A dwarf irregular galaxy at the edge of the local group: Stellar populations and distance of IC 5152

Albert A. Zijlstra, Dante Minniti

Resultado de la investigación: Article

17 Citas (Scopus)

Resumen

We have obtained V-and I-band photometry for about 700 stars in the field of the dwarf irregular galaxy IC 5152, previously considered a possible member of the Local Group. Deep VI color-magnitude diagrams are presented of the main body of this galaxy and of a nearby field. We infer a distance by comparison with the VI color-magnitude diagrams of similar galaxies and with theoretical isochrones. The distance modulus to IC 5152 is found to be m - M0 = 26.15 + 0.2, adopting E(V - I) = 0. This distance of D = 1.7 Mpc implies that IC 5152 is not a certain member of the Local Group. We also construct a deep optical luminosity function. By comparison with theoretical isochrones, we find a metallicity Z ≈ 0.002, which is lower than previous estimates. Using this metallicity and distance, IC 5152 now fits the metallicity-luminosity relation for dwarf galaxies. The youngest stars in the field studied have an age of ∼ 107 Gyr, and there is a substantial population of stars with log t > 7.8-8 yr. The central region of IC 5152 is an active site of star formation, as found by comparing our optical photometry with Hubble Space Telescope ultraviolet images. Several candidate globular clusters are found, as well as a candidate for a potential nucleus.

Idioma originalEnglish
Páginas (desde-hasta)1743-1757
Número de páginas15
PublicaciónAstronomical Journal
Volumen117
N.º4
EstadoPublished - abr 1999

Huella dactilar

irregular galaxies
dwarf galaxies
diagram
metallicity
color-magnitude diagram
stars
photometry
luminosity
galaxies
globular clusters
Hubble Space Telescope
star formation
nuclei
comparison
estimates
young

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

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title = "A dwarf irregular galaxy at the edge of the local group: Stellar populations and distance of IC 5152",
abstract = "We have obtained V-and I-band photometry for about 700 stars in the field of the dwarf irregular galaxy IC 5152, previously considered a possible member of the Local Group. Deep VI color-magnitude diagrams are presented of the main body of this galaxy and of a nearby field. We infer a distance by comparison with the VI color-magnitude diagrams of similar galaxies and with theoretical isochrones. The distance modulus to IC 5152 is found to be m - M0 = 26.15 + 0.2, adopting E(V - I) = 0. This distance of D = 1.7 Mpc implies that IC 5152 is not a certain member of the Local Group. We also construct a deep optical luminosity function. By comparison with theoretical isochrones, we find a metallicity Z ≈ 0.002, which is lower than previous estimates. Using this metallicity and distance, IC 5152 now fits the metallicity-luminosity relation for dwarf galaxies. The youngest stars in the field studied have an age of ∼ 107 Gyr, and there is a substantial population of stars with log t > 7.8-8 yr. The central region of IC 5152 is an active site of star formation, as found by comparing our optical photometry with Hubble Space Telescope ultraviolet images. Several candidate globular clusters are found, as well as a candidate for a potential nucleus.",
keywords = "Galaxies: individual (IC 5152, IRAS 21594-51, ESO 237-27), Galaxies: irregular, Galaxies: stellar content, Galaxy: formation, Local group",
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A dwarf irregular galaxy at the edge of the local group : Stellar populations and distance of IC 5152. / Zijlstra, Albert A.; Minniti, Dante.

En: Astronomical Journal, Vol. 117, N.º 4, 04.1999, p. 1743-1757.

Resultado de la investigación: Article

TY - JOUR

T1 - A dwarf irregular galaxy at the edge of the local group

T2 - Stellar populations and distance of IC 5152

AU - Zijlstra, Albert A.

AU - Minniti, Dante

PY - 1999/4

Y1 - 1999/4

N2 - We have obtained V-and I-band photometry for about 700 stars in the field of the dwarf irregular galaxy IC 5152, previously considered a possible member of the Local Group. Deep VI color-magnitude diagrams are presented of the main body of this galaxy and of a nearby field. We infer a distance by comparison with the VI color-magnitude diagrams of similar galaxies and with theoretical isochrones. The distance modulus to IC 5152 is found to be m - M0 = 26.15 + 0.2, adopting E(V - I) = 0. This distance of D = 1.7 Mpc implies that IC 5152 is not a certain member of the Local Group. We also construct a deep optical luminosity function. By comparison with theoretical isochrones, we find a metallicity Z ≈ 0.002, which is lower than previous estimates. Using this metallicity and distance, IC 5152 now fits the metallicity-luminosity relation for dwarf galaxies. The youngest stars in the field studied have an age of ∼ 107 Gyr, and there is a substantial population of stars with log t > 7.8-8 yr. The central region of IC 5152 is an active site of star formation, as found by comparing our optical photometry with Hubble Space Telescope ultraviolet images. Several candidate globular clusters are found, as well as a candidate for a potential nucleus.

AB - We have obtained V-and I-band photometry for about 700 stars in the field of the dwarf irregular galaxy IC 5152, previously considered a possible member of the Local Group. Deep VI color-magnitude diagrams are presented of the main body of this galaxy and of a nearby field. We infer a distance by comparison with the VI color-magnitude diagrams of similar galaxies and with theoretical isochrones. The distance modulus to IC 5152 is found to be m - M0 = 26.15 + 0.2, adopting E(V - I) = 0. This distance of D = 1.7 Mpc implies that IC 5152 is not a certain member of the Local Group. We also construct a deep optical luminosity function. By comparison with theoretical isochrones, we find a metallicity Z ≈ 0.002, which is lower than previous estimates. Using this metallicity and distance, IC 5152 now fits the metallicity-luminosity relation for dwarf galaxies. The youngest stars in the field studied have an age of ∼ 107 Gyr, and there is a substantial population of stars with log t > 7.8-8 yr. The central region of IC 5152 is an active site of star formation, as found by comparing our optical photometry with Hubble Space Telescope ultraviolet images. Several candidate globular clusters are found, as well as a candidate for a potential nucleus.

KW - Galaxies: individual (IC 5152, IRAS 21594-51, ESO 237-27)

KW - Galaxies: irregular

KW - Galaxies: stellar content

KW - Galaxy: formation

KW - Local group

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