6.7 GHz methanol absorption toward the Seyfert 2 galaxy NGC 3079

Details 6.7 GHz methanol absorption toward the Seyfert 2 galaxy NGC 3079 6.7 GHz methanol absorption toward the Seyfert 2 galaxy NGC 3079

2008-05-07

arxiv.org/abs/0805.1063v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1051/0004-6361:200809985

The detection of the 6.7 GHz line of methanol (CH3OH) is reported for the first time toward an object beyond the Magellanic Clouds. Using the Effelsberg 100 m telescope, two absorption features were identified toward the Seyfert 2 galaxy NGC 3079. Both components probably originated on lines-of-sight toward the central region, presumably absorbing the radio continuum of the nuclear sources A, B, and E of NGC 3079. One absorption feature, at the systemic velocity, is narrow and may arise from gas not related to the nuclear environment of the galaxy. The weaker blue-shifted component is wider and may trace outflowing gas. Total A-type CH3OH column densities are estimated to be between a few times 10^13 and a few times 10^15 cm^-2. Because of a highly frequency-dependent continuum background, the overall similarity of HI, OH, and CH3OH absorption profiles hints at molecular clouds that cover the entire area occupied by the nuclear radio continuum sources ~ 4 pc.

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