Letter to the Editor
Search for LiH in the ISM towards B0218+357
Received 21 April 1998 / Accepted 28 April 1998
We report a tentative detection with the IRAM 30m telescope of the LiH molecule in absorption in front of the lensed quasar B0218+357. We have searched for the rotational line of lithium hydride at 444 GHz (redshifted to 263 GHz). The line, if detected, is optically thin, very narrow, and corresponds to a column density of N(LiH) = 1.6 1012 cm-2 for an assumed excitation temperature of 15 K, or a relative abundance LiH/H 3 10-12. We discuss the implications of this result.
Key words: ISM: general, abundances, molecules galaxies: ISM quasars: absorption lines radio lines: ISM
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© European Southern Observatory (ESO) 1998
Online publication: June 2, 1998