The molecular core in the AFGL 5157 region

Details The molecular core in the AFGL 5157 region The molecular core in the AFGL 5157 region

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..528t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 10, 1992, p. 528-535. Research supported by SEUI, Direccio Genera

Astronomy and Astrophysics

Astrophysics

15

Ammonia, Interstellar Matter, Molecular Flow, Pre-Main Sequence Stars, Astronomical Maps, Imaging Techniques, Near Infrared Radiation, Nebulae

Scientific paper

Results of simultaneous NH3(1,1) and NH3(2,2) observations toward the bipolar molecular outflow in the AFGL 5157 system are presented, as are results of near infrared observations and CCD images of the region. The high-density molecular core, as traced by the ammonia observations, appears resolved in the north-south direction but unresolved in the east-west direction, with a size of approximately 1.3 x 0.7 (or less) arcmin. This core is located near the geometrical center of the bipolar molecular outflow with an orientation perpendicular to its axis. The mass of the ammonia core is much larger than that of the bipolar molecular outflow. The results suggest that the elongated structure was formed before the outflow phenomenon occurred and that it may play an important role in the collimation processes of the bipolar molecular outflow at interstellar scales (about 0.1 pc).

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