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J/AJ/148/4      JHK photometry of 913 globular clusters in M31     (Wang+, 2014)

New 2MASS near-infrared photometry for globular clusters in M31. Wang S., Ma J., Wu Z., Zhou X. <Astron. J., 148, 4 (2014)> =2014AJ....148....4W
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, infrared Keywords: catalogs - galaxies: individual: M31 - galaxies: spiral - galaxies: star clusters: general Abstract: We present Two Micron All Sky Survey JHKs photometry for 913 star clusters and candidates in the field of M31, which are selected from the latest Revised Bologna Catalog of M31 globular clusters (GCs) and candidates. The photometric measurements in this paper supplement this catalog, and provide the most comprehensive and homogeneous photometric catalog for M31 GCs in the JHKsbandpasses. In general, our photometry is consistent with previous measurements. The globular cluster luminosity function (GCLF) peaks for the confirmed GCs derived by fitting a t5distribution using the maximum likelihood method are J0=15.348-0.208+0.206, H0=14.703-0.180+0.176, and Ks0=14.534-0.146+0.142, all of which agree well with previous studies. The GCLFs are different between metal-rich (MR) and metal-poor (MP), and between inner and outer subpopulations, as MP clusters are fainter than their MR counterparts and the inner clusters are brighter than the outer ones, which confirm previous results. The NIR colors of the GC candidates are on average redder than those of the confirmed GCs, which leads to an obscure bimodal distribution of color indices. The relation of (V-Ks)0 and metallicity shows a notable departure from linearity, with a shallower slope toward the redder end. The color-magnitude diagram (CMD) and color-color diagram show that many GC candidates are located out of the evolutionary tracks, suggesting that some of them may be false M31 GC candidates. The CMD also shows that the initial mass function of M31 GCs covers a large range, and the majority of the clusters have initial masses between 103 and 106M. Description: We selected our sample globular clusters (GCs) and candidates from the latest Revised Bologna Catalog (RBC V.5; Galleti et al., 2005, cat. V/143). The JHKs photometric measurements in this paper supplement this catalog. We used 2MASS archival images of M31 in the JHKs bands to perform photometry. The images were retrieved using the 2MASS Batch Image Service (http://irsa.ipac.caltech.edu/applications/2MASS/IM/batch.html). Photometry for 627 objects was performed using the 2MASS-6X (cat. II/281) data, while photometry for the remaining 286 was performed using the All-Sky Release Survey (cat. VII/233) data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 73 913 Integrated measurements for 913 clusters in M31
See also: V/143 : Revised Bologna Catalog of M31 clusters, V.5 (Galleti+ 2012) II/281 : 2MASS 6X Point Source Working Database / Catalog (Cutri+ 2006) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) J/A+A/564/L3 : JHK photometry of NGC 3115 globular clusters (Cantiello+, 2014) J/ApJS/199/37 : GALEX catalog of star clusters in M31 (Kang+, 2012) J/AJ/141/61 : Star clusters in M31. II. (Caldwell+, 2011) J/ApJ/725/200 : An updated catalog of M31 globular-like clusters (Fan+, 2010) J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009) J/A+A/456/985 : Radial velocities of 76 M31 candidate clusters (Galleti+, 2006) J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006) J/AJ/131/1416 : IR Photometry of nearby globular clusters (Nantais+, 2006) J/A+A/416/917 : Revised Bologna Catalog of M31 GCs (Galleti+, 2004) J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000) http://irsa.ipac.caltech.edu/applications/2MASS/IM/batch.html : 2MASS Batch Image Service Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Cluster identifier 11- 16 F6.3 mag Jmag ? 2MASS J band magnitude (1) 18- 22 F5.3 mag e_Jmag ? Uncertainty in Jmag 24- 29 F6.3 mag Hmag ? 2MASS H band magnitude (1) 31- 35 F5.3 mag e_Hmag ? Uncertainty in Hmag 37- 42 F6.3 mag Ksmag ? 2MASS Ks band magnitude (1) 44- 48 F5.3 mag e_Ksmag ? Uncertainty in Ksmag 50- 53 F4.1 arcsec r Aperture radius 55- 59 F5.2 mag E(B-V) The (B-V) color excess 61 I1 --- r_E(B-V) Reference for E(B-V) (2) 63- 67 F5.2 [Sun] [Fe/H]C ?=99.99 Metallicity from Caldwell et al. 2011 (cat. J/AJ/141/61) 69- 73 F5.2 [Sun] [Fe/H]K ?=99.99 Metallicity from Kang et al. 2012 (cat. J/ApJS/199/37)
Note (1): Photometry for 627 objects was performed using the 2MASS-6X (cat. II/281) data, while photometry for the remaining 286 was performed using the All-Sky Release Survey (cat. VII/233) data. Note (2): References for the reddening values are defined as follows: 1 = Caldwell et al. (2009, cat. J/AJ/137/94; 2011, cat. J/AJ/141/61); 2 = Fan et al. (2008MNRAS.385.1973F); 3 = Barmby et al. 2000 (cat. J/AJ/119/727); 4 = Fan et al. 2010 (cat. J/ApJ/725/200); 5 = Mean reddening value of clusters located within an annulus at every 2kpc radius from the center of M31; 6 = Foreground reddening value of E(B-V)=0.13mag.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 08-Oct-2014
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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