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| DC Field | Value | Language |
|---|---|---|
| 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 | - |
| Appears in Collections: | Digital Csic | |
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