The search for extragalactic lithium hydride

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We have conducted Combined Array for Research in Millimeter-wave Astronomy 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 1mm and 3mm wavelength bands, where atmospheric absorption is sharply reduced from that predominating near the rest frequency of 443GHz. We report a 3σ detection of LiH toward B0218+357 with a column density of 1.4 × 1012cm-2 and place an upper limit on the 6Li/7Li ratio of <0.16. LiH was not detected toward any other source.

Original languageEnglish (US)
Article number37
JournalAstrophysical Journal
Issue number1
StatePublished - Sep 1 2011


  • ISM: molecules
  • astrochemistry
  • radio lines: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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