Journal article
Observation of Markarian 421 in TeV gamma rays over a 14-year time span
Astroparticle physics, Vol.54, pp.1-10
02/2014
DOI: 10.1016/j.astropartphys.2013.10.004
Abstract
The variability of the blazar Markarian 421 in TeV gamma rays over a 14-year time period has been explored with the Whipple 10m telescope. It is shown that the dynamic range of its flux variations is large and similar to that in X-rays. A correlation between the X-ray and TeV energy bands is observed during some bright flares and when the complete data sets are binned on long timescales. The main database consists of 878.4h of observation with the Whipple telescope, spread over 783 nights. The peak energy response of the telescope was 400GeV with 20% uncertainty. This is the largest database of any TeV-emitting active galactic nucleus (AGN) and hence was used to explore the variability profile of Markarian 421. The time-averaged flux from Markarian 421 over this period was 0.446±0.008Crab flux units. The flux exceeded 10Crab flux units on three separate occasions. For the 2000–2001 season the average flux reached 1.86Crab units, while in the 1996–1997 season the average flux was only 0.23Crab units.
Details
- Title: Subtitle
- Observation of Markarian 421 in TeV gamma rays over a 14-year time span
- Creators
- V.A Acciari - Harvard UniversityT Arlen - University of California, Los AngelesT Aune - University of California, Santa CruzA Smith - University of UtahW Benbow - Harvard UniversityR Bird - University College DublinA Bouvier - University of California, Santa CruzS.M Bradbury - University of LeedsJ.H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. LouisI de la Calle Perez - European Space Astronomy Center, 28080 Villafranca del Castillo, Madrid, SpainD.A Carter-Lewis - Iowa State UniversityA Cesarini - Ollscoil na Gaillimhe – University of GalwayL Ciupik - Adler PlanetariumE Collins-Hughes - University College DublinM.P Connolly - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteC Duke - Grinnell CollegeJ Dumm - University of MinnesotaA Falcone - Pennsylvania State UniversityS Federici - University of PotsdamD.J Fegan - University College DublinS.J Fegan - École PolytechniqueJ.P Finley - Purdue University West LafayetteG Finnegan - University of UtahL Fortson - University of MinnesotaJ Gaidos - Purdue University West LafayetteN Galante - Harvard UniversityD Gall - University of IowaK Gibbs - Harvard UniversityG.H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Griffin - McGill UniversityJ Grube - Adler PlanetariumG Gyuk - Adler PlanetariumD Hanna - McGill UniversityD Horan - École PolytechniqueT.B Humensky - Columbia UniversityY Khassen - University College DublinP Kaaret - University of IowaM Kertzman - DePauw UniversityD Kieda - University of UtahH Krawczynski - Washington University in St. LouisF Krennrich - Iowa State UniversityM.J Lang - Ollscoil na Gaillimhe – University of GalwayJ.E McEnery - University of Maryland, College ParkA.S Madhavan - Iowa State UniversityP Moriarty - Galway-Mayo Institute of TechnologyT Nelson - University of MinnesotaA O’Faoláin de Bhróithe - University College DublinR.A Ong - University of California, Los AngelesM Orr - Iowa State UniversityA.N Otte - Georgia Institute of TechnologyJ.S Perkins - University of Maryland, Baltimore CountyD Petry - European Southern ObservatoryA Pichel - Universidad de Buenos AiresM Pohl - University of PotsdamJ Quinn - University College DublinK Ragan - McGill UniversityT Reynolds - Cork Institute of TechnologyE Roache - Harvard UniversityA Rovero - Universidad de Buenos AiresM Schroedter - Harvard UniversityG.H Sembroski - Purdue University West LafayetteI Telezhinsky - University of PotsdamM Theiling - Purdue University West LafayetteJ Toner - Ollscoil na Gaillimhe – University of GalwayJ Tyler - McGill UniversityA Varlotta - Purdue University West LafayetteM Vivier - University of DelawareS.P Wakely - University of ChicagoJ.E Ward - Washington University in St. LouisT.C Weekes - Harvard UniversityA Weinstein - Iowa State UniversityR Welsing - University of PotsdamD.A Williams - University of California, Santa CruzS Wissel - University of California, Los Angeles
- Resource Type
- Journal article
- Publication Details
- Astroparticle physics, Vol.54, pp.1-10
- DOI
- 10.1016/j.astropartphys.2013.10.004
- ISSN
- 0927-6505
- eISSN
- 1873-2852
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 02/2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199792802771
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