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Titolo:
A tidal extension in the Ursa Minor dwarf spheroidal galaxy
Autore:
Martinez-Delgado, D; Alonso-Garcia, J; Aparicio, A; Gomez-Flechoso, MA;
Indirizzi:
Inst Astrofis Canarias, E-38200 Tenerife, Canary Isl, Spain Inst Astrofis Canarias Tenerife Canary Isl Spain E-38200 anary Isl, Spain Observ Geneva, CH-1290 Sauverny, Switzerland Observ Geneva Sauverny Switzerland CH-1290 CH-1290 Sauverny, Switzerland Univ La Laguna, Dept Astrofis, E-38207 La Laguna, Spain Univ La Laguna LaLaguna Spain E-38207 strofis, E-38207 La Laguna, Spain
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 549, anno: 2001,
parte:, 2
pagine: L63 - L66
SICI:
0004-637X(20010301)549:1<L63:ATEITU>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLD DARK MATTER; TO-LIGHT RATIOS; GALACTIC HALO; MILKY-WAY; SATELLITE GALAXIES; STELLAR POPULATION; RADIAL-VELOCITIES; STARS; SAGITTARIUS; DRACO;
Keywords:
galaxies : evolution; galaxies : formation; galaxies : halos; galaxies : individual (Ursa Minor); galaxies : structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Martinez-Delgado, D Inst Astrofis Canarias, E-38200 Tenerife, Canary Isl, Spain Inst Astrofis Canarias Tenerife Canary Isl Spain E-38200
Citazione:
D. Martinez-Delgado et al., "A tidal extension in the Ursa Minor dwarf spheroidal galaxy", ASTROPHYS J, 549(1), 2001, pp. L63-L66

Abstract

We report the detection of main-sequence and blue horizontal-branch stars of the Ursa Minor dwarf spheroidal galaxy beyond its tidal radius, indicating the existence of a possible tidal extension in this satellite of the Milky Way. This tidal extension could spread out well beyond the area covered in our survey (R > 80'), as suggested by the presence of a "break" to a shallower slope observed in its density profile. The V-band surface brightnessfor this possible tidal extension ranges from 29.8 to 31.5 mag arcsec(-2). The area covered in our survey (similar to1.65 deg(2)) is not enough to discriminate if this extratidal population is part of a tidal tail or an extended halo around the galaxy. The existence of this tidal extension in Ursa Minor indicates that this satellite is currently undergoing a tidal disruption process by the Milky Way. We discuss the possibility of a tidal origin for the high mass-to-light ratio observed in this galaxy on the basis of our result and recent theoretical simulations of the tidal disruption of dwarf satellites in the Galactic halo.

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Documento generato il 24/01/20 alle ore 12:16:07