2022ApJ...940..136P

Query : 2022ApJ...940..136P

2022ApJ...940..136P - Astrophys. J., 940, 136 (2022/December-1)

Proper Motions, Orbits, and Tidal Influences of Milky Way Dwarf Spheroidal Galaxies.

PACE A.B., ERKAL D. and LI T.S.

Abstract (from CDS):

We combine Gaia early data release 3 astrometry with accurate photometry and utilize a probabilistic mixture model to measure the systemic proper motion of 52 dwarf spheroidal (dSph) satellite galaxies of the Milky Way (MW). For the 46 dSphs with literature line-of-sight velocities we compute orbits in both a MW and a combined MW + Large Magellanic Cloud (LMC) potential and identify Car II, Car III, Hor I, Hyi I, Phx II, and Ret II as likely LMC satellites. 40% of our dSph sample has a >25% change in pericenter and/or apocenter with the MW + LMC potential. For these orbits, we use a Monte Carlo sample for the observational uncertainties for each dSph and the uncertainties in the MW and LMC potentials. We predict that Ant II, Boo III, Cra II, Gru II, and Tuc III should be tidally disrupting by comparing each dSph's average density relative to the MW density at its pericenter. dSphs with large ellipticity (CVn I, Her, Tuc V, UMa I, UMa II, UMi, Wil 1) show a preference for their orbital direction to align with their major axis even for dSphs with large pericenters. We compare the dSph radial orbital phase to subhalos in MW-like N-body simulations and infer that there is not an excess of satellites near their pericenter. With projections of future Gaia data releases, we find that dSph's orbital precision will be limited by uncertainties in the distance and/or MW potential rather than in proper motion precision. Finally, we provide our membership catalogs to enable community follow-up.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dwarf spheroidal galaxies - Proper motions - Local Group

Simbad objects: 68

goto Full paper

goto View the references in ADS

Number of rows : 68
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 NAME Tuc IV G 00 02.9 -60 51           ~ 90 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
4 NAME Cetus II G 01 17.9 -17 25           ~ 56 0
5 NAME Whiting 1 GlC 02 02 56.8 -03 15 10           ~ 177 0
6 NAME Cetus III Dwarf Galaxy LSB 02 05 19.40 -04 16 12.0           ~ 32 0
7 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
8 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
9 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
10 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
11 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
12 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 579 0
13 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
14 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
15 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
16 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
17 NAME Pic I G 04 43 47.4 -50 16 59           ~ 58 0
18 NAME Eridanus IV G 05 05 45 -09 30.9     14.72     ~ 15 0
19 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
20 NAME Col I G 05 31.4 -28 02           ~ 60 0
21 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
22 NAME Pic II G 06 44 43 -59 53.8           ~ 33 0
23 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
24 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
25 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
26 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
27 NAME Sextans C GlC 10 05 30.96 +00 04 15.4   15.5 13.9     ~ 354 1
28 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
29 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
30 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
31 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
32 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
33 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
34 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
35 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
36 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
37 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
38 NAME Vir I Dwarf Galaxy LSB 12 00 09.6 -00 40 48           ~ 40 0
39 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
40 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
41 NAME Centaurus I G 12 38 20 -40 54.1     14.78     ~ 29 0
42 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
43 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
44 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
45 NAME Styx Stream St* 13 56 24.0 +26 48 00           ~ 30 0
46 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
47 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
48 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
49 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
50 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
51 NAME Bootes IV LSB 15 34 45 +43 43.6           ~ 24 0
52 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
53 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
54 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
55 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
56 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
57 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
58 NAME Sagittarius II Gl? 19 52 40.5 -22 04 05           ~ 97 0
59 NAME Gru II G 22 04.1 -46 26           ~ 110 0
60 NAME Pegasus III LSB 22 24 22.6 +05 25 12           ~ 69 0
61 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
62 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
63 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
64 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
65 NAME Tuc V G 23 37.4 -63 16           ~ 84 0
66 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
67 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
68 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2022ApJ...940..136P and select 'bookmark this link' or equivalent in the popup menu