Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26015
DC Field | Value | Language |
---|---|---|
dc.contributor.author | D'AMMANDO, FILIPPO | en_US |
dc.contributor.author | ORIENTI, Monica | en_US |
dc.date.accessioned | 2020-06-12T07:57:48Z | - |
dc.date.available | 2020-06-12T07:57:48Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26015 | - |
dc.description.abstract | We investigate the γ-ray and X-ray properties of the flat spectrum radio quasar PKS 2149-306 at redshift z = 2.345. A strong γ-ray flare from this source was detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope satellite in 2013 January, reaching on January 20 a daily peak flux of (301 ± 36) × 10<SUP>-8</SUP> ph cm<SUP>-2</SUP> s<SUP>-1</SUP> in the 0.1-100 GeV energy range. This flux corresponds to an apparent isotropic luminosity of (1.5 ± 0.2) × 10<SUP>50</SUP> erg s<SUP>-1</SUP>, comparable to the highest values observed by a blazar so far. During the flare the increase of flux was accompanied by a significant change of the spectral properties. Moreover significant flux variations on a 6-h time-scale were observed, compatible with the light crossing time of the event horizon of the central black hole. The broad-band X-ray spectra of PKS 2149-306 observed by Swift-XRT and NuSTAR are well described by a broken power-law model, with a very hard spectrum (Γ<SUB>1</SUB> ∼ 1) below the break energy, at E<SUB> break</SUB> = 2.5-3.0 keV, and Γ<SUB>2</SUB> ∼ 1.4-1.5 above the break energy. The steepening of the spectrum below ∼3 keV may indicate that the soft X-ray emission is produced by the low-energy relativistic electrons. This is in agreement with the small variability amplitude and the lack of spectral changes in that part of the X-ray spectrum observed between the two NuSTAR and Swift joint observations. As for the other high-redshift FSRQ detected by both Fermi-LAT and Swift-BAT, the photon index of PKS 2149-306 in hard X-ray is 1.6 or lower and the average γ-ray luminosity higher than 2 × 10<SUP>48</SUP> erg s<SUP>-1</SUP>. | en_US |
dc.language.iso | eng | en_US |
dc.title | High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stv2452 | en_US |
dc.identifier.scopus | 2-s2.0-85025090163 | en_US |
dc.identifier.isi | 000368007100055 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/455/2/1881/1121821 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 455 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1881 | en_US |
dc.relation.lastpage | 1891 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 2 | 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 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016MNRAS.455.1881D | 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.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.orcid | 0000-0001-7618-7527 | - |
crisitem.author.orcid | 0000-0003-4470-7094 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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stv2452.pdf | Pdf editoriale | 591.31 kB | Adobe PDF | View/Open |
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