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 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 1983ApJ...266..105P).
File Summary:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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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.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 48 A25 --- Aut Author's name
50-176 A127 --- Com Comments
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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)
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008