J/ApJ/720/1674 CFHT M33 extended sources catalog (San Roman+, 2010)
Photometric properties of the M33 star cluster system.
San Roman I., Sarajedini A., Aparicio A.
<Astrophys. J., 720, 1674-1683 (2010)>
=2010ApJ...720.1674S 2010ApJ...720.1674S
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, ugriz ;
Cross identifications
Keywords: galaxies: individual (M33) - galaxies: spiral -
galaxies: star clusters: general - galaxies: stellar content
Abstract:
We present a catalog of 2990 extended sources in a 1x1° area
centered on M33 using the MegaCam camera on the 3.6m
Canada-France-Hawaii Telescope. The catalog includes 599 new candidate
stellar clusters, 204 previously confirmed clusters, 1969 likely
background galaxies, and 218 unknown extended objects. We present
ugriz integrated magnitudes of the candidates and confirmed star
clusters (SCs) as well as the full width at half maximum, ellipticity,
and stellarity. Based on the properties of the confirmed SCs, we
select a sub-sample of highly probable clusters composed of 246
objects. The integrated photometry of the complete cluster catalog
reveals a wide range of colors of -0.4<(g-r)<1.5 and -1.0<(r-i)<1.0
with no obvious cluster subpopulations. Comparisons with models of
simple stellar populations suggest a large range of ages some as old
as ∼10Gyr.
Description:
The observations were obtained using the Queue Service Observing mode
at the 3.6m CFHT. The data are available online through The Canadian
Astronomy Data Centre archive and were obtained as part of "The M33
CFHT Variability Survey" (Hartman et al. 2006, Cat. J/MNRAS/371/1405).
MegaCam operates with a set of g'r'i'z' filters very similar to those
of the Sloan Digital Sky Survey (SDSS) but a slightly different
near-UV filter called u*.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 243 2990 Extended source catalog
table2.dat 46 10 Cross-identification with Grossi et al.
(2010A&A...521A..41G 2010A&A...521A..41G)
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See also:
J/ApJ/699/839 : Newly identified star clusters in M33. II. (San Roman+, 2009)
J/ApJ/700/103 : Ages of star clusters in M33 (Park+, 2009)
J/AcA/59/47 : HST photometry of M33 stellar clusters (Zloczewski+, 2009)
J/AcA/58/23 : Photometric survey for M33 star clusters (Zloczewski+, 2008)
J/AJ/134/447 : Catalog of star cluster candidates in M 33 (Sarajedini+, 2007)
J/AJ/134/2168 : BVI photometry of M33 star clusters (Park+, 2007)
J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006)
J/A+A/444/831 : New star clusters in M33 (Bedin+, 2005)
J/A+A/366/498 : VI photometry of M33 star clusters (Chandar+, 2001)
J/ApJS/122/431 : Star Clusters in M33 (Chandar+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Index identification number
6 I1 h RAh [1] Hour of Right Ascension (J2000)
8- 9 I2 min RAm [31/36] Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- [+] Sign of Declination (J2000)
18- 19 I2 deg DEd [30/31] Degree of Declination (J2000)
21- 22 I2 arcmin DEm [0/59] Arcminute of Declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000)
30- 36 F7.4 mag gmag ? g band magnitude in the SDSS system (1)
38- 44 F7.4 mag u-g ? (u-g) color index (SDSS system) (1)
46- 52 F7.4 mag g-r ? (g-r) color index (SDSS system) (1)
54- 60 F7.4 mag g-i ? (g-i) color index (SDSS system) (1)
62- 68 F7.4 mag g-z ? (g-z) color index (SDSS system) (1)
70- 76 F7.4 mag u2.2mag ? CFHT u* filter magnitude; aperture=2.2"
78- 83 F6.4 mag e_u2.2mag ? Uncertainty in u2.2mag
85- 91 F7.4 mag g2.2mag ? CFHT g' filter magnitude; aperture=2.2"
93- 98 F6.4 mag e_g2.2mag ? Uncertainty in g2.2mag
100-106 F7.4 mag r2.2mag ? CFHT r' filter magnitude; aperture=2.2"
108-113 F6.4 mag e_r2.2mag ? Uncertainty in r2.2mag
115-121 F7.4 mag i2.2mag ? CFHT i' filter magnitude; aperture=2.2"
123-128 F6.4 mag e_i2.2mag ? Uncertainty in i2.2mag
130-136 F7.4 mag z2.2mag ? CFHT z' filter magnitude; aperture=2.2"
138-143 F6.4 mag e_z2.2mag ? Uncertainty in z2.2mag
145-151 F7.4 mag u1.5mag ? CFHT u* filter magnitude; aperture=1.5"
153-158 F6.4 mag e_u1.5mag ? Uncertainty in u1.5mag
160-166 F7.4 mag g1.5mag ? CFHT u' filter magnitude; aperture=1.5"
168-173 F6.4 mag e_g1.5mag ? Uncertainty in g1.5mag
175-181 F7.4 mag r1.5mag ? CFHT r' filter magnitude; aperture=1.5"
183-188 F6.4 mag e_r1.5mag ? Uncertainty in r1.5mag
190-196 F7.4 mag i1.5mag ? CFHT i' filter magnitude; aperture=1.5"
198-203 F6.4 mag e_i1.5mag ? Uncertainty in i1.5mag
205-211 F7.4 mag z1.5mag ? CFHT z' filter magnitude; aperture=1.5"
213-218 F6.4 mag e_z1.5mag ? Uncertainty in z1.5mag
220-224 F5.3 --- Ell [0/1] Source ellipticity
226-231 F6.3 arcsec FWHM SExtractor Full-Width at Half-Maximum
233-236 F4.2 --- S [0,1] SExtractor stellarity (0: Gal; 1: Star)
238-240 I3 --- AID [6/599]? Alternative identification (2)
242-243 I2 --- Class [-1/3] Proposed classification (G1)
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Note (1): CFHT/MegaCam g'r'i'z'u* filters transformed into the SDSS ugriz
filters following the equations in Tucker et al. 2006AN....327..821T 2006AN....327..821T.
See section 4.1.
Note (2): Identification from Sarajedini & Mancone (2007, Cat. J/AJ/134/447;
<[SM2007] NNN> in Simbad).
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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- 4 I4 --- Seq [735/1742] Identification number
6- 14 A9 --- OID Cross-identification (1)
16- 19 F4.2 [yr] logAge [6.35/7.16] Age (1)
21- 24 F4.2 [yr] e_logAge logAge uncertainty (1)
26- 29 F4.2 mag Av [0.4/0.93] Visual extinction AV (1)
31- 34 F4.2 mag e_Av Av uncertainty (1)
36- 39 F4.2 mag E(B-V) [0.16/0.41] Reddening (1)
41- 44 F4.2 mag e_E(B-V) E(B-V) uncertainty (1)
46 I1 --- Class [1/3] Classification (G1)
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Note (1): From Grossi et al. 2010A&A...521A..41G 2010A&A...521A..41G
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Global notes:
Note (G1): Proposed classification as follows:
-1 = galaxy;
0 = unknown extended object;
1 = candidate star cluster;
2 = highly probable star cluster;
3 = confirmed star cluster (based on Sarajedini & Mancone 2007,
Cat. J/AJ/134/447).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Jul-2012