Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120.1192r&link_type=abstract
The Astronomical Journal, Volume 120, Issue 3, pp. 1192-1197.
Astronomy and Astrophysics
Astronomy
23
Bl Lacertae Objects: Individual (Pks 0537-441), Galaxies: Active, Galaxies: Photometry
Scientific paper
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.
Cellone Sergio A.
Combi Jorge Ariel
Romero Gustavo E.
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