A candidate radio absorption line in the quasar PHL 61 - Some interpretations

Details A candidate radio absorption line in the quasar PHL 61 - Some interpretations A candidate radio absorption line in the quasar PHL 61 - Some interpretations

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63...25l&link_type=abstract

(Astronomicheskii Zhurnal, vol. 63, Jan.-Feb. 1986, p. 25-30) Soviet Astronomy (ISSN 0038-5301), vol. 30, Jan.-Feb. 1986, p. 16-

Astronomy and Astrophysics

Astronomy

4

Absorption Spectra, Line Spectra, Quasars, Radio Spectra, Spectrum Analysis, Cyanogen, Molecular Rotation, Optical Thickness, Red Shift

Scientific paper

An analysis of the radio spectrum of the quasar PHL 61 obtained by Takahara et al. (1983) permits to reveal the presence of a probable absorption feature at the frequency ν = 39.317 GHz. Its width is 5.2 MHz and the corresponding optical depth is 0.15. The authors suggest two possible identifications of the feature as the rotational line J = 0→1 of the 12C16O molecule at the redshift za(12C16O) = 1.9318 or the 12C17O molecule at za(12C17O) = 1.8578. The possibility of the identification of this absorption feature with hyperfine lines in K = 0→1 transition of CN at za(CN) = 1.8784 is also discussed. Some tests for the proposed identifications are considered.

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