Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725112b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #251.12; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of a survey of H α emission line regions in M33 and seven dwarf galaxies in the Local Group (NGC6822, IC10, WLM, Sextans A and B, Phoenix and Pegasus). Using data from the Local Group Galaxy Survey (LGGS - see Massey et al, 2006)), we used continuum-subtracted Hα emission line images to define emission regions with a faint flux limit of 10 -17 ergs-sec-1-cm-2 above the background. We have obtained photometric measurements for over 4000 H α emission regions in M33 and five of the seven dwarf galaxies. Using these regions, with boundaries defined by their H α-emission, we also determined fluxes for the continuum-subtracted [OIII] and [SII] images and constructed a catalog of H α fluxes, region sizes and [OIII]/ H α and [SII]/ H α line ratios. The HII region luminosity functions and size distributions for spiral galaxy M33 are compared with those of the dwarf galaxies NGC 6822 and IC10. For M33, the average [SII]/ H α line ratios, plotted as a function of galactocentric radius, display a linear trend with a very shallow slope. The galaxy-wide averages of [SII]/ H α line ratios correlate with the masses of the dwarf galaxies following the previously established dwarf galaxy mass-metallicity relationship. An interactive catalog of these LGGS emission line surveys will be made available on-line.
Blaha Cindy
Cawthon R.
Dixon Matthew
Hodge Paul
Johnson Teresa
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