Astronomy and Astrophysics, volume 473, 429-436 (2007/10-2)
The extended structure of the remote cluster B514 in M 31. Detection of extra-tidal stars.
FEDERICI L., BELLAZZINI M., GALLETI S., FUSI PECCI F., BUZZONI A. and PARMEGGIANI G.
Abstract (from CDS):
We present a study of the density profile of the remote M 31 globular cluster B514, obtained from HST/ACS observations. By coupling analysis of the distribution of the integrated light with star counts, we are able to 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 rc=0.38", this corresponds to a tidal radius of rt∼17" (∼65pc). The analysis of the light profile also allows an estimate of the ellipticity and position angle of the isophotes within r≤20". We find that both the light and the star-count profiles show a departure from the best-fit King model for r>8" - as a surface brightness excess at large radii, and the star-count profile shows a clear break in the correspondence of the estimated tidal radius. Both features are interpreted as the signature of the presence of extra tidal stars around the cluster. It is also shown that B514 has a significantly larger half-light radius than ordinary globular clusters of the same luminosity. In the MV vs. logrh plane, B514 lies in a region inhabited by peculiar clusters, like ω Cen, G1, NGC 2419 and others, as well as by the nuclei of dwarf elliptical galaxies.
galaxies: individual: M 31 - galaxies: star clusters - catalogs - galaxies: local group - stellar dynamics
VizieR on-line data:
<Available at CDS (J/A+A/473/429): table5.dat>
Table 5: [FBG2007] NNNN (Nos 1-1662).
Status at CDS
All or part of tables of objects will not be ingested in SIMBAD.
View the reference in ADS
To bookmark this query, right click on this link: simbad:2007A&A...473..429F and select 'bookmark this link' or equivalent in the popup menu