Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/27478
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Bañados, Eduardo | en_US |
dc.contributor.author | Connor, Thomas | en_US |
dc.contributor.author | Stern, Daniel | en_US |
dc.contributor.author | Mulchaey, John | en_US |
dc.contributor.author | Fan, Xiaohui | en_US |
dc.contributor.author | DECARLI, ROBERTO | en_US |
dc.contributor.author | Farina, Emanuele P. | en_US |
dc.contributor.author | Mazzucchelli, Chiara | en_US |
dc.contributor.author | Venemans, Bram P. | en_US |
dc.contributor.author | Walter, Fabian | en_US |
dc.contributor.author | Wang, Feige | en_US |
dc.contributor.author | Yang, Jinyi | en_US |
dc.date.accessioned | 2020-09-25T10:49:29Z | - |
dc.date.available | 2020-09-25T10:49:29Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 2041-8205 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27478 | - |
dc.description.abstract | We present a 45 ks Chandra observation of the quasar ULAS J1342+0928 at z = 7.54. We detect {14.0}<SUB>-3.7</SUB><SUP>+4.8</SUP> counts from the quasar in the observed-frame energy range 0.5-7.0 keV (6σ detection), representing the most distant non-transient astronomical source identified in X-rays to date. The present data are sufficient only to infer rough constraints on the spectral parameters. We find an X-ray hardness ratio of { \mathcal H }{ \mathcal R }=-{0.51}<SUB>-0.28</SUB><SUP>+0.26</SUP> between the 0.5-2.0 keV and 2.0-7.0 keV ranges and derive a power-law photon index of {{Γ }}={1.95}<SUB>-0.53</SUB><SUP>+0.55</SUP>. Assuming a typical value for high-redshift quasars of Γ = 1.9, ULAS J1342+0928 has a 2-10 keV rest-frame X-ray luminosity of {L}<SUB>2-10</SUB>={11.6}<SUB>-3.5</SUB><SUP>+4.3</SUP>× {10}<SUP>44</SUP> {erg} {{{s}}}<SUP>-1</SUP>. Its X-ray-to-optical power-law slope is {α }<SUB>OX</SUB>}=-{1.67}<SUB>-0.10</SUB><SUP>+0.16</SUP>, consistent with the general trend indicating that the X-ray emission in the most bolometrically powerful quasars is weaker relative to their optical emission. | en_US |
dc.language.iso | eng | en_US |
dc.title | Chandra X-Rays from the Redshift 7.54 Quasar ULAS J1342+0928 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/2041-8213/aab61e | en_US |
dc.identifier.scopus | 2-s2.0-85045565720 | en_US |
dc.identifier.isi | 000428667600003 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/2041-8213/aab61e | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 856 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | L25 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL LETTERS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018ApJ...856L..25B | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 2041-8205 | - |
crisitem.journal.ance | E196528 | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-2662-8803 | - |
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