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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27676
Title: Resolving the host galaxy of a distant blazar with LBT/LUCI 1 + ARGOS
Authors: Farina, E. P.
Georgiev, I. Y.
DECARLI, ROBERTO 
Terzić, T.
BUSONI, LORENZO 
Gässler, W.
Mazzoni, T.
Borelli, J.
Rosensteiner, M.
Ziegleder, J.
BONAGLIA, MARCO 
Rabien, S.
Buschkamp, P.
Orban de Xivry, G.
Rahmer, G.
Kulas, M.
Peter, D.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 476
Issue: 2
First Page: 1835
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 H<SUB>Host</SUB> ∼ 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
URI: http://hdl.handle.net/20.500.12386/27676
URL: https://academic.oup.com/mnras/article/476/2/1835/4848313
ISSN: 0035-8711
DOI: 10.1093/mnras/sty352
Bibcode ADS: 2018MNRAS.476.1835F
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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