A sample of radio-loud QSOs at redshift ∼ 4

We obtained spectra of 60 red, star-like objects (E < 18.8) identified with FIRST radio sources, S1.4 GHz > 1 mJy. Eight are quasi-stellar objects (QSOs) with redshift z > 3.6. Combined with our earlier pilot search, our sample of 121 candidates yields a total of 18 z > 3.6 QSOs (10 of t...

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Authors: Holt, J., Benn, Chris, Vigotti, M., Carballo, R., González-Serrano, José Ignacio, Mack, K. H., García-Lorenzo, Begoña
Format: article
Status:Published version
Publication Date:2004
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/384790
Online Access:http://hdl.handle.net/10261/384790
Access Level:Open access
Keyword:Quasars: emission lines
Quasars: general
Radio continuum: galaxies
Early Universe
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spelling A sample of radio-loud QSOs at redshift ∼ 4Holt, J.Benn, ChrisVigotti, M.Carballo, R.González-Serrano, José IgnacioMack, K. H.García-Lorenzo, BegoñaQuasars: emission linesQuasars: generalRadio continuum: galaxiesEarly UniverseWe obtained spectra of 60 red, star-like objects (E < 18.8) identified with FIRST radio sources, S1.4 GHz > 1 mJy. Eight are quasi-stellar objects (QSOs) with redshift z > 3.6. Combined with our earlier pilot search, our sample of 121 candidates yields a total of 18 z > 3.6 QSOs (10 of these with z > 4.0). 8 per cent of candidates with S1.4 GHz< 10 mJy and 37 per cent of candidates with S1.4 GHz> 10 mJy are QSOs with z > 3.6. The surface density of E < 18.8, S1.4 GHz > 1 mJy, z > 4 QSOs is 0.003 deg−2. This is currently the only well-defined sample of radio-loud QSOs at z≈ 4 selected independently of radio spectral index. The QSOs are highly luminous in the optical (eight have MB < −28, q0= 0.5, H0= 50 km s−1 Mpc−1). The SEDs are as varied as those seen in optical searches for high-redshift QSOs, but the fraction of objects with weak (strongly self-absorbed) Lyα emission is marginally higher (3 out of 18) than for high-redshift QSOs from SDSS (5 out of 96).RC and JIGS acknowledge financial support from DGES project PB98-0409-C02-02. CRB, MV, RC and JIGS acknowledge financial support from the Spanish Ministerio de Ciencia y Tecnologia under project AYA2002-03326. KHM was supported through a European Community Marie Curie fellowship.Peer reviewedOxford University PressNASAMinisterio de Ciencia y Tecnología (España)Dirección General de Enseñanza Superior e Investigación Científica (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252004info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/384790reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1111/j.1365-2966.2004.07423.xSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3847902026-05-22T06:33:51Z
dc.title.none.fl_str_mv A sample of radio-loud QSOs at redshift ∼ 4
title A sample of radio-loud QSOs at redshift ∼ 4
spellingShingle A sample of radio-loud QSOs at redshift ∼ 4
Holt, J.
Quasars: emission lines
Quasars: general
Radio continuum: galaxies
Early Universe
title_short A sample of radio-loud QSOs at redshift ∼ 4
title_full A sample of radio-loud QSOs at redshift ∼ 4
title_fullStr A sample of radio-loud QSOs at redshift ∼ 4
title_full_unstemmed A sample of radio-loud QSOs at redshift ∼ 4
title_sort A sample of radio-loud QSOs at redshift ∼ 4
dc.creator.none.fl_str_mv Holt, J.
Benn, Chris
Vigotti, M.
Carballo, R.
González-Serrano, José Ignacio
Mack, K. H.
García-Lorenzo, Begoña
author Holt, J.
author_facet Holt, J.
Benn, Chris
Vigotti, M.
Carballo, R.
González-Serrano, José Ignacio
Mack, K. H.
García-Lorenzo, Begoña
author_role author
author2 Benn, Chris
Vigotti, M.
Carballo, R.
González-Serrano, José Ignacio
Mack, K. H.
García-Lorenzo, Begoña
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv NASA
Ministerio de Ciencia y Tecnología (España)
Dirección General de Enseñanza Superior e Investigación Científica (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Quasars: emission lines
Quasars: general
Radio continuum: galaxies
Early Universe
topic Quasars: emission lines
Quasars: general
Radio continuum: galaxies
Early Universe
description We obtained spectra of 60 red, star-like objects (E < 18.8) identified with FIRST radio sources, S1.4 GHz > 1 mJy. Eight are quasi-stellar objects (QSOs) with redshift z > 3.6. Combined with our earlier pilot search, our sample of 121 candidates yields a total of 18 z > 3.6 QSOs (10 of these with z > 4.0). 8 per cent of candidates with S1.4 GHz< 10 mJy and 37 per cent of candidates with S1.4 GHz> 10 mJy are QSOs with z > 3.6. The surface density of E < 18.8, S1.4 GHz > 1 mJy, z > 4 QSOs is 0.003 deg−2. This is currently the only well-defined sample of radio-loud QSOs at z≈ 4 selected independently of radio spectral index. The QSOs are highly luminous in the optical (eight have MB < −28, q0= 0.5, H0= 50 km s−1 Mpc−1). The SEDs are as varied as those seen in optical searches for high-redshift QSOs, but the fraction of objects with weak (strongly self-absorbed) Lyα emission is marginally higher (3 out of 18) than for high-redshift QSOs from SDSS (5 out of 96).
publishDate 2004
dc.date.none.fl_str_mv 2004
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/10261/384790
url http://hdl.handle.net/10261/384790
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1111/j.1365-2966.2004.07423.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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