The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars

Details The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars

2007-06-15

arxiv.org/abs/0706.2337v1

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures. Accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20077122

We present a study of the density profile of the remote M31 globular cluster B514, obtained from HST/ACS observations. Coupling the analysis of the distribution of the integrated light with star counts we can reliably follow the profile of the cluster out to r~35", corresponding to ~130pc. The profile is well fitted, out to ~15 core radii, by a King Model having C=1.65. With an estimated core radius r_c=0.38", this corresponds to a tidal radius of r_t~17" (~65pc). We find that both the light and the star counts profiles show a departure from the best fit King model for r>~8" - as a surface brightness excess at large radii, and the star counts profile shows a clear break in correspondence of the estimated tidal radius. Both features are interpreted as the signature of the presence of extratidal stars around the cluster. We also show that B514 has a half-light radius significantly larger than ordinary globular clusters of the same luminosity. In the M_V vs. log r_h plane, B514 lies in a region inhabited by peculiar clusters, like Omega Cen, G1, NGC2419 and others, as well as by the nuclei of dwarf elliptical galaxies.

Affiliated with

Also associated with

No associations

Rating

The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars 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 extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The extended structure of the remote cluster B514 in M31. Detection of extra-tidal stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-550099