2019ApJ...875...77P


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST16:14:34

2019ApJ...875...77P - Astrophys. J., 875, 77-77 (2019/April-2)

Proper motions of Milky Way ultra-faint satellites With Gaia DR2 X DES DR1.

PACE A.B. and LI T.S.

Abstract (from CDS):

We present a new, probabilistic method for determining the systemic proper motions of Milky Way (MW) ultra-faint satellites in the Dark Energy Survey (DES). We utilize the superb photometry from the first public data release (DR1) of the DES to select candidate members and cross-match them with the proper motions from the Gaia DR2. We model the candidate members with a mixture model (satellite and MW) in spatial and proper motion space. This method does not require prior knowledge of satellite membership and can successfully determine the tangential motion of 13 DES satellites. With our method, we present measurements of the following satellites: Columba I, Eridanus III, Grus II, Phoenix II, Pictor I, Reticulum III, and Tucana IV. This is the first systemic proper motion measurement for several of these satellites, and the majority lack extensive spectroscopic follow-up studies. We compare these to the predictions of Large Magellanic Cloud satellites and the vast polar structure. With the high-precision DES photometry, we conclude that most of the newly identified member stars are very metal-poor ([Fe/H] <= -2), similar to other ultra-faint dwarf galaxies, while Reticulum III is likely more metal-rich. We also find potential members in the following satellites that might indicate their overall proper motion: Cetus II, Kim 2, and Horologium II. However, due to the small number of members in each satellite, spectroscopic follow-up observations are necessary to determine the systemic proper motion in these satellites.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: kinematics and dynamics - Local Group - proper motions - stars: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/ApJ/875/77): table1.dat table4.dat>

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

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 - 2021
#notes
1 NAME Tuc IV G 00 02.9 -60 51           ~ 43 0
2 DES J0034-4902 GlC 00 33 59.60 -49 02 19.8           ~ 12 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9797 1
4 NAME Cetus II G 01 17.9 -17 25           ~ 27 0
5 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 200 0
6 NAME Sgr Stream St* 02 22 +00.0           ~ 697 0
7 NAME Eri III G 02 22 45.480 -52 17 04.92           ~ 47 0
8 DES J0225+0304 G? 02 25 42.40 +03 04 10.1           ~ 12 0
9 NAME Hor I G 02 55 31.7 -54 07 08           ~ 94 0
10 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 37 0
11 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 208 0
12 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 110 0
13 NAME Reticulum III G 03 45.4 -60 27           ~ 33 0
14 NAME Pic I G 04 43 47.4 -50 16 59           ~ 39 0
15 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15361 1
16 NAME Col I G 05 31.4 -28 02           ~ 29 0
17 NAME Leo Cluster ClG 11 30.0 +15 00           ~ 49 0
18 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 66 1
19 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1943 0
20 NAME Ind II G 20 38.9 -46 10           ~ 20 0
21 NAME Indus I Cl* 21 08 49.970 -51 09 48.60           ~ 43 0
22 NAME Gru II G 22 04.1 -46 26           ~ 41 0
23 NAME Pegasus III G 22 24 22.6 +05 25 12           ~ 36 0
24 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 90 0
25 NAME Grus I G 22 56 42.4 -50 09 48           ~ 60 0
26 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 221 0
27 NAME Tucana III Stream St* 23 35 -59.7           ~ 9 0
28 NAME Tuc V G 23 37.4 -63 16           ~ 37 0
29 NAME Phe II G 23 39 59.4 -54 24 22           ~ 49 0
30 NAME Tuc III G 23 56.6 -59 36           ~ 108 0
31 NAME Local Group GrG ~ ~           ~ 7266 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-16:14:34

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