Matches in SemOpenAlex for { <https://semopenalex.org/work/W3100018971> ?p ?o ?g. }
- W3100018971 endingPage "71" @default.
- W3100018971 startingPage "71" @default.
- W3100018971 abstract "The variation in the high-energy cutoff, Ec, in active galactic nuclei (AGNs) uniquely probes the corona physics. In this work, we show that the ratio of two NuSTAR spectra (analogous to the difference-imaging technique widely used in astronomy) is uniquely useful in studying Ec variations. The spectra ratio could directly illustrate potential Ec variation between two spectra. By comparing with the ratio of two spectral-fitting models, it also examines the reliability of the spectral fitting measured Ec variation. Assisted with this technique, we revisit the five AGNs in the literature (MCG-5-23-16, 3C 382, NGC 4593, NGC 5548, and Mrk 335), for which Ec (kTe) variations have been claimed with NuSTAR observations. We show that the claimed Ec variations appear inconsistent with the spectra ratios in three of them, thus they need to be revised, demonstrating the striking usefulness of spectra ratio. We present thereby improved spectral-fitting results and Ec variations. We also report a new source with Ec variations based on NuSTAR observations (radio galaxy 4C+74.26). We find the corona tends to be hotter when it brightens (hotter-when-brighter) in 3C 382, NGC 5548, Mrk 335, and 4C+74.27, but MCG-5-23-16 and NGC 4593 show no evidence of significant Ec variations. Meanwhile, all six sources in this small sample appear softer when brighter. Changes in corona geometry are required to explain the observed hotter-when-brighter trends." @default.
- W3100018971 created "2020-11-23" @default.
- W3100018971 creator A5023108523 @default.
- W3100018971 creator A5070883343 @default.
- W3100018971 creator A5077764377 @default.
- W3100018971 date "2018-08-10" @default.
- W3100018971 modified "2023-09-24" @default.
- W3100018971 title "On Measuring the Variation of High-energy Cutoff in Active Galactic Nuclei" @default.
- W3100018971 cites W1655017597 @default.
- W3100018971 cites W1844333606 @default.
- W3100018971 cites W1863430243 @default.
- W3100018971 cites W1968862162 @default.
- W3100018971 cites W1972615891 @default.
- W3100018971 cites W1988722437 @default.
- W3100018971 cites W1998894652 @default.
- W3100018971 cites W2014220587 @default.
- W3100018971 cites W2018041393 @default.
- W3100018971 cites W2031016170 @default.
- W3100018971 cites W2033875501 @default.
- W3100018971 cites W2038957637 @default.
- W3100018971 cites W2047844795 @default.
- W3100018971 cites W2053806672 @default.
- W3100018971 cites W2068399357 @default.
- W3100018971 cites W2074347757 @default.
- W3100018971 cites W2075762066 @default.
- W3100018971 cites W2078719403 @default.
- W3100018971 cites W2109806013 @default.
- W3100018971 cites W2123997370 @default.
- W3100018971 cites W2126050016 @default.
- W3100018971 cites W2136076204 @default.
- W3100018971 cites W2156126431 @default.
- W3100018971 cites W2159189930 @default.
- W3100018971 cites W2163628221 @default.
- W3100018971 cites W2166256493 @default.
- W3100018971 cites W2170263323 @default.
- W3100018971 cites W2189947922 @default.
- W3100018971 cites W2257191970 @default.
- W3100018971 cites W2277429080 @default.
- W3100018971 cites W2293287464 @default.
- W3100018971 cites W2496241600 @default.
- W3100018971 cites W2573945549 @default.
- W3100018971 cites W2606017081 @default.
- W3100018971 cites W2769305500 @default.
- W3100018971 cites W2783686844 @default.
- W3100018971 cites W2949448497 @default.
- W3100018971 cites W3027862860 @default.
- W3100018971 cites W3098454888 @default.
- W3100018971 cites W3098552238 @default.
- W3100018971 cites W3098980677 @default.
- W3100018971 cites W3100172136 @default.
- W3100018971 cites W3103088146 @default.
- W3100018971 cites W3105716749 @default.
- W3100018971 cites W3105919417 @default.
- W3100018971 cites W3121417988 @default.
- W3100018971 cites W3121774938 @default.
- W3100018971 cites W3122192992 @default.
- W3100018971 cites W3124315852 @default.
- W3100018971 cites W3125458086 @default.
- W3100018971 cites W4302942360 @default.
- W3100018971 doi "https://doi.org/10.3847/1538-4357/aacf92" @default.
- W3100018971 hasPublicationYear "2018" @default.
- W3100018971 type Work @default.
- W3100018971 sameAs 3100018971 @default.
- W3100018971 citedByCount "13" @default.
- W3100018971 countsByYear W31000189712019 @default.
- W3100018971 countsByYear W31000189712020 @default.
- W3100018971 countsByYear W31000189712021 @default.
- W3100018971 countsByYear W31000189712022 @default.
- W3100018971 countsByYear W31000189712023 @default.
- W3100018971 crossrefType "journal-article" @default.
- W3100018971 hasAuthorship W3100018971A5023108523 @default.
- W3100018971 hasAuthorship W3100018971A5070883343 @default.
- W3100018971 hasAuthorship W3100018971A5077764377 @default.
- W3100018971 hasBestOaLocation W31000189711 @default.
- W3100018971 hasConcept C121332964 @default.
- W3100018971 hasConcept C1276947 @default.
- W3100018971 hasConcept C195803813 @default.
- W3100018971 hasConcept C2776779350 @default.
- W3100018971 hasConcept C2778217198 @default.
- W3100018971 hasConcept C2778334786 @default.
- W3100018971 hasConcept C2779900269 @default.
- W3100018971 hasConcept C43481613 @default.
- W3100018971 hasConcept C44870925 @default.
- W3100018971 hasConcept C4839761 @default.
- W3100018971 hasConcept C62520636 @default.
- W3100018971 hasConcept C87355193 @default.
- W3100018971 hasConcept C98444146 @default.
- W3100018971 hasConceptScore W3100018971C121332964 @default.
- W3100018971 hasConceptScore W3100018971C1276947 @default.
- W3100018971 hasConceptScore W3100018971C195803813 @default.
- W3100018971 hasConceptScore W3100018971C2776779350 @default.
- W3100018971 hasConceptScore W3100018971C2778217198 @default.
- W3100018971 hasConceptScore W3100018971C2778334786 @default.
- W3100018971 hasConceptScore W3100018971C2779900269 @default.
- W3100018971 hasConceptScore W3100018971C43481613 @default.
- W3100018971 hasConceptScore W3100018971C44870925 @default.
- W3100018971 hasConceptScore W3100018971C4839761 @default.
- W3100018971 hasConceptScore W3100018971C62520636 @default.