Astronomy and Astrophysics, volume 456, 985-999 (2006/9-4)
An updated survey of globular clusters in M 31. I. Classification and radial velocity for 76 candidate clusters.
GALLETI S., FEDERICI L., BELLAZZINI M., BUZZONI A. and FUSI PECCI F.
Abstract (from CDS):
We present the first results of a large spectroscopic survey of globular clusters and candidate globular clusters in the nearby M 31 galaxy. The survey is aimed at the classification of known candidate M 31 clusters and at the study of their kinematic properties. We obtained low-resolution spectroscopy (λ/Δλ≃800-1300) for 133 targets, including 76 yet-to-be-confirmed candidate clusters (i.e. with no previous spectroscopic information), 55 already-confirmed genuine M 31 clusters, and 2 uncertain candidates. Our observations allowed a reliable estimate of the target radial velocity, within a typical accuracy of ~±20km/s. The observed candidates have been robustly classified according to their radial velocity and shape parameters that allowed us to confidently discriminate between point sources and extended objects even from low-spatial-resolution imagery. In our set of 76 candidate clusters we found: 42 newly-confirmed bona-fide M 31 clusters, 12 background galaxies, 17 foreground Galactic stars, 2 HII regions belonging to M 31 and 3 unclassified (possibly M 31 clusters or foreground stars) objects. The classification of a few other candidates not included in our survey has been also reassessed on various observational bases. All the sources of radial velocity estimates for M 31 known globular clusters available in the literature have been compared and checked, and a homogeneous general list has been obtained for 349 confirmed clusters with radial velocity. Our results suggest that a significant number of genuine clusters (>100) is still hidden among the plethora of known candidates proposed by various authors. Hence our knowledge of the globular cluster system of the M 31 galaxy is still far from complete even in terms of simple membership.
galaxies: individual: M 31 - galaxies: star clusters - galaxies: Local Group
VizieR on-line data:
<Available at CDS (J/A+A/456/985): table5.dat>
Fig.10: Bol NNN (No. 515) added.
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