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The ALHAMBRA survey: Discovery of a faint QSO at z = 5.41

AuthorsMatute, Israel; Masegosa, Josefa ; Márquez, Isabel ; Fernández-Soto, Alberto ; Husillos, César ; Olmo, Ascensión del ; Perea, Jaime ; Pović, Mirjana; Ascaso, Begoña ; Alfaro, Emilio J. ; Moles, Mariano ; Aguerri, J. A. L.; Aparicio Villegas, Teresa ; Benítez, Narciso ; Broadhurst, T.; Cabrera-Caño, Jesús; Castander, Francisco J. ; Cepa, Jordi; Cerviño, Miguel ; Cristóbal-Hornillos, David ; Infante, Leopoldo; González Delgado, Rosa M. ; Martínez, Vicente J.; Molino, Alberto ; Prada, Francisco ; Quintana, José María
Issue Date2013
PublisherEDP Sciences
CitationAstronomy and Astrophysics 557: A78 (2013)
Abstract[Aims]: We aim to illustrate the potentiality of the Advanced Large, Homogeneous Area, Medium-Band Redshift Astronomical (ALHAMBRA) survey to investigate the high-redshift universe through the detection of quasi stellar objects (QSOs) at redshifts higher than 5. [Methods]: We searched for QSOs candidates at high redshift by fitting an extensive library of spectral energy distributions-including active and non-active galaxy templates, as well as stars-to the photometric database of the ALHAMBRA survey (composed of 20 optical medium-band plus the 3 broad-band JHKs near-infrared filters). [Results]: Our selection over ≈1 square degree of ALHAMBRA data (∼1/4 of the total area covered by the survey), combined with GTC/OSIRIS spectroscopy, has yielded identification of an optically faint QSO at very high redshift (z = 5.41). The QSO has an absolute magnitude of ∼-24 at the 1450 Å continuum, a bolometric luminosity of ≈2 × 1046 erg s -1, and an estimated black hole mass of ≈108 M ⊙. This QSO adds itself to a reduced number of known UV faint sources at these redshifts. The preliminary derived space density is compatible with the most recent determinations of the high-z QSO luminosity functions. This new detection shows how ALHAMBRA, as well as forthcoming well-designed photometric surveys, can provide a wealth of information on the origin and early evolution of this kind of object. © 2013 ESO.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201321920
Identifiersdoi: 10.1051/0004-6361/201321920
issn: 0004-6361
e-issn: 1432-0746
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