Structural Parameters from Ground-Based Observations of Newly Discovered Globular Clusters in NGC 5128

Details Structural Parameters from Ground-Based Observations of Newly Discovered Globular Clusters in NGC 5128 Structural Parameters from Ground-Based Observations of Newly Discovered Globular Clusters in NGC 5128

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..181g&link_type=abstract

XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S

Astronomy and Astrophysics

Astronomy

Scientific paper

We have investigated globular cluster candidates in the giant elliptical galaxy NGC 5128. We used the Magellan I telescope + MagIC camera under excellent seeing conditions (0.3 arcsec-0.6 arcsec) and obtained very high resolution images for a sample of 44 candidates. Our images allow us to study the light profiles of the likely clusters, all of which are well resolved. This is the first ground-based study of structural parameters for globular clusters outside the Local Group. We compare the psf-deconvolved profiles with King models and derive structural parameters and surface brightnesses. Our clusters extend to higher ellipticities and larger half-light radii than their Galactic counterparts, as do the HST sample in NGC 5128 observed by Harris et.2002). The combined sample fills in the gaps previously existing in r_h - M_V parameter space and indicates that any substantial difference between presumed distinct cluster types is now removed and that clusters form a continuum in this diagram. Indeed, this continuum now extends to the realm of the Ultra Compact Dwarfs.

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