Ammonia Maser in a Molecular Outflow toward W51

Details Ammonia Maser in a Molecular Outflow toward W51 Ammonia Maser in a Molecular Outflow toward W51

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...450l..63z&link_type=abstract

Astrophysical Journal Letters v.450, p.L63

Astronomy and Astrophysics

Astronomy

22

Masers, Ism: Individual Alphanumeric: W51, Ism: Clouds, Stars: Formation

Scientific paper

We report the discovery of a 14NH3 maser in the (J, K) = (3, 3) transition toward the W51-North H II complex. The maser line has a FWHM of 1.7 km s-1 and an asymmetric profile, which suggests multiple features in the velocity range. Measured with the VLA, the maser emission has a peak flux of 230 mJy and a maximum deconvolved size of 0."2. These values set a lower limit to the brightness temperature of 1.3 x 104 K. Thermal emission of ammonia was also detected toward this region. The elongated structure, velocity, and temperature gradients, and high excitation of the thermal ammonia indicate that the (3, 3) maser is excited in an expanding shell of a molecular outflow, powered possibly by the massive OB star D2. Molecular hydrogen densities and kinetic temperatures in the maser region are consistent with models of collisional pumping of the (3, 3) maser.

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