Effect of strong gravity on the optical appearance of rapidly fluctuating astronomical sources

Details Effect of strong gravity on the optical appearance of rapidly fluctuating astronomical sources Effect of strong gravity on the optical appearance of rapidly fluctuating astronomical sources

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..501m&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Dec. 1, 1978, p. 501-507.

Astronomy and Astrophysics

Astronomy

4

Black Holes (Astronomy), Gravitational Effects, Light Curve, Light Emission, Relativistic Effects, Astronomical Models, Delta Function, Galactic Nuclei, Gravitational Collapse, Luminous Intensity, Neutron Stars, Quasars, Red Shift, Schwarzschild Metric

Scientific paper

We calculate the light curve observed at infinity when an isotropic 'flash' of light is emitted from a stationary surface or shell embedded in a Schwarzschild geometry. If the intrinsic flash time interval is much less than the time of flight of a photon across the source radius, then the observed light curve will be independent of the details of the intrinsic pulse and will depend only on the central mass, surface radius, and obliquity factor. The resulting light curves are found to exhibit secondary peaks of amplitude about 1% main peak when the redshift z is greater than 0.62. Approximate formulas are given which allow the source mass and surface radius to be extracted from the observed light curve. The effect of strong gravity on the deduced size limits of fluctuating sources is considered, and it is found that the size limit inequality is only weakly dependent on redshift, in contradiction to the often-quoted (1 + z) dependency.

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