The Search for Extragalactic Lithium Hydride
D. N. Friedel, Athol Kemball, and Brian D. Fields

TL;DR
This study reports the detection of lithium hydride in an extragalactic source using millimeter-wave observations, providing insights into interstellar chemistry at high redshifts.
Contribution
First detection of extragalactic lithium hydride in absorption, demonstrating the feasibility of using millimeter-wave observations for such studies.
Findings
LiH detected toward B0218+357 with a specific column density
Upper limit set on the ^6Li/^7Li isotopic ratio
LiH not detected in other observed quasars
Abstract
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\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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