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    A strongly star-forming group: three massive galaxies associated with a quasi-stellar object

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    URI: http://hdl.handle.net/10902/3974
    DOI: 10.1111/j.1365-2966.2011.18352.x
    ISSN: 0035-8711
    ISSN: 1365-2966
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    Author
    Carrera Troyano, Francisco JesúsAutoridad Unican; Page, Mathew J.; Stevens, Jason A.; Ivison, Rob J.; Dwelly, Tom; Ebrero Carrero, Jacobo; Falocco, Serena
    Date
    2011
    Derechos
    © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
    Publicado en
    Monthly Notices of the Royal Astronomical Society Vol. 413, Iss. 4, Pag. 2791-2807 (2011)
    Publisher
    Royal Astronomical Society
    Enlace a la publicación
    http://dx.doi.org/10.1111/j.1365-2966.2011.18352.x
    Palabras clave
    Galaxies: evolution
    Galaxies: formation
    Galaxies: high-redshift
    Galaxies: starburst
    Abstract:
    We present here photometric redshift confirmation of the presence of large-scale structure around the z= 1.82 quasi-stellar object (QSO) RX J0941, which shows an overdensity of submillimetre (submm) sources. Radio imaging confirms the presence of the submm sources and pinpoints their likely optical near-infrared (NIR) counterparts. Four of the five submm sources present in this field (including the QSO) have counterparts with redshifts compatible with z= 1.82. We show that our photometric redshifts are robust against the use of different spectral templates. We have measured the galaxy stellar mass of the submm galaxies from their rest-frame K-band luminosity obtaining log(M*/M⊙) ∼ 11.5 ± 0.2, slightly larger than the Schechter mass of present-day galaxies, and hence indicating that most of the stellar mass is already formed. We present optical-to-radio spectral energy distributions (SEDs) of the five Submillimetre Common-User Bolometer Array (SCUBA) sources. The emission of RX J0941 is dominated by reprocessed active galactic nucleus (AGN) emission in the observed mid-IR (MIR) range, while the starburst contribution completely dominates in the submm range. The SEDs of the other three counterparts are compatible with a dominant starburst contribution above ∼24 μm, with star formation rates ∼2000 M⊙ yr−1, central dust masses log(Mdust/M⊙) ∼ 9 ± 0.5 and hence central gas masses log(Mgas/M⊙) ∼ 10.7. There is very little room for an AGN contribution. From X-ray upper limits and the observed 24 μm flux, we derive a maximum 2–10 keV X-ray luminosity of 1044 erg s−1 for any putative AGN, even if they are heavily obscured. This in turn points to relatively small black holes with log(M•/M⊙) ≲ 8 and hence stellar-to-black hole mass ratios about 1 order of magnitude higher than those observed in the present Universe: most of their central black hole masses are still to be accreted. Local stellar-to-black hole mass ratios can be reached if ∼1.3 per cent of the available nuclear gas mass is accreted.
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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