Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71

Details Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71 Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...509..768g&link_type=abstract

The Astrophysical Journal, Volume 509, Issue 2, pp. 768-784.

Astronomy and Astrophysics

Astronomy

39

Ism: Abundances, Ism: Individual: Alphanumeric: Bhr 71, Ism: Jets And Outflows, Ism: Molecules

Scientific paper

We report observations of the J = 3 --> 2 and J = 2 --> 1 transitions of SiO and CS, the J_k = 3_k --> 2_k and J_k = 2_k --> 1_k transitions of CH_3OH, and the J = 1 --> 0 transition of HCO^+, made with Swedish-ESO Submillimetre Telescope (SEST), toward the highly collimated bipolar outflow BHR 71. Broad wing emission was detected toward the outflow lobes in all the observed molecular lines. The shapes of the profiles are strikingly different from molecule to molecule. For CS and HCO^+ the emission from the outflowing gas appears as a weak broad feature superposed upon a strong narrow emission from the quiescent ambient gas. For CH_3OH the intensity of the broad emission feature is considerably stronger than that of the narrow component, whereas for SiO the broad feature completely dominates the emission spectra. The spatial distribution of the integrated wing emission is considerably extended and broadly similar in all the observed molecular transitions, showing well-separated blueshifted and redshifted lobes with FWHM angular sizes of 2.4′ x 1.3′ and 2.4′ x 1.4′, respectively. We find that the abundance of methanol and silicon monoxide in the outflow lobes is enhanced with respect to that of the ambient cloud by factors of up to ~40 and 350, respectively. The large enhancements of methanol and silicon monoxide in the outflow lobes are most likely due to the release from grains of ice mantles and Si-bearing species via shocks produced by the interaction between the outflow and dense ambient gas. On the other hand, we find that the abundance of HCO^+ in the outflowing gas is smaller than that in the ambient gas by about a factor of 20, a decrease consistent with theoretical predictions of shock models.

Affiliated with

Also associated with

No associations

Rating

Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molecular Abundance Enhancements in the Highly Collimated Bipolar Outflow BHR 71 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-999306