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Date and Time of the Query: 2019-05-22 T14:20:58 PDT
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For refcode 2007ApJ...654..186F:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...654..186F The Discovery of Cepheids and a Distance to NGC 5128 Laura Ferrarese, Jeremy R. Mould, Peter B. Stetson, John L. Tonry, John P. Blakeslee, and Edward A. Ajhar Abstract. We discuss a new distance to NGC 5128 (Centaurus A) based on Cepheid variables observed with the Hubble Space Telescope. Twelve F555W (V) and six F814W (I) epochs of cosmic-ray-split WFPC2 observations were obtained. A total of 56 bona fide Cepheids were discovered, with periods ranging from 5 to ~50 days; five of these are likely Population II Cepheids of the W Virginis class, associated with the bulge or halo of NGC 5128. Based on the period and V- and I-band luminosities of a subsample of 42 classical (Population I) Cepheids, and adopting an LMC distance modulus and extinction of 18.50+/-0.10 mag and E(B-V)=0.10 mag, respectively, the true reddening-corrected distance modulus to NGC 5128 is {mu}_0_=27.67+/-0.12(random)+/-0.16(systematic) mag, corresponding to a distance of 3.42+/-0.18(random)+/-0.25(systematic) Mpc. The random uncertainty in the distance is dominated by the error on the assumed value for the ratio of total to selective absorption, R_V_, in NGC 5128, and by the possible metallicity dependence of the Cepheid period-luminosity relation at V and I. This represents the first determination of a Cepheid distance to an early-type galaxy. Key words: Stars: Variables: Cepheids, Cosmology: Distance Scale, Galaxies: Distances and Redshifts, Galaxies: Individual: NGC 5128
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