J/MNRAS/402/803 M31 globular cluster system (Peacock+, 2010)
The M31 globular cluster system: ugriz and K-band photometry and structural
parameters.
Peacock M.B., MacCarone T.J., Knigge C., Kundu A., Waters C.Z., Zepf S.E.,
Zurek D.R.
<Mon. Not. R. Astron. Soc., 402, 803-818 (2010)>
=2010MNRAS.402..803P 2010MNRAS.402..803P
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, SDSS
Keywords: globular clusters: general - galaxies: individual: M31 -
galaxies: star clusters
Abstract:
We present an updated catalogue of M31 globular clusters (GCs) based
on images from the Wide Field Camera (WFCAM) on the United Kingdom
Infrared Telescope and from the Sloan Digital Sky Survey (SDSS). Our
catalogue includes new, self-consistent ugriz and K-band photometry of
these clusters. We discuss the difficulty of obtaining accurate
photometry of clusters projected against M31 due to small-scale
background structure in the galaxy. We consider the effect of this on
the accuracy of our photometry and provide realistic photometric error
estimates. We investigate possible contamination in the current M31 GC
catalogues using the excellent spatial resolution of these WFCAM
images combined with the SDSS multicolour photometry. We identify a
large population of clusters with very blue colours. Most of these
have recently been proposed by other works as young clusters. We
distinguish between these, and old clusters, in the final
classifications. Our final catalogue includes 416 old clusters, 156
young clusters and 373 candidate clusters. We also investigate the
structure of M31's old GCs using previously published King model fits
to these WFCAM images. We demonstrate that the structure and colours
of M31's old GC system are similar to those of the Milky Way. One GC
(B383) is found to be significantly brighter in previous observations
than observed here. We investigate all of the previous photometry of
this GC and suggest that this variability appears to be genuine and
short lived. We propose that the large increase in its luminosity may
have been due to a classical nova in the GC at the time of the
previous observations in 1989.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 175 1595 Photometry and structural parameters of M31 GCs
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See also:
J/A+A/416/917 : Revised Bologna Catalog of M31 GCs (Galleti+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Name taken from the RBC, Galleti et al.,
2004, Cat. J/A+A/416/917 (1)
20- 30 A11 --- OName Other names from RBV (J/A+A/416/917)
32- 39 F8.5 deg RAdeg Right ascension in decimal
degrees (J2000) (2)
41- 48 F8.5 deg DEdeg Declination in decimal degrees (J2000) (2)
50 I1 --- f Classification of the globular cluster (3)
51- 57 A7 --- n_f Additional classification for galaxies
59 I1 --- f1 ?=- Classification from the RBC V3.5 (3)
61- 69 A9 --- f2 Classification from Calwell et al.,
2009AJ....137...94C 2009AJ....137...94C
71- 74 F4.1 arcsec Rg ?=99.00 Aperture size used to obtain
total g magnitude
76- 80 F5.2 mag gmag ?=99.00 g magnitude
82- 86 F5.2 mag u-g ?=99.00 u-g colour index
88- 92 F5.2 mag g-r ?=99.00 g-r colour index
94- 98 F5.2 mag r-i ?=99.00 r-i colour index
100-104 F5.2 mag i-z ?=99.00 i-z colour index
107-111 F5.2 mag e_gmag ?=99.00 rms uncertainty on g total
magnitude, includes the statistical,
calibration and systematic errors
113-117 F5.2 mag e_u-g ?=99.00 rms uncertainty on u-g
119-123 F5.2 mag e_g-r ?=99.00 rms uncertainty on g-r
125-129 F5.2 mag e_r-i ?=99.00 rms uncertainty on r-i
131-135 F5.2 mag e_i-z ?=99.00 rms uncertainty on i-z
137-140 F4.1 arcsec RKs ?=99.00 Aperture size used to obtain
total Ks magnitude
142-146 F5.2 mag Ksmag ?=99.00 Ks magnitude
148-152 F5.2 mag e_Ksmag ?=99.00 rms uncertainty on Ksmag
154-158 F5.2 --- c ?=99.00 Concentration parameter
(C=log(rt/r0), r0 = core radius)
160-164 F5.2 pc rh ?=99.00 Half-light radius (4)
166-169 F4.1 pc rt ?=99.0 Tidal radius (4)
171-175 F5.2 [solLum/pc3] log(rho0) ?=99.00 Cluster core density
(in LK(☉)/pc3 units)
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Note (1): Sources identified as M31GC JHHMMSS+DDMMSS in Simbad.
Note (2): Position of object in SDSS r-band image
Note (3): Classification as follows:
1 = old globular cluster
2 = candidate cluster (21-candidate old cluster, 23-candidate young cluster)
3 = young cluster
4 = galaxy
5 = HII region
6 = stellar source
Note (4): assuming the distance of M31 to be 780kpc: McConnachie et al.
(2005MNRAS.356..979M 2005MNRAS.356..979M)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Jul-2010