2019A&A...625A..50F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST12:25:41

2019A&A...625A..50F - Astronomy and Astrophysics, volume 625A, 50-50 (2019/5-1)

Single metal-poor ultra compact dwarf galaxy at one kiloparsec distance from the low-mass elliptical galaxy FCC 47.

FAHRION K., GEORGIEV I., HILKER M., LYUBENOVA M., VAN DE VEN G., ALFARO-CUELLO M., CORSINI E.M., SARZI M., McDERMID R.M. and DE ZEEUW T.

Abstract (from CDS):


Context. Photometric surveys of galaxy clusters have revealed a large number of ultra compact dwarfs (UCDs) around predominantly massive elliptical galaxies. Their origin is still debated as some UCDs are considered to be the remnant nuclei of stripped dwarf galaxies while others seem to mark the high-mass end of the star cluster population.
Aims. We aim to characterize the properties of a UCD found at very close projected distance (rwproj=1.1kpc) from the centre of the low-mass (M∼1010M) early-type galaxy FCC 47. This is a serendipitous discovery from MUSE adaptive optics science verification data. We explore the potential origin of this UCD as either a massive cluster or the remnant nucleus of a dissolved galaxy.
Methods. We used archival Hubble Space Telescope data to study the photometric and structural properties of FCC 47-UCD1. In the MUSE data, the UCD is unresolved, but we used its spectrum to determine the radial velocity and metallicity.
Results. The surface brightness of FCC 47-UCD1 is best described by a single King profile with low concentration C=Rt/Rc∼10 and large effective radius (reff=24pc). Its integrated magnitude and blue colour (Mg=-10.55mag, (g-z)=1.46mag) combined with a metallicity of [M/H]=-1.12±0.10dex and an age >8Gyr obtained from the full fitting of the MUSE spectrum suggests a stellar population mass of M*=4.87x106M. The low S/N of the MUSE spectrum prevents detailed stellar population analysis. Due to the limited spectral resolution of MUSE, we can only give an upper limit on the velocity dispersion (σ<17km/s), and consequently on its dynamical mass (Mdyn<1.3x107M).
Conclusions. The origin of the UCD cannot be constrained with certainty. The low metallicity, old age, and magnitude are consistent with a star cluster origin, whereas the extended size is consistent with an origin as the stripped nucleus of a dwarf galaxy with a initial stellar mass of a few 108M.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: individual: NGC 1336 - galaxies: dwarf - galaxies: nuclei - galaxies: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/625/A50): tableb1.dat>

Nomenclature: [FGH2019] FCC 47-UCD1 N=1.

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 38

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Number of rows : 38

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10905 1
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 962 3
3 ESO 301-8 GiC 03 22 22.92 -37 23 50.3   15.59   14.41   ~ 30 0
4 NGC 1336 GiG 03 26 32.199 -35 42 48.86   13.12   11.95   ~ 106 0
5 [FGH2019] FCC 47-UCD1 G 03 26 32.920 -35 42 56.10           ~ 2 0
6 6dFGS gJ033147.6-350305 GiC 03 31 47.67 -35 03 05.5   15.27       ~ 42 0
7 NGC 1396 GiG 03 38 06.5660885410 -35 26 23.636856735   14.80       ~ 78 1
8 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1449 1
9 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
10 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 671 1
11 2MASS J03385407-3533331 GiC 03 38 54.0548295896 -35 33 33.352307509   18.5 18.06     ~ 68 0
12 NGC 1400 EmG 03 39 30.851 -18 41 17.25 12.48 12.01 10.96 10.45   ~ 280 1
13 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 128 0
14 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 152 0
15 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3965 5
16 [NK2011] NGC 3923 UCD2 GlC 11 50 55.90 -28 48 18.4           ~ 9 0
17 NGC 3923 GiG 11 51 01.783 -28 48 22.36 11.41 10.59 9.80 8.88   ~ 399 1
18 [NK2011] NGC 3923 UCD3c GlC 11 51 05.20 -28 48 58.9           ~ 7 0
19 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2115 3
20 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5825 0
21 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1959 2
22 [CHA90] 114 G 12 30 45.91 +12 25 01.5   20.77 20.11     ~ 25 0
23 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6213 3
24 NGC 4546 GiG 12 35 29.506 -03 47 35.62 11.89 11.30 10.32     ~ 202 1
25 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1275 3
26 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 656 0
27 M 60 GiP 12 43 40.008 +11 33 09.40   10.3       ~ 1251 0
28 NGC 4696 BiC 12 48 49.277 -41 18 39.92   11.21   10.7   ~ 455 3
29 NAME Cen 30 ClG 12 48 51.7 -41 18 21           ~ 57 0
30 NAME Cen 45 GrG 12 50 -41.3           ~ 44 0
31 NGC 4709 GiG 12 50 03.948 -41 22 55.46   12.48 11.32 10.89   ~ 118 0
32 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
33 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 3999 3
34 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
35 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1738 2
36 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 898 0
37 NGC 7252 IG 22 20 44.7751096408 -24 40 41.905677809 12.26 12.46 12.06 11.57   ~ 663 1
38 NGC 7727 GiP 23 39 53.870 -12 17 34.84   11   10.55   ~ 159 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-12:25:41

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