Dwarf galaxies also have stellar halos

Dante Minniti, Albert A. Zijlstra

Resultado de la investigación: Article

56 Citas (Scopus)

Resumen

We present evidence for the existence of an old stellar halo in the dwarf irregular galaxy WLM, an isolated member of the Local Group. The halo consists of Population II stars, with low metallicities and age ≥1010 yr. The finding of a halo in a dwarf irregular galaxy argues for a generic mode of galaxy formation that requires a halo in the presence of a disk, regardless of galaxy size. This implies that formation mechanisms are similar along the spiral Hubble sequence, and favors the scenarios where the formation takes place during the original collapse and accretion of the protogalactic gas clouds. Halo formation also appears not necessarily to be related to the presence of a bulge, or a nucleus, since WLM lacks both of these components.

Idioma originalEnglish
PublicaciónAstrophysical Journal
Volumen467
N.º1 PART II
EstadoPublished - 1 ene 1996

Huella dactilar

formation mechanism
dwarf galaxies
halos
accretion
irregular galaxies
gas
Population II stars
galactic evolution
metallicity
galaxies
nuclei
gases

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Minniti, D., & Zijlstra, A. A. (1996). Dwarf galaxies also have stellar halos. Astrophysical Journal, 467(1 PART II).
Minniti, Dante ; Zijlstra, Albert A. / Dwarf galaxies also have stellar halos. En: Astrophysical Journal. 1996 ; Vol. 467, N.º 1 PART II.
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Minniti, D & Zijlstra, AA 1996, 'Dwarf galaxies also have stellar halos', Astrophysical Journal, vol. 467, n.º 1 PART II.

Dwarf galaxies also have stellar halos. / Minniti, Dante; Zijlstra, Albert A.

En: Astrophysical Journal, Vol. 467, N.º 1 PART II, 01.01.1996.

Resultado de la investigación: Article

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AU - Zijlstra, Albert A.

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AB - We present evidence for the existence of an old stellar halo in the dwarf irregular galaxy WLM, an isolated member of the Local Group. The halo consists of Population II stars, with low metallicities and age ≥1010 yr. The finding of a halo in a dwarf irregular galaxy argues for a generic mode of galaxy formation that requires a halo in the presence of a disk, regardless of galaxy size. This implies that formation mechanisms are similar along the spiral Hubble sequence, and favors the scenarios where the formation takes place during the original collapse and accretion of the protogalactic gas clouds. Halo formation also appears not necessarily to be related to the presence of a bulge, or a nucleus, since WLM lacks both of these components.

KW - Galaxies: halos

KW - Galaxies: individual (WLM [DDO 221], A2359-1544, UGC A444)

KW - Galaxies: irregular

KW - Galaxies: stellar content

KW - Galaxy: formation

KW - Local Group

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