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J/ApJ/679/404              Star clusters in M82                   (Mayya+, 2008)

HST ACS imaging of M82: a comparison of mass and size distribution functions of the younger nuclear and older disk clusters. Mayya Y.D., Romano R., Rodriguez-Merino L.H., Luna A., Carrasco L., Rosa-Gonzalez D. <Astrophys. J., 679, 404-419 (2008)> =2008ApJ...679..404M
ADC_Keywords: Associations, stellar ; Photometry, HST ; Extinction Keywords: catalogs - galaxies: individual (M82) - galaxies: star clusters Abstract: We present the results obtained from an objective search for stellar clusters, both in the currently active nuclear starburst region, and in the poststarburst disk of M82. Images obtained with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) in F435W (B), F555W (V), and F814W (I) filters were used in the search for the clusters. We detected 653 clusters, of which 393 are located outside the central 450pc in the poststarburst disk of M82. The luminosity function of the detected clusters shows an apparent turnover at B=22mag (MB=-5.8), which we interpret from Monte Carlo simulations as due to incompleteness in the detection of faint clusters, rather than an intrinsic lognormal distribution. We derived a photometric mass of every detected cluster from models of simple stellar populations assuming a mean age of either 8 (nuclear clusters) or 100 (disk clusters) million years old. The mass functions of the disk (older) and the nuclear (younger) clusters follow power laws, the former being marginally flatter (α=1.5±0.1) than the latter (α=1.8±0.1). The distribution of sizes (FWHM) of clusters brighter than the apparent turnover magnitude (mass≳2x104M) can be described by a lognormal function. Description: The data were obtained by the Hubble Heritage Team using the ACS Wide Field Channel in 2006 March, and released in fits format. Observations consisted of 96 individual exposures in F435W, F555W, F814W, and F658N filters covering a field of view of 8'x8' centered on the galaxy nucleus, and cover the entire optical disk of the galaxy. Objects: ------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------- 09 55 52.2 +69 40 49 M82 = NAME CIGAR GALAXY = NGC 3034 ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 66 653 Photometric properties of detected star clusters in M82
See also: J/AJ/121/768 : BVIJH photometry of M82 (de Grijs+, 2001) J/ApJ/619/270 : Young super star clusters in the starburst of M82 (Melo+, 2005) J/ApJ/667/L145 : HST Photometry of M82 region B (Smith+, 2007) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [MRR2008] Object identification (1) 6- 10 F5.2 mag Bmag HST/ACS F435W (B band) magnitude 12- 15 F4.2 mag e_Bmag Formal SExtractor error in Bmag (2) 17- 20 F4.2 mag B-V ? The (B-V) color index 22- 25 F4.2 mag V-I The (V-I) color index 27- 30 F4.2 mag AV The V band extinction 32- 35 F4.2 mag e_AV ? Error in AV 37- 42 F6.2 mag BMAG The absolute B band magnitude 44- 47 F4.2 mag e_BMAG ? Formal SExtractor error in BMag (2) 49- 52 F4.2 [solMass] logM Log of cluster mass 54- 57 F4.2 [solMass] e_logM ? Error in logM 59- 66 A8 --- OID Other identification (3)
Note (1): The IDs run from 1N to 265N for the nuclear clusters, followed by 1D to 393D for the disk ones (5 nuclear clusters 84N, 139N, 147N, 149N and 258N were rejected as the error on at least one of the colors was unreasonably high). The clusters are arranged in increasing order of B magnitude, separately for the nuclear and disk sources. Note (2): The systematic errors due to an improper background subtraction, which affects a magnitude measurement, and not a color measurement, could be as large as 0.2∼mag for sources fainter than B=21 mag. Note (3): the first letter indicate the source catalog. M = Melo et al. (2005, Cat. J/ApJ/619/270) H = O'Connell & Mangano (1978ApJ...221...62O) (<[OM78] A> in Simbad); B = Smith et al. (2006MNRAS.370..513S) (<[SWG2006] BN-N> or <[SWG2006] A1, F or L> in Simbad) Only sources that can be associated uniquely with a cluster in our list are identified.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Oct-2010
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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