2013ApJ...770..158M

Query : 2013ApJ...770..158M

2013ApJ...770..158M - Astrophys. J., 770, 158 (2013/June-3)

Gemini spectroscopy of ultracompact dwarfs in the fossil group NGC 1132.

MADRID J.P. and DONZELLI C.J.

Abstract (from CDS):

A spectroscopic follow-up of ultracompact dwarf (UCD) candidates in the fossil group NGC 1132 is undertaken with the Gemini Multi Object Spectrograph. These new Gemini spectra prove the presence of six UCDs in the fossil group NGC 1132 at a distance of D ∼ 100 Mpc and a recessional velocity of vr = 6935±11 km/s. The brightest and largest member of the UCD population is an M32 analog with a size of 77.1 pc and a magnitude of MV= -14.8 mag with the characteristics in between those of the brightest UCDs and compact elliptical galaxies. The ensemble of UCDs have an average radial velocity of < vr > = 6966±208 km/s and a velocity dispersion of σ_ v_= 169±18 km/s similar to the one of poor galaxy groups. This work shows that UCDs can be used as test particles to determine the dynamical properties of galaxy groups. The presence of UCDs in the fossil group environment is confirmed and thus the fact that UCDs can form across diverse evolutionary conditions.

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Journal keyword(s): galaxies: clusters: general - galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: groups: general - galaxies: star clusters: general

Nomenclature: Table 2: [MD2013] UCDN (Nos UCD1-UCD6), [MD2013] GC1 N=1.

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 RX J0153.2+0102 ClG 01 53 15.15 +01 02 18.8           ~ 15 0
3 [MD2013] UCD6 G 02 52 51.0 -01 16 06           ~ 1 0
4 [MD2013] UCD1 * 02 52 51.1669019112 -01 16 18.848046612           ~ 4 0
5 NAME NGC 1132 Group GrG 02 52 51.8 -01 16 29           ~ 9 0
6 NGC 1132 EmG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 180 0
7 [MD2013] UCD4 G 02 52 52.0 -01 15 43           ~ 1 0
8 [MD2013] GC1 GlC 02 52 53.0 -01 16 34           ~ 1 0
9 [MD2013] UCD2 G 02 52 54.0 -01 17 39           ~ 1 0
10 [MD2013] UCD5 G 02 52 55.0 -01 17 19           ~ 1 0
11 [MD2013] UCD3 G 02 52 59.0 -01 14 54           ~ 1 0
12 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
13 HCG 31 CGG 05 01 37 -04 15.4           ~ 132 0
14 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
15 [CTM2010] 121666 G 12 59 39.1623 +28 01 11.232       21.65 21.68 ~ 5 0
16 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
17 HCG 79 CGG 15 59 11.605 +20 45 24.66           ~ 117 0
18 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0

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