Possible Infall around the Intermediate-Mass Young Stellar Object NGC 2264 IRS

Details Possible Infall around the Intermediate-Mass Young Stellar Object NGC 2264 IRS Possible Infall around the Intermediate-Mass Young Stellar Object NGC 2264 IRS

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...479l..67w&link_type=abstract

Astrophysical Journal Letters v.479, p.L67

Astronomy and Astrophysics

Astronomy

10

Line: Profiles, Molecular Data, Stars: Formation, Ism: Jets And Outflows, Ism: Individual Ngc Number: Ngc 2264

Scientific paper

Analysis of multitransitional CS and CO observations toward the class I intermediate-mass young stellar object NGC 2264 IRS indicates that the outflow associated with this source dominates the kinematic structure of the CS J = 2 --> 1, J = 3 --> 2, and J = 5 --> 4 spectra. For example, toward the source, centroid velocities (the first moments) of these line profiles increase with increasing optical depth; i.e., the emission becomes increasingly redshifted, which is expected for outflow from a central source. In contrast, the CS J = 7 --> 6 spectrum toward NGC 2264 IRS is asymmetric, having a single blueshifted peak with a red shoulder, which suggests the possible presence of infall toward NGC 2264 IRS. In addition, the centroid velocities for the CS J = 7 --> 6 line become more negative (lines are blueshifted) as one approaches the source perpendicular to the outflow. Furthermore, the CS J = 7 --> 6 line is blueshifted relative to the CS J = 2 --> 1, J = 3 --> 2, and J = 5 --> 4 lines toward NGC 2264 IRS. Integrated intensity contours of the CS J = 5 --> 4 emission are extended in the direction of the outflow; however, the CS J = 7 --> 6 emission is extended in the direction perpendicular to the outflow. We describe a preliminary attempt to model the CS J = 7 --> 6 spectra with a Monte Carlo radiative transfer code (Choi et al.) using an inside-out collapse scenario (Shu).

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