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|Title:||An emerging population of BL Lacs with extreme properties: towards a class of EBL and cosmic magnetic field probes?||Authors:||Bonnoli, G.
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||451||Issue:||1||First Page:||611||Abstract:||High-energy observations of extreme BL Lac objects, such as 1ES 0229+200 or 1ES 0347-121, recently focused interest both for blazar and jet physics and for the implication on the extragalactic background light and intergalactic magnetic field estimate. However, the number of these extreme highly peaked BL Lac objects (EHBL) is still rather small. Aiming at increase their number, we selected a group of EHBL candidates starting from the BL Lac sample of Plotkin et al. (2011), considering those undetected (or only barely detected) by the Large Area Telescope onboard Fermi and characterized by a high X-ray versus radio flux ratio. We assembled the multiwavelength spectral energy distribution of the resulting nine sources, profiting of publicly available archival observations performed by Swift, GALEX, and Fermi satellites, confirming their nature. Through a simple one-zone synchrotron self-Compton model we estimate the expected very high energy flux, finding that in the majority of cases it is within the reach of present generation of Cherenkov arrays or of the forthcoming Cherenkov Telescope Array.||Acknowledgments:||FT and GB acknowledge financial contribution from grant PRIN-INAF-2011. This work is based on the publicly available Fermi /LAT data obtained through the Science Support Center (SSC). This research has made use of data obtained from the HEASARC, provided by NASA's Goddard Space Flight Center. We acknowledge the use of public data from the Swift data archive. We also acknowledge use of GALEX data made publically available through the MAST. Part of this work is based on archival data, software or online services provided by the ASDC. We thank the referee Andreas Zech for comments that helped in improving the paper. We also acknowledge constructive comments from M. Cerutti, K. Murase, Y. Tanaka, and D. Sanchez.||URI:||http://hdl.handle.net/20.500.12386/23184||URL:||https://academic.oup.com/mnras/article/451/1/611/1367163||ISSN:||0035-8711||DOI:||10.1093/mnras/stv953||Bibcode ADS:||2015MNRAS.451..611B||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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