J/A+A/456/985 Radial velocities of 76 M31 candidate clusters (Galleti+, 2006)
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., Fusi Pecci F.
<Astron. Astrophys. 456, 985 (2006)>
=2006A&A...456..985G 2006A&A...456..985G
ADC_Keywords: Clusters, globular ; Photometry ; Radial velocities
Keywords: galaxies: individual: M31 - galaxies: star clusters -
galaxies: Local Group
Abstract:
We present the first results of a large spectroscopic survey of
globular clusters and candidate globular clusters in the nearby M31
galaxy. The survey is aimed at the classification of known candidate
M31 clusters and at the study of their kinematic properties. We
obtained low-resolution spectroscopy for 133 targets, including 76
yet-to-be-confirmed candidate clusters (i.e. with no previous
spectroscopic information), 55 already-confirmed genuine M31 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 M31 clusters, 12 background galaxies, 17 foreground Galactic
stars, 2 HII regions belonging to M31 and 3 unclassified (possibly M31
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 M31 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 M31 galaxy
is still far from complete even in terms of simple membership.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 57 1164 Radial Velocities for M31 globular clusters
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See also:
J/A+A/416/917 : Revised Bologna Catalog of M31 glob. clusters (Galleti+, 2004)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Name (as in Galleti et al., 2004,
Cat. J/A+A/416/917)
8 I1 --- f Flag of the real nature of the entry (1)
10 I1 --- y Flag of the possible young clusters (2)
12- 14 A3 --- Class Classification Quality, from A to E in the
sense of decreasing confidence level
16- 20 F5.2 mag Vmag ? V magnitude
22- 26 F5.2 mag V-K ? V-K colour index
28- 32 I5 km/s HRV ? Heliocentric radial velocity
34- 38 I5 km/s e_HRV ? rms uncertainty on HRV (3)
40- 57 A18 ---- r_HRV Reference (4)
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Note (1): Flags on real nature of the entry as follows:
1 = confirmed GC
2 = GC candidates
3 = Controversial object
4 = confirmed galaxy
5 = confirmed H II Region
6 = confirmed star
7 = asterism (star-pattern that is not a constellation)
Note (2): Flag of possible young clusters as follows:
0 = Fusi Pecci et al. (2005AJ....130..554F 2005AJ....130..554F) Table 1
1 = sample A (B-V)<0.55
2 = sample B (Hbeta>3.5)
3 = sample A +B
4 = young from other source Table 2 of Fusi Pecci et al.
(2005AJ....130..554F 2005AJ....130..554F)
5 = candidates Table 3 of Fusi Pecci et al. (2005AJ....130..554F 2005AJ....130..554F)
Note (3): All errors that are <1 have been reported as 1.
Note (4): The acronyms of entries excluded from the computation of
the weighted mean are enclosed in parentheses. Acronyms are:
HR = Dubath & Grillmair, 1997A&A...321..379D 1997A&A...321..379D and Peterson et al.,
1989, in Dynamics of dense stellar systems; Proceedings of
the Workshop, Toronto, Canada, May 27, 28, 1988. Cambridge,
England and New York, Cambridge University Press, p. 161-166.
DG97 = Dubath & Grillmair, 1997A&A...321..379D 1997A&A...321..379D
P89 = Peterson et al., 1989dynamicofdenseP
H91 = Huchra et al., 1991ApJ...370..495H 1991ApJ...370..495H
H93 = Huchra et al., 1993ASPC...48..420H 1993ASPC...48..420H
F93 = Federici et al., 1993A&A...274...87F 1993A&A...274...87F
J98 = Jablonka et al., 1998A&A...335..867J 1998A&A...335..867J
B00 = Barmby et al., 2000AJ....119..727B 2000AJ....119..727B
P02 = Perrett et al., 2002AJ....123.2490P 2002AJ....123.2490P
G05 = Galleti et al., 2005A&A...436..535G 2005A&A...436..535G
G06 = This work
V69 = van den Bergh, 1969ApJS...19..145V 1969ApJS...19..145V
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Acknowledgements: Silvia Galleti, silvia.galleti2(at)unibo.it
(End) Silvia Galleti [INAF-OABO], Patricia Vannier [CDS] 23-Jun-2006