المستودع الأكاديمي جامعة المدينة

Cluster of galaxies around seven radio-loud QSOs at 1<z<1.6: K-band images

أعرض تسجيلة المادة بشكل مبسط

dc.creator Sánchez, Sebastián F.
dc.creator González-Serrano, José Ignacio
dc.date 2008-05-04T18:42:22Z
dc.date 2008-05-04T18:42:22Z
dc.date 2002-09-18
dc.date.accessioned 2017-01-31T01:09:22Z
dc.date.available 2017-01-31T01:09:22Z
dc.identifier arXiv:astro-ph/0209355v1
dc.identifier Astron. Astrophys. 396 (2002) 773-786
dc.identifier 0004-6361
dc.identifier http://hdl.handle.net/10261/3977
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3977
dc.description 15 pages. Accepted for publishing in A&A.
dc.description We have conducted a NIR study of the environments of seven radio-loud quasars at redshifts 1<z<1.6. In present paper we describe deep $K$ band images obtained for the fields of ~6X6 arcmin around the quasars with 3$\sigma$ limiting magnitudes of K~20.5. These fields were previously studied using deep B and R band images (Sanchez & Gonzalez-Serrano 1999). Using together optical and NIR data, it has been found a significant excess of galaxies which optical-NIR colours, luminosity, spatial scale, and number of galaxies are compatible with clusters at the redshift of the quasar.
dc.description We have selected a sample of cluster candidates analyzing the R-K vs. K diagram. A ~25% of the candidates present red optical-NIR colours and an ultraviolet excess. This population has been also found in clusters around quasars at the same redshifts (Tanaka et al. 2000; Haines et al. 2001). These galaxies seem to follow a mixed evolution: a main passive evolution plus late starformation processes. The quasars do not inhabit the core of the clusters, being found in the outer regions. This result agrees with the hypothesis that the origin/feeding mechanism of the nuclear activity were merging processes. The quasars inhabit the region were a collision is most probably to produce a merger.
dc.description J.I. González-Serrano wants to aknowledge financial support from DGESIC (Ministerio de Educacion y Cultura) under project PB98-0409-C02-02.
dc.description Peer reviewed
dc.format 730840 bytes
dc.format application/pdf
dc.language eng
dc.publisher EDP Sciences
dc.relation Preprint
dc.rights openAccess
dc.subject Galaxies: clusters: general
dc.subject Quasars: general
dc.subject Astrophysics
dc.title Cluster of galaxies around seven radio-loud QSOs at 1<z<1.6: K-band images
dc.type Pre-print


الملفات في هذه المادة

الملفات الحجم الصيغة عرض

لا توجد أي ملفات مرتبطة بهذه المادة.

هذه المادة تبدو في المجموعات التالية:

أعرض تسجيلة المادة بشكل مبسط