2007A&A...475..187D


Query : 2007A&A...475..187D

2007A&A...475..187D - Astronomy and Astrophysics, volume 475, 187-197 (2007/11-3)

VCC 2062: an old tidal dwarf galaxy in the Virgo cluster?

DUC P.-A., BRAINE J., LISENFELD U., BRINKS E. and BOQUIEN M.

Abstract (from CDS):

Numerical simulations predict the existence of old Tidal Dwarf Galaxies (TDGs) that would have survived several Gyr after the collision lying at their origin. Such survivors, which would by now have become independent relaxed galaxies, would be ideal laboratories, if nearby enough, to tackle a number of topical issues, including the distribution of Dark Matter in and around galaxies. However finding old dwarf galaxies with a confirmed tidal origin is an observational challenge. A dwarf galaxy in the nearby Virgo Cluster, VCC 2062, exhibits several unusual properties that are typical of a galaxy made out of recycled material. We discuss whether it may indeed be a TDG. We analysed multi-wavelength observations of VCC 2062, including a CO map acquired with the IRAM 30m dish, an optical spectrum of its HII regions, GALEX ultraviolet and archival broad-band and narrow-band optical images as well as a VLA HI datacube, originally obtained as part of the VIVA project. VCC 2062 appears to be the optical, low surface brightness counterpart of a kinematically detached, rotating condensation that formed within an HI tail apparently physically linked to the disturbed galaxy NGC 4694. In contrast to its faint optical luminosity, VCC 2062 is characterised by strong CO emission and a high oxygen abundance more typical of spiral disks. Its dynamical mass however, is that of a dwarf galaxy. VCC 2062 was most likely formed within a pre-enriched gaseous structure expelled from a larger galaxy as a result of a tidal interaction. The natural provider for the gaseous tail is NGC 4694 or rather a former companion which subsequently has been accreted by the massive galaxy. According to that scenario, VCC 2062 has been formed by a past tidal encounter. Since its parent galaxies have most probably already totally merged, it qualifies as an old Tidal Dwarf Galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - galaxies: peculiar - galaxies: dwarf - galaxies: clusters: individual: VCC 2062 - galaxies: individual: NGC 4694 - ISM: molecules

Simbad objects: 31

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Number of rows : 31
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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11375 1
2 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4070 5
3 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5470 6
4 UGC 5336 G 09 57 32.1 +69 02 46 15.19 15.15 14.10 14.12   ~ 296 4
5 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 705 0
6 NAME Garland G 10 03 43.1 +68 41 32           ~ 54 2
7 NGC 4038 GiP 12 01 53.002 -18 52 03.32   10.91   9.74 11.0 ~ 1289 1
8 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1589 0
9 NGC 4039 GiP 12 01 53.8 -18 53 06   11.08   9.77   ~ 1138 1
10 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 802 2
11 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1229 2
12 NGC 4402 GiP 12 26 07.65312 +13 06 47.9376   12.55       M0 369 1
13 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1026 1
14 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6071 0
15 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 419 2
16 NGC 4438 LIN 12 27 45.652 +13 00 30.92 11.37 11.02 10.17     ~ 595 3
17 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6447 3
18 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 338 0
19 NGC 4567 GiP 12 36 32.701 +11 15 28.69 12.25 12.06 11.31     ~ 298 2
20 NGC 4568 GiP 12 36 34.292 +11 14 19.07   12.11 11.19     ~ 355 2
21 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 996 2
22 M 60 GiP 12 43 40.008 +11 33 09.40   10.3       ~ 1276 0
23 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 518 1
24 NGC 4660 GiP 12 44 31.9848549289 +11 11 25.730688043   12.1       ~ 401 0
25 LEDA 43211 LSB 12 47 59.922 +10 58 14.89   21       ~ 67 0
26 NGC 4694 AGN 12 48 15.091 +10 59 01.05   13.93 13.36     ~ 252 0
27 NGC 4733 GiP 12 51 06.7716823824 +10 54 43.485838471   13.2       ~ 132 0
28 NGC 4754 GiP 12 52 17.563 +11 18 49.18   11.6       ~ 266 0
29 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3889 2
30 NGC 5291 AGN 13 47 24.459 -30 24 25.03   15.18 14.00 13.57 12.7 ~ 144 1
31 NAME Local Group GrG ~ ~           ~ 7318 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-17:28:24

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