Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift

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We report the first detection of very high energy 83 Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8...

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Autor principal:	Acciari, V.A.
Formato:	JOUR
Materias:	Gamma rays: observations
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_20418205_v708_n2PART2_pL100_Acciari
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_20418205_v708_n2PART2_pL100_Acciari
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spelling	todo:paper_20418205_v708_n2PART2_pL100_Acciari2023-10-03T16:37:58Z Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift Acciari, V.A. Gamma rays: observations We report the first detection of very high energy 83 Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8 0.5 stat 0.3 syst and a flux normalization at 200 GeV of (5.1 0.9 stat 0.5 syst ) × 10 -11 TeV -1 cm -2 s -1 , where stat and syst denote the statistical and systematical uncertainties, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (from 2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high-energy observations with the Fermi Large Area Telescope. Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution is well described by a one-zone synchrotron self-Compton model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66. © 2010. The American Astronomical Society. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20418205_v708_n2PART2_pL100_Acciari
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Gamma rays: observations
spellingShingle	Gamma rays: observations Acciari, V.A. Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
topic_facet	Gamma rays: observations
description	We report the first detection of very high energy 83 Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8 0.5 stat 0.3 syst and a flux normalization at 200 GeV of (5.1 0.9 stat 0.5 syst ) × 10 -11 TeV -1 cm -2 s -1 , where stat and syst denote the statistical and systematical uncertainties, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (from 2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high-energy observations with the Fermi Large Area Telescope. Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution is well described by a one-zone synchrotron self-Compton model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66. © 2010. The American Astronomical Society. All rights reserved.
format	JOUR
author	Acciari, V.A.
author_facet	Acciari, V.A.
author_sort	Acciari, V.A.
title	Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
title_short	Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
title_full	Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
title_fullStr	Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
title_full_unstemmed	Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
title_sort	discovery of very high energy gamma rays from pks 1424+240 and multiwavelength constraints on its redshift
url	http://hdl.handle.net/20.500.12110/paper_20418205_v708_n2PART2_pL100_Acciari
work_keys_str_mv	AT acciariva discoveryofveryhighenergygammaraysfrompks1424240andmultiwavelengthconstraintsonitsredshift
_version_	1782028111004565504

Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift

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