2019MNRAS.488..253S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.25CEST09:50:37

2019MNRAS.488..253S - Mon. Not. R. Astron. Soc., 488, 253-258 (2019/September-1)

The retrograde orbit of the globular cluster FSR1758 revealed with Gaia DR2.

SIMPSON J.D.

Abstract (from CDS):

We report the first radial velocity measurements of the recently identified globular cluster FSR1758. From the two member stars with radial velocities from the Gaia Radial Velocity Spectrograph reported in Gaia DR2, we find FSR1758 has a radial velocity of 227 ± 1 \textrmkm \textrms–1. We also find potential extra-tidal star lost from the cluster in the surrounding 1 deg. Combined with Gaia proper motions and photometric distance estimates, this shows that FSR1758 is on a relatively retrograde, radial orbit with a pericentre of 3.8–0.9+0.9 kpc, an apocentre of 16–5+8 kpc, and eccentricity of 0.62–0.04+0.05. Although it is currently at a Galactocentric distance of 3.8–0.9+0.9 kpc - at the edge of the bulge - it is an intruder from the halo. We investigate whether a reported 'halo' of stars around FSR1758 is related to the cluster, and find that most of these stars are likely foreground dwarf stars. We conclude that FSR1758 is not a dwarf galaxy, but rather a globular cluster.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): globular clusters: individual: FSR1758

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 818 0
2 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 730 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3020 0
4 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 312 0
5 TYC 7887-1019-1 * 17 27 32.0128998044 -40 28 46.148636449   12.74 11.56     ~ 1 0
6 IRAS 17242-4019 * 17 27 41.9057244248 -40 21 42.244074525   11.50 9.62     ~ 1 0
7 Gaia DR2 5960228611762486016 * 17 28 36.2941927233 -39 40 40.233702447           ~ 1 0
8 Gaia DR2 5960133370929943296 * 17 30 13.3195779431 -40 21 23.700588751           ~ 1 0
9 Gaia DR2 5961768374719872768 * 17 30 53.8655231472 -39 04 41.489855792           ~ 1 0
10 [KPS2012] MWSC 2617 GlC 17 31 12.0 -39 48 30           ~ 22 0
11 Gaia DR2 5961664784449145344 * 17 31 21.1386177057 -39 45 57.175139795           ~ 2 0
12 Gaia DR2 5961661825166384256 * 17 31 25.2575807731 -39 47 06.413545786           ~ 2 0
13 Gaia DR2 5959364812304283136 * 17 33 10.7222054064 -40 36 07.802838358           ~ 1 0
14 NAME cl Djorgovski 1 GlC 17 47 28.30 -33 03 56.0           ~ 57 0
15 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 698 1
16 ESO 521-16 GlC 18 02 57.40 -26 04 00.0           ~ 73 0
17 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1223 0
18 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 908 0
19 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 904 1
20 NAME Galactic Bulge reg ~ ~           ~ 3433 0

    Equat.    Gal    SGal    Ecl

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2020.09.25-09:50:37

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