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Titolo:
Tidal streams in the galactic halo: Evidence for the Sagittarius northern stream or traces of a new nearby dwarf galaxy
Autore:
Martinez-Delgado, D; Aparicio, A; Gomez-Flechoso, MA; Carrera, R;
Indirizzi:
Inst Astrofis Canarias, E-38205 Tenerife, Canary Islands, Spain Inst Astrofis Canarias Tenerife Canary Islands Spain E-38205 lands, Spain Univ La Laguna, Dept Astrofis, E-38200 La Laguna, Tenerife, Spain Univ La Laguna La Laguna Tenerife Spain E-38200 a Laguna, Tenerife, Spain Observ Geneva, CH-1290 Sauverny, Switzerland Observ Geneva Sauverny Switzerland CH-1290 CH-1290 Sauverny, Switzerland
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 2, volume: 549, anno: 2001,
parte:, 2
pagine: L199 - L202
SICI:
0004-637X(20010310)549:2<L199:TSITGH>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SURVEY COMMISSIONING DATA; AGE-METALLICITY RELATION; SPHEROIDAL GALAXY; MILKY-WAY; STARS; PHOTOMETRY; HISTORY;
Keywords:
galaxy : evolution; galaxy : formation; galaxy : halo; galaxies : individual (Sagittarius); galaxy : structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Martinez-Delgado, D Inst Astrofis Canarias, E-38205 Tenerife, Canary Islands, Spain Inst Astrofis Canarias Tenerife Canary Islands Spain E-38205
Citazione:
D. Martinez-Delgado et al., "Tidal streams in the galactic halo: Evidence for the Sagittarius northern stream or traces of a new nearby dwarf galaxy", ASTROPHYS J, 549(2), 2001, pp. L199-L202

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 ofa hitherto unknown dwarf galaxy. The dwarf galaxy in Sagittarius, the closest satellite of the Milky Way, is currently being tidally disrupted and isa "living" test for galaxy formation theories. The system found here is 60degrees 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 12:05:15