The Search for Extragalactic Lithium Hydride

Details The Search for Extragalactic Lithium Hydride The Search for Extragalactic Lithium Hydride

2011-06-13

arxiv.org/abs/1106.2471v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 8 figures, accepted for publication in The Astrophysical Journal

Scientific paper

We have conducted Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of LiH, in absorption, toward three quasars. These quasars, B0218+357, PKS1830-211, and PKS0201+113, have redshifts of z = 0.685 - 3.387$, and shift the LiH J=1-0 transition to the 1 mm and 3mm wavelength bands, where atmospheric absorption is sharply reduced from that predominating near the rest frequency of 443 GHz. We report a 3$\sigma$ detection of LiH toward B0218+357 with a column density of 1.4x10^{12} cm^{-2} and place an upper limit on the ^6Li/^7Li ratio of <0.16. LiH was not detected toward any other source.

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