High density structure of the L 1455 dark cloud

Details High density structure of the L 1455 dark cloud High density structure of the L 1455 dark cloud

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..432j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 432-443.

Astronomy and Astrophysics

Astrophysics

13

Astronomical Spectroscopy, Dark Matter, Interstellar Matter, Molecular Clouds, Star Formation, Molecular Flow, Radio Spectra

Scientific paper

The dark cloud L 1455, in the local Perseus complex, has been mapped with moderate angular resolution (2 and 1 arcmin) in the 1 - 0 and 2 - 1 lines of CS and C(S-34) and with high angular resolution (40 arcsec beam) in the (1,1) and (2,2) lines of NH3. These observations provide, for the first time, a very detailed picture of the cloud structure over different scales. Two velocity components (at 4.8 and 5.5 km/s) are observed in this region of the sky. We have produced maps of the two clouds, and we find that the 4.8 km/s cloud is the one related to the star formation and outflow activity. The physical conditions of the dense gas have been derived from our multiline observations. The dense core, traced by the NH3 emission, is fragmented in several clumps with masses of 0.6 to 4 solar masses, kinetic temperatures of 12 K, and central densities of a few x 10,000/cu cm. These clumps are slightly heated toward the edges. In spite of the fact that the CS lines become excited at densities higher than those required by the NH3 lines, the CS is observed to be spatially more extended than the NH3 emission. We tentatively conclude that no ammonia molecules are present at the outer regions of the cloud, where CS is still well detected; this ammonia deficiency could be due to photodissociation effects.

Affiliated with

Also associated with

No associations

Rating

High density structure of the L 1455 dark cloud 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 High density structure of the L 1455 dark cloud, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High density structure of the L 1455 dark cloud will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1440611