2017A&A...598L...9M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:57:17

2017A&A...598L...9M - Astronomy and Astrophysics, volume 598, L9-9 (2017/2-1)

The power of teaming up HST and Gaia: the first proper motion measurement of the distant cluster NGC 2419.

MASSARI D., POSTI L., HELMI A., FIORENTINO G. and TOLSTOY E.

Abstract (from CDS):

Aims. We present the first measurement of the proper motion and orbit of the very distant and intriguing globular cluster NCG 2419.
Methods. We have combined data from HST and Gaia DR1 to derive the relative proper motions of stars in the direction of the cluster. To tie these to an absolute reference frame, we have used a background galaxy located in the field.
Results. We find the absolute proper motion of NGC 2419 to be (µαcos(δ), µδ)=(-0.17±0.26, -0.49±0.17)mas/yr. We have integrated the orbit of the cluster in a Galactic potential and found it to oscillate between ∼53kpc and ∼98kpc on an almost polar orbit. This, and the fact that it shares the same sense of rotation around the Milky Way, make it very likely that NGC 2419 is a former cluster of the Sagittarius dwarf spheroidal galaxy.

Abstract Copyright: © ESO, 2017

Journal keyword(s): globular clusters: individual: NGC 2419 - astrometry - proper motions

Simbad objects: 3

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Number of rows : 3

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     ~ 815 0
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
3 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2

    Equat.    Gal    SGal    Ecl

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2020.07.03-21:57:17

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