J/ApJS/227/12 NGVS XXV. Virgo globular clusters photometry (Powalka+, 2016)
The Next Generation Virgo cluster Survey (NGVS).
XXV. Fiducial panchromatic colors of Virgo core globular clusters and their
comparison to model predictions.
Powalka M., Lancon A., Puzia T.H., Peng E.W., Liu C., Munoz R.P.,
Blakeslee J.P., Cote P., Ferrarese L., Roediger J., Sanchez-Janssen R.,
Zhang H., Durrell P.R., Cuillandre J.-C., Duc P.-A., Guhathakurta P.,
Gwyn S.D.J., Hudelot P., Mei S., Toloba E.
<Astrophys. J. Suppl. Ser. 227, 12 (2016)>
=2016ApJS..227...12P 2016ApJS..227...12P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Clusters, globular ; Colors ;
Photometry, ugriz ; Photometry, K-line
Keywords: galaxies: clusters: individual (Virgo) - galaxies: photometry -
galaxies: star clusters: general
Abstract:
The central region of the Virgo cluster of galaxies contains thousands
of globular clusters (GCs), an order of magnitude more than the
numbers found in the Local Group. Relics of early star formation
epochs in the universe, these GCs also provide ideal targets to test
our understanding of the Spectral Energy Distributions (SEDs) of old
stellar populations. Based on photometric data from the Next
Generation Virgo cluster Survey (NGVS) and its near-infrared
counterpart NGVS-IR, we select a robust sample of ∼2000 GCs with
excellent photometry and spanning the full range of colors present in
the Virgo core. The selection exploits the well defined locus of GCs
in the uiK diagram and the fact that the globular clusters are
marginally resolved in the images. We show that the GCs define a
narrow sequence in 5-dimensional color space, with limited but real
dispersion around the mean sequence. The comparison of these SEDs with
the predictions of eleven widely used population synthesis models
highlights differences between models, and also shows that no single
model adequately matches the data in all colors. We discuss possible
causes for some of these discrepancies. Forthcoming papers of this
series will examine how best to estimate photometric metallicities in
this context, and compare the Virgo globular cluster colors with those
in other environments.
Description:
Colors and magnitudes for 1846 candidate globular clusters located in
the central region around M87. All the fluxes are obtained with the
MegaCam/WirCam instruments on the CFHT (Canada France Hawaii
Telescope). Therefore, the magnitudes are given in the MegaCam/WirCam
u*, g, r, i, z, and Ks set of filters, in the AB system. Two versions
of the magnitudes are provided, based on two calibration procedures.
We favor the use of the colors calibrated using the SDSS, UKIDSS
stars: (color)_cal.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 190 1846 Photometry for 1846 Virgo core globular clusters
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See also:
J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004)
J/ApJ/802/30 : NGVS VI. Ultra-compact dwarfs in M87 (Zhang+, 2015)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000.0)
12- 20 F9.6 deg DEdeg Declination (J2000.0)
22- 26 F5.4 mag E(B-V) Extinction (1)
28- 33 F6.3 mag u*magap8 MegaCam/WirCam u* AB magnitude; aperture
corrected magnitude based on 8pix aperture
35- 40 F6.3 mag gmagap8 MegaCam/WirCam g AB magnitude; aperture
corrected magnitude based on 8pix aperture
42- 47 F6.3 mag rmagap8 MegaCam/WirCam r AB magnitude; aperture
corrected magnitude based on 8pix aperture
49- 54 F6.3 mag imagap8 MegaCam/WirCam i AB magnitude; aperture
corrected magnitude based on 8pix aperture
56- 61 F6.3 mag zmagap8 MegaCam/WirCam z AB magnitude; aperture
corrected magnitude based on 8pix aperture
63- 68 F6.3 mag Ksmagap8 MegaCam/WirCam Ks AB magnitude; aperture
corrected magnitude based on 8pix aperture
70- 75 F6.3 mag u*0magap8 Dereddened u* magnitude; aperture corrected
magnitude based on 8pix aperture
77- 82 F6.3 mag g0magap8 Dereddened g magnitude; aperture corrected
magnitude based on 8pix aperture
84- 89 F6.3 mag r0magap8 Dereddened r magnitude; aperture corrected
magnitude based on 8pix aperture
91- 96 F6.3 mag i0magap8 Dereddened i magnitude; aperture corrected
magnitude based on 8pix aperture
98-103 F6.3 mag z0magap8 Dereddened z magnitude; aperture corrected
magnitude based on 8pix aperture
105-110 F6.3 mag Ks0magap8 Dereddened Ks magnitude; aperture corrected
magnitude based on 8pix aperture
112-115 F4.3 mag e_u*magap8 1-sigma error on u*magap8 (2)
117-120 F4.3 mag e_gmagap8 1-sigma error on gmagap8 (2)
122-125 F4.3 mag e_rmagap8 1-sigma error on rmagap8 (2)
127-130 F4.3 mag e_imagap8 1-sigma error on imagap8 (2)
132-135 F4.3 mag e_zmagap8 1-sigma error on zmagap8 (2)
137-140 F4.3 mag e_Ksmagap8 1-sigma error on Ksmagap8 (2)
142-146 F5.3 mag (u*-g)cal u*-g color, dereddened
148-151 F4.3 mag (g-r)cal g-r color, dereddened
153-156 F4.3 mag (r-i)cal r-i color, dereddened
158-162 F5.3 mag (i-z)cal i-z color, dereddened
164-168 F5.3 mag (i-Ks)cal i-Ks color, dereddened
170-173 F4.3 mag (g-r)cal.slr Dereddened g-r color index ;
after re-calibration with SLR
175-178 F4.3 mag (r-i)cal.slr Dereddened r-i color index ;
after re-calibration with SLR
180-184 F5.3 mag (i-z)cal.slr Dereddened i-z color index ;
after re-calibration with SLR
186-190 F5.3 mag (i-Ks)cal.slr Dereddened i-Ks color index ;
after re-calibration with SLR
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Note (1): Extinction obtained using Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S)
Note (2): Errors take into account the corrections for correlations between
neighbouring pixels described in Sect. 2.3 of the article.
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Acknowledgements:
Mathieu Powalska, mathieu.powalka(at)sfr.fr
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(End) M. Powalka [Strasbourg Obs., France], P. Vannier [CDS] 14-Sep-2016