J/AJ/131/414 Structural parameters of SMC star clusters (Hill+, 2006)
The star clusters of the Small Magellanic Cloud: structural parameters.
Hill A., Zaritsky D.
<Astron. J., 131, 414-430 (2006)>
=2006AJ....131..414H 2006AJ....131..414H (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Morphology
Keywords: galaxies: individual (Small Magellanic Cloud) -
galaxies: star clusters - globular clusters: general -
Magellanic Clouds
Abstract:
We present structural parameters for 204 stellar clusters in the Small
Magellanic Cloud derived from fitting King and Elson, Fall, and
Freeman (EFF, 1987ApJ...323...54E 1987ApJ...323...54E) model profiles to the V-band
surface brightness profiles as measured from the Magellanic Clouds
Photometric Survey images.
Description:
The data come from the Magellanic Clouds Photometric Survey (MCPS)
described by Zaritsky et al. (2002, Cat. J/AJ/123/855). In summary,
we have obtained U, B, V, and I drift-scan images of the central
4.5°x4° area of the SMC using the Las Campanas Swope (1m)
telescope and the Great Circle Camera.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 204 Cluster designation and position
table2.dat 142 204 Structural parameters
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See also:
J/AJ/119/1214 : Census of star clusters in the SMC (Bica+, 2000)
J/AJ/123/855 : Magellanic Clouds Photometric Survey: the SMC (Zaritsky+ 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [RZ2005] Cluster Number
9 I1 h RAh Hour of Right Ascension (J2000)
11- 12 I2 min RAm Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
22 A1 --- DE- Sign of the Declination (J2000)
23- 24 I2 deg DEd Degree of Declination (J2000)
26- 27 I2 arcmin DEm Arcminute of Declination (J2000)
29- 33 F5.2 arcsec DEs Arcsecond of Declination (J2000)
37- 62 A26 ---- OName Other Cluster Names
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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- 3 I3 --- [RZ2005] Cluster Number
8- 11 F4.2 pc e_CRad Lower 1σ confidence interval
on CRad (1)
15- 19 F5.2 pc CRad Best fit King core radius
23- 27 F5.2 pc E_CRad Upper 1σ confidence interval
on CRad (1)
31- 35 F5.2 pc e_LRad Lower 1σ confidence interval
on LRad (1)
39- 43 F5.2 pc LRad Best fit 90% light radius
47- 51 F5.2 pc E_LRad Upper 1σ confidence interval
on LRAd (1)
55- 58 F4.1 mag Vmag King model V-band magnitude (2)
62- 66 I5 ct/arcsec2 Sig King model central count density (2)
70- 73 F4.2 --- Ellip Ellipticity (1-b/a)
78- 81 F4.2 --- chi2 King model Χ2 (2)
85- 89 F5.2 pc e_ERad Lower 1σ confidence interval
on ERad (1)
93- 97 F5.2 pc ERad Best fit EFF core radius (4) (3)
101-105 F5.2 pc E_ERad Upper 1σ confidence interval
on ERad (1)
109-112 F4.2 --- e_Egam Lower 1σ confidence interval
on Egam (1)
116-119 F4.2 --- Egam Best fit γ value
123-126 F4.2 --- E_Egam Upper 1σ confidence interval
on Egam (1)
130-134 I5 ct/arcsec2 ESig EFF model central count density (4)
138-142 F5.2 --- Echi2 EFF model Χ2 (4)
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Note (1): Defined using χ2, and are therefore undefined in the cases
where even the best fit model has χ2 greater than the
corresponding value for the available degrees of freedom.
Note (2): King (1962AJ.....67..471K 1962AJ.....67..471K).
Note (3): The core radius, when defined as the radius for which the surface
brightness drops to half its central value, can be calculated using
rc=a(22/γ-1)0.5.
Note (4): Elson, Fall & Freeman (1987ApJ...323...54E 1987ApJ...323...54E).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 31-Aug-2006