INVESTIGADORES
CELLONE Sergio Aldo
artículos
Título:
Two-color photometry with high temporal resolution of the extremely variable blazar PKS 0537-441
Autor/es:
ROMERO, G. E.; CELLONE, S. A.; COMBI, J. A.
Revista:
ASTRONOMICAL JOURNAL
Editorial:
The American Astronomical Society
Referencias:
Año: 2000 vol. 120 p. 1192 - 1197
ISSN:
0004-6256
Resumen:
We report the results of a microvariability monitoring campaign on the
southern blazar PKS 0537-441. The source was observed in the V and R
optical bands throughout six consecutive nights. Strong variations at
both bands, with amplitudes of ~0.3 mag, were observed on timescales of
about 2 days. Smaller fluctuations of ~0.05 mag on a scale of a couple
of hours are superposed on the larger outburst. The spectral index was
also variable during the observing period, with an average value of
α=-1.6 and changes up to ~27.5%. The spectrum varies in the sense
that it becomes harder when the source is brighter, in accordance with
predictions of shock-in-jet models. We discuss our results and the
possible origin of the variability in this blazar in light of recent
higher frequency observations.