J/AJ/132/447 Surface Brightness of 38 Gal. Globular Clusters (Noyola+, 2006)
Surface Brightness Profiles of Galactic Globular Clusters from
Hubble Space Telescope Images.
Noyola E., Gebhardt K.
<Astron. J. 132, 447 (2006)>
=2006AJ....132..447N 2006AJ....132..447N
ADC_Keywords: Clusters, globular ; Photometry, surface
Keywords: globular clusters: general - stellar dynamics
Abstract:
The Hubble Space Telescope (HST) allows us to study the central
surface brightness profiles of globular clusters at unprecedented
detail. We have mined the HST archives to obtain 38 WFPC2 images of
Galactic globular clusters with adequate exposure times and filters,
which we use to measure their central structure.
Description:
Files contain surface brightness and luminosity density profiles for
38 Galactic globular clusters. The profiles are given in the form of
individual photometric measurements and the corresponding smooth
versions. The profiles are obtained by measuring integrated light from
WFPC2 images and are all presented in V-band.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 38 Clusters studied
photdata.dat 26 916 Individual photometric points
smdata.dat 37 3800 Smooth surface brightness and luminosity density
profiles
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See also:
VII/103 : Galactic Globular Clusters (Monella 1985)
VII/151 : Galactic Globular Clusters Structure Parameters (Webbink 1985)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)
J/A+A/391/945 : HST photometry of 74 galactic globular clusters (Piotto+, 2002)
J/A+A/450/105 : Properties of 153 Galactic globular clusters (Bica+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC Cluster NGC number
6- 11 A6 --- OName Other name of cluster
14- 18 A5 --- Filter HST filter used
22- 25 I4 s t.exp Exposure time
30- 38 A9 --- Image HST image used (see HST log, Cat. B/hst)
43- 44 I2 h RAh Cluster center J2000 right ascension (hours)
46- 47 I2 min RAm Cluster center J2000 right ascension (minutes)
49- 53 F5.2 s RAs Cluster center J2000 right ascension (seconds)
56 A1 --- DE- Cluster center J2000 declination sign
57- 58 I2 deg DEd Cluster center J2000 declination (degrees)
60- 61 I2 arcmin DEm Cluster center J2000 declination (arc minutes)
63- 67 F5.2 arcsec DEs Cluster center J2000 declination (arc seconds)
68 A1 --- Rem [*] if position is from Harris catalog
(1996, Cat. VII/202)
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Byte-by-byte Description of file: photdata.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
5- 8 I4 --- NGC Cluster NGC number
10- 14 F5.2 [arcsec] logr Logarithmic radius
16- 20 F5.2 mag/arcsec2 SuBr Surface brightness in V band
22- 26 F5.3 mag/arcsec2 e_SuBr Photometric error
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Byte-by-byte Description of file: smdata.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- NGC
5- 8 I4 --- NGC Cluster NGC number
10- 14 F5.2 [arcsec] logr Logarithmic radius
16- 20 F5.2 mag/arcsec+2 SuBr Surface brightness in V band
22- 37 F16.7 solMass/pc+3 Dens ?=- Density
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Acknowledgements:
Eva Noyola, eva(at)astro.as.utexas.edu
(End) Patricia Vannier [CDS] 02-May-2006