Resolving the Host Galaxy of a Distant Blazar with LBT/LUCI 1 + ARGOS (CROSBI ID 248950)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Farina, E. P. ; Georgiev, I. Y. ; Decarli, R. ; Terzić, Tomislav ; Busoni, L. ; Gässler, W. ; Mazzoni, T. ; Borelli, J. ; Rosensteiner, M. ; Ziegleder, J. ; Bonaglia, M. ; Rabien, S. ; Buschkamp, P. ; de Xivry, G. Orban ; Rahmer, G. ; Kulas, M. ; Peter, D.
engleski
Resolving the Host Galaxy of a Distant Blazar with LBT/LUCI 1 + ARGOS
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 scatter of energetic photons on the EBL.
instrumentation: adaptive optics, infrared: galaxies, BL Lacertae objects: individual: HESS J1943+213
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Podaci o izdanju
476 (2)
2018.
1835-1839
objavljeno
0035-8711
1365-2966
10.1093/mnras/sty352