High-velocity HCO(+) in Cepheus A - Ionization levels in high-density clumps within a molecular flow

Details High-velocity HCO(+) in Cepheus A - Ionization levels in high-density clumps within a molecular flow High-velocity HCO(+) in Cepheus A - Ionization levels in high-density clumps within a molecular flow

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..707l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 707-722. Research supported by the Naturvetenskaplig

Astronomy and Astrophysics

Astrophysics

22

Flow Velocity, Formyl Ions, Gas Ionization, Interstellar Gas, Interstellar Masers, Molecular Flow, Carbon Monoxide, Cepheus Constellation, Line Spectra, Stellar Winds, Water Masers

Scientific paper

Observations of the high-velocity (FWZP of about 44km/s) HCO(+) source in the J = 1-0 and J = 3-2 transitions toward Cep A are presented. The line frequency, beam size, and antenna efficiency for the observations are given in a table. A statistical analysis of the intensity ratio in HCO(+) and 13-CO(+) lines showed that the emission originates from high-density clumps of about 10 to the 6th per cu cm within a high-velocity outflow. The highest HCO(+) emission was confined to an unresolved region near the IR cluster and H2O masers. At intermediate velocities the HCO(+) emission was spatially extended with redshifted and blueshifted lobes on opposite sides of the dense core. It is shown that the HCO(+) abundance of 3-6 x 10 to the -9th, and the electron abundance of up to 10 to the -8th in the high velocity flow are similar to those observed in more quiescent molecular clouds. The spatial distribution of the integrated blueshifted and redshifted HCO(+) emission in Cep A is illustrated in a series of contour maps.

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