An HCO(+) study of NGC 7538, IRS 9, and GL 490

Details An HCO(+) study of NGC 7538, IRS 9, and GL 490 An HCO(+) study of NGC 7538, IRS 9, and GL 490

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...441..665h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 441, no. 2, p. 665-679

Astronomy and Astrophysics

Astrophysics

17

Abundance, Formyl Ions, Gas Jets, Molecular Beams, Molecular Spectra, Radio Observation, Carbon Monoxide, Data Reduction, Density Distribution, Spectrum Analysis, Temperature Profiles

Scientific paper

We analyze spectra of the J = 4-3 and J = 3-2 transitions of HCO(+) and H(13)CO(+) in NGC 7358 IRS 9 and GL 490. The spectra show a narrow core and broad wings. We identify the narrow component with quiescent gas and the wings with the outflowing gas seen in CO in these sources. In both sources, the molecular hydrogen density for the narrow components is 106 to 108/cm. The gas density for the wing component is less well constrained but is at least about 1 x 105/cm. The abundance of HCO(+) relative to CO is estimated forthe wing and narrow components of the HCO(+) spectra in the two sources. The HCO(+) to CO ratio in the quiescent gas in the two sources is almost normal about 1 x 10-4, provided the gas is warm (about 30 K), but can be 50-100 times enhenced if the HCO(+) emission originates from hot gas (100-200 K). The estimates for the HCO(+) to CO ratio in the outflowing gas do not contradict normal values of order 1 x 10-4, although the results are dependent on gas temperature and source size. More complete observations and analyses are necessary before a substantially high or low abundance of HCO(+) for molecular outflows can be concluded.

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