Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...517a..63t&link_type=abstract
Astronomy and Astrophysics, Volume 517, id.A63
Astronomy and Astrophysics
Astrophysics
2
Bl Lacertae Objects: General, Bl Lacertae Objects: Individual: Pks 0735+178, Techniques: Photometric
Scientific paper
Context. The properties of variable sources responsible for blazar activity are still under discussion. Some conclusions can be drawn from analyzing monitoring observations. Aims: The results of multicolour monitoring observations of the blazar PKS 0735+178 are used to study the colour behaviour of the variable source responsible for the blazar activity in 1994-2004. Methods: The method of “flux-flux” diagrams is used to find the SED of the variable source. Results: The SED of the variable source was unchanged on timescales of years and is represented well by a power-law. High observed polarization and power-law spectrum point to the synchrotron nature of the variable source. The achromatic variability can then be explained by variations in the Doppler boosting due to 10^circ-variations in the angle between the line of sight and the velocity direction of the radiating source. Conclusions: There is no doubt about the synchrotron nature of the variable source. The most probable reason for this variability is the change in the Doppler boosting.
Ciprini Stefano
Hagen-Thorn E. I.
Hagen-Thorn Vladimir A.
Sillanpää Aimo
Takalo Leo Olavi
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