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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. © 2016 ESO.

Registro:

Documento: Artículo
Título:Very high energy outburst of Markarian 501 in May 2009
Autor:Aliu, E. et al.
Este artículo contiene 111 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 111 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:BL Lacertae objects: individual: Mrk 501; Gamma rays: galaxies; Polarization; BL Lacertae objects; Crab nebula; Gamma rays: galaxies; Multi-wavelength campaigns; Polarization angle; Quiescent state; Spectral variability; Very high energies; Gamma rays
Año:2016
Volumen:594
DOI: http://dx.doi.org/10.1051/0004-6361/201628744
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v594_n_p_Aliu

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Citas:

---------- APA ----------
(2016) . Very high energy outburst of Markarian 501 in May 2009. Astronomy and Astrophysics, 594.
http://dx.doi.org/10.1051/0004-6361/201628744
---------- CHICAGO ----------
Aliu, E. "Very high energy outburst of Markarian 501 in May 2009" . Astronomy and Astrophysics 594 (2016).
http://dx.doi.org/10.1051/0004-6361/201628744
---------- MLA ----------
Aliu, E. "Very high energy outburst of Markarian 501 in May 2009" . Astronomy and Astrophysics, vol. 594, 2016.
http://dx.doi.org/10.1051/0004-6361/201628744
---------- VANCOUVER ----------
Aliu, E. Very high energy outburst of Markarian 501 in May 2009. Astron. Astrophys. 2016;594.
http://dx.doi.org/10.1051/0004-6361/201628744