Plateau-De Observations of mm-Wave Molecular Absorption Toward BL-Lacertae

Details Plateau-De Observations of mm-Wave Molecular Absorption Toward BL-Lacertae Plateau-De Observations of mm-Wave Molecular Absorption Toward BL-Lacertae

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276l..33l&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. L33, 1993

Astronomy and Astrophysics

Astrophysics

43

Scientific paper

We have used the Plateau de Bure Interferometer to observe λ3mm 1-0 absorption line profiles of ^13^CO, HCO^+^, C_2_H, CN, HCN, HNC, and N_2_H^+^ formed in a nearby molecular cloud occulting BL Lac (2200+420): only N_2_ H^+^ was not seen. The observed optical depths, typically 0.3 - 1.5, provide highly reliable total column densities because the excitation is quite weak. The relative abundances of ^13^CO, HCO^+^, HCN, CN, and C_2_H follow those cited for TMC-1 but N_2_H^+^ and HNC are deficient toward BL Lac by factors of 3 - 6. Only ^13^CO and HCO^+^ were seen in emission with the 12m NRAO telescope. The latter provides an estimate of the pressure nH_2_ T_K_ = 4 - 5 x 10^4^ cm^-3^ K.

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