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BHSKY: Visual distortions near a black hole
Robert J. Nemiroff
Michigan Technological University
Abstract:
BHSKY (copyright 1999 by Robert J. Nemiroff) computes the visual
distortion effects visible to an observer traveling around
and descending near a non-rotating black hole.
The codes are general relativistically accurate and incorporate
concepts such as large-angle deflections, image magnifications,
multiple imaging,
blue-shifting, and the location of the photon sphere. Once
star.dat is edited to define the position and orientation
of the observer relative to the black hole, bhsky_table
should be run to create a table of photon deflection angles.
Next bhsky_image reads this table and recomputes the
perceived positions of stars in star.num, the Yale Bright Star
Catalog. Lastly, bhsky_camera plots these results.
The code currently tracks only the two brightest images of
each star, and hence becomes noticeably incomplete within
1.1 times the Schwarzschild radius.
Subject headings: black hole physics -- gravitational lensing -- relativity
Latest Version: 1999 October 12
Archived: 1999 October 13
Paper:
Nemiroff, R. J., 1993AmJPh..61..619N
Languages: Fortran 77,
IDL
External Explanatory Pages:
http://antwrp.gsfc.nasa.gov/htmltest/rjn_bht.html
Source Codes:
bhsky_table.for,
bhsky_image.for,
bhsky_camera.pro,
star.num,
star.dat