The ACS Nearby Galaxy Survey Treasury III: Cepheids in the Outer Disk of M81

Abstract

The ACS Nearby Galaxy Survey Treasury (ANGST) has acquired deep ACS imaging of a field in the outer disk of the large spiral galaxy M81. These data were obtained over a total of 20 HST orbits, providing a baseline long enough to reliably identify Cepheid variable stars in the field. Fundamental mode and first overtone types have been distinguished through comparative fits with corresponding Cepheid light curve templates derived from principal component analysis of confirmed Cepheids in the LMC, SMC, and Milky Way. A distance modulus of 27.78 pm 0.05_random pm 0.14_systematic with a corresponding distance of 3.60 pm 0.23 Mpc has been calculated from a sample of 11 fundamental mode and 2 first overtone Cepheids (assuming an LMC distance modulus of mu_LMC=18.41 pm 0.10_r pm 0.13_s).

arXiv comment10 pages, 9 figures. Accepted for publication in AJ Fixed typos

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• The Optical Structure of the Starburst Galaxy M82. II. Nebular Properties of the Disk and Inner-Wind
• Redshift-Independent Distances in the NASA/IPAC Extragalactic Database: Methodology, Content and Use of NED-D
• Revisiting the abundance gradient in the maser host galaxy NGC 4258
• Testing galaxy formation models with the GHOSTS survey: The color profile of M81's stellar halo
• Deep HST/ACS Photometry of the M81 Halo
• A Panoply of Cepheid Light Curve Templates
• A Direct Stellar Metallicity Determination in the Disk of the Maser Galaxy NGC4258
• Panchromatic Hubble Andromeda Treasury XIII: The Cepheid period-luminosity relation in M31
• New Insights into Time Series Analysis - I - Correlated observations
• New Insights into Time Series Analysis II -- No Correlated Observations
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