Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28572
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Connor, Thomas | en_US |
dc.contributor.author | Bañados, Eduardo | en_US |
dc.contributor.author | Stern, Daniel | en_US |
dc.contributor.author | DECARLI, ROBERTO | en_US |
dc.contributor.author | Schindler, Jan-Torge | en_US |
dc.contributor.author | Fan, Xiaohui | en_US |
dc.contributor.author | Farina, Emanuele Paolo | en_US |
dc.contributor.author | Mazzucchelli, Chiara | en_US |
dc.contributor.author | Mulchaey, John S. | en_US |
dc.contributor.author | Walter, Fabian | en_US |
dc.date.accessioned | 2020-11-27T09:13:09Z | - |
dc.date.available | 2020-11-27T09:13:09Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28572 | - |
dc.description.abstract | Quasars at early redshifts (z > 6) with companion galaxies offer unique insights into the growth and evolution of the first supermassive black holes. Here, we report on a 150 ks Chandra observation of PSO J308.0416-21.2339, a z = 6.23 quasar with a merging companion galaxy identified in [C II] and rest-frame UV emission. With {72.3}<SUB>-8.6</SUB><SUP>+9.6</SUP> net counts, we find that PSO J308.0416-21.2339 is powerful ({L}<SUB>X</SUB>={2.31}<SUB>-0.76</SUB><SUP>+1.14</SUP>× {10}<SUP>45</SUP> {erg} {{{s}}}<SUP>-1</SUP> {cm}}<SUP>-2</SUP> in rest-frame 2.0-10.0 keV) yet soft (spectral power-law index {{Γ }}={2.39}<SUB>-0.36</SUB><SUP>+0.37</SUP> and optical-to-X-ray slope α <SUB>OX</SUB> = -1.41 ± 0.11). In addition, we detect three hard-energy photons 2.″0 to the west of the main quasar, cospatial with the brightest UV emission of the merging companion. As no soft-energy photons are detected in the same area, this is potentially indicative of a highly obscured source. With conservative assumptions, and accounting for both background fluctuations and the extended wings of the quasar’s emission, these photons only have a probability P = 0.021 of happening by chance. If confirmed by deeper observations, this system is the first high-redshift quasar and companion individually detected in X-rays and is likely a dual active galactic nucleus. | en_US |
dc.language.iso | eng | en_US |
dc.title | X-Ray Observations of a z ∼ 6.2 Quasar/Galaxy Merger | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/ab5585 | en_US |
dc.identifier.scopus | 2-s2.0-85077596465 | en_US |
dc.identifier.isi | 000506012000065 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/ab5585 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 887 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 171 | 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 | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2019ApJ...887..171C | 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 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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Connor_2019_ApJ_887_171_red.pdf | Pdf editoriale | 1.13 MB | Adobe PDF | View/Open |
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