Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94...26m&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 26-30.
Astronomy and Astrophysics
Astronomy
4
Ammonia, Formaldehyde, Molecular Absorption, Oxygen, Quasars, Red Shift, Seyfert Galaxies, Water Masers, Astronomical Spectroscopy, Hydrogen, Interstellar Matter, Line Spectra, Opacity
Scientific paper
A search for molecular absorption redshifted to the same degree as the observed 21-cm hydrogen line in the directions of several Seyfert galaxies and quasars has been conducted to determine whether the observed absorption could be due to an intervening molecularly enriched object such as a galaxy. Observations were made with the NRAO 11-m antenna at Kitt Peak, the NRAO 42-m antenna at Green Bank, and the NRL 26-m antenna at Maryland Point Observatory. For the Seyfert galaxy 3C 84, the object with the greatest radio brightness in the survey, and for 3C 120, a CH2O opacity of 0.0001 is found which is less than that observed in all edge-on spiral galaxies. An H2O opacity limit of 0.014 excludes the possibility of any water masers between 0.13 and 4 kpc in front of 3C 84, and the opacity limit for CO implies an upper limit to its column density an order of magnitude less than predicted from the galactic CO/hydrogen ratio. The possible detection of the 118 GHz line of O2 in 3C 84 is, however, obtained.
Bologna J. M.
Matsakis Demetrios N.
Schwartz Phil R.
Thacker D. L.
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