Structural parameters of the messier 87 globular clusters

Juan P. Madrid, William E. Harris, John P. Blakeslee, Matías Gómez

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

19 Citas (Scopus)

Resumen

We derive structural parameters for ∼ 2000 globular clusters in the giant Virgo elliptical Messier 87 (M87) using extremely deep Hubble Space Telescope images in F606W (V) and F814W (I) taken with the ACS/WFC. The cluster scale sizes (half-light radii rh) and ellipticities are determined from point-spread-function -convolved King-model profile fitting. We find that the rh distribution closely resembles the inner Milky Way clusters, peaking at rh ≃ 2.5 pc and with virtually no clusters more compact than rh ≃ 1 pc. The metal-poor clusters have on average an rh 24% larger than the metal-rich ones. The cluster scale size shows a gradual and noticeable increase with galactocentric distance. Clusters are very slightly larger in the bluer waveband V, a possible hint that we may be beginning to see the effects of mass segregation within the clusters.We also derived a color magnitude diagram for the M87 globular cluster system which shows a striking bimodal distribution.

Idioma originalInglés
Páginas (desde-hasta)237-244
Número de páginas8
PublicaciónAstrophysical Journal
Volumen705
N.º1
DOI
EstadoPublicada - 1 nov 2009

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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