2017MNRAS.467..573C

Query : 2017MNRAS.467..573C

2017MNRAS.467..573C - Mon. Not. R. Astron. Soc., 467, 573-585 (2017/May-1)

Dynamical evidence for a strong tidal interaction between the Milky Way and its satellite, Leo V.

COLLINS M.L.M., TOLLERUD E.J., SAND D.J., BONACA A., WILLMAN B. and STRADER J.

Abstract (from CDS):

We present a chemodynamical analysis of the Leo V dwarf galaxy, based on the Keck II DEIMOS spectra of eight member stars. We find a systemic velocity for the system of <vr>=_170.9^+ 2.1^–1.9  km s–1 and barely resolve a velocity dispersion for the system, with σvr = 2.3+3.2–1.6  km s–1, consistent with previous studies of Leo V. The poorly resolved dispersion means we are unable to adequately constrain the dark-matter content of Leo V. We find an average metallicity for the dwarf of [Fe/H] =-2.48 ± 0.21 and measure a significant spread in the iron abundance of its member stars, with -3.1 <= [Fe/H] <=-1.9 dex, which clearly identifies Leo V as a dwarf galaxy that has been able to self-enrich its stellar population through extended star formation. Owing to the tentative photometric evidence for the tidal substructure around Leo V, we also investigate whether there is any evidence for tidal stripping or shocking of the system within its dynamics. We measure a significant velocity gradient across the system, of d/v dχ= -4.1+2.8–2.6  km s–1 arcmin–1 (or d/v dχ= -71.9+50.8–45.6  km s–1 kpc–1), which points almost directly towards the Galactic Centre. We argue that Leo V is likely a dwarf on the brink of dissolution, having just barely survived a past encounter with the centre of the Milky Way.

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

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: individual - galaxies: kinematics and dynamics - Local Group - Local Group

Nomenclature: Table 1: [CTS2017] NN N=28 among (Nos 10-62).

Simbad objects: 42

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Number of rows : 42
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 Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
2 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
3 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
4 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
5 [CTS2017] 10 * 11 30 44.8930169496 +02 10 16.914767916           ~ 1 0
6 [CTS2017] 11 * 11 30 49.0421447400 +02 11 28.468152708           ~ 1 0
7 [CTS2017] 13 * 11 30 49.9830552456 +02 10 09.203384784           ~ 1 0
8 [CTS2017] 17 RG* 11 30 57.3 +02 09 45           ~ 2 0
9 [CTS2017] 18 * 11 30 58.6 +02 12 27           ~ 1 0
10 [CTS2017] 19 * 11 30 59.0559242136 +02 08 48.334495200           ~ 1 0
11 [CTS2017] 20 * 11 30 59.2263771240 +02 09 31.566402828           ~ 1 0
12 [CTS2017] 23 * 11 31 00.9391942560 +02 10 34.117147884           ~ 1 0
13 [CTS2017] 24 * 11 31 02.3 +02 11 11           ~ 1 0
14 [WBE2009] L5-004 RG* 11 31 02.8790855928 +02 13 14.678080968           ~ 3 0
15 [CTS2017] 26 * 11 31 03.2129286888 +02 12 08.263013652           ~ 1 0
16 [CTS2017] 27 * 11 31 06.3 +02 13 00           ~ 2 0
17 HiTS J113107+021302 * 11 31 06.6 +02 13 02           ~ 4 0
18 [WBE2009] L5-003 * 11 31 07.1646892296 +02 12 18.071895888           ~ 2 0
19 [CTS2017] 32 RG* 11 31 08.5590408768 +02 13 09.774945336           ~ 2 0
20 [CTS2017] 34 * 11 31 09.4 +02 16 53           ~ 1 0
21 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
22 [CTS2017] 35 * 11 31 10.4387036040 +02 15 52.876145412           ~ 1 0
23 [WBE2009] L5-002 RG* 11 31 10.5934996392 +02 14 09.526166520           ~ 3 0
24 [CTS2017] 38 * 11 31 10.6233462768 +02 16 50.278689228           ~ 1 0
25 [CTS2017] 41 RG* 11 31 12.0639699528 +02 12 59.639176188           ~ 2 0
26 [WBE2009] L5-001 RG* 11 31 13.2111933744 +02 12 51.607116144           ~ 3 0
27 [CTS2017] 45 * 11 31 13.8 +02 14 37           ~ 1 0
28 [WBE2009] L5-005 * 11 31 15.0106721760 +02 14 55.835355912           ~ 3 0
29 [CTS2017] 48 * 11 31 20.2 +02 18 18           ~ 1 0
30 [CTS2017] 54 * 11 31 23.7468163824 +02 15 03.031779384           ~ 1 0
31 [CTS2017] 56 * 11 31 24.1 +02 17 46           ~ 1 0
32 [CTS2017] 57 * 11 31 25.1 +02 16 40           ~ 1 0
33 [CTS2017] 62 * 11 31 32.1 +02 18 07           ~ 1 0
34 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
35 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
36 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
37 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
38 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
39 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
40 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
42 NAME Local Group GrG ~ ~           ~ 9325 0

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