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arXiv:astro-ph/9611139 (astro-ph)
[Submitted on 18 Nov 1996]

Title:Globular Cluster Luminosity Functions and the Hubble Constant from WFPC2 Imaging: Galaxies in the Coma I Cloud

Authors:Duncan A. Forbes (Lick Observatory)
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Abstract: The membership of some galaxies in the nearby (d ~ 12 Mpc) Coma I cloud is uncertain. Here we present globular cluster luminosity functions (GCLFs) from the HST for two bright ellipticals which may belong to this group. After fitting the GCLF, we find a turnover magnitude of m_V^0 = 23.23 +/- 0.11 for NGC 4278 and m_V^0 = 23.07 +/- 0.13 for NGC 4494. Our limiting magnitude is about two magnitudes fainter than these values, making this data among the most complete GCLFs published to date. The fitted GCLF dispersions (~ 1.1 mag.) are somewhat smaller than typical values for other ellipticals. Assuming an absolute turnover magnitude of M_V^0 = -7.62, and after applying a small metallicity correction, we derive distance modulii of (m -- M) = 30.61 +/- 0.14 for NGC 4278 and 30.50 +/- 0.15 for NGC 4494. These distance estimates are compared to other methods, and lie within the published range of values. We conclude that both galaxies lie at the same distance and are both members of the Coma I cloud.
Comments: 13 pages, Latex. Full paper also available at this http URL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/9611139
  (or arXiv:astro-ph/9611139v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/9611139
Journal reference: Astronomical Journal 1996 112 1409
Related DOI: https://doi.org/10.1086/118108

Submission history

From: Duncan Alan Forbes [view email]
[v1] Mon, 18 Nov 1996 18:28:05 UTC (70 KB)
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