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25 April 2024 |
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An X-ray Selected AGN at z=4.6 Discovered by the CYDER Survey | | Ezequiel Treister
; Francisco J. Castander
; Thomas J. Maccarone
; David Herrera
; Eric Gawiser
; Jose Maza
; Paolo S. Coppi
; | | Date: |
15 Nov 2003 | | Journal: | Astrophys.J. 603 (2004) 36-41 | | Subject: | astro-ph | | Affiliation: | 1,2), Francisco J. Castander , Thomas J. Maccarone , David Herrera , Eric Gawiser (2,1), Jose Maza and Paolo S. Coppi ( Yale, U de Chile, IEEC/CSIC, Barcelona, Amsterdam | | Abstract: | We present the discovery of a high redshift, X-ray selected AGN by the Calan-Yale Deep Extragalactic Research (CYDER) survey: CXOCY J033716.7-050153, located at $z=4.61$, the second high redshift AGN discovered by this survey. Here, we present its optical, near-IR and X-ray properties and compare it with other optical and X-ray selected high redshift AGN. The optical luminosity of this object is significantly lower than most optically selected high redshift quasars. It also has a lower rest frame UV to X-ray emission ratio than most known quasars at this redshift. This mild deviation can be explained either by dust obscuring the UV radiation of a normal radio quiet AGN emitting at 10% of its Eddington luminosity or because this is intrinsically a low luminosity radio loud AGN, with a super-massive Black Hole of $sim 10^8M_sun$ emitting at 1% of its Eddington luminosity. Deep radio observations can discriminate between these two hypotheses. | | Source: | arXiv, astro-ph/0311356 | | Services: | Forum | Review | PDF | Favorites | |
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