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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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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