Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefc10i&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Astronomy and Astrophysics
Astronomy
Astronomical Species And Processes
Scientific paper
It has long been theorized that supernova remnants (SNR) accelerate the majority of Galactic cosmic rays. Observations in the γ-ray, X-ray, and radio regimes support this theory, at least for cosmic rays with energies above a few GeV. However, there is no direct evidence that SNRs accelerate cosmic rays in the MeV--GeV range. These low-energy cosmic rays are of great importance, as they are the primary means by which H_2 is ionized in the interstellar medium. Collisions between H_2^+ and H_2 will rapidly form H_3^+, a molecule which can then be observed to infer the ionization rate of H_2. Using the Subaru and Keck telescopes, we have searched for H_3^+ absorption in sight lines which probe molecular material known to be interacting with the SNR IC 443. By computing the ionization rate of H_2 in these sight lines, we constrain the flux of low-energy cosmic rays generated by this particular supernova remnant.
Blake Geoffrey A.
Geballe Thomas Ronald
Goto Miwa
Indriolo Nick
McCall Benjamin J.
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