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J/AJ/132/781   2MASS colours of Magellanic cloud star clusters   (Pessev+, 2006)

A database of 2MASS near-infrared colors of Magellanic cloud star clusters. Pessev P.M., Goudfrooij P., Puzia T.H., Chandar R. <Astron. J., 132, 781-800 (2006)> =2006AJ....132..781P
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, infrared Keywords: galaxies: star clusters - galaxies: stellar content - infrared: general - infrared: stars - Magellanic Clouds - techniques: photometric Abstract: The (rest-frame) near-IR domain contains important stellar population diagnostics and is often used to estimate masses of galaxies at low, as well as high, redshifts. However, many stellar population models are still relatively poorly calibrated in this part of the spectrum. To allow an improvement of this calibration we present a new database of integrated nearIR JHKs magnitudes for 75 star clusters in the Magellanic Clouds, using the Two Micron All Sky Survey (2MASS). The majority of the clusters in our sample have robust age and metallicity estimates from color-magnitude diagrams available in the literature, and populate a range of ages from 10Myr to 15Gyr and a range in [Fe/H] from -2.17 to +0.01dex. A comparison with matched star clusters in the 2MASS Extended Source Catalog (XSC) reveals that the XSC only provides a good fit to the unresolved component of the cluster stellar population. We also compare our results with the often-cited single-channel JHK photometry of Persson and coworkers (1983ApJ...266..105P). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 13 SMC cluster sample table2.dat 74 64 LMC cluster sample refs.dat 176 29 References table3.dat 110 76 2MASS Atlas Images of MC clusters table4.dat 85 679 Photometry of MC clusters
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/122/1844 : MSX and 2MASS cross-correlation in LMC (Egan+, 2001) J/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMC (Zaritsky+ 2002) J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+ 2004) Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Cluster name 13- 14 I2 h RAh Right ascension (J2000.0) (1) 16- 17 I2 min RAm Right ascension (J2000.0) (1) 19- 20 I2 s RAs Right ascension (J2000.0) (1) 22 A1 --- DE- Declination sign (J2000.0) (1) 23- 24 I2 deg DEd Declination (J2000.0) (1) 26- 27 I2 arcmin DEm Declination (J2000.0) (1) 29- 30 I2 arcsec DEs Declination (J2000.0) (1) 32- 36 F5.2 [yr] logAge Age for the cluster (2) 38- 41 F4.2 [yr] e_logAge ? rms uncertainty on logAge 43- 47 A5 --- r_logAge Reference for logAge, in refs.dat file 49- 53 F5.2 --- [Fe/H] ?=- Metallicity 55- 58 F4.2 --- e_[Fe/H] ? rms uncertainty on [Fe/H] 60- 64 A5 --- r_[Fe/H] Reference for [Fe/H], in refs.dat file 66- 69 F4.2 mag AV Extinction (3) 71- 74 F4.2 mag e_AV rms uncertainty on AV
Note (1): Positions are retrieved from the SIMBAD astronomical database. Note (2): The CMDs of the last three objects of table1 and the last 11 objects of table2 provide only a crude age estimation, and the errors are not given. Note (3): The extinction information is retrieved from the Web site of the MCPS.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 48 A25 --- Aut Author's name 50-176 A127 --- Com Comments
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Cloud Magellanic cloud (SMC or LMC) 5- 15 A11 --- Name Cluster identification 17 I1 --- Num Number of different sets of images retrieved 19- 48 A30 --- Jimage 2MASS J band image 50- 79 A30 --- Himage 2MASS H band image 81-110 A30 --- Kimage 2MASS Ks band image
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Cloud Magellanic cloud (SMC or LMC) 5- 15 A11 --- Name Cluster identification 17- 18 I2 h RAh Hour of Right Ascension (J2000) (1) 20- 21 I2 min RAm Minute of Right Ascension (J2000) (1) 23- 26 F4.1 s RAs Second of Right Ascension (J2000) (1) 28 A1 --- DE- Sign of the Declination (J2000)(1) 29- 30 I2 deg DEd Degree of Declination (J2000) (1) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000) (1) 35- 38 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 40- 44 F5.1 arcsec Offset Offset from SIMBAD cluster coordinates 46- 48 A3 --- Flag Source flag (2) 50- 52 I3 arcsec Rad Aperture radius 54- 58 F5.2 mag Jmag 2MASS J band magnitude 60- 63 F4.2 mag e_Jmag Error in Jmag (3) 65- 69 F5.2 mag Hmag 2MASS H band magnitude 71- 74 F4.2 mag e_Hmag Error in Hmag (3) 76- 80 F5.2 mag Kmag 2MASS Ks band magnitude 82- 85 F4.2 mag e_Kmag Error in Kmag (3)
Note (1): Used to center the apertures for the integral photometry. Note (2): Information about the age (first letter), metallicity estimates (second letter) and the photometry (third letter) for each cluster. A is corresponding to a reliable age, metallicity and photometry, B denotes the cases when the age and metallicity values are uncertain and when used in the third position B stands for the cases described in Section 2.7 or if the photometry was provided in aperture sizes smaller than 200". Note (3): The error of photometry in each band is calculated as a square root of the quadrature sum of the zero point error, internal error of the photometry, and the error due to stochastic fluctuations of the background stellar population.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008
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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