Estudo de variabilidades espectral e temporal de radiofontes

AUTOR(ES)

Márcio Ribeiro Gastaldi

DATA DE PUBLICAÇÃO

2007

RESUMO

We present the results of a 2-year project to monitor the spectral and temporal variability of Sagittarius A, Centaurus A, OV236 and the Einsteins Ring PKS1830-211 from 2004 to 2006. The observational data were obtained from the Itapetinga Radio Telescope at 22 and 43GHz. The data at 4,8, 8,0 and 14,5GHz for OV236 and PKS1830-211 were taken from the Michigan Radio Observatory. We also obtained previous observations of OV236 and PKS1830-211 at 100 and 230GHz from the Swedish-ESO Sub Millimeter Telescope (SEST), and VLA 23 and 43GHz data for Sgr A*. We estimated parameters such as period, angular size and brightness temperature and applied the Shock Wave Model (MARSHER; GEAR 1985) for OV236. The work we present here results from an international cooperation among Brazil (Itapetinga at 22 and 43GHz), EUA (Michigan at 4,8, 8,0 and 14,5GHz, and the VLA at 23 and 43GHz) and Finland (Metsähovi at 90GHz).

ASSUNTO(S)

engenharia eletrica quasares variability variabilidade quasars agn rádio contínuo radio continuum agn

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