Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/29167
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Vito, F. | en_US |
dc.contributor.author | Brandt, W. N. | en_US |
dc.contributor.author | Bauer, F. E. | en_US |
dc.contributor.author | GILLI, Roberto | en_US |
dc.contributor.author | Luo, B. | en_US |
dc.contributor.author | Zamorani, G. | en_US |
dc.contributor.author | CALURA, Francesco | en_US |
dc.contributor.author | COMASTRI, Andrea | en_US |
dc.contributor.author | Mazzucchelli, C. | en_US |
dc.contributor.author | Mignoli, M. | en_US |
dc.contributor.author | Nanni, R. | en_US |
dc.contributor.author | Shemmer, O. | en_US |
dc.contributor.author | Vignali, C. | en_US |
dc.contributor.author | Brusa, M. | en_US |
dc.contributor.author | Cappelluti, N. | en_US |
dc.contributor.author | Civano, F. | en_US |
dc.contributor.author | Volonteri, M. | en_US |
dc.date.accessioned | 2020-12-23T15:25:06Z | - |
dc.date.available | 2020-12-23T15:25:06Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29167 | - |
dc.description | We acknowledge financial contribution from the agreement ASI-INAF n. 2017-14-H.O | en_US |
dc.description.abstract | While theoretical arguments predict that most of the early growth of supermassive black holes (SMBHs) happened during heavily obscured phases of accretion, current methods used for selecting z > 6 quasars (QSOs) are strongly biased against obscured QSOs, thus considerably limiting our understanding of accreting SMBHs during the first gigayear of the Universe from an observational point of view. We report the Chandra discovery of the first heavily obscured QSO candidate in the early universe, hosted by a close (≈5 kpc) galaxy pair at z = 6.515. One of the members is an optically classified type-1 QSO, PSO167-13. The companion galaxy was first detected as a [C II] emitter by Atacama large millimeter array (ALMA). An X-ray source is significantly (P = 0.9996) detected by Chandra in the 2-5 keV band, with < 1.14 net counts in the 0.5-2 keV band, although the current positional uncertainty does not allow a conclusive association with either PSO167-13 or its companion galaxy. From X-ray photometry and hardness-ratio arguments, we estimated an obscuring column density of N<SUB>H</SUB> > 2 × 10<SUP>24</SUP> cm<SUP>-2</SUP> and N<SUB>H</SUB> > 6 × 10<SUP>23</SUP> cm<SUP>-2</SUP> at 68% and 90% confidence levels, respectively. Thus, regardless of which of the two galaxies is associated with the X-ray emission, this source is the first heavily obscured QSO candidate at z > 6. | en_US |
dc.language.iso | eng | en_US |
dc.title | Discovery of the first heavily obscured QSO candidate at z > 6 in a close galaxy pair | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201935924 | en_US |
dc.identifier.scopus | 2-s2.0-85074184289 | en_US |
dc.identifier.isi | 000480311200001 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2019/08/aa35924-19/aa35924-19.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 628 | en_US |
dc.relation.firstpage | L6 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | USA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2019A&A...628L...6V | 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.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.dept | OAS Bologna | - |
crisitem.author.orcid | 0000-0001-8121-6177 | - |
crisitem.author.orcid | 0000-0002-6175-0871 | - |
crisitem.author.orcid | 0000-0003-3451-9970 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
aa35924-19.pdf | Pdf editoriale | 420 kB | Adobe PDF | View/Open |
1906.04241.pdf | postprint | 423.07 kB | Adobe PDF | View/Open |
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Items in DSpace are published in Open Access, unless otherwise indicated.