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Date and Time of the Query: 2019-06-25 T05:58:02 PDT
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For refcode 2000ApJ...533..125K:
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2000ApJ...533..125K The Globular Cluster Systems in the Coma Ellipticals. I. The Luminosity Function in NGC 4874 and Implications for Hubble's Constant1 J. J. Kavelaars and William E. Harris Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada; kavelaar@physics.mcmaster.ca, harris@physics.mcmaster.ca David A. Hanes Department of Physics, Queen's University, Kingston, ON K7L 3N6, Canada; hanes@astro.queensu.ca James E. Hesser Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, BC V8W 3P6, Canada; james.hesser@hia.nrc.ca and Christopher J. Pritchet Department of Physics and Astronomy, University of Victoria, Box 3055, Victoria, BC V8W 3P6, Canada; pritchet@phys.uvic.ca Received 1999 August 24; accepted 1999 November 17 ABSTRACT We have used deep Hubble Space Telescope WFPC2 images in V (F606W) and I (F814W) to measure the luminosity distribution of the globular clusters in NGC 4874, the central cD galaxy of the Coma cluster. We find the "turnover" point of the globular cluster luminosity function (GCLF) to lie at V = 27.88 +/- 0.12, while the overall GCLF shape matches the standard Gaussian- like form with dispersion {sigma}_V_ = 1.49 +/- 0.12. We use the GCLF as a standard candle by matching the turnover points in NGC 4874 and another Coma elliptical, IC 4051, with those of the giant ellipticals in the Virgo cluster (M87 and five others). The result is {DELTA}(m - M) (Coma-Virgo) = 4.06 +/- 0.11 mag, which converts to a Coma distance d = 102 Mpc if the Virgo distance modulus is (m - M)_0_ = 30.99 +/- 0.04. The Hubble constant which emerges from our GCLF measurement is then H_0_ = (69 +/- 9) km s^-1^ Mpc^-1^. We confirm this H_0_ value with a novel presentation of the "Hubble diagram" for GCLFs in giant E galaxies. Measurements of additional GCLFs in the Coma ellipticals, as well as calibrating galaxies in Virgo and Fornax, have excellent potential to refine this result in the near future. Subject headings: distance scale-galaxies: elliptical and lenticular, cD- galaxies: individual (NGC 4874)-galaxies: star clusters
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