Global Collapses and Expansions in Star-Forming Clouds

Details Global Collapses and Expansions in Star-Forming Clouds Global Collapses and Expansions in Star-Forming Clouds

2009-09-07

arxiv.org/abs/0909.1130v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 7 figures, accepted for publication in MNRAS

Scientific paper

Spectral molecular line profile observations of star-forming molecular clouds sometimes show distinct red asymmetric double-peaked molecular line profiles with weaker blue peaks and stronger red peaks. For some star-forming molecular clouds, such molecular transitions with red asymmetric line profiles and blue asymmetric line profiles (i.e. blue asymmetric double-peaked molecular line profiles with weaker red peaks and stronger blue peaks) may coexist in spatially resolved spectral observations, while for others, such molecular transitions with red asymmetric line profiles may completely dominate in spatially resolved spectral observations. Blue asymmetric line profiles are usually interpreted as signals of central core collapses, while red asymmetric line profiles remain unexplained. In this paper, we advance a spherically symmetric self-similar hydrodynamic model framework for envelope expansions with core collapses (EECC) of a general polytropic molecular gas cloud under self-gravity. Based on such EECC hydrodynamic cloud models, we perform tracer molecular line profile calculations using the publicly available RATRAN code for star-forming clouds with spectroscopic signatures of red asymmetric line profiles. The presence of red asymmetric line profiles from molecular cloud cores indicates that EECC processes are most likely an essential hydrodynamic process of star formation. With spatial distributions, we explore various profiles of molecular lines for several tracer molecules in different settings of EECC dynamic models with and without shocks.

Affiliated with

Also associated with

No associations

Rating

Global Collapses and Expansions in Star-Forming Clouds 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 Global Collapses and Expansions in Star-Forming Clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global Collapses and Expansions in Star-Forming Clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-295105