MAGIC long-term study of the distant TeV blazar PKS 1424+240 in a multiwavelength context

Aleksić, J.

doi:10.1051/0004-6361/201423364

MAGIC long-term study of the distant TeV blazar PKS 1424+240 in a multiwavelength context

Journal Article · Tue Jul 01 00:00:00 EDT 2014 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201423364· OSTI ID:1356461

Aleksić, J. ^[1]

Inst. for High Energy Physics (IFAE), Bellaterra (Spain)

Aims. We present a study of the very high energy (VHE; E>100 GeV) γ-ray emission of the blazar PKS 1424+240 observed with the MAGIC telescopes. The primary aim of this paper is the multiwavelength spectral characterization and modeling of this blazar, which is made particularly interesting by the recent discovery of a lower limit of its redshift of z ≥ 0.6 and makes it a promising candidate to be the most distant VHE source. Methods. The source has been observed with the MAGIC telescopes in VHE rays for a total observation time of ~33.6 h from 2009 to 2011. A detailed analysis of its γ-ray spectrum and time evolution has been carried out. Moreover, we have collected and analyzed simultaneous and quasi-simultaneous multiwavelength data. Results. The source was marginally detected in VHE rays during 2009 and 2010, and later, the detection was confirmed during an optical outburst in 2011. The combined significance of the stacked sample is ~7.2σ. The differential spectra measured during the different campaigns can be described by steep power laws with the indices ranging from 3.5 ± 1.2 to 5.0 ± 1.7. The MAGIC spectra corrected for the absorption due to the extragalactic background light connect smoothly, within systematic errors, with the mean spectrum in 2009-2011 observed at lower energies by the Fermi-LAT. The absorption-corrected MAGIC spectrum is flat with no apparent turn down up to 400 GeV. The multiwavelength light curve shows increasing flux in radio and optical bands that could point to a common origin from the same region of the jet. The large separation between the two peaks of the constructed non-simultaneous spectral energy distribution also requires an extremely high Doppler factor if an one zone synchrotron self-Compton model is applied. We find that a two-component synchrotron self-Compton model describes the spectral energy distribution of the source well, if the source is located at z ~ 0.6.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: the MAGIC collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356461

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 567; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Journal Article · Sun Aug 31 20:00:00 EDT 2014 · Astronomy and Astrophysics · OSTI ID:1356445

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