J/ApJS/199/37 GALEX catalog of star clusters in M31 (Kang+, 2012)
A comprehensive GALEX ultraviolet catalog of star clusters in M31 and a study
of the young clusters.
Kang Y., Rey S.-C., Bianchi L., Lee K., Kim Y., Sohn S.T.
<Astrophys. J. Suppl. Ser., 199, 37 (2012)>
=2012ApJS..199...37K 2012ApJS..199...37K
ADC_Keywords: Clusters, globular ; Photometry, UBVRI ; Photometry, infrared ;
Photometry, ultraviolet ; Abundances, [Fe/H] ; Reddening
Keywords: galaxies: evolution - galaxies: individual (M31) -
galaxies: interactions - galaxies: star clusters: general -
ultraviolet: galaxies
Abstract:
We present a comprehensive catalog of 700 confirmed star clusters in
the field of M31 compiled from three major existing catalogs. We
detect 418 and 257 star clusters in Galaxy Evolution Explorer
near-ultraviolet and far-ultraviolet (FUV) imaging, respectively. Our
final catalog includes photometry of star clusters in up to 16
passbands ranging from FUV to NIR as well as ancillary information
such as reddening, metallicity, and radial velocities. In particular,
this is the most extensive and updated catalog of UV-integrated
photometry for M31 star clusters. Ages and masses of star clusters are
derived by fitting the multi-band photometry with model spectral
energy distribution (SED); UV photometry enables more accurate age
estimation of young clusters. Our catalog includes 182 young clusters
with ages less than 1Gyr. Our estimated ages and masses of young
clusters are in good agreement with previously determined values in
the literature. The mean age and mass of young clusters are about
300Myr and 104M☉, respectively.
Description:
We construct a new compiled catalog of star clusters in M31 carefully
considering three previously published catalogs: RBC version 4 (v4;
see also Galleti et al., 2004, Cat. J/A+A/416/917), Caldwell et al.
(2009, Cat. J/AJ/137/94, 2011AJ....141...61C 2011AJ....141...61C), and Peacock et al.
(2010, Cat. J/MNRAS/402/803). In this paper, we only consider 700 star
clusters that are classified as confirmed star clusters at least in
one of the three catalogs.
We used UV images from the Nearby Galaxy Survey (NGS) obtained by
GALEX in two UV bands: far-ultraviolet (FUV; 1350-1750Å) and
near-ultraviolet (NUV; 1750-2750Å). A total of 23 images (about
17deg2) have covered most of the disk and halo of M31. The details
of the GALEX observations for M31 are presented in Rey et al.
(2005ApJ...619L.119R 2005ApJ...619L.119R, 2007, Cat. J/ApJS/173/643).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 226 700 Merged catalog of star clusters in M31
table2.dat 61 182 Catalog of 182 young clusters
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See also:
J/A+A/531/A155 : HST photometry in six M31 globular clusters (Perina+, 2011)
J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)
J/AJ/140/1043 : GCs in M31 and the Galaxy (van den Bergh+, 2010)
J/AJ/139/1438 : SED and age estimates of M31 globular clusters (Wang+, 2010)
J/ApJ/725/200 : An updated catalog of M31 globular-like clusters (Fan+, 2010)
J/AJ/138/1667 : HST survey of young clusters in M31. III. (Barmby+, 2009)
J/AJ/137/94 : Star clusters in M31 (Caldwell+, 2009)
J/MNRAS/392/L55 : GCs in M31 from K-band photometry (Peacock+, 2009)
J/A+A/508/1285 : Metallicity estimates of M31 GCs (Galleti+, 2009)
J/A+A/507/1375 : HST/ACS VI data of M31 globular clusters (Perina+, 2009)
J/ApJS/173/643 : GALEX UV photometry of M31 Globular Clusters (Rey+, 2007)
J/A+A/471/127 : New globular clusters in M31 (Galleti+, 2007)
J/AJ/133/2764 : M31 globular clusters structural parameters (Barmby+, 2007)
J/A+A/456/985 : RVs of 76 M31 candidate clusters (Galleti+, 2006)
J/A+A/449/143 : Photometry of M31 globular cluster candidates (Ma+, 2006)
J/A+A/416/917 : Revised Bologna Catalog of M31 GCs (RBC) (Galleti+, 2004)
J/AJ/123/2490 : RV and [Fe/H] of M31 GC system (Perrett+, 2002)
J/AJ/122/2458 : M31 globular clusters from HST (Barmby+, 2001)
J/AJ/119/727 : M31 globular clusters photometry (Barmby+, 2000)
J/AJ/114/1488 : Globulars in M31 (Holland+ 1997)
J/A+AS/116/447 : M31 globulars clusters ellipticities (Staneva+, 1996)
http://www.bo.astro.it/M31/ : RBC v4 online data
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of star cluster
12- 13 I2 h RAh [0/11] Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- [+] Sign of Declination (J2000)
