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Abstract:

We report on TeV γ-ray observations of the blazar Mrk421 (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 Mrk421 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. © 2011. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:TeV and multi-wavelength observations of Mrk421 in 2006-2008
Autor:Acciari, V.A. et al.
Este artículo contiene 106 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 106 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave:BL Lacertae objects: individual (Mrk 421); galaxies: jets; galaxies: nuclei; gamma rays: galaxies; X-rays: galaxies
Año:2011
Volumen:738
Número:1
DOI: http://dx.doi.org/10.1088/0004-637X/738/1/25
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v738_n1_p_Acciari

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Citas:

---------- APA ----------
(2011) . TeV and multi-wavelength observations of Mrk421 in 2006-2008. Astrophysical Journal, 738(1).
http://dx.doi.org/10.1088/0004-637X/738/1/25
---------- CHICAGO ----------
Acciari, V.A. "TeV and multi-wavelength observations of Mrk421 in 2006-2008" . Astrophysical Journal 738, no. 1 (2011).
http://dx.doi.org/10.1088/0004-637X/738/1/25
---------- MLA ----------
Acciari, V.A. "TeV and multi-wavelength observations of Mrk421 in 2006-2008" . Astrophysical Journal, vol. 738, no. 1, 2011.
http://dx.doi.org/10.1088/0004-637X/738/1/25
---------- VANCOUVER ----------
Acciari, V.A. TeV and multi-wavelength observations of Mrk421 in 2006-2008. Astrophys. J. 2011;738(1).
http://dx.doi.org/10.1088/0004-637X/738/1/25