A search for H2 emission in bipolar nebulae and regions of interstellar shock

Details A search for H2 emission in bipolar nebulae and regions of interstellar shock A search for H2 emission in bipolar nebulae and regions of interstellar shock

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..118p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 118-126.

Astronomy and Astrophysics

Astronomy

16

Infrared Astronomy, Nebulae, Shock Wave Interaction, Stellar Spectra, Balmer Series, Gas-Gas Interactions, H Ii Regions, Infrared Spectroscopy, Near Infrared Radiation

Scientific paper

A H2 emission survey of five bipolar outflow sources (NGC 1333, M2-9, As 353, S106, V645 Cyg), and one region of shock interaction between an H II region and molecular cloud (NGC 281) are presented. Two of the sources (M2-9, NGC 1333) were detected in the v = 1-0S(1), and Q-branch transitions of H2. A detailed analysis and modeling for these cases is provided. The probable mass of shocked H2 is shown to range between 1.4 x 10 to the -6th and 4.2 x 10 to the -8th solar masses for M2-9, and about 0.00025 and 0.00001910 solar masses in the case of NGC 1333, although the latter values may require increasing by a factor of a few when due allowance is made for extinction. A detailed analysis for the core of M2-9 indicates that the ionized zone is extremely compact, and that the Brackett line measures support other evidence in suggesting a high core extinction, large emission measure, and a projected angular radius of about 0.04 arcsec. Similarly, it is apparent from the H2S(1) line strength that the core expansion velocity must be low and less than about 1 km/s (a constraint which is also required on dynamical grounds). Finally, CO J = 3-2 observations of the source failed to detect emission above a 2-sigma limit of about 0.4 K, and this is shown to imply a probable expansion timescale of less than about 2000 yr.

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