J/MNRAS/355/608 NGC 4649 (M60) globular clusters (Forbes+, 2004)
Gemini/GMOS imaging of globular clusters in the Virgo galaxy NGC 4649 (M60).
Forbes D.A., Faifer F.R., Forte J.C., Bridges T., Beasley M.A.,
Gebhardt K., Hanes D.A., Sharples R., Zepf S.E.
<Mon. Not. R. Astron. Soc., 355, 608-616 (2004)>
=2004MNRAS.355..608F 2004MNRAS.355..608F
ADC_Keywords: Clusters, globular ; Photometry, SDSS
Keywords: globular clusters: general - galaxies: individual: NGC 4649 -
galaxies: star clusters
Abstract:
We present Sloan g and i imaging from the Gemini Multi-object
Spectrograph (GMOS) instrument on the Gemini North telescope for the
globular cluster (GC) system around the Virgo galaxy NGC 4649 (M60).
Our three pointings, taken in good seeing conditions, cover an area of
about 90 square arcmin. We detect 2151 unresolved sources. Applying
colour and magnitude selection criteria to this source list gives 995
candidate GCs. Our source list is greater than 90 per cent complete to
a magnitude of i=23.6, and has little contamination from background
galaxies. We find fewer than half a dozen potential ultracompact dwarf
galaxies around NGC 4649.
Description:
Images were taken of NGC 4649 using the GMOS in imaging mode on the
Gemini North telescope on 2002 April 10, 11 and 14.
Objects:
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RA (2000) DE Designation(s)
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12 43 40.2 +11 33 09 NGC 4649 = M 60
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 2151 Candidate NGC 4649 globular clusters
tablea1.dat 55 912 Resolved objects in the field of NGC 4649
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Byte-by-byte Description of file: table1.dat tablea1.dat
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Bytes Format Units Label Explanations
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2- 9 F8.2 pix Xpos X position (1)
12- 19 F8.2 pix Ypos Y position (1)
22- 27 F6.2 arcsec RadGC Galactocentric radius
30- 34 F5.2 mag imag Modified Sloan i magnitude (i at 780nm)
37- 41 F5.2 mag g-i Modified Sloan g-i colour index (g at 475nm)
45- 48 F4.2 mag e_imag rms uncertainty in imag
52- 55 F4.2 mag e_g-i rms uncertainty in g-i
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Note (1): X-, Y-position, defined in a rectangular system with its origin
at the galaxy centre with X positive towards west and Y positive
towards the north. 1 pix=0.072".
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-May-2005