Journal article
Discovery of very high energy gamma rays from 1ES 1440+122
Monthly notices of the Royal Astronomical Society, v 461(1), pp 202-208
01 Sep 2016
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Abstract
The BL Lacertae object 1ES 1440+ 122 was observed in the energy range from 85 GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes. The observations, taken between 2008 May and 2010 June and totalling 53 h, resulted in the discovery of gamma-ray emission from the blazar, which has a redshift z = 0.163. 1ES 1440+ 122 is detected at a statistical significance of 5.5 standard deviations above the background with an integral flux of (2.8 +/- 0.7(stat) +/- 0.8sys) x 10(-12) cm(-2) s(-1) (1.2 per cent of the Crab Nebula's flux) above 200 GeV. The measured spectrum is described well by a power law from 0.2 to 1.3 TeV with a photon index of 3.1 +/- 0.4(stat) +/- 0.2(sys). Quasi-simultaneous multiwavelength data from the Fermi Large Area Telescope (0.3-300 GeV) and the Swift X-ray Telescope (0.2-10 keV) are additionally used to model the properties of the emission region. A synchrotron self-Compton model produces a good representation of the multiwavelength data. Adding an external-Compton or a hadronic component also adequately describes the data.
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Details
- Title
- Discovery of very high energy gamma rays from 1ES 1440+122
- Creators
- S. Archambault - McGill UniversityA. Archer - Washington University in St. LouisA. Barnacka - Harvard UniversityB. Behera - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM. Beilicke - Washington University in St. LouisW. Benbow - Harvard UniversityK. Berger - University of DelawareR. Bird - University College DublinM. Bottcher - North-West UniversityJ. H. Buckley - Washington University in St. LouisV. Bugaev - Washington University in St. LouisJ. V. Cardenzana - Iowa State UniversityM. Cerruti - Harvard UniversityX. Chen - University of PotsdamJ. L. Christiansen - California Polytechnic State UniversityL. Ciupik - Adler PlanetariumE. Collins-Hughes - University College DublinM. P. Connolly - National University of Ireland, GalwayW. Cui - Purdue University West LafayetteH. J. Dickinson - Iowa State UniversityJ. Dumm - University of MinnesotaJ. D. Eisch - Iowa State UniversityM. Errando - Columbia UniversityA. Falcone - Pennsylvania State UniversityS. Federici - University of PotsdamQ. Feng - Purdue University West LafayetteJ. P. Finley - Purdue University West LafayetteH. Fleischhack - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyL. Fortson - University of MinnesotaA. Furniss - University of California, Santa CruzG. H. Gillanders - National University of Ireland, GalwayS. Godambe - Bhabha Atomic Research CentreS. Griffin - McGill UniversityS. T. Griffiths - University of IowaJ. Grube - Adler PlanetariumG. Gyuk - Adler PlanetariumN. Hakansson - University of PotsdamD. Hanna - McGill UniversityJ. Holder - University of DelawareG. Hughes - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyC. A. Johnson - University of California, Santa CruzP. Kaaret - University of IowaP. Kar - University of UtahM. Kertzman - DePauw UniversityY. Khassen - University College DublinD. Kieda - University of UtahH. Krawczynski - Washington University in St. LouisS. Kumar - University of DelawareM. J. Lang - National University of Ireland, GalwayA. S. Madhavan - Iowa State UniversityG. Maier - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyS. McArthur - University of ChicagoA. McCann - University of ChicagoK. Meagher - Georgia Institute of TechnologyJ. Millis - Anderson University - South CarolinaP. Moriarty - Galway-Mayo Institute of TechnologyT. Nelson - Supreme Council Of HealthD. Nieto - Columbia UniversityA. O'Faolain de Bhroithe - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyR. A. Ong - University of California, Los AngelesA. N. Otte - Georgia Institute of TechnologyN. Park - University of ChicagoJ. S. Perkins - Goddard Space Flight CenterM. Pohl - University of PotsdamA. Popkow - University of California, Los AngelesH. Prokoph - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyE. Pueschel - University College DublinJ. Quinn - University College DublinK. Ragan - McGill UniversityJ. Rajotte - McGill UniversityL. C. Reyes - California Polytechnic State UniversityP. T. Reynolds - Cork Institute of TechnologyG. T. Richards - Georgia Institute of TechnologyE. Roache - Harvard UniversityG. H. Sembroski - Purdue University West LafayetteK. Shahinyan - University of MinnesotaA. W. Smith - University of UtahD. Staszak - McGill UniversityK. Sweeney - Ohio University - LancasterI. Telezhinsky - University of PotsdamJ. V. Tucci - Purdue University West LafayetteJ. Tyler - McGill UniversityA. Varlotta - Purdue University West LafayetteV. V. Vassiliev - University of California, Los AngelesS. P. Wakely - University of ChicagoR. Welsing - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyA. Wilhelm - University of PotsdamD. A. Williams - University of California, Santa CruzB. Zitzer - Argonne National Laboratory
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 461(1), pp 202-208
- Publisher
- Oxford Univ Press
- Number of pages
- 7
- Grant note
- US Department of Energy Office of Science; United States Department of Energy (DOE) STFC in the UK; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NSERC in Canada; Natural Sciences and Engineering Research Council of Canada (NSERC) SFI 10/RFP/AST2748 / Science Foundation Ireland; European Commission 1510504 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) 1506140 / Division Of Physics; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) US National Science Foundation; National Science Foundation (NSF) Smithsonian Institution 64789 / South African Department of Science and Technology through the National Research Foundation under NRF SARChI Chair
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000383272500017
- Scopus ID
- 2-s2.0-84988810612
- Other Identifier
- 991019201495904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics