Journal article
Very high energy outburst of Markarian 501 in May 2009
Astronomy and astrophysics (Berlin), Vol.594, p.A76
01/01/2016
DOI: 10.1051/0004-6361/201628744
Abstract
The very high energy (VHE; E> 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54 938–54 956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE γ-ray activity was detected on May 1st with Whipple and VERITAS, when the flux (E> 400 GeV) increased to 10 times the pre-flare baseline flux (3.9 × 10$^{-11}$ ph cm$^{-2}$ s$^{-1}$), reaching five times the flux of the Crab Nebula. This coincided with a decrease in the optical polarization and a rotation of the polarization angle by 15°. This VHE flare showed a fast flux variation with an increase of a factor ~4 in 25 min, and a falling time of ~50 min. We present the observations of the quiescent state previous to the flare and of the high state after the flare, focusing on the flux and spectral variability from Whipple, VERITAS, Fermi-LAT, RXTE, and Swift combined with optical and radio data.
Details
- Title: Subtitle
- Very high energy outburst of Markarian 501 in May 2009
- Creators
- E Aliu - Columbia UniversityS Archambault - McGill UniversityR Bird - University College DublinO. M Weiner - Columbia UniversityA Weinstein - Iowa State UniversityR WelsingAlina Wilhelm - University of PotsdamD. A Williams - Santa Cruz Institute for Particle PhysicsB Zitzer - University of Maryland, College ParkM. G Baring - Rice UniversityJ Becerra GónzalezA. N Cillis - Goddard Space Flight CenterD Horan - École PolytechniqueM Böttcher - North-West UniversityD Paneque - Max Planck SocietyA Bouvier - Santa Cruz Institute for Particle PhysicsM Buchovecky - University of California, Los AngelesJ. H Buckley - Washington University in St. LouisV Bugaev - Washington University in St. LouisJ. V Cardenzana - Iowa State UniversityM Cerruti - Harvard UniversityA Cesarini - Ollscoil na Gaillimhe – University of GalwayXuhui Chen - University of PotsdamA Archer - Washington University in St. LouisL Ciupik - Adler PlanetariumE Collins-HughesM. P Connolly - Ollscoil na Gaillimhe – University of GalwayW Cui - Purdue University West LafayetteJ Dumm - University of MinnesotaJ. D Eisch - Iowa State UniversityA Falcone - Pennsylvania State UniversityS Federici - University of PotsdamQ Feng - Purdue University West LafayetteJ. P Finley - Purdue University West LafayetteT Arlen - University of California, Los AngelesH FleischhackP Fortin - Harvard UniversityL Fortson - University of MinnesotaA Furniss - California State University, East BayN Galante - Harvard UniversityD Gall - University of IowaG. H Gillanders - Ollscoil na Gaillimhe – University of GalwayS Griffin - McGill UniversityS. T Griffiths - University of IowaJ Grube - Adler PlanetariumT Aune - University of California, Los AngelesG Gyuk - Adler PlanetariumM HüttenN Håkansson - University of PotsdamJ Holder - University of DelawareGreg HughesT. B Humensky - Columbia UniversityC. A Johnson - Santa Cruz Institute for Particle PhysicsP Kaaret - University of IowaP Kar - University of UtahN Kelley-HoskinsA Barnacka - Harvard UniversityM Kertzman - DePauw UniversityY Khassen - University College DublinD Kieda - University of UtahM KrauseH Krawczynski - Washington University in St. LouisF Krennrich - Iowa State UniversityM. J Lang - Ollscoil na Gaillimhe – University of GalwayA. S Madhavan - Iowa State UniversityG MaierS Mcarthur - Purdue University West LafayetteB BeheraA Mccann - McGill UniversityK Meagher - Georgia Institute of TechnologyJ Millis - Anderson University - IndianaP Moriarty - Galway-Mayo Institute of TechnologyR Mukherjee - Columbia UniversityD Nieto - Columbia UniversityA O’faoláin BhróitheR. A Ong - University of California, Los AngelesM Orr - Iowa State UniversityA. N Otte - Georgia Institute of TechnologyM Beilicke - Washington University in St. LouisD Pandel - Grand Valley State UniversityN Park - University of ChicagoV Pelassa - Harvard UniversityJ. S Perkins - Goddard Space Flight CenterA PichelMartin Pohl - University of PotsdamA Popkow - University of California, Los AngelesJ Quinn - University College DublinK Ragan - McGill UniversityL. C Reyes - California Polytechnic State UniversityW Benbow - Harvard UniversityP. T Reynolds - Cork Institute of TechnologyE Roache - Harvard UniversityJ Rousselle - University of California, Los AngelesA. C RoveroD. B Saxon - University of DelawareG. H Sembroski - Purdue University West LafayetteK Shahinyan - University of MinnesotaF Sheidaei - University of UtahC SkoleK Berger - University of DelawareA. W Smith - Argonne National LaboratoryD Staszak - University of ChicagoI Telezhinsky - University of PotsdamM Theiling - Purdue University West LafayetteN. W Todd - Washington University in St. LouisJ. V Tucci - Purdue University West LafayetteJ Tyler - McGill UniversityA Varlotta - Purdue University West LafayetteV. V Vassiliev - University of California, Los AngelesS VincentS. P Wakely - University of ChicagoVeritas Collaboration
- Resource Type
- Journal article
- Publication Details
- Astronomy and astrophysics (Berlin), Vol.594, p.A76
- DOI
- 10.1051/0004-6361/201628744
- ISSN
- 1432-0746
- eISSN
- 1432-0746
- Publisher
- EDP Sciences
- Language
- English
- Date published
- 01/01/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984200050902771
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