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Title:
Resolving the host galaxy of a distant blazar with LBT/LUCI 1 + ARGOS
Authors:
Farina, E. P.; Georgiev, I. Y.; Decarli, R.; Terzic, T.; Busoni, L.; Gässler, W.; Mazzoni, T.; Borelli, J.; Rosensteiner, M.; Ziegleder, J.; Bonaglia, M.; Rabien, S.; Buschkamp, P.; Orban de Xivry, G.; Rahmer, G.; Kulas, M.; Peter, D.
Affiliation:
AA(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany 0000-0002-6822-2254), AB(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AC(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; Osservatorio Astronomico di Bologna, via Gobetti 93/3, I-40129 Bologna, Italy), AD(Department of Physics, University of Rijeka, Radmile Matejcic 2, HR-51000 Rijeka, Croatia), AE(Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy), AF(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AG(Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy), AH(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AI(Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AJ(Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AK(Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy), AL(Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AM(Buschkamp Research Instruments, Elisabethstrasse 2, D-80796 München, Germany), AN(Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching, Germany), AO(LBT Observatory, University of Arizona, 933 N. Cherry Ave, Tucson, AZ-85721, USA), AP(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AQ(Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; Heidelberg Instruments Mikrotechnik GmbH, Tullastrasse 2, D-69126 Heidelberg, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 2, p.1835-1839 (MNRAS Homepage)
Publication Date:
05/2018
Origin:
OUP
Astronomy Keywords:
instrumentation: adaptive optics, BL Lacertae objects: individual: HESS J1943+213, infrared: galaxies
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty352
Bibliographic Code:
2018MNRAS.476.1835F

Abstract

BL Lac objects emitting in the very high energy (VHE) regime are unique tools to peer into the properties of the extragalactic background light (EBL). However, due to the typical absence of features in their spectra, the determination of their redshifts has proven challenging. In this work, we exploit the superb spatial resolution delivered by the new Advanced Rayleigh guided Ground layer adaptive Optics System (ARGOS) at the Large Binocular Telescope to detect the host galaxy of HESS J1943+213, a VHE emitting BL Lac shining through the Galaxy. Deep H-band imaging collected during the ARGOS commissioning allowed us to separate the contribution of the nuclear emission and to unveil the properties of the host galaxy with unprecedented detail. The host galaxy is well fitted by a Sérsic profile with index of n ˜ 2 and total magnitude of HHost ˜ 16.15 mag. Under the assumption that BL Lac host galaxies are standard candles, we infer a redshift of z ˜ 0.21. In the framework of the current model for the EBL, this value is in agreement with the observed dimming of the VHE spectrum due to the annihilation of energetic photons on the EBL
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