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Books > Science & Mathematics > Physics > Relativity physics
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Gravitational Lenses (Paperback, Softcover reprint of the original 1st ed. 1992)
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Gravitational Lenses (Paperback, Softcover reprint of the original 1st ed. 1992)
Series: Astronomy and Astrophysics Library
Expected to ship within 10 - 15 working days
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The theory, observations, and applications ofgravitational
lensingconstitute one ofthe most rapidly growing branches
ofextragalactic astrophysics. The deflection of light from very
distant sources by intervening masses provides a unique possibility
for the investigation of both background sources and lens mass
distributions. Gravitational lensing manifestsitselfmost distinctly
through multiply imaged QSOs and the formation of highly elongated
im ages of distant galaxies ('arcs') and spectacular ring-like
images of extra galactic radio sources. But the effects of
gravitational light deflection are not limited to these prominent
image configurations; more subtle, since not directly observable,
consequences of lensing are the, possibly strong, mag nification of
sources, which may permit observation of intrinsically fainter, or
more distant, sources than would be visible without these natural
tele scopes. Such light deflection can also affect the source
counts of QSOs and of other compact extragalactic sources, and can
lead to flux variability of sources owing to propagation effects.
Trying to summarizethe theory and observationalstatus
ofgravitational lensing in a monograph turned out to be a bigger
problem than any of the authors anticipated when we started this
project at the end of 1987, encour aged by Martin Harwit, who
originally approached us. The development in the field has been
very rapid during the last four years, both through the ory and
through observation, and many sections have been rewritten several
times, as the previous versions became out of date.
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