M31 Globular Clusters in the [ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL] Archive. I. Cluster Detection and Completeness | Zendy

P. Barmby | Zendy; J. P. Huchra | Zendy

Open Access

M31 Globular Clusters in the [ITAL]HUBBLE SPACE TELESCOPE[/ITAL][ITAL]Hubble Space Telescope[/ITAL] Archive. I. Cluster Detection and Completeness

Author(s) -

P. Barmby,

J. P. Huchra

Publication year - 2001

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/323457

Subject(s) - globular cluster , physics , hubble space telescope , astrophysics , photometry (optics) , astronomy , spiral galaxy , star cluster , cluster (spacecraft) , galaxy , advanced camera for surveys , galaxy cluster , open cluster , stars , computer science , programming language

Globular clusters at the distance of M31 have apparent angular sizes of a fewarcseconds. While many M31 GCs have been detected and studied from ground-basedimages, the high spatial resolution of HST allows much more robust detectionand characterization of star cluster properties. We present the results of asearch of 157 HST/WFPC2 images of M31: we found 82 previously-catalogedglobular cluster candidates as well as 32 new globular cluster candidates and20 open cluster candidates. We present images of the new candidates andphotometry for all clusters. We assess existing cluster catalogs' completenessand use the results to estimate the total number of GCs in M31 as 460+/-70. Thespecific frequency is S_N = 1.2+/-0.2 and the mass specific frequency T =2.4+/-0.4; these values are at the upper end of the range seen for spiralgalaxies.Comment: Accepted to AJ. 33 pages with 6 figures, plus 4 separate figure

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