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Titolo:
Statistical lensing by galactic discs
Autore:
Blain, AW; Moller, O; Maller, AH;
Indirizzi:
Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England Univ Cambridge Cambridge England CB3 0HE Lab, Cambridge CB3 0HE, England Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 s, Santa Cruz, CA 95064 USA
Titolo Testata:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 2, volume: 303, anno: 1999,
pagine: 423 - 432
SICI:
0035-8711(19990221)303:2<423:SLBGD>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
GRAVITATIONAL LENSES; MILLIMETRE/SUBMILLIMETRE WAVEBAND; GALAXIES; CLUSTERS;
Keywords:
galaxies : evolution; galaxies : fundamental parameters; cosmology : theory; gravitational lensing; radio continuum : galaxies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Blain, AW Univ Cambridge, Cavendish Lab, Madingley Rd, Cambridge CB3 0HE, England Univ Cambridge Madingley Rd Cambridge England CB3 0HE , England
Citazione:
A.W. Blain et al., "Statistical lensing by galactic discs", M NOT R AST, 303(2), 1999, pp. 423-432

Abstract

The high-magnification gravitational lensing cross-section of a galaxy is enhanced significantly if a baryonic disc is embedded in its dark matter halo. We investigate the effects of a population of such discs on the probability of detecting strongly lensed images of distant galaxies and quasars. The optical depth to lensing is always more than doubled. The effects are particularly significant at magnifications greater than about 50, for which the optical depth typically increases by a factor greater than 5. If either the fraction of discs or the typical disc-to-halo mass ratio increases withredshift, then the optical depth is expected to be increased even further. Obscuration by dust in the lensing disc is expected to counteract the associated enhanced magnification bias for surveys in the optical waveband, butnot in the radio and millimetre/submillimetre wavebands. The presence of galactic discs should hence lead to a significant increase in the number of lensed galaxies and quasars detected in both radio- and millimetre/submillimetre-selected surveys. An increase by a factor of about 3 is expected, enhancing the strong case for millimetre/submillimetre-wave lens surveys usingthe next generation of ground-based telescopes and the FIRST and Planck Surveyor space missions.

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Documento generato il 24/06/18 alle ore 16:59:45