Molecules synthesized by cosmic rays in cometary nuclei - A tool to estimate their low-energy spectrum

Details Molecules synthesized by cosmic rays in cometary nuclei - A tool to estimate their low-energy spectrum Molecules synthesized by cosmic rays in cometary nuclei - A tool to estimate their low-energy spectrum

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..527p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 527-532. Research supported by MPI.

Astronomy and Astrophysics

Astrophysics

1

Comet Nuclei, Cosmic Rays, Energy Spectra, Interstellar Chemistry, Molecular Spectra, Radiation Chemistry, Comet Tails, Formaldehyde, Giotto Mission, Photochemical Reactions, Comets, Comet Nuclei, Molecules, Cosmic Rays, Spectra, Long-Period Comets, Chemistry, Irradiation, Formaldehyde, Photodissociation, Comae, Particles, Calculations, Bombardment, Ions, Parameters, Depth, Flux, Distance

Scientific paper

Chemical modifications induced by cosmic-ray irradiation in cometary nuclei are evaluated. The production of formaldehyde via this mechanism is estimated at various depths in the nucleus of a long-period comet (T about 1 million yr). The abundance of H2CO and of its photodissociation product HCO in the coma of such a comet when it approaches the sun is also computed and can be used to check observationally the validity of the low-energy cosmic-ray flux used in the calculations. In particular, on the basis of calculations and of observations of complex molecules, synthesized by particle bombardment, it will be possible to evaluate whether the so-called 'anomalous component' of cosmic rays has an interstellar origin or not.

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