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J/ApJ/513/733       Globular cluster system in M87           (Kundu+, 1999)

The globular cluster system in the inner region of M87. Kundu A., Whitmore B.C., Sparks W.B., Macchetto F.D., Zepf S.E., Ashman K.M. <Astrophys. J. 513, 733 (1999)> =1999ApJ...513..733K
ADC_Keywords: Clusters, globular ; Photometry Keywords: galaxies: individual (M87) - galaxies: star clusters - surveys Abstract: We have identified 1057 globular cluster candidates in a WFPC2 image of the inner region of M87. The globular cluster luminosity function (GCLF) can be well fitted by a Gaussian profile with a mean value of m0V=23.67±0.07mag and σ=1.39±0.06mag. The GCLF in five radial bins is found to be statistically the same at all points, showing no clear evidence of dynamical destruction processes based on the luminosity function (LF). Similarly, there is no obvious trend between the half-light radius of the clusters and the galactocentric distance. The core radius of the globular cluster density distribution is Rc=56", considerably larger than the core of the stellar component (Rc=6.8"). The mean color of the cluster candidates is V-I=1.09mag, which corresponds to an average metallicity of Fe/H=-0.74dex. The color distribution is bimodal everywhere, with a blue peak at V-I=0.95mag and a red peak at V-I=1.20mag. The red population is only 0.1mag bluer than the underlying galaxy, indicating that these clusters formed late in the metal-enrichment history of the galaxy and were possibly created in a burst of star/cluster formation 3-6Gyr after the blue population. We also find that both the red and the blue cluster distributions have a more elliptical shape (Hubble type E3.5) than the nearly spherical galaxy. The average half-light radius of the clusters is ∼2.5pc, which is comparable to the 3pc average effective radius of the Milky Way clusters, although the red clusters are ∼20% smaller than the blue ones. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 45 100 Positions, magnitudes, and colors of the hundred objects closest to the nucleus of M87
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [KWS99] Identification number ([KWS99] NNN in Simbad) 5- 10 F6.2 arcsec oRA Offset in right ascension (1) 12- 17 F6.2 arcsec oDE Offset in declination (1) 19- 23 F5.2 arcsec Rad Radial distance of the cluster candidate from the center of M87 25- 29 F5.2 mag Vmag Johnson V magnitude 31- 35 F5.2 mag Imag Cousins Ic magnitude 37- 40 F4.2 mag V-Ic V-Ic colour index 42- 45 F4.2 mag e_V-Ic rms uncertainty on V-Ic
Note (1): Offsets from the observed center of M87 at RA=12:30:49.48, DE=12:23:29.38 (J2000)
History: From ApJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 27-May-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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