Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31265
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Connor, Thomas | en_US |
dc.contributor.author | Bañados, Eduardo | en_US |
dc.contributor.author | Mazzucchelli, Chiara | en_US |
dc.contributor.author | Stern, Daniel | en_US |
dc.contributor.author | DECARLI, ROBERTO | en_US |
dc.contributor.author | Fan, Xiaohui | en_US |
dc.contributor.author | Farina, Emanuele Paolo | en_US |
dc.contributor.author | LUSSO, ELISABETA | en_US |
dc.contributor.author | Neeleman, Marcel | en_US |
dc.contributor.author | Walter, Fabian | en_US |
dc.date.accessioned | 2021-12-28T09:36:59Z | - |
dc.date.available | 2021-12-28T09:36:59Z | - |
dc.date.issued | 2020 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31265 | - |
dc.description.abstract | We present deep Chandra observations of PSO J231.6576-20.8335, a quasar at redshift z = 6.59 with a nearby (∼8 proper kpc) companion galaxy. The Atacama Large Millimeter/submillimeter Array observed both the quasar and companion to be bright in [C II], and the system has significant extended Lyα emission around the quasar, suggesting that a galaxy merger is ongoing. Unlike previous studies of two similar systems, and despite observing the system with Chandra for 140 ks, we do not detect the companion in X-rays. The quasar itself is detected, but only ${13.3}_{-3.7}^{+4.8}$ net counts are observed. From a basic spectral analysis, the X-ray spectrum of the quasar is soft (hardness ratio of ${ \mathcal H }{ \mathcal R }=-{0.60}_{-0.27}^{+0.17}$ , power-law index of ${\rm{\Gamma }}={2.6}_{-0.9}^{+1.0}$ ), which results in a rest-frame X-ray luminosity comparable to other bright quasars ( ${L}_{2\mbox{--}10}={1.09}_{-0.70}^{+2.20}\times {10}^{45}\ \mathrm{erg}\ {{\rm{s}}}^{-1}$ ) despite the faint observed X-ray flux. We highlight two possible interpretations of this result: the quasar has a steep value of Γ—potentially related to observed ongoing Eddington accretion—thereby pushing much of the emission out of our observed band, or the quasar has a more normal spectrum (Γ ∼ 2) but is therefore less X-ray luminous ( ${L}_{2\mbox{--}10}\sim 0.6\times {10}^{45}\ \mathrm{erg}\ {{\rm{s}}}^{-1}$ ). | en_US |
dc.language.iso | eng | en_US |
dc.title | X-Ray Observations of a [C II]-bright, z = 6.59 Quasar/Companion System | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/abaab9 | en_US |
dc.identifier.scopus | 2-s2.0-85093499291 | en_US |
dc.identifier.isi | WOS:000570805100001 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/abaab9 | en_US |
dc.identifier.url | https://api.elsevier.com/content/abstract/scopus_id/85093499291 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 900 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 189 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2020ApJ...900..189C | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | 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.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0002-2662-8803 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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2007.14571.pdf | preprint | 975.77 kB | Adobe PDF | Visualizza/apri |
Connor_2020_ApJ_900_189.pdf | [Administrators only] | 787.55 kB | Adobe PDF |
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