Vibrationally excited CS: A new probe of conditions in young protostellar systems

Details Vibrationally excited CS: A new probe of conditions in young protostellar systems Vibrationally excited CS: A new probe of conditions in young protostellar systems

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l.127w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 2, p. L127-L130

Astronomy and Astrophysics

Astrophysics

11

Accretion Disks, Binary Stars, Carbon Compounds, Emission Spectra, Protostars, Sulfur Compounds, Vibrational Spectra, Gas Density, Gas Temperature, Red Shift, Shock Waves, Stellar Models

Scientific paper

We present the first detection of vibrationally excited C(32)S J = 10-9 and J = 7-6 emission toward a young stellar object (YSO). Toward IRAS 16293-2422, the vibrationally excited C(32)S emission is redshifted approximately 3.9 km/s from the systemic velocity of the core. The emission must arise in warm (T greater than or approximately equal 1000 K), dense (n greater than or approximately equal to 1011-1012 per cc) gas. The most plausible origin for the emission appears to be self-gravitating instabilities in a protostellar accretion disk, which produce waves and shocks.

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