The distribution of the warm and dense molecular gas around Cepheus A HW 2

Details The distribution of the warm and dense molecular gas around Cepheus A HW 2 The distribution of the warm and dense molecular gas around Cepheus A HW 2

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.307...58t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 307, Issue 1, pp. 58-66.

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We present VLA observations of the (J, K)=(1, 1), (2, 2), (3, 3) and (4, 4) inversion transitions of NH_3 toward the HW 2 object in Cepheus A, with 1-arcsec angular resolution. Emission is detected in the main hyperfine line of the first three transitions. The NH_3(2, 2) emission shows a non-uniform `ring' structure, which is more extended (3arcsec) and intense than the emission seen in the (1, 1) and (3, 3) lines. A rotational temperature of ~30-50K and a lower limit to the mass of ~1 (XNH_3/10^-8)^-1M_solar are derived for the ring structure. The spatio-kinematical distribution of the NH_3 emission does not seem to be consistent with a simple circumstellar disc around the HW 2 thermal biconical radio jet. We suggest that it represents the remnant of the parental core from which both the inner 300-au (0.4 arcsec) disc, traced by the water maser spots previously found in the region, and the central object have formed. The complex velocity field of this core is probably produced from bound motions (similar to those of the inner disc) and from interaction with outflowing material.

Affiliated with

Also associated with

No associations

Rating

The distribution of the warm and dense molecular gas around Cepheus A HW 2 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 The distribution of the warm and dense molecular gas around Cepheus A HW 2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distribution of the warm and dense molecular gas around Cepheus A HW 2 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-997390