Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..33r&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #33
Astronomy and Astrophysics
Astrophysics
Scientific paper
Currently the carbon radio recombination lines are observed with the numbers 202-209, 222-229, 330, 570-580, 631-686, 732 and 864- 868 towards Cassiopeia A. The broadening of the lines with the numbers 202-300 is determined by the Doppler effect. The lines with the numbers above 300 are broadened by the highly excited carbon interaction with the non-thermal background radiation. For the lines with the numbers above 600 the broadening due to electron collisions dominates, since the cross-section of the carbon interaction with electrons is very large. Using the magnitude of the collisional width for some low-frequency lines the medium density is accepted to be experimentally found towards Cassiopeia A. Allowing for the series of the impact approximation theory and quadrupole interaction potential, the line collisional widths are found with the theoretical error less than 0.06 in the range of the CII region low temperatures. To determine the medium density by using the experimental values of the line widths, the Doppler, radiational and impact broadening are calculated for the lines with the principal quantum numbers n> 600.
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