CO molecules in the quasars 1556 + 3517 and 0840 + 3633

Details CO molecules in the quasars 1556 + 3517 and 0840 + 3633 CO molecules in the quasars 1556 + 3517 and 0840 + 3633

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..625d&link_type=abstract

Astronomy Letters, Volume 25, Issue 10, October 1999, pp.625-627

Astronomy and Astrophysics

Astronomy

Scientific paper

A new subclass of weakly ionized BAL-quasars, introduced by Becker et al. (1997) and represented by three quasars, 1556+3517, 0840+3633, and 0059-2735, is considered. Their optical spectra are distinguished by extremely strong absorption both in the lines and in the continuum, as well as by the absence of emission features. These peculiarities of the spectra can be explained by the presence of molecules, which are responsible for strong absorption lines, in the outer layers of these quasars. In particular, it is proposed to identify again the line lambda = 2063 A (assigned to CrII) as the line belonging to the Cameron band a^3Pi_i <- X^1Sigma^+ of the CO molecule. The expected optical depth in the rotational transition of the molecule is estimated. It is proposed to carry out radio observations of these quasars to test the molecular hypothesis.

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