Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-08-16
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
17 pages, 8 figures, Accepted for publication in AJ, supplementary material will be available upon publication
Scientific paper
We present new measurements of the centers for 65 Milky Way globular clusters. Centers were determined by fitting ellipses to the density distribution within the inner $2\arcmin$ of the cluster center, and averaging the centers of these ellipses. The symmetry of clusters was also analyzed by comparing cumulative radial distributions on opposite sides of the cluster across a grid of trial centers. All of the determinations were done with stellar positions derived from a combination of two single-orbit ACS images of the core of the cluster in $F606W$ and $F814W$. We find that the ellipse-fitting method provides remarkable accuracy over a wide range of core sizes and density distributions, while the symmetry method is difficult to use on clusters with very large cores, or low density. The symmetry method requires a larger field, or a very sharply peaked density distribution.
Anderson Jeffrey
Dotter Aaron
Goldsbury Ryan
Richer Harvey B.
Sarajedini Ata
No associations
LandOfFree
The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-396900