Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/29784
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Mazzucchelli, C. | en_US |
dc.contributor.author | Banados, E. | en_US |
dc.contributor.author | Venemans, Bram | en_US |
dc.contributor.author | DECARLI, ROBERTO | en_US |
dc.contributor.author | Farina, E.P. | en_US |
dc.contributor.author | Walter, f. | en_US |
dc.contributor.author | Eilers, A.-C. | en_US |
dc.contributor.author | Rix, H.-W. | en_US |
dc.contributor.author | Simcoe, R. | en_US |
dc.contributor.author | Stern, D. | en_US |
dc.contributor.author | Fan, X. | en_US |
dc.contributor.author | Schlafly, E. | en_US |
dc.contributor.author | De Rosa, G. | en_US |
dc.contributor.author | Hennawi, J. | en_US |
dc.contributor.author | Chambers, K.C. | en_US |
dc.contributor.author | Greiner, J. | en_US |
dc.contributor.author | Burgett, W. | en_US |
dc.contributor.author | Draper, P.W. | en_US |
dc.contributor.author | Kaiser, N. | en_US |
dc.contributor.author | Kudritzki, R.-P. | en_US |
dc.contributor.author | Magnier, E. | en_US |
dc.contributor.author | Metcalfe, N. | en_US |
dc.contributor.author | Waters, C. | en_US |
dc.contributor.author | Wainscoat, R.J. | en_US |
dc.date.accessioned | 2021-01-15T12:49:34Z | - |
dc.date.available | 2021-01-15T12:49:34Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/29784 | - |
dc.description.abstract | Quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they are unique probes of the early universe. To date, only a few quasars have been reported at z> 6.5 (<800 Myr after the big bang). In this work, we present six additional z≳ 6.5 quasars discovered using the Pan-STARRS1 survey. We use a sample of 15 z≳ 6.5 quasars to perform a homogeneous and comprehensive analysis of this highest-redshift quasar population. We report four main results: (1) the majority of z≳ 6.5 quasars show large blueshifts of the broad C IV λ1549 emission line compared to the systemic redshift of the quasars, with a median value ∼3× higher than a quasar sample at z∼ 1; (2) we estimate the quasars’ black hole masses ({M}{BH} ∼ (0.3-5) × 109 M ☉) via modeling of the Mg II λ2798 emission line and rest-frame UV continuum and find that quasars at high redshift accrete their material (with < ({L}{bol}/{L}{Edd})> =0.39) at a rate comparable to a luminosity-matched sample at lower redshift, albeit with significant scatter (0.4 dex); (3) we recover no evolution of the Fe II/Mg II abundance ratio with cosmic time; and (4) we derive near-zone sizes and, together with measurements for z∼ 6 quasars from recent work, confirm a shallow evolution of the decreasing quasar near-zone sizes with redshift. Finally, we present new millimeter observations of the [C II] 158 μm emission line and underlying dust continuum from NOEMA for four quasars and provide new accurate redshifts and [C II]/infrared luminosity estimates. The analysis presented here shows the large range of properties of the most distant quasars. | en_US |
dc.language.iso | eng | en_US |
dc.title | Physical Properties of 15 Quasars at z ≳ 6.5 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aa9185 | en_US |
dc.identifier.scopus | 2-s2.0-85034447832 | en_US |
dc.identifier.isi | 000414587300011 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aa9185 | en_US |
dc.relation.medium | STAMPA | 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 | 2017ApJ...849...91M | 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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Mazzucchelli_2017_ApJ_849_91.pdf | Pdf editoriale | 7.13 MB | Adobe PDF | Visualizza/apri |
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