Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27965
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Sandrinelli, A. | en_US |
dc.contributor.author | COVINO, Stefano | en_US |
dc.contributor.author | Treves, A. | en_US |
dc.contributor.author | Holgado, A. M. | en_US |
dc.contributor.author | Sesana, A. | en_US |
dc.contributor.author | Lindfors, E. | en_US |
dc.contributor.author | Ramazani, V. F. | en_US |
dc.date.accessioned | 2020-10-23T12:49:53Z | - |
dc.date.available | 2020-10-23T12:49:53Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27965 | - |
dc.description.abstract | We review the reports of possible year-long quasi-periodicities of BL Lac objects in the γ-ray and optical bands, and present a homogeneous time analysis of the light curves of PKS2155-304, PG1553+113, and BL Lac. Based on results from a survey covering the entire Fermi γ-ray sky we have estimated the fraction of possible quasi-periodic BL Lac objects. We compared the cyclical behaviour in BL Lac objects with that derived from the search of possible optical periodicities in quasars, and find that at z ≲ 1 the cosmic density of quasi-periodic BL Lac objects is larger than that of quasi-periodic quasars. If the BL Lac quasi-periodicities were due to a supermassive binary black hole (SBBH) scenario, there could be a tension with the upper limits on the gravitational wave background measured by the pulsar timing array. The argument clearly indicates the difficulties of generally associating quasi-periodicities of BL Lac objects with SBBHs. | en_US |
dc.language.iso | eng | en_US |
dc.title | Quasi-periodicities of BL Lacertae objects | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201732550 | en_US |
dc.identifier.scopus | 2-s2.0-85054092581 | en_US |
dc.identifier.isi | 000439936700007 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2018/07/aa32550-17/aa32550-17.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 615 | en_US |
dc.relation.firstpage | A118 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | 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 | 2018A&A...615A.118S | 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::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos | 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 | O.A. Brera | - |
crisitem.author.orcid | 0000-0001-9078-5507 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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aa32550-17.pdf | Pdf editoriale | 1.42 MB | Adobe PDF | View/Open |
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