2018MNRAS.478.2006L

Query : 2018MNRAS.478.2006L

2018MNRAS.478.2006L - Mon. Not. R. Astron. Soc., 478, 2006-2018 (2018/August-1)

Deep SOAR follow-up photometry of two Milky Way outer-halo companions discovered with Dark Energy Survey.

LUQUE E., SANTIAGO B., PIERES A., MARSHALL J.L., PACE A.B., KRON R., DRLICA-WAGNER A., QUEIROZ A., BALBINOT E., DAL PONTE M., FAUSTI NETO A., DA COSTA L.N., MAIA M.A.G., WALKER A.R., ABDALLA F.B., ALLAM S., ANNIS J., BECHTOL K., BENOIT-LEVY A., BERTIN E., BROOKS D., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CROCCE M., DAVIS C., DOEL P., EIFLER T.F., FLAUGHER B., GARCIA-BELLIDO J., GERDES D.W., GRUEN D., GRUENDL R.A., GUTIERREZ G., HONSCHEID K., JAMES D.J., KUEHN K., KUROPATKIN N., MIQUEL R., NICHOL R.C., PLAZAS A.A., SANCHEZ E., SCARPINE V., SCHINDLER R., SEVILLA-NOARBE I., SMITH M., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., TARLE G. and THOMAS D.

Abstract (from CDS):

We report the discovery of a new star cluster, DES 3, in the constellation of Indus, and deeper observations of the previously identified satellite DES J0222.7-5217 (Eridanus III). DES 3 was detected as a stellar overdensity in first-year Dark Energy Survey data, and confirmed with deeper photometry from the 4.1-m Southern Astrophysical Research (SOAR) telescope. The new system was detected with a relatively high significance and appears in the DES images as a compact concentration of faint blue point sources. We determine that DES 3 is located at a heliocentric distance of ≃76.2 kpc and it is dominated by an old (≃9.8 Gyr) and metal-poor ([Fe/H] ≃ -1.84) population. While the age and metallicity values of DES 3 are comparable to typical globular clusters (objects with a high stellar density, stellar mass of ∼105 M☉ and luminosity MV ∼ -7.3), its half-light radius (rh ∼ 6.87 pc) and luminosity (MV ∼ -1.7) are more indicative of faint star cluster. Based on the angular size, DES 3, with a value of rh ∼ 0′.31, is among the smallest faint star clusters known to date. Furthermore, using deeper imaging of DES J0222.7-5217 taken with the SOAR telescope, we update structural parameters and perform the first isochrone modelling. Our analysis yields the first age (≃12.6 Gyr) and metallicity ([Fe/H] ≃ -2.01) estimates for this object. The half-light radius (rh ≃ 11.24 pc) and luminosity (MV ≃ -2.4) of DES J0222.7-5217 suggest that it is likely a faint star cluster. The discovery of DES 3 indicates that the census of stellar systems in the Milky Way is still far from complete, and demonstrates the power of modern wide-field imaging surveys to improve our knowledge of the Galaxy's satellite population.

Abstract Copyright: © Crown copyright 2018.

Journal keyword(s): globular clusters: general - Galaxy: halo

Nomenclature: [LSP2018] DES N (No. 3) added.

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 - 2024 		#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 971 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12643 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11145 1
4 [KBT2017] Gaia 2 OpC 01 52 33 +53 03.5           ~ 17 0
5 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 149 0
6 NAME Sagittarius Stream St* 02 22 +00.0           ~ 874 0
7 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 63 0
8 NAME Hor I G 02 55 31.7 -54 07 08           ~ 141 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7062 0
10 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 309 0
11 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 174 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17428 0
13 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 69 1
14 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 69 0
15 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 425 0
16 NAME Kim 3 Cl* 13 22 45.20 -30 36 03.6           ~ 17 0
17 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 300 0
18 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 734 1
19 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1977 0
20 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1067 0
21 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2186 2
22 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 354 0
23 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 321 0
24 NAME Laevens 3 GlC 21 06 54.3 +14 58 48           ~ 26 0
25 NAME Indus I Cl* 21 08 49.970 -51 09 48.60           ~ 58 0
26 [LSP2018] DES 3 Cl* 21 40 13.200 -52 32 30.48           ~ 5 0
27 NAME Balbinot 1 Cl* 22 10 42.819 +14 56 49.03           ~ 27 0
28 NAME Kim 1 Cl* 22 11 41.30 +07 01 31.8           ~ 29 0
29 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 155 0
30 NAME Grus I G 22 56 42.4 -50 09 48           ~ 102 0
31 NAME Tuc III G 23 56.6 -59 36           ~ 189 0

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