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    A sample of radio-loud QSOs at redshift ~ 4

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    A sample of radio.pdf (268.3Kb)
    Identificadores
    URI: http://hdl.handle.net/10902/1893
    DOI: 10.1111/j.1365-2966.2004.07423.x
    ISSN: 1365-2966
    ISSN: 0035-8711
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    Author
    Holt, Joanna; Benn, Chris R.; Vigotti, Mario; Pedani, Marco; Carballo Fidalgo, Ruth; González Serrano, José Ignacio; Mack, Karl Heinz; García Lorenzo, Begoña
    Date
    2004-03
    Derechos
    © 2004 RAS
    Publicado en
    Monthly Notices of the Royal Astronomical Society, 2004, 348(3), 857-865
    Publisher
    Royal Astronomical Society
    Enlace a la publicación
    http://dx.doi.org/10.1111/j.1365-2966.2004.07423.x
    Palabras clave
    Quasars: emission lines
    Quasars: general
    Early Universe
    Radio continuum: galaxies
    Abstract:
    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).
    Collections to which it belong
    • D20 Artículos [302]
    • D52 Artículos [505]

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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España