1998/09/21 by M. A. Pahre, J. R. Mould, A. Dressler +18 · 1 citation
Engineering · Mathematics · Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Brightness #CCD and CMOS Imaging Sensors #Computer science #Elliptical galaxy #Galaxy #Geometry #Hubble Deep Field #Hubble Ultra-Deep Field #Hubble sequence #Hubble space telescope #Mathematics #Physics #Space (punctuation) #Stellar, planetary, and galactic studies #Surface (topology) #Surface brightness #astro-ph
paper · pdf · doi:10.1086/306998
to appear in The Astrophysical Journal; 25 pages, including 7 Postscript figures and 2 tables; uses AAS LaTeX style files
arxiv created 1998/09/21 · openalex publication_date 1999/04/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Surface brightness fluctuations (SBF) have been detected for three elliptical galaxies-NGC 3379 in the Leo group, NGC 4406 in the Virgo cluster, and NGC 4373 in the Hydra-Centaurus supercluster-using marginally sampled, deep images taken with the Planetary Camera of the WFPC2 instrument on the Hubble Space Telescope (HST). The power spectrum of the fluctuations image is well fitted by an empirical model of the point-spread function constructed using point sources identified in the held. Comparison with high-quality ground-based observations of all three galaxies show excellent agreement in the measurement of the distance modulus over a substantial range in distance. This demonstrates the capability of the Planetary Camera of WFPC2 to measure distances using the SBF technique despite the marginal sampling and small spatial coverage of the images. The residual variance due to unresolved sources in all three galaxies is only 2%-5% of the detected fluctuations signal, which confirms the advantage of HST imaging in minimizing the uncertainty of this SBF correction. Extensive consistency checks, including an independent SBF analysis using an alternate software package, suggest that our internal uncertainties are <0.02 mag. The fluctuations magnitude for NGC 4373 is /_(F814W) = 31.31±0.05 mag, corresponding to a distance modulus of (m-M)0 = 32.99±0.11. This implies a peculiar velocity for this galaxy of 415±330 km s^(-1), which is smaller than derived from the Dn-σ relation.