Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar

Details Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0502w&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #05.02; Bulletin of the American Astronomical Society, Vol. 29, p.1213

Other

Scientific paper

The far-infrared source in L483 numbers among the youngest protostars. We report high angular resolution images of the submillimeter emission obtained with SCUBA on the JCMT, and high spatial and spectral resolution images of the NH_3(1,1) and (2,2) lines obtained with the VLA. These images suggest that the disk currently accretes matter from the surrounding cloud. The highest optical depth line is the main hyperfine component of the (1,1) line, which is much weaker than the satellite line near the FIR source. The velocity of this component shifts significantly blueward within 2000 AU of the FIR source. Such a shift signifies that material between the observer and the optically thick envelope of the protostellar core is moving away from the observer, or falling toward the protostar. The infall solution found by Shu (1977) was used to model the region interior to an expansion wave which propagates outward from the center of a singular isothermal sphere. Ammonia spectra were then synthesized and matched to the observations through adjustments to the model. The modeled profiles show enhanced linewidth in the (2,2) line relative to the (1,1) line, as well as a shift of emergent spectra towards lower line center velocity, though not so large as observed. We conclude that the ammonia images demonstrate that infall occurs within the central 5000 AU of the core centered on L483-FIR, but that more elaborate models will be necessary to fit the kinematics of the region in detail.

Affiliated with

Also associated with

No associations

Rating

Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar 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 Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and Kinematics of the Circumstellar Gas on Few Hundred AU scales near the L483 Protostar will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1172596