J/AJ/142/48 LMC star clusters structural parameters (Werchan+, 2011)
The star clusters of the Large Magellanic Cloud: structural parameters.
Werchan F., Zaritsky D.
<Astron. J., 142, 48 (2011)>
=2011AJ....142...48W 2011AJ....142...48W
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Morphology
Keywords: galaxies: star clusters: general - globular clusters: general -
Magellanic Clouds
Abstract:
We present and analyze the radial luminosity profiles of a sample of
1066 stellar clusters in the Large Magellanic Cloud (LMC). By design,
this study closely follows the compilation by Hill & Zaritsky (2006,
Cat. J/AJ/131/414 of the structural parameters of stellar clusters in
the Small Magellanic Cloud (SMC). Both King and Elson-Fall-Freeman
model profiles are fit to V-band surface brightness profiles measured
from the Magellanic Cloud Photometric Survey images. We tabulate the
concentration, central surface brightness, tidal radii, 90% enclosed
luminosity radii (r90), and local background luminosity density. Over
two-thirds of the clusters in the sample are adequately fit by one or
both of these models. One notable and systematic exception, as in the
SMC, is those clusters that lack a central brightness concentration,
the "ring" clusters. While the bulk properties of the clusters are
similar between the LMC and SMC populations, we find that the LMC
lacks clusters that are as large, either in terms of core radii or
r90, as the largest in the SMC, perhaps a signature of larger tidal
stresses in the LMC.
Description:
The original U, B, V, and I band images, from which the photometric
stellar catalog was constructed, come from drift scans obtained with
the Great Circle Camera mounted on the Swope 1m telescope at the Las
Campanas Observatory in Chile for the Magellanic Clouds Photometric
Survey (Zaritsky et al., 1997AJ....114.1002Z 1997AJ....114.1002Z).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 61 1066 Cluster designation and position
table2.dat 65 1066 Structural parameters for King model fits
table3.dat 53 1066 Structural parameters for Elson-Fall-Freeman (EFF)
model fits
--------------------------------------------------------------------------------
See also:
J/MNRAS/272/391 : Globular clusters in the Magellanic Clouds (Ferraro+, 1995)
J/ApJS/155/401 : SMC/LMC globular clusters ISOCAM obs. (Tanabe+, 2004)
J/MNRAS/369/697 : SMC/LMC globular clusters VRI photometry (Goudfrooij+, 2006)
J/AJ/131/414 : Structural parameters of SMC star clusters (Hill+, 2006)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Cluster sequential number
6 I1 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of the Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000)
30- 61 A32 --- AName Alternative cluster designation
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Cluster sequential number
6- 10 F5.2 pc b_Rc.K Lower boundary limit on Rc.K
12- 16 F5.2 pc Rc.K King best core radius fit
18- 22 F5.2 pc B_Rc.K Upper boundary limit on Rc.K
24- 28 F5.2 pc b_R90.K Lower boundary limit on R90.K
30- 34 F5.2 pc R90.K King best 90% light radius
36- 40 F5.2 pc B_R90.K Upper boundary limit on R90.K
42- 45 F4.1 mag Vmag.K King V band magnitude of model
47- 53 F7.1 ct/arcsec2 CCB.K King central surface brightness
55- 58 F4.2 --- chi2.K King model χ2
60- 65 F6.2 --- bg.K King background value for cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq Cluster sequential number
6- 9 F4.2 pc b_Rc.E Lower boundary limit on Rc.E
11- 15 F5.2 pc Rc.E EEF (Elson-Fall-Freeman) best core radius fit
17- 21 F5.2 pc B_Rc.E Upper boundary limit on Rc.E
23- 27 F5.2 pc b_R90.E Lower boundary limit on R90.E
29- 33 F5.2 pc R90.E EEF best 90% light radius
35- 39 F5.2 pc B_R90.E Upper boundary limit on R90.E
41- 47 F7.1 ct/arcsec2 CCB.E EEF central surface brightness
49- 53 F5.2 --- chi2.E EFF model χ2
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 27-Sep-2012