Search for LiH in the ISM towards B0218+357

Details Search for LiH in the ISM towards B0218+357 Search for LiH in the ISM towards B0218+357

1998-04-28

arxiv.org/abs/astro-ph/9804303v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, accepted in A&A Letters

Scientific paper

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 J = 0 -- 1 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 10$^{12}$ cm$^{-2}$ for an assumed excitation temperature of 15 K, or a relative abundance LiH/H$_2 \sim$ 3 10$^{-12}$. We discuss the implications of this result.

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