Uso do periodograma de lomb e da transformada Wavelet para detecção de periodicidades em radiofontes extragalácticas

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dc.contributor.advisorBotti, Luiz Claudio Lima
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/8648945122004492por
dc.contributor.authorGastaldi, Marcio Ribeiro
dc.creator.Latteshttp://lattes.cnpq.br/1530872967791481por
dc.date.accessioned2017-03-24T15:09:14Z
dc.date.accessioned2020-05-28T18:15:01Z
dc.date.available2020-05-28T18:15:01Z
dc.date.issued2016-12-16
dc.description.abstractIn the present work we applied the Lomb periodogram and the wavelet transform to the light curves of three extragalactic radio sources observed by the Michigan radio telescope at 4.8 GHz, 8.0 GHz and 14.5 GHz. The results obtained using the two spectral analysis tools are complimentary to each other in the sense that the wavelet transform provided the perspective of the temporal behavior of the Lomb periodogram content. In order to take into account as much information as possible, we included VLBI data to the analysis of explosions detected in the radio light curves. Moreover, we searched for correlation between the zero-separation times and maxima/minima found in the periodicities curves revealed by the wavelet transform. In the case of the quasar OJ287 we found a new oscillatory behavior in the ~1.6 yr periodicity detected by Hughes et al. (1999). This modulation showed a ~6 yr period sinusoidal profile that agrees with the existence of a binary of black holes regulating the ejection rate of plasmons from the central region of OJ287. We detected approximately 1.6 yr and 3.3 yr periodicities of the quasar OV236. As a future work, these periodicities and their temporal behavior could be associated to the accretion dynamics of its black hole/disk. We added the radio source 0333+321 to the present essay because it presents excellent sampling and a much higher redshift when compared to OJ287 and OV236. We also plotted the spectra of selected outbursts and calculated the parameters of the related radio emission regions such as the variability radius and the brightness temperature.eng
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dc.identifier.citationGASTALDI, Marcio Ribeiro. Uso do periodograma de lomb e da transformada Wavelet para detecção de periodicidades em radiofontes extragalácticas. 2016. 150 f. Tese (Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie, São Paulo .por
dc.identifier.urihttp://dspace.mackenzie.br/handle/10899/25791
dc.keywordsquasarseng
dc.keywordsradio continuumeng
dc.keywordsfouriereng
dc.keywordswaveleteng
dc.languageporpor
dc.publisherUniversidade Presbiteriana Mackenziepor
dc.rightsAcesso Abertopor
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectquasarespor
dc.subjectcontínuo rádiopor
dc.subjectFourierpor
dc.subjectWaveletpor
dc.subject.cnpqCNPQ::CIENCIAS EXATAS E DA TERRA::ASTRONOMIA::ASTROFISICA EXTRAGALACTICApor
dc.thumbnail.urlhttp://tede.mackenzie.br/jspui/retrieve/13535/Marcio_Ribeiro_Gastaldi..pdf.jpg*
dc.titleUso do periodograma de lomb e da transformada Wavelet para detecção de periodicidades em radiofontes extragalácticaspor
dc.typeTesepor
local.contributor.board1Szpigel, Sérgio
local.contributor.board1Latteshttp://lattes.cnpq.br/2578978663165124por
local.contributor.board2Correia, Emilia
local.contributor.board2Latteshttp://lattes.cnpq.br/1272123236892781por
local.contributor.board3Cecatto, José Roberto
local.contributor.board3Latteshttp://lattes.cnpq.br/6513046926936437por
local.contributor.board4Souza, Carlos Alexandre Wuensche de
local.contributor.board4Latteshttp://lattes.cnpq.br/1448223845901360por
local.publisher.countryBrasilpor
local.publisher.departmentEscola de Engenharia Mackenzie (EE)por
local.publisher.initialsUPMpor
local.publisher.programCiências e Aplicações Geoespaciaispor
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