J/ApJ/872/202 CFHT ugi photometry of globular clusters in M85 (Ko+, 2019)
A wide-field photometric survey of globular clusters in the peculiar early-type
galaxy M85.
Ko Y., Lee M.G., Park H.S., Lim S., Sohn J., Hwang N., Park B.-G.
<Astrophys. J., 872, 202 (2019)>
=2019ApJ...872..202K 2019ApJ...872..202K
ADC_Keywords: Clusters, globular; Photometry, ugriz; Galaxies, nearby
Keywords: galaxies: clusters: individual (Virgo) ;
galaxies: elliptical and lenticular, cD ; galaxies: individual (M85) ;
galaxies: star clusters: general
Abstract:
We survey globular clusters (GCs) in M85 using ugi-band images of a
1°x1° field obtained with the MegaCam at the 3.6m
Canada-France-Hawaii Telescope. We identify 1318 GC candidates with
20.0mag<g0<23.5mag in the entire survey region. Their radial number
density profile is well fit by a Sersic profile with n=2.58-0.33+0.43
and effective radius Re,GCS=4.14' (=22kpc), showing that the
candidates at R<20' are mostly genuine GCs in M85. We estimate the
total number of GCs, N(total)=1216-50+82, and the specific
frequency, SN=1.41-0.06+0.10. The overall color distribution of
the GCs in M85 is bimodal, but the GCs in the central region at R<2'
do not show a bimodal distribution clearly. The radial number density
profile and surface number density map of the blue GCs (BGCs) show
more extended structures than those of the red GCs (RGCs). The spatial
distributions of both BGCs and RGCs are elongated, similar to that of
the galaxy stellar light. The number fraction of the RGCs in the
central region is much smaller compared to those in other early-type
galaxies of similar luminosity. The mean (g-i)0 color of the RGCs in
M85 is about 0.1mag bluer than typical values for other Virgo
early-type galaxies of similar luminosity, indicating that a
significant fraction of the RGCs in M85 may be younger than typical
GCs. These results indicate that M85 might have undergone a major wet
merger recently.
Description:
We carried out a wide-field photometric survey of globular clusters
(GCs) in M85 using MegaCam mounted on the Canada-France-Hawaii Telescope
(CFHT; program ID: 14AK06, PI: Myung Gyoon Lee) during 2014 May 26,
28, 29 and July 24.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 67 1318 A photometric catalog of the globular cluster (GC)
candidates in M85
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/ApJS/153/223 : ACS Virgo Cluster Survey. I. (Cote+, 2004)
J/ApJS/164/334 : ACS Virgo Cluster Survey. VI (Ferrarese+, 2006)
J/ApJS/171/101 : GCs in the ACS Virgo cluster survey (Jordan+, 2007)
J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007)
J/ApJ/681/197 : ACS Virgo Cluster Survey. XV (Peng+, 2008)
J/ApJS/180/54 : GC candidates in ACS Virgo survey. (Jordan+, 2009)
J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)
J/ApJS/197/33 : The M87 globular cluster system (Strader+, 2011)
J/MNRAS/420/37 : NGC 4365 globular clusters (Blom+, 2012)
J/ApJ/759/116 : Chemical analysis of NGC 4636 GCs (Park+, 2012)
J/A+A/543/A131 : NGC1316 GC candidates photometry (Richtler+, 2012)
J/A+A/555/A56 : T1C photometry of NGC7507 (Caso+, 2013)
J/ApJ/772/82 : A catalog of globular cluster systems (Harris+, 2013)
J/ApJ/773/L27 : GCs in ACSVCS early-type galaxies (Park+, 2013)
J/MNRAS/428/389 : SLUGGS GCs in early-type galaxies (Pota+, 2013)
J/MNRAS/451/2625 : SLUGGS Globular Cluster CaT and [Z/H] (Pastorello+, 2015)
J/ApJ/799/159 : GC populations in S4G galaxies (Zaritsky+, 2015)
J/ApJS/227/12 : NGVS XXV. Virgo GCs photometry (Powalka+, 2016)
J/MNRAS/461/4260 : NGC1316 (Fornax A) g'r'i' photometry (Sesto+, 2016)
J/ApJ/835/123 : Globular clusters in NGC 474 from CFHT obs. (Lim+, 2017)
J/A+A/611/A93 : NGC3115 & NGC1399 VEGAS-SSS GCs (Cantiello+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [GC]
3- 6 I04 --- Seq [1/1318] Running sequence number
8- 17 F10.6 deg RAdeg [185.8/186.9] Right Ascension (J2000)
19- 27 F9.6 deg DEdeg [17.5/18.6] Declination (J2000)
29- 34 F6.3 mag gmag [20.1/23.6] CFHT/MegaCam apparent g band magnitude
36- 40 F5.3 mag e_gmag [0.002/0.04] Error in gmag
42- 45 F4.2 mag u-g [0.83/1.92] The (u-g) color index
47- 50 F4.2 mag e_u-g [0.01/0.13] Error in u-g
52- 55 F4.2 mag g-i [0.55/1.25] The (g-i) color index
57- 60 F4.2 mag e_g-i [0.0/0.05] Error in g-i
62- 67 F6.3 mag C [-0.081/0.15] Concentration index (1)
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Note (1): The magnitude concentration index C defined as the i-band magnitude
differences between 4 pixel and 8 pixel diameter aperture photometry.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Aug-2020