Soft X-ray spectroscopy of three extragalactic sources

Details Soft X-ray spectroscopy of three extragalactic sources Soft X-ray spectroscopy of three extragalactic sources

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197...25m&link_type=abstract

Astrophysical Journal, vol. 197, Apr. 1, 1975, pt. 1, p. 25-29.

Computer Science

Sound

38

Electromagnetic Absorption, Galactic Clusters, Quasars, Seyfert Galaxies, X Ray Astronomy, Energy Spectra, Error Analysis, Extragalactic Radio Sources, Luminous Intensity, Proportional Counters, Rocket Sounding, Spectral Line Width, Spectrum Analysis, X Ray Spectra

Scientific paper

Soft X-ray spectra (0.5 to 5 KeV) acquired with a rocket-borne argon-methane proportional counter are reported for M87, 3C 273, and NGC 4151. The counter sensitivity range allowed derivation of simultaneous information on the magnitude of soft X-ray absorption and the slope of the hard X-ray spectrum. Error estimation techniques for the free parameters of X-ray spectra are analyzed, and the results are applied to the spectra previously reported for these sources. It is shown that the technique used to analyze the previous spectra can drastically underestimate the magnitude of errors, and it is concluded that the proposed division of extragalactic X-ray sources into two groups according to the magnitude of absorption in their spectra is premature.

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