| dc.contributor.author | Sánchez, S.F. | |
| dc.contributor.author | González Serrano, José Ignacio | |
| dc.contributor.other | Universidad de Cantabria | es_ES |
| dc.date.accessioned | 2023-02-27T13:52:29Z | |
| dc.date.available | 2023-02-27T13:52:29Z | |
| dc.date.issued | 1999 | |
| dc.identifier.issn | 0004-6361 | |
| dc.identifier.issn | 1432-0746 | |
| dc.identifier.other | PB92 0501 | es_ES |
| dc.identifier.other | PB95 0122 | es_ES |
| dc.identifier.uri | https://hdl.handle.net/10902/27912 | |
| dc.description.abstract | We have conducted an optical study of the environments of seven radio-loud quasars at redshifts 1<z<1.6. In this paper we describe deep B and R band images obtained for fields of ~ 6x6 arcmin around these quasars with 3sigma limiting magnitudes of B ~ 26 and R ~ 25.4. We found an statistically significant excess of faint (B>22.5 and R>22.0) galaxies on scales of r<170'' and r<35'' around the quasars. The number of excess galaxies, their magnitudes and the angular extension of the excesses are compatible with clusters of galaxies at the redshift of the QSOs. We also found that the quasars of our sample are in general not located at the peak of the density distribution, lying in a projected distance of about ~ 70'' from it. This result agrees with the scenario of a link between overdensities of galaxies around radio sources and the origin of their radio emission. | es_ES |
| dc.description.sponsorship | Acknowledgements. The 2.2m telescope, at the Centro Astronomico ´ Hispano-Aleman, Calar Alto, is operated by the Max-Planck-Institute for Astronomy, Heidelberg, jointly with the Spanish Comision Nacional de Astronomıa. We also thank S. Charlot for providing us with the GISSEL package, and L. Cayon and I. Ferreras for their help in obtaining the k + e and evolutionary corrections from the GISSEL models for the used filters. We thank E. Martınez-Gonzalez for the useful comments about the derivation of the number-counts variance, and I. Ferreras for comments about the luminosity of the galaxies. We also thank the referee for the useful comments. Financial support was provided under DGICYT project PB92 0501, DGES project PB95 0122, and by the Comision Mixta Caja Cantabria - Universidad de ´ Cantabria. S.F. Sanchez wants to thank the FPU/FPI program of the Spanish MEC for provide him a PhD student fellowship. | es_ES |
| dc.format.extent | 12 p. | es_ES |
| dc.language.iso | eng | es_ES |
| dc.publisher | EDP Sciences | es_ES |
| dc.rights | © ESO 1999 | es_ES |
| dc.source | Astronomy and Astrophysics, 1999, 352 (2), 382-394 | es_ES |
| dc.subject.other | Galaxies: clusters: general | es_ES |
| dc.subject.other | Galaxies: quasars: general | es_ES |
| dc.title | Excesses of faint galaxies around seven radio QSOs at 1.0<z<1.6. Clustering at high-z | es_ES |
| dc.type | info:eu-repo/semantics/article | es_ES |
| dc.rights.accessRights | openAccess | es_ES |
| dc.type.version | publishedVersion | es_ES |
