A FIRST–APM–SDSS survey for high-redshift radio QSOs

We selected from the VLA FIRST survey a sample of 94 objects with star-like counterparts in the Sloan Digital Sky Survey (SDSS), and with APM POSS-I colour O−E≥ 2, i.e. consistent with their being high-redshift quasars. 78 of the 94 candidates can be classified spectroscopically on the basis of eith...

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Autores: Carballo, R., González-Serrano, José Ignacio, Montenegro-Montes, F. M., Benn, Chris, Mack, K. H., Pedani, M., Vigotti, M.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/384537
Acceso en línea:http://hdl.handle.net/10261/384537
Access Level:acceso abierto
Palabra clave:Surveys
Quasars: general
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spelling A FIRST–APM–SDSS survey for high-redshift radio QSOsCarballo, R.González-Serrano, José IgnacioMontenegro-Montes, F. M.Benn, ChrisMack, K. H.Pedani, M.Vigotti, M.SurveysQuasars: generalWe selected from the VLA FIRST survey a sample of 94 objects with star-like counterparts in the Sloan Digital Sky Survey (SDSS), and with APM POSS-I colour O−E≥ 2, i.e. consistent with their being high-redshift quasars. 78 of the 94 candidates can be classified spectroscopically on the basis of either published data (mainly SDSS) or the observations presented here. The fractions of QSOs (51 out of 78) and redshift z > 3 QSOs (23 out of 78, 29 per cent) are comparable to those found in other photometric searches for high-redshift QSOs. We confirm that selecting colour O−E≥ 2 ensures inclusion of all QSOs with 3.7 ≤z≤ 4.4. The fraction of 2 ≤z≤ 4.4 QSOs with broad absorption lines (BALs) is 27 ± 10 per cent (7/26) and the estimated BAL fraction for radio-loud QSOs is at least as high as for optically selected QSOs (∼13 per cent). Both the high BAL fraction and the high fraction of low-ionization BALs among BALs (four to five out of seven) in our sample, compared to previous work, are likely due to the red colour selection O−E≥ 2. The space density of radio-loud QSOs in the range formula with MAB(1450) ≤−26.6 and P≥ 1025.7 W Hz−1 is 1.7 ± 0.6 Gpc−3. Adopting a radio-loud fraction of 13.4 ± 3 per cent, this corresponds to ρ= 12.5 ± 5.6 Gpc−3, in substantial agreement with the cumulative luminosity function of SDSS QSOs in Fan et al. We note the unusual flat-spectrum radio-luminous QSO FIRST 1413+4505 (z= 3.11), which shows strong associated Lyα absorption (rest-frame equivalent width ∼40 Å) and an extreme observed luminosity, L∼ 2 × 1015 L⊙.MV acknowledge financial support from the Spanish Ministerio de Educación y Ciencia under project AYA 2002−03326. Funding for the creation and distribution of the SDSS Archive has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the US Department of Energy, the Japanese Monbukagakusho and the Max Planck Society. Funding is provided primarily by NASA and the NSF.Peer reviewedOxford University PressNASANational Science Foundation (US)Alfred P. Sloan FoundationMinisterio de Educación y Ciencia (España)Department of Energy (US)Max Planck SocietyConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252006info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/384537reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1111/j.1365-2966.2006.10543.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3845372026-05-22T06:33:51Z
dc.title.none.fl_str_mv A FIRST–APM–SDSS survey for high-redshift radio QSOs
title A FIRST–APM–SDSS survey for high-redshift radio QSOs
spellingShingle A FIRST–APM–SDSS survey for high-redshift radio QSOs
Carballo, R.
Surveys
Quasars: general
title_short A FIRST–APM–SDSS survey for high-redshift radio QSOs
title_full A FIRST–APM–SDSS survey for high-redshift radio QSOs
title_fullStr A FIRST–APM–SDSS survey for high-redshift radio QSOs
title_full_unstemmed A FIRST–APM–SDSS survey for high-redshift radio QSOs
title_sort A FIRST–APM–SDSS survey for high-redshift radio QSOs
dc.creator.none.fl_str_mv Carballo, R.
González-Serrano, José Ignacio
Montenegro-Montes, F. M.
Benn, Chris
Mack, K. H.
Pedani, M.
Vigotti, M.
author Carballo, R.
author_facet Carballo, R.
González-Serrano, José Ignacio
Montenegro-Montes, F. M.
Benn, Chris
Mack, K. H.
Pedani, M.
Vigotti, M.
author_role author
author2 González-Serrano, José Ignacio
Montenegro-Montes, F. M.
Benn, Chris
Mack, K. H.
Pedani, M.
Vigotti, M.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv NASA
National Science Foundation (US)
Alfred P. Sloan Foundation
Ministerio de Educación y Ciencia (España)
Department of Energy (US)
Max Planck Society
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Surveys
Quasars: general
topic Surveys
Quasars: general
description We selected from the VLA FIRST survey a sample of 94 objects with star-like counterparts in the Sloan Digital Sky Survey (SDSS), and with APM POSS-I colour O−E≥ 2, i.e. consistent with their being high-redshift quasars. 78 of the 94 candidates can be classified spectroscopically on the basis of either published data (mainly SDSS) or the observations presented here. The fractions of QSOs (51 out of 78) and redshift z > 3 QSOs (23 out of 78, 29 per cent) are comparable to those found in other photometric searches for high-redshift QSOs. We confirm that selecting colour O−E≥ 2 ensures inclusion of all QSOs with 3.7 ≤z≤ 4.4. The fraction of 2 ≤z≤ 4.4 QSOs with broad absorption lines (BALs) is 27 ± 10 per cent (7/26) and the estimated BAL fraction for radio-loud QSOs is at least as high as for optically selected QSOs (∼13 per cent). Both the high BAL fraction and the high fraction of low-ionization BALs among BALs (four to five out of seven) in our sample, compared to previous work, are likely due to the red colour selection O−E≥ 2. The space density of radio-loud QSOs in the range formula with MAB(1450) ≤−26.6 and P≥ 1025.7 W Hz−1 is 1.7 ± 0.6 Gpc−3. Adopting a radio-loud fraction of 13.4 ± 3 per cent, this corresponds to ρ= 12.5 ± 5.6 Gpc−3, in substantial agreement with the cumulative luminosity function of SDSS QSOs in Fan et al. We note the unusual flat-spectrum radio-luminous QSO FIRST 1413+4505 (z= 3.11), which shows strong associated Lyα absorption (rest-frame equivalent width ∼40 Å) and an extreme observed luminosity, L∼ 2 × 1015 L⊙.
publishDate 2006
dc.date.none.fl_str_mv 2006
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/384537
url http://hdl.handle.net/10261/384537
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1111/j.1365-2966.2006.10543.x
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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