Extinction Maps and Dust-to-gas Ratios in Nearby Galaxies with LEGUS
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Abstract
We present a study of the dust-to-gas ratios in five nearby galaxies NGC 628
(M74), NGC 6503, NGC 7793, UGC 5139 (Holmberg I), and UGC 4305 (Holmberg II).
Using Hubble Space Telescope broad band WFC3/UVIS UV and optical images from
the Treasury program LEGUS (Legacy ExtraGalactic UV Survey) combined with
archival HST/ACS data, we correct thousands of individual stars for extinction
across these five galaxies using an isochrone-matching (reddening-free Q)
method. We generate extinction maps for each galaxy from the individual stellar
extinctions using both adaptive and fixed resolution techniques, and correlate
these maps with neutral HI and CO gas maps from literature, including The HI
Nearby Galaxy Survey (THINGS) and the HERA CO-Line Extragalactic Survey
(HERACLES). We calculate dust-to-gas ratios and investigate variations in the
dust-to-gas ratio with galaxy metallicity. We find a power law relationship
between dust-to-gas ratio and metallicity, consistent with other studies of
dust-to-gas ratio compared to metallicity. We find a change in the relation
when H
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1538-4357