| 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 |
|