25- 26 I2 deg DEd [32/44] Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
37- 41 F5.2 mag FUVmag ?=99.99 GALEX FUV (1350-1750Å) AB magnitude
44- 48 F5.2 mag e_FUVmag ?=99.99 Uncertainty in FUVmag
51- 55 F5.2 mag NUVmag ?=99.99 GALEX NUV (1750-2750Å) AB magnitude
58- 62 F5.2 mag e_NUVmag ?=99.99 Uncertainty in NUVmag
65- 69 F5.2 mag Umag ?=99.99 The RBC U band magnitude (1)
72- 76 F5.2 mag Bmag ?=99.99 The RBC B band magnitude (1)
79- 83 F5.2 mag Vmag ?=99.99 The RBC V band magnitude (1)
86- 90 F5.2 mag Rmag ?=99.99 The RBC R band magnitude (1)
93- 97 F5.2 mag Imag ?=99.99 The RBC I band magnitude (1)
100-104 F5.2 mag Jmag ?=99.99 The RBC J band magnitude (1)
107-111 F5.2 mag Hmag ?=99.99 The RBC H band magnitude (1)
114-118 F5.2 mag Kmag ?=99.99 The RBC K band magnitude (1)
121-125 F5.2 mag umag ?=99.99 The SDSS u band AB magnitude (1)
128-132 F5.2 mag gmag ?=99.99 The SDSS g band AB magnitude (1)
135-139 F5.2 mag rmag ?=99.99 The SDSS r band AB magnitude (1)
142-146 F5.2 mag imag ?=99.99 The SDSS i band AB magnitude (1)
149-153 F5.2 mag zmag ?=99.99 The SDSS z band AB magnitude (1)
156-160 F5.2 mag Ksmag ?=99.99 The Ks band magnitude (Vega mag) (1)
164-167 F4.2 mag E(B-V) Reddening value
171-174 F4.2 mag e_E(B-V) Uncertainty in E(B-V)
177-181 F5.2 --- [Fe/H] ?=99.99 The [Fe/H] value
183-187 F5.2 --- [Fe/H]2 ?=99.99 Additional [Fe/H] value (2)
191-195 F5.2 --- e_[Fe/H] ?=99.99 Uncertainty in [Fe/H]
197-203 F7.1 km/s RV ?=99999.9 Radial velocity
205-210 F6.1 km/s e_RV ?=9999.9 Uncertainty in RV
213-214 I2 --- RBC ?=-9 Classification flag of RBC v4 (3)
217-218 I2 --- P10 ?=-9 Classification flag of P10 (4)
221-222 I2 --- C09 ?=-9 Classification flag of Caldwell (5)
226 I1 --- f_E(B-V) [1/3] Flag on E(B-V) (6)
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Note (1): Optical U, B, V, R, I and NIR J, H, K bands are from the RBC v4
(Galleti et al., 2004, Cat. J/A+A/416/917). Optical u, g, r, i, z and
NIR K bands are from Peacock et al. (2010, Cat. J/MNRAS/402/803).
Note (2): Additional [Fe/H] values from either Beasley et al.
(2004AJ....128.1623B 2004AJ....128.1623B) or Perina et al. (2010A&A...511A..23P 2010A&A...511A..23P), or the
mean of these values (for B222, B321, and B327).
Note (3): Classification of RBC v4 (Cat. J/A+A/416/917) as follows:
1 = cluster;
2 = candidate cluster;
3 = controversial object;
4 = galaxy;
5 = HII region;
6 = star;
7 = asterism;
8 = extended cluster;
Note (4): Classification of Peacock et al. 2010, Cat. J/MNRAS/402/803, as
follows:
1 = old cluster;
2 = candidate cluster;
3 = young cluster;
4 = galaxy;
5 = HII region;
6 = star;
Note (5): Classification of Caldwell et al. (2009, Cat. J/AJ/137/94,
2011AJ....141...61C 2011AJ....141...61C) as follows:
1 = young cluster (age<1Gyr);
2 = intermediate cluster (1<age<2Gyr);
3 = old cluster (age>2Gyr);
4 = cluster (no age);
5 = star;
6 = maybe star;
7 = HII region;
8 = unknown;
9 = candidate cluster;
10 = weird (SNR, Eta Carina type, or symbiotic star);
11 = ?
15 = galaxy
Note (6): Flag as follows:
1 = mean value of reddening from available literature;
2 = median reddening value of star clusters located within an annulus
at every 2kpc radius from the center of M31;
3 = foreground reddening value of E(B-V)=0.13;
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of star cluster
12 I1 h RAh [0] Hour of Right Ascension (J2000)
14- 15 I2 min RAm [38/47] Minute of Right Ascension (J2000)
17- 21 F5.2 s RAs Second of Right Ascension (J2000)
23 A1 --- DE- [+] Sign of Declination (J2000)
24- 25 I2 deg DEd [40/42] Degree of Declination (J2000)
27- 28 I2 arcmin DEm Arcminute of Declination (J2000)
30- 33 F4.1 arcsec DEs Arcsecond of Declination (J2000)
35- 38 I4 Myr Age Age of young cluster
40- 43 F4.2 [Msun] logM Log mass of young cluster
45- 49 F5.2 mag E(B-V) ?=99.99 Reddening
51 I1 --- f_E(B-V) ?=9 Flag on E(B-V) (1)
53- 59 F7.4 --- Z ?=99.9999 Metallicity adopted in SED fitting
61 I1 --- f_Name [1/3] Flag on Name (2)
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Note (1): Flag of E(B-V) as follows:
1 = reddening value from our compiled catalog (indivEBV);
2 = reddening value from our SED fitting (freeEBV).
Note (2): Young clusters flag as follows:
1 = young clusters in both this work and Caldwell et al. (2009,
Cat. J/AJ/137/94);
2 = only in this work,
3 = only in Caldwell et al. (2009, Cat. J/AJ/137/94).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 30-Jul-2012