أعرض تسجيلة المادة بشكل مبسط

dc.creator Benítez, Narciso
dc.creator Sanz, J. L.
dc.creator Martínez-González, Enrique
dc.date 2008-05-04T19:16:41Z
dc.date 2008-05-04T19:16:41Z
dc.date 2000-08-24
dc.date.accessioned 2017-01-31T01:09:26Z
dc.date.available 2017-01-31T01:09:26Z
dc.identifier arXiv:astro-ph/0008394v1
dc.identifier Mon. Not. Roy. Astron. Soc. 320 (2001) 241
dc.identifier 0035-8711
dc.identifier http://hdl.handle.net/10261/3980
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3980
dc.description 9 pages, 6 figures.-- MNRAS accepted.
dc.description Gravitational lensing predicts an enhancement of the density of bright, distant QSOs around foreground galaxies. We measure this QSO-galaxy correlation w_qg for two complete samples of radio-loud quasars, the southern 1Jy and Half-Jansky samples. The existence of a positive correlation between z~1 quasars and z~0.15 galaxies is confirmed at a p=99.0% significance level (>99.9%) if previous measurements on the northern hemisphere are included). A comparison with the results obtained for incomplete quasar catalogs (e.g. the Veron-Cetty and Veron compilation) suggests the existence of an `identification bias', which spuriously increases the estimated amplitude of the quasar-galaxy correlation for incomplete samples. This effect may explain many of the surprisingly strong quasar-galaxy associations found in the literature. Nevertheless, the value of w_qg that we measure in our complete catalogs is still considerably higher than the predictions from weak lensing. We consider two effects which could help to explain this discrepancy: galactic dust extinction and strong lensing.
dc.description Peer reviewed
dc.format 267551 bytes
dc.format application/pdf
dc.language eng
dc.publisher Blackwell Publishing
dc.relation Preprint
dc.rights openAccess
dc.subject Quasar galaxy associations
dc.subject Gravitational lensing
dc.title Quasar-galaxy associations revisited
dc.type Pre-print


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أعرض تسجيلة المادة بشكل مبسط