Matches in SemOpenAlex for { <https://semopenalex.org/work/W4290694279> ?p ?o ?g. }
- W4290694279 endingPage "A71" @default.
- W4290694279 startingPage "A71" @default.
- W4290694279 abstract "Variability, both in X-ray and optical/UV, affects the well-known anti-correlation between the $alpha_{ox}$ spectral index and the UV luminosity of active galactic nuclei, contributing part of the dispersion around the average correlation (intra-source dispersion), in addition to the differences among the time-average $alpha_{ox}$ values from source to source (inter-source dispersion). We want to evaluate the intrinsic $alpha_{ox}$ variations in individual objects, and their effect on the dispersion of the $alpha_{ox}-L_{UV}$ anti-correlation. We use simultaneous UV/X-ray data from Swift observations of a low-redshift sample, to derive the epoch-dependent $alpha_{ox}(t)$ indices. We correct for the host galaxy contribution by a spectral fit of the optical/UV data. We compute ensemble structure functions to analyse variability of multi-epoch data. We find a strong intrinsic $alpha_{ox}$ variability, which makes an important contribution ($sim40%$ of the total variance) to the dispersion of the $alpha_{ox}-L_{UV}$ anti-correlation (intra-source dispersion). The strong X-ray variability and weaker UV variability of this sample are comparable to other samples of low-z AGNs, and are neither due to the high fraction of strongly variable NLS1s, nor to dilution of the optical variability by the host galaxies. Dilution affects instead the slope of the anti-correlation, which steepens, once corrected, becoming similar to higher luminosity sources. The structure function of $alpha_{ox}$ increases with the time lag up to $sim$1 month. This indicates the important contribution of the intermediate-long timescale variations, possibly generated in the outer parts of the accretion disk." @default.
- W4290694279 created "2022-08-09" @default.
- W4290694279 creator A5010814445 @default.
- W4290694279 creator A5014472013 @default.
- W4290694279 creator A5062063219 @default.
- W4290694279 date "2013-01-29" @default.
- W4290694279 modified "2023-09-30" @default.
- W4290694279 title "Variability and the X-ray/UV ratio of active galactic nuclei" @default.
- W4290694279 cites W1890522558 @default.
- W4290694279 cites W1974461164 @default.
- W4290694279 cites W1984823803 @default.
- W4290694279 cites W1985786875 @default.
- W4290694279 cites W1987748065 @default.
- W4290694279 cites W1991012881 @default.
- W4290694279 cites W1998508186 @default.
- W4290694279 cites W2001144908 @default.
- W4290694279 cites W2003517804 @default.
- W4290694279 cites W2006331007 @default.
- W4290694279 cites W2007714429 @default.
- W4290694279 cites W2009419686 @default.
- W4290694279 cites W2011150310 @default.
- W4290694279 cites W2022269079 @default.
- W4290694279 cites W2023193194 @default.
- W4290694279 cites W2027581992 @default.
- W4290694279 cites W2028754600 @default.
- W4290694279 cites W2036259292 @default.
- W4290694279 cites W2042598102 @default.
- W4290694279 cites W2044663555 @default.
- W4290694279 cites W2049514487 @default.
- W4290694279 cites W2051556129 @default.
- W4290694279 cites W2065723954 @default.
- W4290694279 cites W2065823691 @default.
- W4290694279 cites W2071140355 @default.
- W4290694279 cites W2077390582 @default.
- W4290694279 cites W2090903589 @default.
- W4290694279 cites W2103889499 @default.
- W4290694279 cites W2119836155 @default.
- W4290694279 cites W2131903666 @default.
- W4290694279 cites W2144467079 @default.
- W4290694279 cites W2169204353 @default.
- W4290694279 cites W2603282528 @default.
- W4290694279 cites W2796705535 @default.
- W4290694279 cites W2894698587 @default.
- W4290694279 cites W3099261622 @default.
- W4290694279 cites W3101003558 @default.
- W4290694279 cites W3102320523 @default.
- W4290694279 cites W3102547671 @default.
- W4290694279 cites W3102573769 @default.
- W4290694279 cites W3102648482 @default.
- W4290694279 cites W3104614702 @default.
- W4290694279 cites W3105130586 @default.
- W4290694279 cites W4292026935 @default.
- W4290694279 doi "https://doi.org/10.1051/0004-6361/201220443" @default.
- W4290694279 hasPublicationYear "2013" @default.
- W4290694279 type Work @default.
- W4290694279 citedByCount "36" @default.
- W4290694279 countsByYear W42906942792013 @default.
- W4290694279 countsByYear W42906942792014 @default.
- W4290694279 countsByYear W42906942792015 @default.
- W4290694279 countsByYear W42906942792016 @default.
- W4290694279 countsByYear W42906942792017 @default.
- W4290694279 countsByYear W42906942792018 @default.
- W4290694279 countsByYear W42906942792019 @default.
- W4290694279 countsByYear W42906942792020 @default.
- W4290694279 countsByYear W42906942792021 @default.
- W4290694279 countsByYear W42906942792022 @default.
- W4290694279 countsByYear W42906942792023 @default.
- W4290694279 crossrefType "journal-article" @default.
- W4290694279 hasAuthorship W4290694279A5010814445 @default.
- W4290694279 hasAuthorship W4290694279A5014472013 @default.
- W4290694279 hasAuthorship W4290694279A5062063219 @default.
- W4290694279 hasBestOaLocation W42906942791 @default.
- W4290694279 hasConcept C120665830 @default.
- W4290694279 hasConcept C121332964 @default.
- W4290694279 hasConcept C12287442 @default.
- W4290694279 hasConcept C1276947 @default.
- W4290694279 hasConcept C177562468 @default.
- W4290694279 hasConcept C17959413 @default.
- W4290694279 hasConcept C33024259 @default.
- W4290694279 hasConcept C42061751 @default.
- W4290694279 hasConcept C43481613 @default.
- W4290694279 hasConcept C44870925 @default.
- W4290694279 hasConcept C4839761 @default.
- W4290694279 hasConcept C96618451 @default.
- W4290694279 hasConcept C97355855 @default.
- W4290694279 hasConcept C98444146 @default.
- W4290694279 hasConceptScore W4290694279C120665830 @default.
- W4290694279 hasConceptScore W4290694279C121332964 @default.
- W4290694279 hasConceptScore W4290694279C12287442 @default.
- W4290694279 hasConceptScore W4290694279C1276947 @default.
- W4290694279 hasConceptScore W4290694279C177562468 @default.
- W4290694279 hasConceptScore W4290694279C17959413 @default.
- W4290694279 hasConceptScore W4290694279C33024259 @default.
- W4290694279 hasConceptScore W4290694279C42061751 @default.
- W4290694279 hasConceptScore W4290694279C43481613 @default.
- W4290694279 hasConceptScore W4290694279C44870925 @default.
- W4290694279 hasConceptScore W4290694279C4839761 @default.
- W4290694279 hasConceptScore W4290694279C96618451 @default.