Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.2103n&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #21.03; Bulletin of the American Astronomical Society, Vol. 30, p.1281
Astronomy and Astrophysics
Astronomy
Scientific paper
In an attempt to use Cepheid variables to determine the distance to the Centaurus cluster, we have obtained images of NGC 4603 with the Hubble Space Telescope on 9 epochs (totalling 24 orbits) over 14 months in the F555W filter and 2 epochs (6 orbits) in the F814W filter. This galaxy lies within the "Cen30" portion of the Centaurus cluster, which is concentrated around a redshift of ~ 3000 km/sec. Previous distance estimates for this cluster have varied significantly and presented disagreements with studies of large-scale structure, motivating our investigation. NGC 4603 is the most distant galaxy in which a search for Cepheids has been conducted. Using our WFPC2 observations, we have found a number of candidate Cepheid variable stars; however, at such faint magnitudes, magnitude measurement errors may lead to apparent variability of significant amplitude in intrinsically nonvarying stars. We have examined this effect through detailed simulations, and by means of a maximum likelihood analysis obtain limits on the distance of NGC 4603.
Davis Martin
Freedman Wendy L.
Madore Barry F.
Newman Jeffrey A.
Phelps Randy
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