Evidence for 200 second variability in the X-ray flux of the quasar 1525 + 227

Details Evidence for 200 second variability in the X-ray flux of the quasar 1525 + 227 Evidence for 200 second variability in the X-ray flux of the quasar 1525 + 227

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258l...1m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 258, July 1, 1982, p. L1-L5.

Astronomy and Astrophysics

Astronomy

43

Flux (Rate), Quasars, Relativistic Particles, Variability, X Ray Sources, Anisotropy, Heao 2, Hubble Constant, Proportional Counters, Spaceborne Astronomy, Statistical Analysis

Scientific paper

Sixteen hundred seconds of Einstein Observatory IPC data for 1525 + 227, a bright, nearby quasar show significant intensity fluctuations on a time scale of 200 seconds. Similar fluctuations were not detected 13 months later during a follow-up 12,500 second observation. Interpretation of the time variations requires a Hubble constant equal to or greater than 100 km/s per Mpc to obtain even marginal consistency with standard isotropic emission models. An alternative interpretation invokes anisotropic emission probably due to the presence of relativistic motions with associated beaming effects.

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