Resolving the host galaxy of a distant blazar with LBT/LUCI 1 + ARGOS
| Autor: | Gustavo Rahmer, Iskren Y. Georgiev, G. Orban de Xivry, Tommaso Mazzoni, Martin Kulas, Matthias Rosensteiner, D. Peter, Wolfgang Gässler, Roberto Decarli, Emanuele Paolo Farina, Sebastian Rabien, M. Bonaglia, L. Busoni, Tomislav Terzić, J. Borelli, Peter Buschkamp, J. Ziegleder |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 0103 physical sciences Blazar 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Luminous infrared galaxy Cosmic distance ladder Astronomy and Astrophysics Large Binocular Telescope Astrophysics - Astrophysics of Galaxies Redshift Galaxy Extragalactic background light Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Magnitude (astronomy) instrumentation: adaptive optics infrared: galaxies BL Lacertae objects: individual: HESS J1943+213 Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| Popis: | 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 S\'ersic profile with index of n~2 and total magnitude of H~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. Comment: 6 pages, 4 figures, 1 table. If you would like to have access to the fully reduced H-band image of HESS J1943+213 please inquire the first Author or check https://github.com/EmAstro/LBT_ARGOS/. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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