Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...527l.117z&link_type=abstract
The Astrophysical Journal, Volume 527, Issue 2, pp. L117-L120.
Astronomy and Astrophysics
Astronomy
36
Ism: H Ii Regions, Ism: Clouds, Ism: Individual: Alphanumeric: Iras 20126+4104, Ism: Kinematics And Dynamics, Masers, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We present the discovery of shock-excited NH3 in a well-collimated jet associated with the extremely young high-mass star IRAS 20126+4104. The NH3 (3, 3) and (4, 4) emission is dominated by three clumps along the SiO jet. At the end of the jet, there exists strong and broad (+/-10 km s-1) NH3 (3, 3) emission. With typical brightness temperatures greater than 500 K, the overall emission indicates a weakly inverted population and appears in an arc, consistent with the excitation by bow shocks. There are two bright spots in the NH3 (3, 3) emission with brightness temperatures of approximately 2000 K. The narrow line width (1.5 km s-1 FWHM), the small sizes (<0.3"), and the unusually high brightness temperature of the features are indicative of maser emission. Our observations provide clear evidence that NH3 (3, 3) masers are excited in shock regions in molecular outflows.
Cesaroni Riccardo
Hunter Todd Russell
Sridharan Tirupati K.
Zhang Qizhou
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