Globular clusters in the inner regions of NGC 5128 (centaurus a)

Dante Minniti, M. Victoria Alonso, Paul Goudfroou, Pascale Jablonka, Georges Meylan

Resultado de la investigación: Article

26 Citas (Scopus)

Resumen

We have identified 26 new globular cluster candidates in the inner 3 kpc of NGC 5128 (Centaurus A), the nearest known large galaxy that is the probable product of a merger. The clusters are selected on the basis of their structural parameters (observed core diameters and duplicities), as measured from archival Wide Field Planetary Camera (WFPC) Hubble Space Telescope (HST) images. IR photometry obtained with IRAC2B at the ESO/MPI 2.2 m telescope is combined with the optical HST photometry. Most of these clusters have normal colors typical of old globular clusters like those found in the Milky Way and M31. We estimate their metal abundances based on the R-K° color, confirming the existence of a metallicity gradient in the inner regions of NGC 5128. The presence of metal-rich globular clusters suggests that one of the colliding galaxies was a bulge-dominated galaxy (E or early S). A few clusters have colors and magnitudes similar to intermediate-age clusters containing carbon stars in the Magellanic Clouds. If the intermediate-age clusters were formed during a merger, then this episode must have occurred a few gigayears ago. Alternatively, we are looking at the cluster members of one of the colliding galaxies, which would then have been a late-type disk galaxy.

Idioma originalEnglish
Páginas (desde-hasta)221-226
Número de páginas6
PublicaciónAstrophysical Journal
Volumen467
N.º1 PART I
EstadoPublished - 1996

Huella dactilar

globular clusters
merger
galaxies
metal
color
Hubble Space Telescope
photometry
carbon stars
disk galaxies
carbon
Magellanic clouds
European Southern Observatory
metals
metallicity
cameras
telescopes
gradients
estimates
products

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

Minniti, D., Victoria Alonso, M., Goudfroou, P., Jablonka, P., & Meylan, G. (1996). Globular clusters in the inner regions of NGC 5128 (centaurus a). Astrophysical Journal, 467(1 PART I), 221-226.
Minniti, Dante ; Victoria Alonso, M. ; Goudfroou, Paul ; Jablonka, Pascale ; Meylan, Georges. / Globular clusters in the inner regions of NGC 5128 (centaurus a). En: Astrophysical Journal. 1996 ; Vol. 467, N.º 1 PART I. pp. 221-226.
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abstract = "We have identified 26 new globular cluster candidates in the inner 3 kpc of NGC 5128 (Centaurus A), the nearest known large galaxy that is the probable product of a merger. The clusters are selected on the basis of their structural parameters (observed core diameters and duplicities), as measured from archival Wide Field Planetary Camera (WFPC) Hubble Space Telescope (HST) images. IR photometry obtained with IRAC2B at the ESO/MPI 2.2 m telescope is combined with the optical HST photometry. Most of these clusters have normal colors typical of old globular clusters like those found in the Milky Way and M31. We estimate their metal abundances based on the R-K° color, confirming the existence of a metallicity gradient in the inner regions of NGC 5128. The presence of metal-rich globular clusters suggests that one of the colliding galaxies was a bulge-dominated galaxy (E or early S). A few clusters have colors and magnitudes similar to intermediate-age clusters containing carbon stars in the Magellanic Clouds. If the intermediate-age clusters were formed during a merger, then this episode must have occurred a few gigayears ago. Alternatively, we are looking at the cluster members of one of the colliding galaxies, which would then have been a late-type disk galaxy.",
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Minniti, D, Victoria Alonso, M, Goudfroou, P, Jablonka, P & Meylan, G 1996, 'Globular clusters in the inner regions of NGC 5128 (centaurus a)', Astrophysical Journal, vol. 467, n.º 1 PART I, pp. 221-226.

Globular clusters in the inner regions of NGC 5128 (centaurus a). / Minniti, Dante; Victoria Alonso, M.; Goudfroou, Paul; Jablonka, Pascale; Meylan, Georges.

En: Astrophysical Journal, Vol. 467, N.º 1 PART I, 1996, p. 221-226.

Resultado de la investigación: Article

TY - JOUR

T1 - Globular clusters in the inner regions of NGC 5128 (centaurus a)

AU - Minniti, Dante

AU - Victoria Alonso, M.

AU - Goudfroou, Paul

AU - Jablonka, Pascale

AU - Meylan, Georges

PY - 1996

Y1 - 1996

N2 - We have identified 26 new globular cluster candidates in the inner 3 kpc of NGC 5128 (Centaurus A), the nearest known large galaxy that is the probable product of a merger. The clusters are selected on the basis of their structural parameters (observed core diameters and duplicities), as measured from archival Wide Field Planetary Camera (WFPC) Hubble Space Telescope (HST) images. IR photometry obtained with IRAC2B at the ESO/MPI 2.2 m telescope is combined with the optical HST photometry. Most of these clusters have normal colors typical of old globular clusters like those found in the Milky Way and M31. We estimate their metal abundances based on the R-K° color, confirming the existence of a metallicity gradient in the inner regions of NGC 5128. The presence of metal-rich globular clusters suggests that one of the colliding galaxies was a bulge-dominated galaxy (E or early S). A few clusters have colors and magnitudes similar to intermediate-age clusters containing carbon stars in the Magellanic Clouds. If the intermediate-age clusters were formed during a merger, then this episode must have occurred a few gigayears ago. Alternatively, we are looking at the cluster members of one of the colliding galaxies, which would then have been a late-type disk galaxy.

AB - We have identified 26 new globular cluster candidates in the inner 3 kpc of NGC 5128 (Centaurus A), the nearest known large galaxy that is the probable product of a merger. The clusters are selected on the basis of their structural parameters (observed core diameters and duplicities), as measured from archival Wide Field Planetary Camera (WFPC) Hubble Space Telescope (HST) images. IR photometry obtained with IRAC2B at the ESO/MPI 2.2 m telescope is combined with the optical HST photometry. Most of these clusters have normal colors typical of old globular clusters like those found in the Milky Way and M31. We estimate their metal abundances based on the R-K° color, confirming the existence of a metallicity gradient in the inner regions of NGC 5128. The presence of metal-rich globular clusters suggests that one of the colliding galaxies was a bulge-dominated galaxy (E or early S). A few clusters have colors and magnitudes similar to intermediate-age clusters containing carbon stars in the Magellanic Clouds. If the intermediate-age clusters were formed during a merger, then this episode must have occurred a few gigayears ago. Alternatively, we are looking at the cluster members of one of the colliding galaxies, which would then have been a late-type disk galaxy.

KW - Galaxies: abundances

KW - Galaxies: individual (NGC 5128)

KW - Galaxies: interactions galaxies: star clusters

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Minniti D, Victoria Alonso M, Goudfroou P, Jablonka P, Meylan G. Globular clusters in the inner regions of NGC 5128 (centaurus a). Astrophysical Journal. 1996;467(1 PART I):221-226.