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

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 candidate...

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Detalhes bibliográficos
Autores: Matute, I., Masegosa, J., Márquez, I., Fernández Soto, Alberto|||0000-0002-5732-3121, Husillos, C., Olmo, A. del, Perea, J., Povic, M., Ascaso, B., Alfaro Navarro, Emilio Javier, Moles, M., López Aguerri, José Alfonso, Aparicio-Villegas, T., Benitez, N., Broadhurst, T., Cabrera-Caño, J., Castander, F. J., Cepa, J., Cerviño, M., Cristóbal-Hornillos, D., Infante, L., González Delgado, R. M., Martínez, V. J., Molino, A., Prada, F., Quintana, J. M.
Tipo de documento: artigo
Data de publicação:2013
País:España
Recursos:Universidad de Cantabria (UC)
Repositório:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglês
OAI Identifier:oai:repositorio.unican.es:10902/4841
Acesso em linha:http://hdl.handle.net/10902/4841
Access Level:Acceso aberto
Palavra-chave:Galaxies: active
Quasars: general
Galaxies: distances and redshifts
Galaxies: high-redshift
Galaxies: evolution
Quasars: emission lines
Descrição
Resumo: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.

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