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 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 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