Computer Science – Numerical Analysis
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424l..17f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 1, p. L17-L20
Computer Science
Numerical Analysis
2
Attenuation, Gravitational Fields, Gravitational Lenses, Light Sources, Numerical Analysis, Quasars, Mean Free Path, Red Shift, Space Density, Stellar Luminosity
Scientific paper
We investigated the change of luminosity of distant galaxies due to multiple gravitational lensing. We obtained the luminosity change by calculating the orbits of photons in a model universe in which lensing objects are uniformly distributed. We found that luminosities of galaxies are, in most cases, attenuated by multiple gravitational lensing. There are a few galaxies whose luminosity is amplified through multiple lensing. The number of attenuated galaxies is much larger than that of amplified galaxies. We also found that the median value of attenuation ratio of the distant galaxies is well approximated by (1 + z)-1.3(Omegal1/2), where Omegal is the density parameter of lensing objects. This result shows that the gravitational lensing introduces an 'attenuation bias' into the luminosity function of distant galaxies and quasars.
Ebisuzaki Toshikazu
Funato Yoko
Makino Junichiro
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