Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720207s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #202.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The dust-to-gas ratio (DGR) controls many aspects of the state of the interstellar medium. Measuring the DGR requires a full accounting of dust, including cold dust that emits most strongly at far-IR and sub-mm wavelengths, and a full accounting of gas, including any molecular gas. Unfortunately, poorly-constrained cold dust masses, lack of molecular gas observations and a possibly varying conversion between CO line intensities and molecular gas masses (i.e. Xco) have made DGR measurements difficult, particularly resolved within galaxies. The availability of Herschel observations from the KINGFISH survey lets us take a major step forward in studying the variations in the dust-to-gas ratio and their drivers. We present a resolved study of the DGR in two nearby, face-on spiral galaxies observed with KINGFISH: NGC 6946 and M 101. We make use of new CO measurements from the HERACLES survey, a new generation survey of molecular gas in nearby galaxies at the IRAM 30m telescope. The combination of these datasets lets us study DGR and Xco as a function of radius and metallicity in these two galaxies. We also present new results on dust in the tidal feature of NGC 3077, a galaxy in the M 81 group observed as part of KINGFISH. Using these new observations from KINGFISH and HERACLES, we study the variations of DGR over a wide range of extragalactic environments.
Based on observations obtained with the Herschel Space Telescope as part of KINGFISH (Key Insights on Nearby Galaxies: a Far Infrared Survey with Herschel; P.I.: R.C. Kennicutt), one of the Herschel Open Time Key Projects.
Aniano G.
Calzetti Daniela
Draine Bruce T.
Kennicutt Robert C.
KINGFISH Team
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