2009MNRAS.398.1771N


Query : 2009MNRAS.398.1771N

2009MNRAS.398.1771N - Mon. Not. R. Astron. Soc., 398, 1771-1781 (2009/October-1)

The origin of Segue 1.

NIEDERSTE-OSTHOLT M., BELOKUROV V., EVANS N.W., GILMORE G., WYSE R.F.G. and NORRIS J.E.

Abstract (from CDS):

We apply the optimal filter technique to Sloan Digital Sky Survey photometry around Segue 1 and find that the outer parts of the cluster are distorted. There is strong evidence for ∼1° elongations of extra-tidal stars, extending both eastwards and southwestwards of the cluster. The extensions have similar differential Hess diagrams to Segue 1. A Kolmogorov-Smirnov test suggests a high probability that both come from the same parent distribution. The location of Segue 1 is close to crossings of the tidal wraps of the Sagittarius stream. By extracting blue horizontal branch stars from Sloan's spectral data base, two kinematic features are isolated and identified with different wraps of the Sagittarius stream. We show that Segue 1 is moving with a velocity that is close to one of the wraps. At this location, we estimate that there are enough Sagittarius stars, indistinguishable from Segue 1 stars, to inflate the velocity dispersion and hence the mass-to-light ratio. All the available evidence is consistent with the interpretation that Segue 1 is a star cluster, originally from the Sagittarius galaxy, and now dissolving in the Milky Way.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): globular clusters: individual: Segue 1 - galaxies: kinematics and dynamics

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Sagittarius Stream St* 02 22 +00.0           ~ 777 0
2 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 342 0
3 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 405 1
4 NAME Harrington-Wilson No1 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1136 1
5 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 287 0
6 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 215 0
7 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 691 1
8 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2006 0
9 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1987 2

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2022.09.27-03:35:05

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