J/A+A/525/A19 Photometry of globulars in early galaxies (Chies-Santos+, 2011)
An optical/NIR survey of globular clusters in early-type galaxies.
I. Introduction and data reduction procedures.
Chies-Santos A.L., Larsen S.S., Wehner E.M., Kuntschner H., Strader J.,
Brodie J.P.
<Astron. Astrophys. 525, A19 (2011)>
=2011A&A...525A..19C 2011A&A...525A..19C
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry
Keywords: Galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: star clusters
Abstract:
The combination of optical and near-infrared (NIR) colours has the
potential to break the age/metallicity degeneracy and offers a better
metallicity sensitivity than optical colours alone. Previous studies
of extragalactic globular clusters (GCs) with this colour combination,
however, have suffered from small samples or have been restricted to a
few galaxies.
We compile a homogeneous and representative sample of GC systems with
multi-band photometry to be used in subsequent papers where ages and
metallicity distributions will be studied.
Description:
We acquired deep K-band images of 14 bright nearby early-type
galaxies. The images were obtained with the LIRIS near-infrared
spectrograph and imager at the William Herschel Telescope (WHT) and
combined with optical ACS g and z images from the Hubble Space
Telescope public archive.
Table 4 contains ACS and LIRIS photometry and sizes for the GC systems
of NGC3377, NGC4278, NGC4365, NGC4374, NGC4382, NGC4406, NGC4473,
NGC4486, NGC4526, NGC4552, NGC4570, NGC4621, NGC4649, NGC4660.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 74 1301 Positions, photometry and sizes
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC Galaxy NGC number
6- 9 I4 --- GC [1/301] Globular cluster number within the
galaxy (starts from 1 for each galaxy)
11- 19 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
21- 28 F8.5 deg DEdeg Declination in decimal degrees (J2000)
30- 35 F6.3 mag gmag HST/ACS F475W (g) magnitude
37- 41 F5.3 mag e_gmag rms uncertainty on gmag
43- 48 F6.3 mag zmag HST/ACS F850LP (z) magnitude
50- 54 F5.3 mag e_zmag rms uncertainty on zmag
56- 61 F6.3 mag Kmag WHT (William Herschel Telescope) Ks magnitude
(with LIRIS near-IR spedctrograph and imager)
63- 67 F5.3 mag e_Kmag rms uncertainty on Kmag
69- 74 F6.3 pc Reff Effective radius
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Acknowledgements:
Ana Chies Santos, A.L.Chies(at)uu.nl
(End) Patricia Vannier [CDS] 05-Oct-2010