A study of the dust distribution and extinction law in MON R2

Details A study of the dust distribution and extinction law in MON R2 A study of the dust distribution and extinction law in MON R2

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158..143n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 143-148. NASA-supported research.

Astronomy and Astrophysics

Astronomy

7

Cosmic Dust, Infrared Astronomy, Interstellar Extinction, Clumps, H Ii Regions, Hydrogen Recombinations, Infrared Spectroscopy, Line Spectra, Molecular Clouds

Scientific paper

Observations were obtained at wavelengths from 1.5 to 7.5 microns with beams varying in diameter from 4 to 28 arcsec of infrared hydrogen recombination lines toward the Mon R2 IRS1 H II region. It is found that the data cannot be fitted with the extinction law which characterizes the interstellar medium unless the obscuring matter is clumped on a small scale of not greater than 0.3 arcsec; in which case considerable fluctuations in the amount of extinction on scales smaller than 1 arcsec are expected. The data of Simon et al. (1983) suggest a dip in the extinction about 5 arcsec from the 2-micron and radio continuum peak, and rule out models with uniform dust and clump distributions.

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