An XMM-Newton catalogue of BL Lacs
I. de la Calle P\'erez, N. \'Alvarez Crespo, E. Racero, A. Rouco

TL;DR
This paper presents a comprehensive XMM-Newton catalogue of BL Lac objects, analyzing their X-ray, optical, and UV properties, variability, and spectral models, and integrating multi-wavelength data for a large sample over 20 years.
Contribution
It provides the first homogeneous analysis of BL Lac X-ray and optical/UV data from XMM-Newton, including spectral fitting, variability assessment, and multi-wavelength cataloging.
Findings
Log parabola model is preferred at higher fluxes, indicating intrinsic curvature.
Detected X-ray counterparts for 103 BL Lacs from 1151 in the catalog.
The catalogue includes spectral, variability, and multi-wavelength data for the sample.
Abstract
We present an XMM-Newton catalogue of BL Lac X-ray, optical, and UV properties based on cross-correlation with the 1151 BL Lacs listed in the fifth edition of the Roma-BZCAT. We searched for the X-ray counterparts to these objects in the field of view of all pointed observations in the XMM-Newton archive over nearly 20 years of mission. The cross-correlation yields a total of 310 XMM-Newton fields which correspond to 103 different BL Lacs. We homogeneously analysed data from the three EPIC cameras (X-ray) and OM(optical/UV) using the XMM-Newton SAS software, and produced images, light curves, and spectral products for BL Lacs detected in any of the three EPIC cameras. We tested two different phenomenological models, log parabola and power law, with different variations of the absorbing column density and extracted their parameters. We derived time-variability information from the light…
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