SIMBAD references

2006A&A...460..665D - Astronomy and Astrophysics, volume 460, 665-672 (2006/12-4)

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

DOMINICI T.P., ABRAHAM Z. and GALO A.L.

Abstract (from CDS):

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. 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 14min 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. 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.

Abstract Copyright:

Journal keyword(s): galaxies: BL Lacertae objects: individual: PKS 2005-489 - galaxies: BL Lacertae objects: individual: PKS 2155-304

Nomenclature: Fig.1: [DAG2006] PKS 2005-489 N (Nos 1-4), [DAG2006] PKS 2005-489 G N=1, [DAG2006] PKS 2155-304 N (Nos 1-6).

Simbad objects: 13

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2019.10.23-18:59:13

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