Shocked ammonia in the WR nebula NGC 2359

Details Shocked ammonia in the WR nebula NGC 2359 Shocked ammonia in the WR nebula NGC 2359

2001-04-20

arxiv.org/abs/astro-ph/0104330v1

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ Letters. 4 pages, 1 PS figure. Uses aastex.cls

Scientific paper

10.1086/320695

We report the detection of the (1,1) and (2,2) metastable lines of ammonia (NH_3) in the molecular cloud associated with the Wolf--Rayet (WR) nebula NGC 2359. Besides the CO and H_2, this is the first molecule detected in the environs of a WR star. Width (3 km/s) and radial velocity (54 km/s) indicate that the NH$_3$ lines arises from the molecular cloud which is interacting with the WR star. The rotational temperature derived from the (1,1) and (2,2) line intensity ratios is about 30 K, significantly larger than the typical kinetic temperature of the ambient gas of 10 K. The derived NH_3 abundance is 10^{-8}. Linewidth, abundance and kinetic temperature can be explained if NH_3 is released from dust grain mantles to the gas phase by shocks produced by the expansion of the bubble created by the WR stellar wind. We briefly discuss the implications of the detection of warm NH_3 associated with a WR star in connection to the hot NH_3 emission detected in the Galactic Center and in the nuclei of external galaxies.

Affiliated with

Also associated with

No associations

Rating

Shocked ammonia in the WR nebula NGC 2359 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 Shocked ammonia in the WR nebula NGC 2359, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shocked ammonia in the WR nebula NGC 2359 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-282954