J/ApJ/699/839 Newly identified star clusters in M33. II. (San Roman+, 2009)
Newly identified star clusters in M33.
II. Radial Hubble space Telescope/Advanced camera for surveys fields.
San Roman I., Sarajedini A., Garnett D.R., Holtzman J.A.
<Astrophys. J., 699, 839-849 (2009)>
=2009ApJ...699..839S 2009ApJ...699..839S
ADC_Keywords: Associations, stellar ; Galaxies, nearby ; Photometry, HST ;
Cross identifications
Keywords: galaxies: individual (M33) - galaxies: spiral - galaxies: star
clusters - galaxies: stellar content
Abstract:
We present integrated photometry and color-magnitude diagrams (CMDs)
for 161 star clusters in M33, of which 115 were previously
uncataloged, using the Advanced Camera For Surveys Wide Field Channel
onboard the Hubble Space Telescope. The integrated V-band magnitudes
of these clusters range from MV~-9 to as faint as MV~-4, extending
the depth of the existing M33 cluster catalogs by ∼1mag. Comparisons
of theoretical isochrones to the CMDs using the Padova models yield
ages for 148 of these star clusters. The ages range from log(t)∼7.0 to
log(t)∼9.0. Our CMDs are not sensitive to clusters older than ∼1Gyr.
We find that the variation of the clusters' integrated colors and
absolute magnitudes with age is consistent with the predictions of
simple stellar population models. These same models suggest that the
masses of the clusters in our sample range from 5x103 to
5x104M☉.
Description:
The observations for the present study were obtained with the Advanced
Camera for Surveys Wide Field Channel (ACS/WFC) on board the HST.
Twelve HST/ACS fields from the GO-10190 program (P.I.: D. Garnett)
have been analyzed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 86 161 Cluster properties and cross identification with
Zloczewski et al. 2008, Cat. J/AcA/58/23 from table 3
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/AcA/59/47 : HST photometry of M33 stellar clusters (Zloczewski+, 2009)
J/AcA/58/23 : Photometric survey for M33 stellar 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/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: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/161] Running cluster identification number
(<[SSG2009] NNN> in Simbad)
5 I1 h RAh Hour of Right Ascension (J2000)
7- 8 I2 min RAm Minute of Right Ascension (J2000)
10- 14 F5.2 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- Sign of declination (J2000)
17- 18 I2 deg DEd Degree of Declination (J2000)
20- 21 I2 arcmin DEm Arcminute of Declination (J2000)
23- 27 F5.2 arcsec DEs Arcsecond of Declination (J2000)
29- 34 F6.3 mag Vmag ? HST/ACS F606W band magnitude
36- 41 F6.3 mag V-I ? The (V-I) color index (F606W-F814W)
43- 48 F6.3 mag B-V ? The (B-V) color index (F475W-F606W-F814W)
50- 53 F4.2 mag E(V-I) ? The (V-I) color excess
55- 58 F4.2 [yr] logA ? Log of the cluster age
60 A1 --- f_logA [e] e: error in log age of ±0.1
62- 65 F4.1 10+3Msun Mass ? Cluster mass
67- 71 A5 --- Notes Cluster note ("Small" or "Edge")
73- 75 I3 --- [SM2007] ? Sarajedini & Mancone 2007,
Cat. J/AJ/134/447, identification number
77- 84 A8 --- [ZKH2008] loczewski et al. 2008, Cat. J/AcA/58/23
identification (from table 3 of the paper)
86 I1 --- OType ? Proposed classification in [ZKH2008] (1)
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Note (1): Type as follows:
-1 = galaxy,
0 = unclassified,
1 = likely stellar cluster
2 = an already known high-confidence cluster included in Sarajedini &
Mancone (2007, Cat. J/AJ/134/447).
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History:
From electronic version of the journal
References:
Sarajedini et al. Paper I. 2007AJ....133..290S 2007AJ....133..290S
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jul-2011