Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178p..23p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 23P-25P.
Astronomy and Astrophysics
Astronomy
14
Balloon-Borne Instruments, Seyfert Galaxies, X Ray Astronomy, X Ray Sources, X Ray Spectra, Bremsstrahlung, Photon Density, Spectral Energy Distribution, Spectrum Analysis, X Ray Telescopes
Scientific paper
3U 1207+39, the X-ray source identified with the Seyfert galaxy NGC
4151, was observed on June 24, 1975, with a balloon-borne telescope. The
photon number spectrum was relatively flat (power-law slope of about
-1.6) and consistent with previous observations. Thermal-bremsstrahlung
models provide poorer fits to the data.
Mushotzky Richard F.
Paciesas William Simon
Pelling Michael R.
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