The dense, inner part of the protostellar disk - Protostar candidates in GGD 27 IRS

Details The dense, inner part of the protostellar disk - Protostar candidates in GGD 27 IRS The dense, inner part of the protostellar disk - Protostar candidates in GGD 27 IRS

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..560y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 560-566.

Astronomy and Astrophysics

Astronomy

13

Infrared Sources (Astronomy), Interstellar Matter, Nebulae, Protostars, Star Formation, Accretion Disks, Astronomical Spectroscopy, Carbon Monoxide, H Ii Regions, Herbig-Haro Objects, Rotational Spectra, Spectral Emission

Scientific paper

The paper presents aperture synthesis observations of the continuum emission at 2.6 mm and of the CO J = 1-0 emission around a prototypical bipolar outflow and disk system GGD 27 IRS, using the Nobeyama Millimeter Array (NMA). The continuum emission consists of three peaks unresolved with a synthesized beam of 3.8 x 5.5 aresec. The emission is most likely of thermal origin from cold dust in massive cores. The unresolved peak is expected from the previous model assuming a power law distribution of dust. However, the total flux density of the peaks shows an excess over that of the model. The excess may be produced by accretion disks. One of the peaks, CS 2, is identified to be an exciting source of the molecular outflow, an infrared reflection nebula, an ultracompact H II region, a radio jet, and HH objects. CS 3 may be associated with a new compact molecular outflow but shows no other activities of star formation. CS 1 appears not to be associated with any activities so far identified and is a protostar candidate.

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