INSIGHTS INTO THE HIGH-ENERGY γ-RAY EMISSION OF MARKARIAN 501 FROM EXTENSIVE MULTIFREQUENCY OBSERVATIONS IN THE FERMI ERA
- A. Abdo, M. Ackermann, A. Zook
- Physics
- 1 February 2011
We report on the γ-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average Large Area Telescope (LAT) γ-ray spectrum of Mrk 501 can be well described…
VERITAS OBSERVATIONS OF THE BL LAC OBJECT 1ES 1218+304
- V. Acciari, E. Aliu, B. Zitzer
- Physics
- 1 October 2008
The VERITAS collaboration reports the detection of very-high-energy gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z = 0.182. A gamma-ray signal…
DISCOVERY OF VERY HIGH ENERGY GAMMA RAYS FROM PKS 1424+240 AND MULTIWAVELENGTH CONSTRAINTS ON ITS REDSHIFT
- V. Acciari, E. Aliu, D. Terndrup
- Physics
- 3 December 2009
We report the first detection of very high energy8383 Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon…
SPATIALLY RESOLVING THE VERY HIGH ENERGY EMISSION FROM MGRO J2019+37 WITH VERITAS
We present very high energy (VHE) imaging of MGRO J2019+37 obtained with the VERITAS observatory. The bright extended (∼2°) unidentified Milagro source is located toward the rich star formation…
FIRST NuSTAR OBSERVATIONS OF MRK 501 WITHIN A RADIO TO TeV MULTI-INSTRUMENT CAMPAIGN
- A. Furniss, K. Noda, M. Villata
- Physics
- 16 September 2015
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak…
The 2009 multiwavelength campaign on Mrk 421: variability and correlation studies
- M. C. J. Aleksi'c, S. Ansoldi, 40129 Bologna
- Physics
- 9 February 2015
Aims. We perform an extensive characterization of the broadband emission of Mrk 421, as well as its temporal evolution, during the non-flaring (low) state. The high brightness and nearby location (z…
THE JUNE 2008 FLARE OF MARKARIAN 421 FROM OPTICAL TO TeV ENERGIES
- I. Donnarumma, V. Vittorini, B. Zitzer
- Physics
- 8 December 2008
We present optical, X-ray, high-energy (⪅30 GeV) and very high energy (⪆100 GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high-energy…
VERITAS OBSERVATIONS OF THE BL LAC OBJECT PG 1553+113
We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described…
MULTIWAVELENGTH OBSERVATIONS OF LS I +61° 303 WITH VERITAS, SWIFT, AND RXTE
- V. Acciari, E. Aliu, B. Zitzer
- Physics
- 28 April 2009
We present results from a long-term monitoring campaign on the TeV binary LSI +61° 303 with VERITAS at energies above 500 GeV, and in the 2–10 keV hard X-ray bands with RXTE and Swift, sampling nine…
Extreme HBL behavior of Markarian 501 during 2012
- M. L. Ahnen, S. Ansoldi, Boston University
- PhysicsAstronomy & Astrophysics
- 13 August 2018
Aims. We aim to characterize the multiwavelength emission from Markarian 501 (Mrk 501), quantify the energy-dependent variability, study the potential multiband correlations, and describe the…
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