Decameter observations of the nebulae IC 405 and IC 410

Details Decameter observations of the nebulae IC 405 and IC 410 Decameter observations of the nebulae IC 405 and IC 410

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983azh....60...53a&link_type=abstract

(Astronomicheskii Zhurnal, vol. 60, Jan.-Feb. 1983, p. 53-56) Soviet Astronomy (ISSN 0038-5301), vol. 27, Jan.-Feb. 1983, p. 32-

Astronomy and Astrophysics

Astronomy

Decametric Waves, Nebulae, Radio Astronomy, Absorption Spectra, Brightness Distribution, Electron Density (Concentration), Electron Energy, H Ii Regions, Nonthermal Radiation, Radiation Distribution, Spectral Resolution

Scientific paper

Results are presented of absorption measurements of the H II regions IC 405 and IC 410 obtained at five freequencies between 12.6 and 25 MHz with 0.5-1.0 deg resolution using the UTR-2 radio telescope. The average nonthermal radiation density of the interstellar medium at 12.6 MHz toward IC 405 is determined to be 135 K/pc, whereas it is found to be 37 K/pc toward IC 410. It is found that the kinetic temperature of IC 410 is 11,000 K and that the electron density is approximately 12/cu cm. Calculations are presented for several other physical parameters toward the center of IC 410: optical depth at 25 MHz = 8, emission measure = 8,000 pc/cm exp 6, and mass = 3400 solar masses.

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