M31 Globular Clusters in the HST Archive: II. Structural Parameters

Abstract

We analyze the structural parameters of the largest-available sample of spatially resolved extragalactic globular clusters. The images of M31 GCs were found in a search of HST archival data, described in a companion paper. We measure the ellipticities and position angles of the clusters and conclude that the ellipticities are consistent with being caused by rotation. We find that most clusters' surface brightness distributions are well-fit by two-dimensional single-mass Michie-King models. A few clusters show possible power-law distributions characteristic of core-collapse, but the spatial resolution is not high enough to make definitive claims. As has been found for other galaxies, the metal-rich clusters are slightly smaller than the metal-poor clusters. There are strong correlations between structural properties of M31 GCs, as for Milky Way clusters, and the two populations are located close to the same `fundamental plane' in parameter space.

Accepted to AJ; 33 pages including 12 figures and 3 tables

References in corpus (12)

• Properties of Globular Cluster Systems in Nearby Early-type Galaxies
• M31 Globular Clusters: Colors and Metallicities
• Mayall II = G1 in M31: Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy ?
• The Globular Cluster System in the Inner Region of M87
• Binding Energy and the Fundamental Plane of Globular Clusters
• M31 Globular Clusters in the HST Archive: I. Cluster Detection and Completeness
• The Stellar Populations of Pixels and Frames
• The M31 Globular Cluster Luminosity Function
• Deep HST V- and I-Band Observations of Two Globular Clusters in the Halo of M31
• Some Musings on Globular Cluster Systems
• Hubble Space Telescope Observations of Globular Clusters in M31 II: Structural Parameters
• The Fundamental Straight Line of Galactic Globular Clusters

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