2006AJ....131..312J


Query : 2006AJ....131..312J

2006AJ....131..312J - Astron. J., 131, 312-324 (2006/January-0)

Discovery of ultracompact dwarf galaxies in the Virgo cluster.

JONES J.B., DRINKWATER M.J., JUREK R., PHILLIPPS S., GREGG M.D., BEKKI K., COUCH W.J., KARICK A., PARKER Q.A. and SMITH R.M.

Abstract (from CDS):

We have discovered nine ultracompact dwarf galaxies (UCDs) in the Virgo Cluster, extending samples of these objects outside the Fornax Cluster. Using the Two Degree Field (2dF) multifiber spectrograph on the Anglo-Australian Telescope, the new Virgo members were found among 1500 color-selected, starlike targets with 16.0<bj<20.2 in a 2° diameter field centered on M87 (NGC 4486). The newly found UCDs are comparable to the UCDs in the Fornax Cluster, with sizes ≲100 pc, -12.9<MB←10.7, and exhibiting red absorption-line spectra, indicative of an older stellar population. The properties of these objects remain consistent with the tidal threshing model for the origin of UCDs from the surviving nuclei of nucleated dwarf elliptical galaxies disrupted in the cluster core but can also be explained as objects that were formed by mergers of star clusters created in galaxy interactions. The discovery that UCDs exist in Virgo shows that this galaxy type is probably a ubiquitous phenomenon in clusters of galaxies; coupled with their possible origin by tidal threshing, the UCD population is a potential indicator and probe of the formation history of a given cluster. We also describe one additional bright UCD with MB=-12.0 in the core of the Fornax Cluster. We find no further UCDs in our Fornax Cluster Spectroscopic Survey down to bj=19.5 in two additional 2dF fields extending as far as 3° from the center of the cluster. All six Fornax bright UCDs identified with 2dF lie within 0°.5 (projected distance of 170 kpc) of the central elliptical galaxy NGC 1399.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Name: Fornax - Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Distances and Redshifts - Galaxies: Dwarf - Galaxies: Peculiar - Surveys

Nomenclature: Table 2: [JDJ2006] N (Nos 1-9) = VCO JHHMMSS.s+DDMMSS N=9.

Simbad objects: 22

goto Full paper

goto View the references in ADS

Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2060 2
2 NAME UCD-FORS 32 GiC 03 38 05.0524347451 -35 24 09.332470569   19.7 19.15   18.02 ~ 17 0
3 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1490 1
4 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1649 0
5 2MASS J03385407-3533331 GiC 03 38 54.0548295896 -35 33 33.352307509   18.5 18.06     ~ 69 0
6 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6130 0
7 NGVS J123007.57+123631.0 GlC 12 30 07.5690843498 +12 36 30.996360221           ~ 25 0
8 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 394 0
9 NGVS J123048.19+123510.7 GlC 12 30 48.1979481876 +12 35 10.877959048           ~ 17 0
10 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6528 3
11 [JDJ2006] 3 G 12 30 57.3833546242 +12 25 44.499140903   19.32 17.97     ~ 45 0
12 [JDJ2006] 4 GlC 12 31 04.4757913483 +11 56 36.488486778           ~ 22 0
13 [JDJ2006] 5 GlC 12 31 11.8766910181 +12 41 01.081447941           ~ 27 0
14 NGVS J123128.36+122503.6 GlC 12 31 28.3597374413 +12 25 03.599290701           ~ 23 0
15 2MASS J12315289+1215589 G 12 31 52.8978463348 +12 15 59.053574946           ~ 43 0
16 NGVS J123204.35+122030.3 GlC 12 32 04.3488556303 +12 20 30.292024815           ~ 16 0
17 NGVS J123214.58+120305.3 GlC 12 32 14.5785201733 +12 03 05.286514594           ~ 12 0
18 LEDA 42141 LSB 12 37 24.94056 +14 18 45.4104   19       ~ 13 0
19 LEDA 42320 GiC 12 39 13.471 +12 06 02.64   19     16.9 ~ 14 0
20 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1053 0
21 [WSL93] 3 GlC 22 20 43.878 -24 40 37.87     17.86     ~ 50 0
22 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 675 1

To bookmark this query, right click on this link: simbad:objects in 2006AJ....131..312J and select 'bookmark this link' or equivalent in the popup menu


2021.12.04-15:02:42

© Université de Strasbourg/CNRS

    • Contact