Ammonia observations of L 1551

Details Ammonia observations of L 1551 Ammonia observations of L 1551

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..369m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 369-374.

Astronomy and Astrophysics

Astrophysics

39

Ammonia, Astronomical Spectroscopy, Cosmic Dust, Infrared Stars, Molecular Clouds, Astronomical Catalogs, Brightness Distribution, Gas Temperature, Spectral Line Width, Water Masers

Scientific paper

The Effelsberg 100-m telescope has been used to map the (1, 1) and (2, 2) transitions of NH3 in the molecular cloud surrounding the infrared source L 1551-IRS 5. A search for water maser emission in the area was also carried out. The ammonia brightness distribution, in contrast to a recent CS (J = 1 - 0) map, shows no obvious evidence for a rotating disk surrounding the infrared source. There is a structure approximately 30 sec south-west of IRS 5 which appears to be oriented roughly perpendicular to the bipolar outflow seen in CO observations. However, this is likely to be a background object and it is found that the high density gas seen in NH3 shows little evidence of interaction with the flow. Temperatures are 9-12 K throughout the cloud as expected for dark cloud gas heated by cosmic rays.

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