2017MNRAS.468...97L

Query : 2017MNRAS.468...97L

2017MNRAS.468...97L - Mon. Not. R. Astron. Soc., 468, 97-108 (2017/June-2)

The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates.

LUQUE E., PIERES A., SANTIAGO B., YANNY B., VIVAS A.K., QUEIROZ A., DRLICA-WAGNER A., MORGANSON E., BALBINOT E., MARSHALL J.L., LI T.S., FAUSTI NETO A., DA COSTA L.N., MAIA M.A.G., BECHTOL K., KIM A.G., BERNSTEIN G.M., DODELSON S., WHITEWAY L., DIEHL H.T., FINLEY D.A., ABBOTT T., ABDALLA F.B., ALLAM S., ANNIS J., BENOIT-LEVY A., BERTIN E., BROOKS D., BURKE D.L., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DESAI S., DOEL P., EVRARD A.E., FLAUGHER B., FOSALBA P., GERDES D.W., GOLDSTEIN D.A., GRUEN D., GRUENDL R.A., GUTIERREZ G., JAMES D.J., KUEHN K., KUROPATKIN N., LAHAV O., MARTINI P., MIQUEL R., NORD B., OGANDO R., PLAZAS A.A., ROMER A.K., SANCHEZ E., SCARPINE V., SCHUBNELL M., SEVILLA-NOARBE I., SMITH R.C., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., THOMAS D. and WALKER A.R.

Abstract (from CDS):

We report the discovery of two new candidate stellar systems in the constellation of Cetus using the data from the first two years of the Dark Energy Survey (DES). The objects, DES J0111-1341 and DES J0225+0304, are located at a heliocentric distance of ∼25 kpc and appear to have old and metal-poor populations. Their distances to the Sagittarius orbital plane, ∼1.73 kpc (DES J0111-1341) and ∼0.50 kpc (DES J0225+0304), indicate that they are possibly associated with the Sagittarius dwarf stream. The half-light radius (rh ≃ 4.55 pc) and luminosity (MV ≃ +0.3) of DES J0111-1341 are consistent with it being an ultrafaint stellar cluster, while the half-light radius (rh ≃ 18.55 pc) and luminosity (MV ≃ -1.1) of DES J0225+0304 place it in an ambiguous region of size-luminosity space between stellar clusters and dwarf galaxies. Determinations of the characteristic parameters of the Sagittarius stream, metallicity spread (-2.18 <= [Fe/H] <= -0.95) and distance gradient (23 kpc <= D☉ <= 29 kpc), within the DES footprint in the Southern hemisphere, using the same DES data, also indicate a possible association between these systems. If these objects are confirmed through spectroscopic follow-up to be gravitationally bound systems and to share a Galactic trajectory with the Sagittarius stream, DES J0111-1341 and DES J0225+0304 would be the first ultrafaint stellar systems associated with the Sagittarius stream. Furthermore, DES J0225+0304 would also be the first confirmed case of an ultrafaint satellite of a satellite.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: general - galaxies: dwarf - galaxies: dwarf

Nomenclature: [LPS2017] DES JHHMM+DDMM N=2.

Simbad objects: 35

goto Full paper

goto View the references in ADS

Number of rows : 35
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 NGC 55 rG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 828 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 480 2
4 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
5 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1614 2
6 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
7 [LPS2017] DES J0111-1341 Cl* 01 11 10.30 -13 41 05.4           ~ 6 0
8 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
9 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 177 0
10 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
11 [LPS2017] DES J0225+0304 G? 02 25 42.40 +03 04 10.1           ~ 23 0
12 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
13 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
14 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
15 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
16 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
17 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
18 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
19 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
20 Cl Berkeley 29 OpC 06 53 03.6 +16 55 24   14.3       ~ 187 0
21 Koposov 2 GlC 07 58 17.00 +26 15 19.4           ~ 85 1
22 Koposov 1 GlC 11 59 18.40 +12 15 35.8           ~ 81 0
23 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
24 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 333 0
25 NAME Munoz 1 Cl* 15 01 48.02 +66 58 07.3           ~ 29 0
26 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
27 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
28 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
29 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 460 0
30 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 384 0
31 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 357 0
32 Cl Pal 12 GlC 21 46 38.84 -21 15 09.4     11.89     ~ 548 0
33 NAME Kim 1 Cl* 22 11 41.30 +07 01 31.8           ~ 31 0
34 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
35 NAME Tuc V G 23 37.4 -63 16           ~ 84 0

To bookmark this query, right click on this link: simbad:objects in 2017MNRAS.468...97L and select 'bookmark this link' or equivalent in the popup menu