Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..681s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 3, p. 681-684
Astronomy and Astrophysics
Astronomy
17
Cosmic Dust, Emission Spectra, Interstellar Matter, Spiral Galaxies, Astronomical Maps, Cryogenic Temperature, Flux Density, Hydrogen, Infrared Astronomy Satellite
Scientific paper
We present a high resolution dust continuum map of the nearby spiral galaxy NGC 3627. Using the MPIfR 7-channel bolometer on the IRAM 30-m telescope, it was possible to trace the emission from cold (T approximately 20 K) dust along the spiral arms of this galaxy. The total flux density at lambda 1.28 mm = 570 +/- 90 mJy. Using reasonable assumptions about the column densities and the source angles of H2 for different temperatures, we fit a three component modified Planck function to the dust emission spectrum between 1.3 mm and 12 micrometers resulting in a dominant 19.5 K component for the large scale dust emission at mm wavelengths. The total flux density and dust temperature is used to estimate the total gas mass of this galaxy. Using Galactic values for the gas-to-dust ratio and for the absorption coefficient, the total gas mass is in excellent agreement with that obtained by CO measurements.
Haslam G. T. C.
Kreysa Ernst
Lemke Roland
Reuter H.-P.
Sievers A. W.
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