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journal id: "astrophysicalxjournal"
| Authors||E. Treister, F.J. Castander, T.J. Maccarone, D. Herrera, E. Gawiser, J. Maza, P.S. Coppi|
|Title||An X-Ray-selected Active Galactic Nucleus at z=4.6 Discovered by the CYDER Survey|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Astronomical Institute Anton Pannekoek (IAP)|
|Abstract||We present the discovery of a high-redshift, X-ray-selected active galactic nucleus (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 AGNs. 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 supermassive black hole of ~10<SUP>8</SUP> M<SUB>solar</SUB> emitting at 1% of its Eddington luminosity. Deep radio observations can discriminate between these two hypotheses.|
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