The evolution of QSO spectra
| dc.contributor.author | Francis, Paul | |
| dc.contributor.author | Koratkar, Anuradha | |
| dc.date.accessioned | 2018-09-10T01:59:35Z | |
| dc.date.available | 2018-09-10T01:59:35Z | |
| dc.date.issued | 1995 | |
| dc.description.abstract | We study the rest-frame UV spectra of two samples of QSOs, a low-redshift (z~0.4) sample drawn from the IUE archives, and a high-redshift (z~2.2), optically selected sample, the Large Bright QSO Survey (LBQS). The samples overlap substantially in their range of absolute magnitudes and radio properties, allowing us to study directly the evolution of QSO spectra between redshift z~2 and the present. We find strong evidence for spectral evolution of QSOs. At high redshifts only, we see a new population of radio-quiet QSOs with unusually compact broad-emission-line regions. No significant evolution is seen in the spectra of radio-loud QSOs. We also find that NV (124.0-nm) emission is weaker in radio-loud QSOs, and that the Baldwin effect is stronger in the red wing of CIV than in the blue. | en_AU |
| dc.description.sponsorship | PJF is supported by an ARC grant. | en_AU |
| dc.format.mimetype | application/pdf | en_AU |
| dc.identifier.issn | 0035-8711 | en_AU |
| dc.identifier.uri | http://hdl.handle.net/1885/147258 | |
| dc.publisher | Oxford University Press | en_AU |
| dc.rights | http://www.sherpa.ac.uk/romeo/issn/0035-8711/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 10/09/18) | en_AU |
| dc.source | Monthly Notices of the Royal Astronomical Society | en_AU |
| dc.title | The evolution of QSO spectra | en_AU |
| dc.type | Journal article | en_AU |
| dcterms.accessRights | Open Access | en_AU |
| local.bibliographicCitation.issue | 2 | en_AU |
| local.bibliographicCitation.lastpage | 518 | en_AU |
| local.bibliographicCitation.startpage | 504 | en_AU |
| local.contributor.affiliation | Francis, P., Mount Stromlo Observatory, Research School of Astronomy and Astrophysics, The Australian National University | en_AU |
| local.contributor.authoruid | u9710753 | en_AU |
| local.description.notes | The author was affiliated with University of Melbourne when the paper was published. | en_AU |
| local.identifier.citationvolume | 274 | en_AU |
| local.identifier.doi | 10.1093/mnras/274.2.504 | en_AU |
| local.publisher.url | https://academic.oup.com/journals/ | en_AU |
| local.type.status | Published Version | en_AU |