PNLF Distances to Six Face-On Spiral Galaxies

Details PNLF Distances to Six Face-On Spiral Galaxies PNLF Distances to Six Face-On Spiral Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0416h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #04.16; Bulletin of the American Astronomical Society, V

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As the first step in our program to determine disk mass-to-light ratios in spiral galaxies, we have performed narrow-band imaging surveys in six face-on systems. In order from most to least massive, they are: M74, M83, M94, IC 342, NGC 6946, and NGC 5068. We have identified between 25 and 250 planetary nebulae (PNe) in each galaxy. The photometry of these PN populations enables us to determine a reliable distance to each spiral, which we compare to other distances in the literature. For the larger PN samples, we also split the data in half (inner vs. outer) to examine the luminosity functions derived from both regions to test for consistency and possible differences due to stellar populations and/or local extinction. In addition, we explore the luminosity-specific PN number density, NPN/Lgal, as a function of radial distance in the galactic disks to establish how well PNe trace the general disk stellar population.
This work is supported by NSF grant AST 06-07416 and a Pennsylvania Space Grant Fellowship.

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