X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z = 6.56
dc.bibliographicCitation.firstPage | A127 | |
dc.bibliographicCitation.journalTitle | Astronomy and astrophysics : an international weekly journal | eng |
dc.bibliographicCitation.volume | 669 | |
dc.contributor.author | Wolf, J. | |
dc.contributor.author | Nandra, K. | |
dc.contributor.author | Salvato, M. | |
dc.contributor.author | Buchner, J. | |
dc.contributor.author | Onoue, M. | |
dc.contributor.author | Liu, T. | |
dc.contributor.author | Arcodia, R. | |
dc.contributor.author | Merloni, A. | |
dc.contributor.author | Ciroi, S. | |
dc.contributor.author | Di Mille, F. | |
dc.contributor.author | Burwitz, V. | |
dc.contributor.author | Brusa, M. | |
dc.contributor.author | Ishimoto, R. | |
dc.contributor.author | Kashikawa, N. | |
dc.contributor.author | Matsuoka, Y. | |
dc.contributor.author | Urrutia, T. | |
dc.contributor.author | Waddell, S.G.H. | |
dc.date.accessioned | 2023-06-02T14:57:33Z | |
dc.date.available | 2023-06-02T14:57:33Z | |
dc.date.issued | 2023 | |
dc.description.abstract | The space density of X-ray-luminous, blindly selected active galactic nuclei (AGN) traces the population of rapidly accreting super-massive black holes through cosmic time. It is encoded in the X-ray luminosity function, whose bright end remains poorly constrained in the first billion years after the Big Bang as X-ray surveys have thus far lacked the required cosmological volume. With the eROSITA Final Equatorial-Depth Survey (eFEDS), the largest contiguous and homogeneous X-ray survey to date, X-ray AGN population studies can now be extended to new regions of the luminosity-redshift space (L2-10 keV > 1045 erg s-1 and z > 6). Aims. The current study aims at identifying luminous quasars at z > 5:7 among X-ray-selected sources in the eFEDS field in order to place a lower limit on black hole accretion well into the epoch of re-ionisation. A secondary goal is the characterisation of the physical properties of these extreme coronal emitters at high redshifts. Methods. Cross-matching eFEDS catalogue sources to optical counterparts from the DESI Legacy Imaging Surveys, we confirm the low significance detection with eROSITA of a previously known, optically faint z = 6:56 quasar from the Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs) survey. We obtained a pointed follow-up observation of the source with the Chandra X-ray telescope in order to confirm the low-significance eROSITA detection. Using new near-infrared spectroscopy, we derived the physical properties of the super-massive black hole. Finally, we used this detection to infer a lower limit on the black hole accretion density rate at z > 6. Results. The Chandra observation confirms the eFEDS source as the most distant blind X-ray detection to date. The derived X-ray luminosity is high with respect to the rest-frame optical emission of the quasar.With a narrow Mgii line, low derived black hole mass, and high Eddington ratio, as well as its steep photon index, the source shows properties that are similar to local narrow-line Seyfert 1 galaxies, which are thought to be powered by young super-massive black holes. In combination with a previous high-redshift quasar detection in the field, we show that quasars with L2-10 keV > 1045 erg s-1 dominate accretion onto super-massive black holes at z _ 6. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/12228 | |
dc.identifier.uri | http://dx.doi.org/10.34657/11260 | |
dc.language.iso | eng | |
dc.publisher | Les Ulis : EDP Sciences | |
dc.relation.doi | https://doi.org/10.1051/0004-6361/202244688 | |
dc.relation.essn | 1432-0746 | |
dc.relation.issn | 0004-6361 | |
dc.rights.license | CC BY 4.0 Unported | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0 | |
dc.subject.ddc | 520 | |
dc.subject.other | galaxies: high-redshift | eng |
dc.subject.other | quasars: individual: J092120.6+000725.9 | eng |
dc.subject.other | X-rays: galaxies | eng |
dc.title | X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z = 6.56 | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | |
wgl.contributor | AIP | |
wgl.subject | Physik | ger |
wgl.type | Zeitschriftenartikel | ger |
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