Submillimeter CO emission from shock-heated gas in the L1157 outflow

Details Submillimeter CO emission from shock-heated gas in the L1157 outflow Submillimeter CO emission from shock-heated gas in the L1157 outflow

2001-03-02

arxiv.org/abs/astro-ph/0103036v1

Astronomy and Astrophysics

Astrophysics

10 pages, 4 PDF figures, APJL in press

Scientific paper

10.1086/319649

We present the CO J=6-5, 4-3, and 3-2 spectra from the blueshifted gas of the outflow driven by the low-mass class 0 protostar in the L1157 dark cloud. Strong submillimeter CO emission lines with T_mb > 30 K have been detected at 63" (~0.13 pc) south from the protostar. It is remarkable that the blue wings in the submillimeter lines are stronger by a factor of 3-4 than that of the CO J=1-0 emission line. The CO line ratios suggest that the blueshifted lobe of this outflow consists of moderately dense gas of n(H_2) = (1-3)x10^4 cm^-3 heated to T_kin = 50-170 K.It is also suggested that the kinetic temperature of the outflowing gas increases from ~80 K near the protostar to ~170 K at the shocked region in the lobe center, toward which the largest velocity dispersion of the CO emission is observed. A remarkable correlation between the kinetic temperature and velocity dispersion of the CO emission along the lobe provides us with direct evidence that the molecular gas at the head of the jet-driven bow shock is indeed heated kinematically. The lower temperature of ~80 K measured at the other shocked region near the end of the lobe is explained if this shock is in a later evolutionary stage, in which the gas has been cooled mainly through radiation of the CO rotational lines.

Affiliated with

Also associated with

No associations

Rating

Submillimeter CO emission from shock-heated gas in the L1157 outflow 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 Submillimeter CO emission from shock-heated gas in the L1157 outflow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submillimeter CO emission from shock-heated gas in the L1157 outflow will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-301592