Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/31046
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Spingola, C. | en_US |
dc.contributor.author | DALLACASA, DANIELE | en_US |
dc.contributor.author | Belladitta, S. | en_US |
dc.contributor.author | CACCIANIGA, Alessandro | en_US |
dc.contributor.author | GIROLETTI, MARCELLO | en_US |
dc.contributor.author | MORETTI, Alberto | en_US |
dc.contributor.author | ORIENTI, Monica | en_US |
dc.date.accessioned | 2021-09-20T14:45:50Z | - |
dc.date.available | 2021-09-20T14:45:50Z | - |
dc.date.issued | 2020 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/31046 | - |
dc.description.abstract | We present Director's Discretionary Time multi-frequency observations obtained with the Jansky Very Large Array (VLA) and the Very Long Baseline Array (VLBA) of the blazar PSO J030947.49+271757.31 (hereafter PSO J0309+27) at z = 6.10+/-0.03. The milliarcsecond angular resolution of our VLBA observations at 1.5, 5 and 8.4 GHz unveils a bright one-sided jet extended for $\sim500$ parsecs in projection. This high-z radio-loud AGN is resolved into multiple compact sub-components, embedded in a more diffuse and faint radio emission, which enshrouds them in a continuous jet structure. We derive limits on some physical parameters directly from the observable quantities, such as viewing angle, Lorentz and Doppler factors. If PSO J0309+27 is a genuine blazar, as suggested by its X-ray properties, then we find that its bulk Lorentz factor must be relatively low (less than 5). Such value would be in favour of a scenario currently proposed to reconcile the paucity of high-z blazars with respect to current predictions. Nevertheless, we cannot exclude that PSO J0309+27 is seen under a larger viewing angle, which would imply that the X-ray emission must be enhanced, for example, by inverse Compton with the Cosmic Microwave Background. More stringent constraints on the bulk Lorentz factor in PSO J0309+27 and the other high-z blazars are necessary to test whether their properties are intrinsically different with respect to the low-z blazar population. | en_US |
dc.language.iso | eng | en_US |
dc.title | Parsec-scale properties of the radio brightest jetted AGN at z > 6 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/202039458 | en_US |
dc.identifier.scopus | 2-s2.0-85096175949 | en_US |
dc.identifier.isi | WOS:000593929300001 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2020/11/aa39458-20/aa39458-20.html | en_US |
dc.identifier.url | http://arxiv.org/abs/2010.11193v1 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 643 | en_US |
dc.relation.firstpage | L12 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 7 | en_US |
dc.description.international | no | en_US |
dc.contributor.country | ITA | 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.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::PE9_11 Relativistic astrophysics | 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 | IRA Bologna | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0003-1246-6492 | - |
crisitem.author.orcid | 0000-0002-2339-8264 | - |
crisitem.author.orcid | 0000-0002-8657-8852 | - |
crisitem.author.orcid | 0000-0002-9770-0315 | - |
crisitem.author.orcid | 0000-0003-4470-7094 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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aa39458-20(3).pdf | Pdf editoriale | 3.05 MB | Adobe PDF | Visualizza/apri |
Spingola et al. - 2020 - Parsec-scale properties of the radio brightest jetted AGN at z 6.pdf | 2.92 MB | Adobe PDF | Visualizza/apri |
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