2002A&A...396..815V


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET21:11:31

2002A&A...396..815V - Astronomy and Astrophysics, volume 396, 815-832 (2002/12-4)

Ripples and tails in the compact group of galaxies Hickson 54.

VERDES-MONTENEGRO L., DEL OLMO A., IGLESIAS-PARAMO J.I., PEREA J., VILCHEZ J.M., YUN M.S. and HUCHTMEIER W.K.

Abstract (from CDS):

HCG 54 has been classified as a compact galaxy group by Hickson, but its nature is uncertain because of its unusual properties. We present here a study of HCG 54 based on deep optical images and spectroscopy as well as high spatial and spectral resolution HI observations obtained at the VLA. Both optical and radio data indicate clearly that HCG 54 is a product of a recent merger involving at least two galaxies. Our optical images have revealed a blue elongated structure associated with HCG 54a embedded in a rounder and redder stellar envelope. Several ripples or shells whose center is located near HCG 54a and b are also detected. These observed features are similar to those found in the numerical simulations of tidal interactions involving two equal mass disk galaxies. This system is embedded in an HI cloud 12kpc in diameter, and a 20kpc HI tidal tail emerges from its western edge. Both the HI distribution and kinematics are consistent with a recent history of a deeply penetrating interaction or a merger. Based on the analysis of our new data we propose that HCG 54 is the remnant of a merger in an advanced stage, whose main body is what has been called HCG 54a, while HCG 54b marks the location of a strong starburst induced by the interaction, as evidenced by the Wolf Rayet stellar population that we detect. Optical spectra of HCG 54c and d show HII region features and are interpreted as tidal debris of the collision undergoing active star formation.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - galaxies: kinematics and dynamics - galaxies: evolution - galaxies: structure - radio lines: galaxies - galaxies: individual: HCG 54

Nomenclature: Fig.1: [VDI2002] AHHMM+DDMM N=3. Fig.2: [VDI2002] aN (Nos k, t1-t4).

CDS comments: PG 1047 = PG 1047+003.

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 UGC 957 GiC 01 24 24.46 +03 52 55.0   18       ~ 37 2
2 NGC 520 IG 01 24 35.071 +03 47 32.68 12.41 12.24 11.42     ~ 495 3
3 UGC 2140 IG 02 39 06.10 +18 23 02.0   14.6       ~ 44 0
4 PG 0918+029 HS* 09 21 28.2141418281 +02 46 02.253964445 11.975 13.056 13.327 13.456 13.615 sdB1VIIHe6 102 0
5 NGC 3310 AGN 10 38 45.857 +53 30 11.89   12.45 12.15     ~ 738 1
6 V* UY Sex HS* 10 50 02.8264873492 -00 00 36.880346331 12.063 13.184 13.474 13.606 13.769 sdO9VIIHe6 151 0
7 [VDI2002] t4 ? 11 29 10.5 +20 34 05           ~ 1 0
8 [VDI2002] t2 ? 11 29 11.1 +20 35 18           ~ 1 0
9 [VDI2002] t1 ? 11 29 12.3 +20 34 58           ~ 1 0
10 [VDI2002] k ? 11 29 13.1 +20 35 28           ~ 1 0
11 LEDA 35380 EmG 11 29 14.1692496029 +20 34 52.188589618   16.38   15.55   ~ 30 0
12 HCG 54 CGG 11 29 15 +20 34.7           ~ 49 0
13 IC 700 GiG 11 29 15.2996300893 +20 34 59.388494556   14.16   13.94   ~ 41 0
14 LEDA 35384 GiG 11 29 16.28 +20 35 11.3   17.05   16.24   ~ 22 0
15 LEDA 35385 GiC 11 29 16.52 +20 35 19.0   18.26   17.85   ~ 20 0
16 [VDI2002] t3 ? 11 29 18.7 +20 35 02           ~ 1 0
17 USNO-A2.0 1050-06512547 G 11 29 21.253 +20 35 23.87           ~ 3 0
18 [VDI2002] A1127+2054 G 11 29 28.4 +20 37 56           ~ 2 0
19 2MASX J11295416+2040437 G 11 29 54.1202481615 +20 40 43.646836395           ~ 2 0
20 NGC 7673 EmG 23 27 41.060 +23 35 20.18 12.84 13.17 12.76     ~ 264 1

    Equat.    Gal    SGal    Ecl

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