Matches in SemOpenAlex for { <https://semopenalex.org/work/W3098070880> ?p ?o ?g. }
Showing items 1 to 89 of
89
with 100 items per page.
- W3098070880 abstract "We present multiwavelength observations of 3C 454.3 from April 2008 to March 2010. The radio to optical data are mostly from the GASP-WEBT, UV and X-ray data from Swift, and gamma-ray data from the AGILE and Fermi satellites. We improved the calibration of optical-UV data from the UVOT and OM instruments and estimated the Lyalpha flux to disentangle the contributions from different components in this spectral region. The observations reveal prominent variability above 8 GHz. In the optical-UV band, the variability amplitude decreases with increasing frequency due to a steadier radiation from both a broad line region and an accretion disc. The optical flux reaches nearly the same levels in the 2008-2009 and 2009-2010 observing seasons; the mm one shows similar behaviour, whereas the gamma and X-ray flux levels rise in the second period. Two prominent gamma-ray flares in mid 2008 and late 2009 show a double-peaked structure, with a variable gamma/optical flux ratio. The X-ray flux variations seem to follow the gamma-ray and optical ones by about 0.5 and 1 d, respectively. We interpret the multifrequency behaviour in terms of an inhomogeneous curved jet, where synchrotron radiation of increasing wavelength is produced in progressively outer and wider jet regions, which can change their orientation in time. In particular, we assume that the long-term variability is due to this geometrical effect. By combining the optical and mm light curves to fit the gamma and X-ray ones, we find that the gamma (X-ray) emission may be explained by inverse-Comptonisation of synchrotron optical (IR) photons by their parent relativistic electrons (SSC process). A slight, variable misalignment between the synchrotron and Comptonisation zones would explain the increased gamma and X-ray flux levels in 2009-2010, as well as the change in the gamma/optical flux ratio during the outbursts peaks." @default.
- W3098070880 created "2020-11-23" @default.
- W3098070880 creator A5000627504 @default.
- W3098070880 creator A5014829349 @default.
- W3098070880 creator A5053651858 @default.
- W3098070880 creator A5055771153 @default.
- W3098070880 creator A5067065216 @default.
- W3098070880 creator A5069900236 @default.
- W3098070880 creator A5084784260 @default.
- W3098070880 creator A5086348462 @default.
- W3098070880 date "2011-07-06" @default.
- W3098070880 modified "2023-09-27" @default.
- W3098070880 title "The long-lasting activity of 3C 454.3. GASP-WEBT and satellite observations in 2008-2010" @default.
- W3098070880 cites W3129541624 @default.
- W3098070880 hasPublicationYear "2011" @default.
- W3098070880 type Work @default.
- W3098070880 sameAs 3098070880 @default.
- W3098070880 citedByCount "3" @default.
- W3098070880 countsByYear W30980708802015 @default.
- W3098070880 countsByYear W30980708802016 @default.
- W3098070880 countsByYear W30980708802021 @default.
- W3098070880 crossrefType "journal-article" @default.
- W3098070880 hasAuthorship W3098070880A5000627504 @default.
- W3098070880 hasAuthorship W3098070880A5014829349 @default.
- W3098070880 hasAuthorship W3098070880A5053651858 @default.
- W3098070880 hasAuthorship W3098070880A5055771153 @default.
- W3098070880 hasAuthorship W3098070880A5067065216 @default.
- W3098070880 hasAuthorship W3098070880A5069900236 @default.
- W3098070880 hasAuthorship W3098070880A5084784260 @default.
- W3098070880 hasAuthorship W3098070880A5086348462 @default.
- W3098070880 hasBestOaLocation W30980708801 @default.
- W3098070880 hasConcept C100752510 @default.
- W3098070880 hasConcept C120665830 @default.
- W3098070880 hasConcept C121332964 @default.
- W3098070880 hasConcept C1276947 @default.
- W3098070880 hasConcept C130726490 @default.
- W3098070880 hasConcept C153385146 @default.
- W3098070880 hasConcept C16332341 @default.
- W3098070880 hasConcept C180205008 @default.
- W3098070880 hasConcept C186769553 @default.
- W3098070880 hasConcept C191897082 @default.
- W3098070880 hasConcept C192562407 @default.
- W3098070880 hasConcept C19269812 @default.
- W3098070880 hasConcept C44870925 @default.
- W3098070880 hasConcept C6260449 @default.
- W3098070880 hasConcept C68709404 @default.
- W3098070880 hasConcept C7910260 @default.
- W3098070880 hasConceptScore W3098070880C100752510 @default.
- W3098070880 hasConceptScore W3098070880C120665830 @default.
- W3098070880 hasConceptScore W3098070880C121332964 @default.
- W3098070880 hasConceptScore W3098070880C1276947 @default.
- W3098070880 hasConceptScore W3098070880C130726490 @default.
- W3098070880 hasConceptScore W3098070880C153385146 @default.
- W3098070880 hasConceptScore W3098070880C16332341 @default.
- W3098070880 hasConceptScore W3098070880C180205008 @default.
- W3098070880 hasConceptScore W3098070880C186769553 @default.
- W3098070880 hasConceptScore W3098070880C191897082 @default.
- W3098070880 hasConceptScore W3098070880C192562407 @default.
- W3098070880 hasConceptScore W3098070880C19269812 @default.
- W3098070880 hasConceptScore W3098070880C44870925 @default.
- W3098070880 hasConceptScore W3098070880C6260449 @default.
- W3098070880 hasConceptScore W3098070880C68709404 @default.
- W3098070880 hasConceptScore W3098070880C7910260 @default.
- W3098070880 hasLocation W30980708801 @default.
- W3098070880 hasLocation W30980708802 @default.
- W3098070880 hasLocation W30980708803 @default.
- W3098070880 hasOpenAccess W3098070880 @default.
- W3098070880 hasPrimaryLocation W30980708801 @default.
- W3098070880 hasRelatedWork W1536332814 @default.
- W3098070880 hasRelatedWork W1608763162 @default.
- W3098070880 hasRelatedWork W1628443661 @default.
- W3098070880 hasRelatedWork W1832305232 @default.
- W3098070880 hasRelatedWork W1946590003 @default.
- W3098070880 hasRelatedWork W1969295939 @default.
- W3098070880 hasRelatedWork W1979115990 @default.
- W3098070880 hasRelatedWork W2029677436 @default.
- W3098070880 hasRelatedWork W2033220168 @default.
- W3098070880 hasRelatedWork W2037717465 @default.
- W3098070880 hasRelatedWork W2046488460 @default.
- W3098070880 hasRelatedWork W2067963599 @default.
- W3098070880 hasRelatedWork W2134787236 @default.
- W3098070880 hasRelatedWork W2137354936 @default.
- W3098070880 hasRelatedWork W2146805014 @default.
- W3098070880 hasRelatedWork W2156497844 @default.
- W3098070880 hasRelatedWork W2170904276 @default.
- W3098070880 isParatext "false" @default.
- W3098070880 isRetracted "false" @default.
- W3098070880 magId "3098070880" @default.
- W3098070880 workType "article" @default.