J/AcA/58/23 Photometric survey for M33 stellar clusters (Zloczewski+, 2008)
Photometric survey for stellar clusters in the outer part of M33.
Zloczewski K., Kaluzny J., Hartman J.
<Acta Astron., 58, 23-39 (2008)>
=2008AcA....58...23Z 2008AcA....58...23Z
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Photometry, SDSS
Keywords: catalogs - galaxies: individual: M33 - galaxies: star clusters
Abstract:
We present a catalog of 4780 extended sources from the outer field
of M33. The catalog includes 73 previously identified clusters or
planetary nebulae, 1153 likely background galaxies, and 3554 new
candidate stellar clusters. The survey is based on deep ground-based
images obtained with the MegaCam instrument on the CFHT telescope. We
provide g'r'i' photometry for detected objects as well as
estimates of the FWHM and ellipticity of their profiles. The sample
includes 122 new, relatively bright, likely globular clusters.
Follow-up observations of fainter candidates from our list may extend
the faint-end of the observed luminosity function of globular clusters
in M33 by up to 3 magnitudes. The catalog includes several cluster
candidates located in the outskirts of the galaxy. These objects are
promising targets for deep photometry with the HST. We present a
color-magnitude diagram for one detected object, showing that it is
an extended and low-surface-brightness old cluster located at an
angular distance of 27' from the center of M33.
Description:
The imaging data used in this work were obtained using the Queue
Service Observing mode at the Canada France Hawaii Telescope (CFHT)
3.6m telescope within the program "M33 CFHT Variability Survey"
(Hartman et al. 2006, Cat. J/MNRAS/371/1405). They were collected
on 16 separate nights between August 2003, and November 2004.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 137 4780 The catalog of extended objects in the outer part
of M33 galaxy (version 2008.04.17)
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See also:
J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- ID Identification number, NN-N-NNN (1)
10- 17 F8.5 deg RAdeg Right ascension in decimal degrees (J2000.0)
19- 27 F9.5 deg DEdeg Declination in decimal degrees (J2000.0)
29- 34 F6.3 mag g'mag ?=99.999 g' magnitude in 1 FWHM aperture (4)
36- 40 F5.3 mag e_g'mag ?=9.999 rms uncertainty on g'mag
42- 47 F6.3 mag r'mag ?=99.999 r' magnitude in 1 FWHM aperture (4)
49- 53 F5.3 mag e_r'mag ?=9.999 rms uncertainty on r'mag
55- 60 F6.3 mag i'mag ?=99.999 i' magnitude in 1 FWHM aperture (4)
62- 66 F5.3 mag e_i'mag ?=9.999 rms uncertainty on i'mag
68- 73 F6.3 mag g'mag2 ?=99.999 g' magnitude in 2 FWHM aperture (4)
75- 79 F5.3 mag e_g'mag2 ?=9.999 rms uncertainty on g'mag2
81- 86 F6.3 mag r'mag2 ?=99.999 r' magnitude in 2 FWHM aperture (4)
88- 92 F5.3 mag e_r'mag2 ?=9.999 rms uncertainty on r'mag2
94- 99 F6.3 mag i'mag2 ?=99.999 i' magnitude in 2 FWHM aperture (4)
101-105 F5.3 mag e_i'mag2 ?=9.999 rms uncertainty on i'mag2
107-111 F5.2 arcsec FWHM ?=-1.00 SExtractor FWHM (in g' band)
113-118 F6.3 --- ell ?=-1.000 SExtractor ellipticity (in g' band)
120-121 I2 --- f_g'mag ?=-1 SExtractor flags for g' filter (2)
123-124 I2 --- f_r'mag ?=-1 SExtractor flags for r' filter (2)
126-127 I2 --- f_i'mag ?=-1 SExtractor flags for i' filter (2)
129-133 F5.2 arcsec FWHM2 ?=-1.00 FWHM returned by IRAF/imexam task
135-136 I2 --- Cl [-1/2] Classification type (3)
137 A1 --- n_Cl [*] * for objects checked on HST/ACS images
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Note (1): Name defined as theMegaCam field number (Hartman et al., 2006,
Cat. J/MNRAS/371/1405), the number of our subfield and the number
of the object on a given subfield.
Note (2): SExtractor flags as follows:
0 = no comment
2 = was originally blended with another one
4 = at least one pixel is saturated
6 = 2 and 4
16 = aperture data are incomplete or corrupted
18 = 16 and 2
22 = 16 and 2 and 4
99 = SExtractor has not detected the object
Note (3): Classification type (based on visual inspection) as follows:
-1 = galaxy (1155 objects)
0 = unclassified (3462 objects)
1 = likely cluster (122 objects)
2 = known high confidence cluster (41 objects)
Note (4): as returned by DAOPHOT.
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History:
Copied at http://case.camk.edu.pl/results/M33/m33_20080417.public
(End) Patricia Vannier [CDS] 11-May-2009