J/ApJ/682/135 CCD photometry of M60 (Lee+, 2008)
Washington CCD photometry of the globular cluster system of the giant elliptical
galaxy M60 in Virgo.
Lee M.G., Park H.S., Kim E., Hwang H.S., Kim S.C., Geisler D.
<Astrophys. J., 682, 135-154 (2008)>
=2008ApJ...682..135L 2008ApJ...682..135L
ADC_Keywords: Clusters, globular ; Photometry, CCD ; Galaxies, nearby ;
Photometry, CMT1T2V
Keywords: galaxies: clusters: general - galaxies: individual (M60) -
galaxies: photometry - galaxies: star clusters
Abstract:
We present a photometric study of the globular clusters (GCs) in the
giant elliptical galaxy M60 in the Virgo Cluster, based on deep,
relatively wide field Washington CT1 CCD images. The CMD reveals a
significant population of GCs in M60 and a large number of young
luminous clusters in NGC 4647, a small companion spiral northwest of
M60. The color distribution of the GCs in M60 is clearly bimodal, with
a blue peak at (C-T1)=1.37 and a red peak at (C-T1)=1.87. We
derive two new transformation relations between the (C-T1)0 color
and [Fe/H] using the data for the GCs in our Galaxy and M49. Using
these relations, we derive the metallicity distribution of the GCs in
M60, which is also bimodal: a dominant metal-poor component with
center at [Fe/H]=-1.2, and a weaker metal-rich component with center
at [Fe/H]=-0.2. We estimate the total number of the GCs in M60 to be
3600±500 and the specific frequency to be SN=3.8±0.4.
Description:
CCD images of M60 were obtained on the photometric nights of 1997
April 9 and 10 (UT) at the Kitt Peak National Observatory (KPNO) 4m
telescope using the 2048x2048 pixel CCD camera at the prime focus.
Washington C and Kron-Cousins R filters were used.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 68 4708 CT1 photometry of the measured point sources
with σ(C-T1)<0.3 in M60
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See also:
J/ApJ/674/857 : Radial velocities and CT1 magnitudes in M60 galaxy (Lee+,
2008)
J/MNRAS/355/608 : NGC 4649 (M60) globular clusters (Forbes+, 2004)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Source ID number (<[LHP2008] NNNNN> in Simbad)
7- 13 F7.2 pix Xpix The X-coordinate on the chip (1)
15- 21 F7.2 pix Ypix The Y-coordinate on the chip (1)
23- 32 F10.6 deg RAdeg Right Ascension (J2000) in decimal degrees
34- 42 F9.6 deg DEdeg Declination (J2000) in decimal degrees
44- 49 F6.3 mag T1mag The T1 band magnitude
51- 55 F5.3 mag e_T1mag Error in T1mag
57- 62 F6.3 mag C-T1 The (C-T1) color index
64- 68 F5.3 mag e_C-T1 Error in C-T1
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Note (1): Xpix and Ypix increase toward east and north, respectively.
A pixel corresponds to 0.47 arcsec.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Nov-2010