Ground-based searches for interstellar H2D(+)

Details Ground-based searches for interstellar H2D(+) Ground-based searches for interstellar H2D(+)

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261l..13v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. L13-L16.

Astronomy and Astrophysics

Astrophysics

23

Deuterium, Hydrogen, Interstellar Matter, Molecular Ions, Abundance, Astronomical Observatories, Molecular Excitation

Scientific paper

We present ground-based searches for the 110 - 111 line of interstellar H2D(+) at 372 GHz which are more sensitive than those obtained from the Kuiper Airborne Observatory by factors of 3-4 for extended sources and by more than two orders of magnitude for compact sources. The line was not detected in a variety of interstellar clouds, including NGC 2264 toward which a possible detection had been suggested previously. The inferred H2D(+) abundance limits of 10 exp -10 - 10 exp -11 are still consistent with, but approach the abundances predicted by chemical models. Simultaneous observations of the DCO(+) 3-2 and N2H(+) 4-3 lines have been used to place additional limits on the H3(+) abundance, and suggest x(H3(+) in the range of 10- exp -11 to 10 exp 9. The N2H(+) data also indicate that for NGC 2264, but perhaps not for the other sources, gas-phase N2 contains a substantial fraction of the available nitrogen in the cloud.

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