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Deep Broadband Obse...
Deep Broadband Observations of the Distant Gamma-Ray Blazar PKS 1424+240
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Archambault, S. (author)
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Aune, T. (author)
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Behera, B. (author)
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show more...
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Beilicke, M. (author)
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Benbow, W. (author)
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Berger, K. (author)
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Bird, R. (author)
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Biteau, J. (author)
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Bugaev, V. (author)
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Byrum, K. (author)
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Cardenzana, J. V. (author)
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Cerruti, M. (author)
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Chen, X. (author)
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Ciupik, L. (author)
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Connolly, M. P. (author)
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Cui, W. (author)
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Dumm, J. (author)
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Errando, M. (author)
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Falcone, A. (author)
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Federici, S. (author)
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Feng, Q. (author)
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Finley, J. P. (author)
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Fleischhack, H. (author)
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Fortson, L. (author)
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Furniss, A. (author)
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Galante, N. (author)
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Gillanders, G. H. (author)
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Griffin, S. (author)
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Griffiths, S. T. (author)
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Grube, J. (author)
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Gyuk, G. (author)
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Hanna, D. (author)
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Holder, J. (author)
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Hughes, G. (author)
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Humensky, T. B. (author)
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Johnson, C. A. (author)
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Kaaret, P. (author)
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Kertzman, M. (author)
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Khassen, Y. (author)
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Kieda, D. (author)
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Krawczynski, H. (author)
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Krennrich, F. (author)
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Kumar, S. (author)
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Lang, M. J. (author)
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Madhavan, A. S. (author)
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Maier, G. (author)
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McCann, A. (author)
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Meagher, K. (author)
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Moriarty, P. (author)
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Mukherjee, R. (author)
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Nieto, D. (author)
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O’Faoláin de Bhróithe, A. (author)
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Ong, R. A. (author)
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Otte, A. N. (author)
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Park, N. (author)
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Pohl, M. (author)
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Popkow, A. (author)
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- Prokoph, Heike (author)
- DESY, Germany
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Quinn, J. (author)
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Ragan, K. (author)
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Rajotte, J. (author)
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Reyes, L. C. (author)
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Reynolds, P. T. (author)
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Richards, G. T. (author)
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Roache, E. (author)
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- Sembroski, G. H. (author)
- Stockholms universitet,Fysikum
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Shahinyan, K. (author)
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Staszak, D. (author)
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Telezhinsky, I. (author)
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Tucci, J. V. (author)
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Tyler, J. (author)
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Varlotta, A. (author)
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Vassiliev, V. V. (author)
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Vincent, S. (author)
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Wakely, S. P. (author)
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Weinstein, A. (author)
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Welsing, R. (author)
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Wilhelm, A. (author)
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Williams, D. A. (author)
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Collaboration, V E R I T A S (author)
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Ackermann, M. (author)
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Ajello, M. (author)
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Albert, A. (author)
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Baldini, L. (author)
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Bastieri, D. (author)
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Bellazzini, R. (author)
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Bissaldi, E. (author)
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Bregeon, J. (author)
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Buehler, R. (author)
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Buson, S. (author)
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Caliandro, G. A. (author)
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Cameron, R. A. (author)
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Caraveo, P. A. (author)
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Cavazzuti, E. (author)
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Charles, E. (author)
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Chiang, J. (author)
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Ciprini, S. (author)
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Claus, R. (author)
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Cutini, S. (author)
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D’Ammando, F. (author)
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de Angelis, A. (author)
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de Palma, F. (author)
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Dermer, C. D. (author)
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Digel, S. W. (author)
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Di Venere, L. (author)
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Drell, P. S. (author)
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Favuzzi, C. (author)
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Franckowiak, A. (author)
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Fusco, P. (author)
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Gargano, F. (author)
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Gasparrini, D. (author)
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Giglietto, N. (author)
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Giordano, F. (author)
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Giroletti, M. (author)
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Grenier, I. A. (author)
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Guiriec, S. (author)
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Jogler, T. (author)
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Kuss, M. (author)
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- Larsson, S. (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Latronico, L. (author)
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Longo, F. (author)
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Loparco, F. (author)
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Lubrano, P. (author)
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Madejski, G. M. (author)
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Mayer, M. (author)
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Mazziotta, M. N. (author)
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Michelson, P. F. (author)
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Mizuno, T. (author)
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Monzani, M. E. (author)
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Morselli, A. (author)
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Murgia, S. (author)
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Nuss, E. (author)
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Ohsugi, T. (author)
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Ormes, J. F. (author)
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Paneque, D. (author)
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Perkins, J. S. (author)
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Piron, F. (author)
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Pivato, G. (author)
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Rainò, S. (author)
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Razzano, M. (author)
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Reimer, A. (author)
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Reimer, O. (author)
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Ritz, S. (author)
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Schaal, M. (author)
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Sgrò, C. (author)
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Siskind, E. J. (author)
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Spinelli, P. (author)
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Takahashi, H. (author)
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Tibaldo, L. (author)
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Tinivella, M. (author)
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Troja, E. (author)
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Vianello, G. (author)
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Werner, M. (author)
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Wood, M. (author)
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Collaboration, Fermi LAT (author)
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 785:1
- Related links:
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https://arxiv.org/ab...
