VLA NH{_3} observations of regions of massive star formation in protostellar cores

Details VLA NH{_3} observations of regions of massive star formation in protostellar cores VLA NH{_3} observations of regions of massive star formation in protostellar cores

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...461..197w&link_type=abstract

Astronomy and Astrophysics, Volume 461, Issue 1, January I 2007, pp.197-204

Astronomy and Astrophysics

Astrophysics

2

Ism: Clouds, Ism: Kinematics And Dynamics, Stars: Formation

Scientific paper

Aims:The high angular resolution images with the Very Large Array (VLA) allow us to explore the general properties of protostellar cores in massive star forming regions at large distances. Methods: We observed the NH{_3} (J, K) = (1, 1) and (2, 2) lines toward five massive protostar candidates (IRAS 18196-1331, IRAS 18352-0148, IRAS 18361-0627, IRAS 18414-0339 and IRAS 19474+2637) with the VLA D configuration. Results: We found that these objects have hundreds of solar masses in dense gas with rotation temperatures from 8 to 27 K. No 1.3 cm continuum emission was detected at an rms of 0.7 mJy in all sources except IRAS 18361-0627. We identified 60 clumps and determined their physical parameters (e.g. line width, rotation temperature, size, and mass). The clump masses range from 0.1 M_&sun; to 4800 M_&sun;. The average size, line width and temperature are 0.1 ± 0.06 pc, 1.3 ± 0.4 km s-1 and 16 ± 5 K. The discrepancy between NH{_3} and (sub)mm continuum emission is found in IRAS 18196-1331. This phenomenon could occur as a result of the NH{_3} abundance variation being affected by the UV illumination.

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