Optical spectroscopy of blazars for the Cherenkov Telescope Array
Author
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Goldoni, P.
Author
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Pita, S.
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Boisson, C.
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Max-Moerbeck Astudillo, Walter Kennerth
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Kasai, E.
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Williams, D. A.
Author
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D’Ammando, F.
Author
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Navarro Aránguiz, Víctor Alberto
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Backes, M.
Author
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Barres de Almeida, U.
Author
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Becerra González, J.
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Cotter, G.
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Hervet, O.
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Lenain, J. P.
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Lindfors, E.
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Sol, H.
Author
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Wagner, S.
Admission date
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2022-03-29T13:34:05Z
Available date
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2022-03-29T13:34:05Z
Publication date
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2021
Cita de ítem
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A&A 650, A106 (2021)
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Identifier
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10.1051/0004-6361/202040090
Identifier
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https://repositorio.uchile.cl/handle/2250/184562
Abstract
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Context. Blazars are the most numerous class of high-energy (HE; E similar to 50 MeV-100 GeV) and very high-energy (VHE; E similar to 100 GeV-10 TeV) gamma-ray emitters. Currently, a measured spectroscopic redshift is available for only about 50% of gamma-ray BL Lacertae objects (BL Lacs), mainly due to the difficulty in measuring reliable redshifts from their nearly featureless continuum-dominated optical spectra. The knowledge of the redshift is fundamental for understanding the emission from blazars, for population studies and also for indirect studies of the extragalactic background light and searches for Lorentz invariance violation and axion-like particles using blazars.Aims. This paper is the first in a series of papers that aim to measure the redshift of a sample of blazars likely to be detected with the upcoming Cherenkov Telescope Array (CTA), a ground-based gamma-ray observatory.Methods. Monte Carlo simulations were performed to select those hard spectrum gamma-ray blazars detected with the Fermi-LAT telescope still lacking redshift measurements, but likely to be detected by CTA in 30 hours of observing time or less. Optical observing campaigns involving deep imaging and spectroscopic observations were organised to efficiently constrain their redshifts. We performed deep medium- to high-resolution spectroscopy of 19 blazar optical counterparts with the Keck II, SALT, and ESO NTT telescopes. We searched systematically for spectral features and, when possible, we estimated the contribution of the host galaxy to the total flux.Results. We measured eleven firm spectroscopic redshifts with values ranging from 0.1116 to 0.482, one tentative redshift, three redshift lower limits including one at z >= 0.449 and another at z >= 0.868. Four BL Lacs show featureless spectra.
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Patrocinador
dc.description.sponsorship
National Science Foundation (NSF) PHY-1707454
Alfred P. Sloan Foundation
National Science Foundation (NSF)
United States Department of Energy (DOE)
Aparece en contenido como:US Department of Energy Office of Science
University of Arizona
Brazilian Participation Group
United States Department of Energy (DOE)
University of Cambridge
Carnegie Mellon University
University of Florida
French Participation Group
German Participation Group
Harvard University
Instituto de Astrofisica de Canarias
Michigan State/Notre Dame/JINA Participation Group
Johns Hopkins University
United States Department of Energy (DOE)
Aparece en contenido como:Lawrence Berkeley National Laboratory
Max Planck Institute for Astrophysics
Max Planck Institute for Extraterrestrial Physics
New Mexico State University
New York University
Ohio State University
Pennsylvania State University
University of Portsmouth
Princeton University
Spanish Participation Group
University of Tokyo
University of Utah
Vanderbilt University
University of Virginia
University of Washington
Yale University
ANID projects Basal AFB-170002
PAI79160080
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 11190853
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Lenguage
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en
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Publisher
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Elsevier
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Type of license
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Attribution-NonCommercial-NoDerivs 3.0 United States