Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l...1s&link_type=abstract
Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L1-L4
Astronomy and Astrophysics
Astronomy
24
Blazars, Extinction, Gamma Ray Astronomy, Gamma Rays, Hubble Constant, Infrared Radiation, Pair Production, Quasars, Red Shift, Universe, Estimating, Gamma Ray Spectra, Infrared Spectra, Luminous Intensity
Scientific paper
The present uncertainty in the Hubble constant leaves unresolved questions regarding the age of the universe and related matters involving the amount and nature of the dark matter in the universe, consistency with the inflationary model of the universe, and the need for a cosmological constant. It is clear that a significantly precise determination of the Hubble constant by as many different methods as possible is crucial to our knowledge and understanding of the character of the universe. We propose here an entirely new method for determining the Hubble constant, based on measuring the extinction of high-energy gamma-rays emitted by detectable gamma-ray emitting blazars at various redshifts.
de Jager Ocker C.
Salamon Michael H.
Stecker Floyd W.
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