The star cluster population of NGC 5253

被引:37
作者
Cresci, G
Vanzi, L
Sauvage, M
机构
[1] Univ Florence, Dipartimento Astron, I-50125 Florence, Italy
[2] ESO, Santiago 19001, Chile
[3] Ctr Etud Saclay, Serv Astrophys, CEA, DSM,DAPNIA, F-91191 Gif Sur Yvette, France
关键词
galaxies : individual : NGC 5253; galaxies : star clusters; galaxies : starburst;
D O I
10.1051/0004-6361:20041028
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a detailed analysis of the star cluster population in the starburst galaxy NGC 5253. Our work is based on HST optical and VLT Ks images. We detect more than 300 clusters, and for all of them we derive the photometry in the V, I and Ks bands and built a color - color V - I/V - Ks diagram. After correction for star contamination, we matched 115 sources in all the three bands V, I and Ks. Comparison of the data points with models shows that most of the sources are affected by a red excess. The ages of the younger clusters are obtained from an HST Ha image which makes it possible to partially remove the degeneracy between age and extinction and to calculate the screen optical depth toward the clusters. The V and Ks luminosity functions show a marked turnover at M-V = - 7.3 and M-K = - 10.2, with a shape roughly similar to the Gaussian distribution of old globular clusters. We convert the luminosity function into a mass function, and find that the clusters younger than 10 Myr show a power law distribution with slope - 1.6, while the distribution of the older clusters has a maximum at about 4 x 10(4) M-..
引用
收藏
页码:447 / 454
页数:8
相关论文
共 41 条
[1]   Star cluster formation and evolution in the dwarf starburst galaxy NGC 1569 [J].
Anders, P ;
de Grijs, R ;
Fritze-von Alvensleben, U ;
Bissantz, N .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 347 (01) :17-28
[2]  
Baggett S., 2002, HST WFPC2 DATA HDB V
[3]   The central star cluster of the star-forming dwarf galaxy NGC 5253 [J].
Beck, SC ;
Ho, PTP ;
Lacy, JH ;
Kelly, DM .
ASTROPHYSICAL JOURNAL, 1996, 457 (02) :610-615
[4]   SExtractor: Software for source extraction [J].
Bertin, E ;
Arnouts, S .
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1996, 117 (02) :393-404
[5]   Compact star clusters in nearby dwarf irregular galaxies [J].
Billett, OH ;
Hunter, DA ;
Elmegreen, BG .
ASTRONOMICAL JOURNAL, 2002, 123 (03) :1454-1475
[6]   Star cluster formation and disruption time-scales - I. An empirical determination of the disruption time of star clusters in four galaxies [J].
Boutloukos, SG ;
Lamers, HJGLM .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2003, 338 (03) :717-732
[7]   STAR FORMATION IN NGC-5253 [J].
CALDWELL, N ;
PHILLIPS, MM .
ASTROPHYSICAL JOURNAL, 1989, 338 (02) :789-&
[8]   Dust and recent star formation in the core of NGC 5253 [J].
Calzetti, D ;
Meurer, GR ;
Bohlin, RC ;
Garnett, DR ;
Kinney, AL ;
Leitherer, C ;
StorchiBergmann, T .
ASTRONOMICAL JOURNAL, 1997, 114 (05) :1834-+
[9]   THE STELLAR POPULATIONS AND EVOLUTION OF HII GALAXIES .1. HIGH SIGNAL-TO-NOISE OPTICAL SPECTROSCOPY [J].
CAMPBELL, A ;
TERLEVICH, R ;
MELNICK, J .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1986, 223 (04) :811-825
[10]  
de Grijs R, 2003, ASTRON GEOPHYS, V44, P14