VERITAS and multiwavelength observations of the BL Lacertae object 1ES 1741+196

A U Abeysekara,R Mukherjee,E Pueschel,D Hanna,N Park,M Krause,P T Reynolds,S Griffin,A W Smith,J Tyler,A Wilhelm,B Zitzer,G H Sembroski,D Petry,S P Wakely,A O'Faoláin De Bhróithe,G Ratliff,V Bugaev,D A Williams,D Nieto,J Dumm,R A Ong,J V Tucci,J Biteau,E Roache,V Pelassa,J Quinn,J Holder,F Krennrich,A Popkow,Q Feng,L Ciupik,K Meagher,T B Humensky,M Kertzman,C A Johnson,R Bird,G Maier,I Telezhinsky,A Furniss,L Fortson,P Fortin,M Errando,M J Lang,A Petrashyk,A Mccann,K Shahinyan,S Vincent,G Gyuk,M Pohl,A Archer,N Kelley-Hoskins,K Ragan,H J Dickinson,X Chen,M Buchovecky,P Kar,M Huetten,J P Finley,M Santander,G H Gillanders,W Benbow,M Cerruti,J L Christiansen,A Falcone,D Kieda,P Moriarty,A N Otte,K Byrum,D Staszak,S Archambault,A Flinders,S Mcarthur,J H Buckley,J Grube,O M Weiner,Henrike Fleischhack ,J Eisch ,J V Cardenzana ,G Richards ,A J.r Weinstein ,S O’brien ,Kaeleigh Reynolds ,Philip Kaaret ,C B Rulten ,Luis Reyes ,Wei Cui ,Michael Connolly

doi:10.1093/mnras/stw664

Abstract

We present results from multiwavelength observations of the BL Lacertae object 1ES 1741+196, including results in the very-high-energy $\gamma$-ray regime using the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The VERITAS time-averaged spectrum, measured above 180 GeV, is well-modelled by a power law with a spectral index of $2.7\pm0.7_{\mathrm{stat}}\pm0.2_{\mathrm{syst}}$. The integral flux above 180 GeV is $(3.9\pm0.8_{\mathrm{stat}}\pm1.0_{\mathrm{syst}})\times 10^{-8}$ m$^{-2}$ s$^{-1}$, corresponding to 1.6% of the Crab Nebula flux on average. The multiwavelength spectral energy distribution of the source suggests that 1ES 1741+196 is an extreme-high-frequency-peaked BL Lacertae object. The observations analysed in this paper extend over a period of six years, during which time no strong flares were observed in any band. This analysis is therefore one of the few characterizations of a blazar in a non-flaring state.

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