The M31 globular cluster luminosity function

被引:70
作者
Barmby, P
Huchra, JP
Brodie, JP
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Univ Calif Santa Cruz, Lick Observ, Santa Cruz, CA 95064 USA
关键词
galaxies : individual (M31); galaxies : star clusters; globular clusters : general;
D O I
10.1086/319389
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We combine our compilation of photometry of M31 globular clusters and probable cluster candidates with new near-infrared photometry for 30 objects. Using these data we determine the globular cluster luminosity function (GCLF) in multiple filters for the M31 halo clusters. We find a GCLF peak and dispersion V-0(0) = 16.84 +/- 0.11, sigma (iota) =0.93 +/- 0.13 (Gaussian sigma = 1.20 +/- 0.14), consistent with previous results. The halo GCLF peak colors (e.g., B-0(0) - V-0(0)) are consistent with the average cluster colors. We also measure V-band GCLF parameters for several other subsamples of the M31 globular cluster population. The inner third of the clusters have a GCLF peak significantly brighter than that of the outer clusters (DeltaV(0) approximate to 0.5 mag). Dividing the sample by both galactocentric distance and metallicity, we find that the GCLF also varies with metallicity, as the metal-poor clusters are on average 0.36 mag fainter than the metal-rich clusters. Our modeling of the catalog selection effects suggests that they are not the cause of the measured GCLF differences, but a more complete, less contaminated M31 cluster catalog is required for confirmation. Our results imply that dynamical destruction is not the only factor causing variation in the M31 GCLF: metallicity, age, and cluster initial mass function may also be important.
引用
收藏
页码:1482 / 1496
页数:15
相关论文
共 74 条
[61]   Maps of dust infrared emission for use in estimation of reddening and cosmic microwave background radiation foregrounds [J].
Schlegel, DJ ;
Finkbeiner, DP ;
Davis, M .
ASTROPHYSICAL JOURNAL, 1998, 500 (02) :525-553
[62]   A MAXIMUM-LIKELIHOOD ANALYSIS OF GLOBULAR-CLUSTER LUMINOSITY DISTRIBUTIONS IN THE VIRGO ELLIPTICALS [J].
SECKER, J ;
HARRIS, WE .
ASTRONOMICAL JOURNAL, 1993, 105 (04) :1358-1368
[63]   A STATISTICAL INVESTIGATION INTO THE SHAPE OF THE GLOBULAR-CLUSTER LUMINOSITY DISTRIBUTION [J].
SECKER, J .
ASTRONOMICAL JOURNAL, 1992, 104 (04) :1472-1481
[64]  
SECKER J, 1997, DOCUMENTATION VERSIO
[65]  
SHAROV AS, 1989, ASTRON ZH+, V66, P241
[66]  
SUNTZEFF N, 1993, ASTR SOC P, V48, P167
[67]   Multiple-beam wide-field infrared cameras for the MMT and Whipple Observatories [J].
Tollestrup, EV ;
Willner, SP .
INFRARED ASTRONOMICAL INSTRUMENTATION, PTS 1-2, 1998, 3354 :502-511
[68]   THE LUMINOSITY FUNCTION OF GLOBULAR-CLUSTERS [J].
VANDENBERGH, S .
ASTROPHYSICAL JOURNAL, 1985, 297 (02) :361-364
[69]   Evolution of the mass function of the Galactic globular cluster system [J].
Vesperini, E .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 299 (04) :1019-1039
[70]  
VETESNIK M, 1962, B ASTRON I CZECH, V13, P218