2003A&A...397...99R


Query : 2003A&A...397...99R

2003A&A...397...99R - Astronomy and Astrophysics, volume 397, 99-107 (2003/1-1)

Is HCG 31 undergoing a merger or a fly-by interaction?

RICHER M.G., GEORGIEV L., ROSADO M., BULLEJOS A., VALDEZ-GUTIERREZ M. and DULTZIN-HACYAN D.

Abstract (from CDS):

We present Fabry-Perot and multi-object spectroscopy of the galaxies in Hickson compact group 31 (HCG 31). Based upon our Hα data cubes, galaxies A and C are a single entity, showing no discontinuity in their kinematics. Kinematically, galaxy E is probably a component of the A+C complex; otherwise it is a recently detached fragment. Galaxy F appears, both kinematically and chemically, to have formed from material tidally removed from the A+C complex. Galaxies B and G are kinematically distinct from this complex. Galaxy Q also has a radial velocity compatible with group membership. Galaxies A, B, C, and F have nearly identical oxygen abundances, despite spanning a luminosity range of 5mag. Galaxy B's oxygen abundance is normal for its luminosity, while galaxy F's abundance is that expected given its origin as a tidal fragment of the A+C complex. The oxygen abundances in galaxies A and C are also understandable if the A+C complex is a late-type spiral suffering strong gas inflow and star formation as a result of a tidal interaction. Given the kinematics of both the galaxies and the HI gas, the oxygen abundances, and the position of galaxy G, we propose that an interaction of galaxy G with the A+C complex, rather than a merger of galaxies A and C, is a more complete explanation for the tidal features and other properties of HCG 31. In this case, the A+C complex need not be a merger in progress, though this is not ruled out.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: formation - galaxies: individual: NGC 1741 - galaxies: clusters: individual: HCG 31

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HCG 16 CGG 02 09 40.82 -10 11 02.0           ~ 163 0
2 HD 19445 PM* 03 08 25.5883873084 +26 19 51.400965175 8.29 8.52 8.06 7.60 7.27 G2VFe-3 756 0
3 HCG 26 CGG 03 21 54 -13 38.8           ~ 34 0
4 LEDA 16571 G 05 01 35.3 -04 15 24   18.53   17.06   ~ 27 0
5 2MFGC 4113 G 05 01 35.550 -04 15 47.42   15.35   14.73   ~ 60 0
6 HCG 31 CGG 05 01 37 -04 15.4           ~ 127 0
7 HCG 31e G 05 01 37.5 -04 15 57           ~ 24 0
8 2MASX J05013782-0415294 G 05 01 37.832 -04 15 28.48   13.44   12.76   ~ 69 1
9 NGC 1741 IG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 253 0
10 LEDA 3092704 GiG 05 01 38.3 -04 13 21           ~ 20 0
11 HCG 31f G 05 01 40.0 -04 16 22           ~ 20 0
12 IC 399 EmG 05 01 44.0604445128 -04 17 19.319048052   15.0 14.8     ~ 66 0
13 HD 74721 HB* 08 45 59.2614567408 +13 15 48.591616392 8.88 8.75 8.72     A0V 144 0
14 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6340 0
15 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 2036 2
16 UGC 7636 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 125 0
17 HD 109995 HB* 12 38 47.5985869392 +39 18 31.626312732 7.83 7.68   7.6   A0V 219 0
18 NAME Stephan's Quintet CGG 22 35 57.5 +33 57 36           ~ 403 1
19 NGC 7318B GiP 22 35 58.3903354632 +33 57 57.827617524   14.06   12.47   ~ 131 0

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2022.11.29-16:58:53

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