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Title:
Tidal Streams in the Galactic Halo: Evidence for the Sagittarius Northern Stream or Traces of a New Nearby Dwarf Galaxy
Authors:
Martínez-Delgado, David; Aparicio, Antonio; Gómez-Flechoso, M. Ángeles; Carrera, Ricardo
Affiliation:
AA(Instituto de Astrofísica de Canarias, E38205 La Laguna, Tenerife, Canary Islands, Spain), AB(Instituto de Astrofísica de Canarias, E38205 La Laguna, Tenerife, Canary Islands, Spain; and Departamento de Astrofísica, Universidad de La Laguna, E38200 La Laguna, Tenerife, Canary Islands, Spain), AC(Geneva Observatory, Chemin des Maillettes 51, CH-1290 Sauverny, Switzerland), AD(Instituto de Astrofísica de Canarias, E38205 La Laguna, Tenerife, Canary Islands, Spain)
Publication:
The Astrophysical Journal, Volume 549, Issue 2, pp. L199-L202. (ApJ Homepage)
Publication Date:
03/2001
Origin:
UCP
ApJ Keywords:
Galaxy: Evolution, Galaxy: Formation, Galaxy: Halo, Galaxies: Individual: Name: Sagittarius, Galaxy: Structure
DOI:
10.1086/319167
Bibliographic Code:
2001ApJ...549L.199M

Abstract

Standard cosmology predicts that dwarfs were the first galaxies to be formed in the universe and that many of them merge afterward to form bigger galaxies such as the Milky Way. This process would have left behind traces such as tidal debris or star streams in the outer halo. We report here the detection of a very low density stellar system at 50+/-10 kpc from the Galactic center that could be related to the merger process. It could form part of the Sagittarius northern stream or, alternatively, could be the trace of a hitherto unknown dwarf galaxy. The dwarf galaxy in Sagittarius, the closest satellite of the Milky Way, is currently being tidally disrupted and is a ``living'' test for galaxy formation theories. The system found here is 60° away from the center of the Sagittarius galaxy. If it is really associated with this galaxy, it would confirm predictions of dynamical interaction models indicating that tidal debris from Sagittarius could extend along a stream completely enveloping the Milky Way in a polar orbit.
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