2018ApJ...852...68C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET15:21:08

2018ApJ...852...68C - Astrophys. J., 852, 68-68 (2018/January-2)

On the nature of ultra-faint dwarf galaxy candidates. I. DES1, Eridanus III, and Tucana V.

CONN B.C., JERJEN H., KIM D. and SCHIRMER M.

Abstract (from CDS):

We use deep Gemini/GMOS-S g, r photometry to study the three ultra-faint dwarf galaxy candidates DES1, Eridanus III (Eri III), and Tucana V (Tuc V). Their total luminosities, MV(DES1) = -1.42 ± 0.50 and MV(Eri III) = -2.07 ± 0.50, and mean metallicities, [Fe/H]=-2.38–0.19+0.21 and [Fe/H]=-2.40–0.12+0.19, are consistent with them being ultra-faint dwarf galaxies, as they fall just outside the 1σ confidence band of the luminosity-metallicity relation for Milky Way satellite galaxies. However, their positions in the size-luminosity relation suggest that they are star clusters. Interestingly, DES1 and Eri III are at relatively large Galactocentric distances, with DES1 located at DGC=74±4 kpc and Eri III at DGC=91±4 kpc. In projection, both objects are in the tail of gaseous filaments trailing the Magellanic Clouds and have similar 3D separations from the Small Magellanic Cloud (SMC): ΔDSMC,DES1=31.7 kpc and ΔDSMC,EriIII=41.0 kpc, respectively. It is plausible that these stellar systems are metal-poor SMC satellites. Tuc V represents an interesting phenomenon in its own right. Our deep photometry at the nominal position of Tuc V reveals a low-level excess of stars at various locations across the GMOS field without a well-defined center. An SMC Northern Overdensity-like isochrone would be an adequate match to the Tuc V color-magnitude diagram, and the proximity to the SMC (12.°1; ΔDSMC,TucV=13 kpc) suggests that Tuc V is either a chance grouping of stars related to the SMC halo or a star cluster in an advanced stage of dissolution.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - Galaxy: halo - globular clusters: general - Hertzsprung-Russell and C-M diagrams - Local Group - Local Group

Simbad objects: 41

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Number of rows : 41

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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 790 1
2 DES J0034-4902 GlC 00 33 59.60 -49 02 19.8           ~ 9 1
3 NAME SMC Northern Overdensity St* 00 48 00 -64 48.0           ~ 4 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9195 1
5 NAME Cetus II G 01 17.9 -17 25           ~ 18 0
6 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 53 0
7 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 174 0
8 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 34 0
9 NAME Hor I G 02 55 31.7 -54 07 08           ~ 66 0
10 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5462 1
11 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 157 0
12 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 80 0
13 NAME E 1 GlC 03 55 02.5 -49 36 52           ~ 173 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14492 1
15 NAME SMASH 1 GlC 06 20 59.90 -80 23 44.7           ~ 5 0
16 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 793 0
17 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 56 1
18 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 281 1
19 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 338 1
20 GCl 17 GlC 11 29 16.80 +28 58 25.0   14.4       ~ 307 1
21 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 51 1
22 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 55 0
23 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 44 0
24 NAME Kim 3 Cl* 13 22 45.20 -30 36 03.6           ~ 9 0
25 C 1353-269 GlC 13 56 21.1 -27 10 03           ~ 100 0
26 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 181 0
27 NAME Munoz 1 Cl* 15 01 48.02 +66 58 07.3           ~ 13 0
28 NAME Laevens 4 Gl? 15 52 47.6 +64 33 55           ~ 42 0
29 GCl 38 GlC 16 10 59.00 +14 57 42.0           ~ 314 0
30 NGC 6144 GlC 16 27 13.86 -26 01 24.6   10.55 9.63     ~ 191 0
31 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 293 1
32 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1673 2
33 NAME Laevens 5 Gl? 19 52 40.5 -22 04 05           ~ 25 0
34 NAME Indus I Cl* 21 08 49.970 -51 09 48.60           ~ 33 0
35 NAME Balbinot 1 Cl* 22 10 42.819 +14 56 49.03           ~ 20 0
36 NAME Kim 1 Cl* 22 11 41.30 +07 01 31.8           ~ 21 0
37 NAME Pegasus III G 22 24 22.6 +05 25 12           ~ 26 0
38 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 204 0
39 NAME Tuc V G 23 37.4 -63 16           ~ 25 0
40 NAME Tuc III G 23 56.6 -59 36           ~ 65 0
41 NAME Local Group GrG ~ ~           ~ 6773 0

    Equat.    Gal    SGal    Ecl

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2020.01.28-15:21:08

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