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show more...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
Close
- We present deep VERITAS observations of the blazar PKS 1424+240, along with contemporaneous Fermi Large Area Telescope, Swift X-ray Telescope, and Swift UV Optical Telescope data between 2009 February 19 and 2013 June 8. This blazar resides at a redshift of z ≥ 0.6035, displaying a significantly attenuated gamma-ray flux above 100 GeV due to photon absorption via pair-production with the extragalactic background light. We present more than 100 hr of VERITAS observations over three years, a multiwavelength light curve, and the contemporaneous spectral energy distributions. The source shows a higher flux of (2.1 ± 0.3) × 10–7 photons m–2 s–1 above 120 GeV in 2009 and 2011 as compared to the flux measured in 2013, corresponding to (1.02 ± 0.08) × 10–7 photons m–2 s–1 above 120 GeV. The measured differential very high energy (VHE; E ≥ 100 GeV) spectral indices are Γ = 3.8 ± 0.3, 4.3 ± 0.6 and 4.5 ± 0.2 in 2009, 2011, and 2013, respectively. No significant spectral change across the observation epochs is detected. We find no evidence for variability at gamma-ray opacities of greater than τ = 2, where it is postulated that any variability would be small and occur on timescales longer than a year if hadronic cosmic-ray interactions with extragalactic photon fields provide a secondary VHE photon flux. The data cannot rule out such variability due to low statistics.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- BL Lacertae objects: individual (PKS 1424+240)-cosmic background radiation
- gamma rays: galaxies
- Astropartikelfysik
- Astroparticle Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
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Archambault, S.
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Aune, T.
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Behera, B.
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Beilicke, M.
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Benbow, W.
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Berger, K.
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show more...
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Bird, R.
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Biteau, J.
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Bugaev, V.
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Byrum, K.
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Cardenzana, J. V ...
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Cerruti, M.
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Chen, X.
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Ciupik, L.
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Connolly, M. P.
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Cui, W.
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Dumm, J.
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Errando, M.
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Falcone, A.
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Federici, S.
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Feng, Q.
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Finley, J. P.
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Fleischhack, H.
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Fortson, L.
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Furniss, A.
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Galante, N.
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Gillanders, G. H ...
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Griffin, S.
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Griffiths, S. T.
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Grube, J.
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Gyuk, G.
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Hanna, D.
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Holder, J.
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Hughes, G.
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Humensky, T. B.
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Johnson, C. A.
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Kaaret, P.
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Kertzman, M.
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Khassen, Y.
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Kieda, D.
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Krawczynski, H.
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Krennrich, F.
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Kumar, S.
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Lang, M. J.
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Madhavan, A. S.
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Maier, G.
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McCann, A.
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Meagher, K.
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Moriarty, P.
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Mukherjee, R.
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Nieto, D.
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O’Faoláin de Bhr ...
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Ong, R. A.
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Otte, A. N.
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Park, N.
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Pohl, M.
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Popkow, A.
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Prokoph, Heike
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Quinn, J.
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Ragan, K.
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Rajotte, J.
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Reyes, L. C.
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Reynolds, P. T.
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Richards, G. T.
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Roache, E.
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Sembroski, G. H.
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Shahinyan, K.
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Staszak, D.
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Telezhinsky, I.
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Tucci, J. V.
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Tyler, J.
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Varlotta, A.
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Vassiliev, V. V.
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Vincent, S.
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Wakely, S. P.
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Weinstein, A.
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Welsing, R.
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Wilhelm, A.
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Williams, D. A.
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Collaboration, V ...
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Ackermann, M.
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Ajello, M.
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Albert, A.
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Baldini, L.
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Bastieri, D.
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Bellazzini, R.
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Bissaldi, E.
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Bregeon, J.
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Buehler, R.
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Buson, S.
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Caliandro, G. A.
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Cameron, R. A.
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Caraveo, P. A.
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Cavazzuti, E.
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Charles, E.
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Chiang, J.
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Ciprini, S.
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Claus, R.
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Cutini, S.
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D’Ammando, F.
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de Angelis, A.
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de Palma, F.
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Dermer, C. D.
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Digel, S. W.
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Di Venere, L.
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Drell, P. S.
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Favuzzi, C.
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Franckowiak, A.
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Fusco, P.
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Gargano, F.
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Gasparrini, D.
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Giglietto, N.
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Giordano, F.
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Giroletti, M.
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Grenier, I. A.
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Guiriec, S.
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Jogler, T.
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Kuss, M.
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Larsson, S.
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Latronico, L.
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Longo, F.
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Loparco, F.
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Lubrano, P.
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Madejski, G. M.
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Mayer, M.
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Mazziotta, M. N.
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Michelson, P. F.
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Mizuno, T.
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Monzani, M. E.
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Morselli, A.
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Murgia, S.
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Nuss, E.
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Ohsugi, T.
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Ormes, J. F.
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Paneque, D.
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Perkins, J. S.
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Piron, F.
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Pivato, G.
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Rainò, S.
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Razzano, M.
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Reimer, A.
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Reimer, O.
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Ritz, S.
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Schaal, M.
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Sgrò, C.
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Siskind, E. J.
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Spinelli, P.
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Takahashi, H.
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Tibaldo, L.
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Tinivella, M.
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Troja, E.
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Vianello, G.
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Werner, M.
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Wood, M.
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Collaboration, F ...
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NATURAL SCIENCES
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Linnaeus University
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Stockholm University