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J/MNRAS/455/820     M87 globular cluster candidates catalog      (Oldham+, 2016)

A catalogue of the globular cluster candidates of M87. Oldham L.J., Auger M.W. <Mon. Not. R. Astron. Soc. 455, 820 (2016)> =2016MNRAS.455..820O (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, ugriz Keywords: galaxies: elliptical and lenticular, cD - galaxies: individual: M87 Abstract: We present a new photometric catalogue of the rich globular cluster (GC) system around M87, the brightest cluster galaxy in Virgo. Using archival Next Generation Virgo Cluster Survey images in the ugriz bands, observed with Canada-France-Hawaii Telescope/MegaPrime, we perform a careful subtraction of the galaxy's halo light in order to detect objects at small galactocentric radii as well as in the wider field, and find 17620 GC candidates over a radius range from 1.3 to 445kpc with g<24mag. By inferring their colour, radial and magnitude distributions in a Bayesian way, we find that they are well described as a mixture of two GC populations and two distinct contaminant populations, but confirm earlier findings of radius-dependent colour gradients in both GC populations. This is consistent with a picture in which the more enriched GCs reside deeper in the galaxy's potential well, indicating a role for dissipative collapse in the formation of both the red and the blue GCs. Description: A catalogue of 17620 globular cluster (GC) candidates, extending out to ∼440kpc around M87, is presented. Photometry in the CFHT ugriz bands is given for each object, along with probabilities of the given object belonging to the red GC, blue GC, Milky Way star or background populations. Magnitudes are reported in the AB system, and have been corrected for galactic extinction. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 228 17620 Globular cluster candidate catalogue
See also: J/ApJS/73/671 : M87 globular clusters BVI photometry (Couture+, 1990) J/AJ/106/493 : Globular clusters in M87 (Lee+, 1993) J/AJ/115/1801 : VRI photometry of M87 globular clusters (Harris+ 1998) J/ApJ/513/733 : Globular cluster system in M87 (Kundu+, 1999) J/ApJ/559/812 : Globular cluster system in M87 (Hanes+, 2001) J/ApJ/613/279 : ACS Virgo Cluster Survey. III. M87 (Jordan+, 2004) J/AJ/131/866 : Hot populations in M87 globular clusters (Sohn+, 2006) J/ApJ/703/42 : HST photometry of M87 globular clusters (Peng+, 2009) J/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
3- 10 F8.4 deg RAdeg Right ascension (J2000) 15- 21 F7.4 deg DEdeg Declination (J2000) 26- 32 F7.4 mag umag ?=99 AB magnitude in CFHT/MegaCam u-band 37- 43 F7.4 mag gmag ?=99 AB magnitude in CFHT/MegaCam g-band 48- 54 F7.4 mag rmag ?=99 AB magnitude in CFHT/MegaCam r-band 59- 65 F7.4 mag imag ?=99 AB magnitude in CFHT/MegaCam i-band 70- 76 F7.4 mag zmag ?=99 AB magnitude in CFHT/MegaCam z-band 81- 87 F7.4 mag e_umag ?=99 Uncertainty in u-band magnitude 92- 98 F7.4 mag e_gmag ?=99 Uncertainty in g-band magnitude 103-109 F7.4 mag e_rmag ?=99 Uncertainty in r-band magnitude 114-120 F7.4 mag e_imag ?=99 Uncertainty in i-band magnitude 125-131 F7.4 mag e_zmag ?=99 Uncertainty in z-band magnitude 137-142 F6.4 --- p(red) Probability of belonging to red GC population 148-153 F6.4 --- p(blue) Probability of belonging to blue GC population 159-164 F6.4 --- p(MW) Probability of belonging to Milky Way/Sagittarius stellar interloper population 170-175 F6.4 --- p(star) Probability of belonging to uniform-colour interloper population 181-186 F6.4 --- e_p(red) Uncertainty in probability of belonging to red GC population 192-197 F6.4 --- e_p(blue) Uncertainty in probability of belonging to blue GC population 203-208 F6.4 --- e_p(MW) Uncertainty in probability of belonging to Milky Way/Sagittarius stellar interloper population 214-219 F6.4 --- e_p(star) Uncertainty in probability of belonging to uniform-colour interloper population 221-224 I4 km/s HRV ?=0 Velocity (1) 226-228 I3 km/s e_HRV ?=0 Velocity uncertainty (1)
Note (1): From Strader et al. (2011ApJS..197...33S, Cat. J/ApJS/197/33). Set to zero if object is not included in kinematic sample.
Acknowledgements: Lindsay Oldham, ljo31(at)ast.cam.ac.uk
(End) L.J. Oldham [Univ. of Cambridge], Patricia Vannier [CDS] 21-Oct-2015
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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