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    The XMM deep survey in the CDF-S IV. Compton-thick AGN candidates

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    The XMM deep survey ... (718.7Kb)
    Identificadores
    URI: http://hdl.handle.net/10902/4093
    DOI: 10.1051/0004-6361/201220828
    ISSN: 0004-6361
    ISSN: 1432-0746
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    Author
    Georgantopoulos, Ioannis; Comastri, Andrea; Vignali, Cristian; Ranalli, Piero; Rovilos, Emmanouel; Iwasawa, Kazushi; Gilli, Roberto; Cappelluti, Nico; Carrera Troyano, Francisco Jesús; Fritz, Jacopo; Brusa, Marcella; Elbaz, David; Mullaney, James R.; Castelló Mor, Núria; Barcons Jáuregui, Xavier; Tozzi, Paolo; Balestra, Italo; Falocco, Serena
    Date
    2013-07
    Derechos
    © ESO, 2013
    Publicado en
    Astronomy and Astrophysics, Vol. 555, Art. Num. A43 (2013)
    Publisher
    EDP Sciences
    Enlace a la publicación
    http://dx.doi.org/10.1051/0004-6361/201220828
    Palabras clave
    X-rays: diffuse background
    Infrared: galaxies
    Galaxies: active
    X-rays: galaxies
    Abstract:
    The Chandra Deep Field is the region of the sky with the highest concentration of X-ray data available: 4 Ms of Chandra and 3 Ms of XMM-Newton data, allowing excellent quality spectra to be extracted even for faint sources. We took advantage of this to compile a sample of heavily obscured active galactic nuclei (AGN) using X-ray spectroscopy. We selected our sample among the 176 brightest XMM-Newton sources, searching for either flat X-ray spectra (Γ < 1.4 at the 90% confidence level) suggestive of a reflection dominated continuum or an absorption turn-over suggestive of a column density higher than ≈ 1024 cm-2. We found a sample of nine heavily-obscured sources satisfying the above criteria. Four of these show statistically significant FeKα lines with large equivalent widths (three out of four have equivalent widths consistent with 1 keV) suggesting that these are the most certain Compton-thick AGN candidates. Two of these sources are transmission dominated while the other two are most probably reflection dominated Compton-thick AGN. Although this sample of four sources is by no means statistically complete, it represents the best example of Compton-thick sources found at moderate-to-high redshift with three sources at z = 1.2–1.5 and one source at z = 3.7. Using Spitzer and Herschel observations, we estimate with good accuracy the X-ray to mid-IR (12 μm) luminosity ratio of our sources. These are well below the average AGN relation, independently suggesting that these four sources are heavily obscured.
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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