Detection of extragalactic CF+ toward PKS 1830-211 Chemical differentiation in the absorbing gas

• We report the first extragalactic detection of the fluoromethylidynium ion CF+ in the z = 0.89 absorber toward PKS 1830-211. We estimate an abundance of similar to 3 x 10(-10) relative to H-2 and that similar to 1% of fluorine is captured in CF+. The absorption line profile of CF+ is found to be markedly different from that of other species observed within the same tuning, and is notably anticorrelated with CH3OH. On the other hand, the CF+ profile resembles that of [CI]. Our results are consistent with expected fluorine chemistry and point to chemical differentiation in the column of absorbing gas.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

ISM: molecules

galaxies: ISM

quasars: absorption lines

quasars: individual: PKS1830-211

radio lines: galaxies

galaxies: abundances

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