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J/ApJ/703/1872     Compact star clusters in the M31 disk    (Vansevicius+, 2009)

Compact star clusters in the M31 disk. Vansevicius V., Kodaira K., Narbutis D., Stonkute R., Bridzius A., Deveikis V., Semionov D. <Astrophys. J., 703, 1872-1883 (2009)> =2009ApJ...703.1872V
ADC_Keywords: Clusters, globular ; Galaxies, nearby ; Photometry Keywords: galaxies: individual (M31) - galaxies: star clusters - stars: formation Abstract: We have carried out a survey of compact star clusters (apparent size ≲3") in the southwest part of the M31 galaxy, based on the high-resolution Suprime-Cam images (17.5'x28.5'), covering ∼15% of the deprojected galaxy disk area. The UBVRI photometry of 285 cluster candidates (V≲20.5mag) was performed using frames of the Local Group Galaxies Survey. The final sample, containing 238 high probability star cluster candidates (typical half-light radius rh∼1.5pc), was selected by specifying a lower limit of rh≳0.15" (≳0.6pc). We derived cluster parameters based on the photometric data and multiband images by employing simple stellar population models. The clusters have a wide range of ages from ∼5Myr (young objects associated with 24um and/or Hα emission) to ∼10Gyr (globular cluster candidates), and possess mass in a range of 3.0≲log(m/m)≲4.3 peaking at m∼4000m. Typical age of these intermediate-mass clusters is in the range of 30Myr≲t≲3Gyr, with a prominent peak at ∼70Myr. These findings suggest a rich intermediate-mass star cluster population in M31, which appears to be scarce in the Milky Way galaxy. Description: We have identified high probability star cluster candidates (hereafter star clusters) by visually inspecting the Subaru/Suprime-Cam V-band mosaic image made from 5x2 minute individual exposures of the 17.5'x28.5' field, centered at J0040.9+4045. The characteristic full width at half maximum (FWHM) of stellar images (point-spread function, PSF) is 0.7". File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 60 238 Evolutionary and structural parameters of high probability star cluster candidates in the southwest part of the M31 disk
See also: B/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007) J/PASP/122/745 : HST WFPC2 star clusters in M31. III. (Hodge+, 2010) J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009) J/A+A/507/1375 : HST/ACS VI data of M31 globular clusters (Perina+, 2009) J/A+A/508/1285 : Metallicity estimates of M31 globular clusters (Galleti+, 20009) J/ApJS/177/174 : Star clusters in M31 (Narbutis+, 2008) J/PASP/120/1 : HST WFPC2 star clusters in M31. II. (Krienke, 2008) J/A+A/471/127 : New globular clusters in M31 (Galleti+, 2007) J/PASP/119/7 : HST WFPC2 star clusters in M31 (Krienke+, 2007) J/PASJ/56/1025 : Compact star clusters in SW field of M31 (Kodaira+, 2004) J/ApJ/559/851 : Young star cluster candidates in M31 (Williams+, 2001) J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- [NVK2008] Candidate identification (KWNNN) (1) 7- 14 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 16- 23 F8.5 deg DEdeg Declination in decimal degrees (J2000) (1) 25- 29 F5.1 mag VMag Absolute V band magnitude (2) 31- 34 F4.2 [Myr] logt Log of the age 36- 39 F4.2 [Msun] logM Log of the mass 41- 44 F4.1 [-] [M/H] Metallicity 46- 49 F4.2 mag E(B-V) The B-V color excess (3) 51- 54 F4.1 pc rh Average half-light radius (4) 56- 60 A5 --- Note Object is discussed in the Appendix (5)
Note (1): According to Narbutis et al. (2008, Cat. J/ApJS/177/174; <[NVK2008] KWNNN> in Simbad). Note (2): Corrected for aperture correction. Note (3): Interstellar extinction in Milky Way plus M31. Note (4): Average half-light radius in pc, where rh=(rhK+rhE)/2, derived from the King and EFF models. Note (5): Cross-reference with The Revised Bologna Catalog of M31 Globular Clusters and candidates compiled by Galleti et al. (2007, Cat. J/A+A/471/127; <Bol NNN> in Simbad) when available.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Nov-2011
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