Optical and near-infrared simultaneous observations of the BL Lacs PKS 2005-489 and PKS 2155-304

Details Optical and near-infrared simultaneous observations of the BL Lacs PKS 2005-489 and PKS 2155-304 Optical and near-infrared simultaneous observations of the BL Lacs PKS 2005-489 and PKS 2155-304

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...460..665d&link_type=abstract

Astronomy and Astrophysics, Volume 460, Issue 3, December IV 2006, pp.665-672

Astronomy and Astrophysics

Astrophysics

6

Galaxies: Bl Lacertae Objects: Individual: Pks 2005-489, Galaxies: Bl Lacertae Objects: Individual: Pks 2155-304

Scientific paper

Aims.In this work, we looked for simultaneous brigthness variations in the optical and near-infrared bands in the TeV BL Lacs PKS 2005-489 and PKS 2155-304, covering time scales from minutes to a few years. Methods: .Between 2001 and 2003, we carried out optical and near-infrared observations using two telescopes at the Pico dos Dias Observatory (LNA, Brazil), reaching a time resolution in the light curves of about 14 min at optical wavelengths and 6 min in the infrared. For both sources the variability analysis was done after the contribution of the host galaxy was subtracted from the observed flux. Results: .In PKS 2005-489 we detected for the first time optical and near-infrared variations on time scales of minutes. Both sources presented variability on different time scales and with complex and distinct spectral behavior. This behavior favors a scenario in which the variability is produced by the formation and fast evolution of shock waves in the quiescent or slowly varying nuclear jet.

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