Journal article
TeV AND MULTI-WAVELENGTH OBSERVATIONS OF Mrk 421 IN 2006-2008
The Astrophysical journal, Vol.738(1), p.25
2011
DOI: 10.1088/0004-637X/738/1/25
Abstract
We report on TeV γ-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10 m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV γ-ray fluxes and energy spectra with unprecedented accuracy where Mrk 421 was detected in each of the pointings. A total of 47.3 hr of VERITAS and 96 hr of Whipple 10 m data were acquired between 2006 January and 2008 June. We present the results of a study of the TeV γ-ray energy spectra as a function of time and for different flux levels. On 2008 May 2 and 3, bright TeV γ-ray flares were detected with fluxes reaching the level of 10 Crab. The TeV γ-ray data were complemented with radio, optical, and X-ray observations, with flux variability found in all bands except for the radio wave band. The combination of the Rossi X-ray Timing Explorer and Swift X-ray data reveal spectral hardening with increasing flux levels, often correlated with an increase of the source activity in TeV γ-rays. Contemporaneous spectral energy distributions were generated for 18 nights, each of which are reasonably described by a one-zone synchrotron self-Compton model.
Details
- Title: Subtitle
- TeV AND MULTI-WAVELENGTH OBSERVATIONS OF Mrk 421 IN 2006-2008
- Creators
- V. A Acciari - Harvard UniversityE Aliu - Columbia UniversityK Byrum - Argonne National LaboratoryA Cannon - University College DublinA Cesarini - Ollscoil na Gaillimhe – University of GalwayL Ciupik - Adler PlanetariumW Cui - Purdue University West LafayetteR Dickherber - Washington University in St. LouisC Duke - Grinnell CollegeA Falcone - Pennsylvania State UniversityJ. P Finley - Purdue University West LafayetteG Finnegan - University of UtahT Arlen - University of California, Los AngelesL Fortson - Adler PlanetariumA Furniss - University of California, Santa CruzN Galante - Harvard UniversityD Gall - University of IowaG. H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Godambe - University of UtahJ Grube - Adler PlanetariumR Guenette - McGill UniversityG Gyuk - Adler PlanetariumD Hanna - McGill UniversityT Aune - University of California, Santa CruzJ Holder - University of DelawareC. M Hui - University of UtahT. B Humensky - University of ChicagoA Imran - Iowa State UniversityP Kaaret - University of IowaN Karlsson - Adler PlanetariumM Kertzman - DePauw UniversityD Kieda - University of UtahA Konopelko - Pittsburg State UniversityH Krawczynski - Washington University in St. LouisM Beilicke - Washington University in St. LouisF Krennrich - Iowa State UniversityM. J Lang - Ollscoil na Gaillimhe – University of GalwayG Maier - McGill UniversityS Mcarthur - Washington University in St. LouisM Mccutcheon - McGill UniversityP Moriarty - Galway-Mayo Institute of TechnologyR. A Ong - University of California, Los AngelesA. N Otte - University of California, Santa CruzM Ouellette - California Polytechnic State UniversityD Pandel - University of IowaW Benbow - Harvard UniversityJ. S Perkins - Harvard UniversityA Pichel - CIUDADM Pohl - Iowa State UniversityJ Quinn - University College DublinK Ragan - McGill UniversityL. C Reyes - University of ChicagoP. T Reynolds - Cork Institute of TechnologyE Roache - Harvard UniversityH. J Rose - University of LeedsA. C Rovero - CIUDADD Boltuch - University of DelawareS. M Bradbury - University of LeedsJ. H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. Louis
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.738(1), p.25
- DOI
- 10.1088/0004-637X/738/1/25
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Language
- English
- Date published
- 2011
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199770102771
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