17 HII ~ ~           ~ 4 0
20 [A73] B18 HII ~ ~           ~ 4 0
21 [PMA99b] 22 EmO ~ ~           ~ 4 0
22 [GCH2001] 117 EmO ~ ~           ~ 4 0
23 [PMA99b] 8 EmO ~ ~           ~ 4 0
24 [PMA99b] 16 EmO ~ ~           ~ 4 0
25 [PMA99b] 17 EmO ~ ~           ~ 4 0
26 [GCH2001] 133 Cl* ~ ~           ~ 1 0
27 [GCH2001] 134 Cl* ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.11.18-01:04:15

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