The density structure of the protostellar disk - A power-law distribution of the dust around GGD 27 IRS

Details The density structure of the protostellar disk - A power-law distribution of the dust around GGD 27 IRS The density structure of the protostellar disk - A power-law distribution of the dust around GGD 27 IRS

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..615y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 615-619. Research supported by MOESC.

Astronomy and Astrophysics

Astronomy

12

Cosmic Dust, Infrared Sources (Astronomy), Interstellar Matter, Protostars, Star Formation, Stellar Envelopes, Astronomical Models, Astronomical Photometry, Continuous Radiation, Energy Spectra, Submillimeter Waves

Scientific paper

Submillimetar continuum observations have been conducted toward GGD 27 IRS, a well-defined bipolar outflow plus dense disk system. Photometry was done in the wavelength range of 350 microns to 1.1 mm toward the peak, and spatial distributions at 450 and 800 microns were measured. Both emissions consist of a very compact (FWHM approximately equal to 20 arcsec) core and a diffuse component which is aligned to the previously known dense molecular disk. A numerical model calculation that fits to the current data favors power-law radial distributions of dust density and temperature, with exponents of alpha = 1.8-2.2 and gamma = 0.2-0.4 and a spectral index of the dust emissivity beta = 1.5. The dust distribution, and hence, the total mass distribution thus derived reproduce the nature of the simulated model of the rotating isothermal cloud. The total gas and dust mass of the disk is estimated to be about 100 solar masses within the radius of 30 arcsec, assuming a dust emissivity of 3.9 sq cm/g at 400 microns and a gas-to-dust ratio of 100.

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