The jet of the BL Lac object PKS 0521 -365 in the near-IR : MAD adaptive optics observations
R. Falomo, E. Pian, A. Treves, G. Giovannini, T. Venturi, A. Moretti,, C. Arcidiacono, J. Farinato, R. Ragazzoni, E. Diolaiti, M. Lombini, F., Tavecchio, R. Brast, E. Marchetti, S. Tordo

TL;DR
This study uses high-resolution adaptive optics near-IR imaging to analyze the jet structure of the BL Lac object PKS 0521-365 across multiple wavelengths, revealing detailed jet features and their emission mechanisms.
Contribution
First near-IR adaptive optics images of PKS 0521-365's jet at high resolution, combined with multi-wavelength data, providing new insights into jet structure and emission.
Findings
Jet structure is similar across radio, near-IR, and optical wavelengths.
Jet knots' emission is dominated by synchrotron radiation.
Discovered near-IR counterpart of radio hotspot.
Abstract
BL Lac objects are low--power active nuclei exhibiting a variety of peculiar properties that are caused by the presence of a relativistic jet and orientation effects. We present here adaptive optics near-IR images at high spatial resolution of the nearby BL Lac object PKS 0521-365, which is known to display a prominent jet both at radio and optical frequencies. The observations were obtained in Ks--band using the ESO multi-conjugated adaptive optics demonstrator at the Very Large Telescope. This allowed us to obtain images with 0.1 arcsec effective resolution. We performed a detailed analysis of the jet and its related features from the near-IR images, and combined them with images previously obtained with HST in the R band and by a re-analysis of VLA radio maps. We find a remarkable similarity in the structure of the jet at radio, near-IR, and optical wavelengths. The broad--band…
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