Globular clusters and cD formation - The case of M87

Details Globular clusters and cD formation - The case of M87 Globular clusters and cD formation - The case of M87

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409l..45m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 409, no. 2, p. L45-L48.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Photometry, Galactic Evolution, Galactic Halos, Globular Clusters, Virgo Galactic Cluster, Charge Coupled Devices, Luminous Intensity

Scientific paper

New wide-field CCD photometry around M87 is used to define the radial profile for its globular cluster system over the region of R values between 1.2 arcmin and 9.2 arcmin. The best-fit de Vaucouleurs profile clearly shows an excess of clusters beginning at R about 4.5 arcmin, just where the cD envelope of the M87 halo begins. We find that this 'extra' cD component of the globular cluster population has the same high specific frequency as the main body of M87 does; this result is used to argue for an epoch of cD envelope formation which precedes both the astration of the envelope and the relaxation of the Virgo Cluster itself.

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