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J/A+A/534/A96       Spitzer photometry of YSC in M33             (Sharma+, 2011)

The population of young stellar clusters throughout the disk of M33. Sharma S., Corbelli E., Giovanardi C., Hunt L.K., Palla F. <Astron. Astrophys. 534, A96 (2011)> =2011A&A...534A..96S
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, infrared Keywords: galaxies: individual: M33 - galaxies: ISM - galaxies: star clusters: general - galaxies: star formation Abstract: The properties of young stellar clusters (YSCs) in M33, identified from the center out to about twice the size of the bright star-forming disk, are investigated to determine possible spatial and time variations of the star formation process in this Local Group blue galaxy. 915 MIR sources have been extracted from the Spitzer 24um image. Upon inspection of Hα and GALEX images and exclusion of evolved AGB stars, a sample of 648 objects is selected as candidate YSCs and their luminosity function is examined. The spectral energy distribution of each object, based on aperture photometry, is compared with Starburst99 models to derive age, mass and AV of individual clusters. In the analysis we allow for different values of the upper mass cutoff of the stellar initial mass function (IMF), the porosity of the ISM, and the dustiness of HII regions. We also examine the influence of different dust models and include corrections for incompleteness of the IMF. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 33 407 Young Stellar Clusters in Verley et al. 2007 (Cat. J/A+A/476/1161) table2.dat 67 400 Additional 24µm source catalogue and YSCs
See also: J/AJ/110/2739 : H-alpha emitting regions in M33 (Calzetti+ 1995) J/A+A/476/1161 : Spitzer photometry of M33 (Verley+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/514] Sequential number of 24 micron source in M33, <[VHC2007b] IR NNN> in Simbad 5- 13 F9.6 deg RAdeg Right ascension in decimal degrees (J2000) 15- 23 F9.6 deg DEdeg Declination in decimal degrees (J2000) 25- 28 F4.1 arcsec Size Source size, semi-major axis of the ellipse fitted to the 8σ isophote 30- 33 F4.2 kpc RG Galactocentric radius
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [516/915] Sequential number of 24 micron source in M33, <[VHC2007b] IR NNN> in Simbad 5- 13 F9.6 deg RAdeg Right ascension in decimal degrees (J2000) 15- 23 F9.6 deg DEdeg Declination in decimal degrees (J2000) 25- 28 F4.1 arcsec Size Source size, semi-major axis of the ellipse fitted to the 8σ isophote 30- 37 F8.3 mJy F24um Spitzer/MIPS 24µm flux 39- 43 F5.3 mJy e_F24um rms uncertainty on F24um 45- 51 F7.3 mJy F8um ?=- Spitzer/IRAC 8µm flux 53- 57 F5.3 mJy e_F8um ?=- rms uncertainty on F8um 59- 63 F5.2 kpc RG Galactocentric radius 65- 67 A3 --- Note [YSC] YSC is for sources classified as Young Stellar Clusters and included in the analysis of YSC properties presented in the paper (1)
Note (1): Blank when the source cannot be classified as YSC because is outside the boundaries of one of the maps used for the identification of YSCs.
Acknowledgements: Edvige Corbelli, edvige(at)arcetri.astro.it References: Verley et al., Paper I 2007A&A...476.1161V, Cat. J/A+A/476/1161
(End) Patricia Vannier [CDS] 13-Sep-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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