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Deep Broadband Observations of the Distant Gamma-Ray Blazar PKS 1424+240
- Archambault, S. (author)
- Aune, T. (author)
- Behera, B. (author)
- show more...
- Beilicke, M. (author)
- Benbow, W. (author)
- Berger, K. (author)
- Bird, R. (author)
- Biteau, J. (author)
- Bugaev, V. (author)
- Byrum, K. (author)
- Cardenzana, J. V. (author)
- Cerruti, M. (author)
- Chen, X. (author)
- Ciupik, L. (author)
- Connolly, M. P. (author)
- Cui, W. (author)
- Dumm, J. (author)
- Errando, M. (author)
- Falcone, A. (author)
- Federici, S. (author)
- Feng, Q. (author)
- Finley, J. P. (author)
- Fleischhack, H. (author)
- Fortson, L. (author)
- Furniss, A. (author)
- Galante, N. (author)
- Gillanders, G. H. (author)
- Griffin, S. (author)
- Griffiths, S. T. (author)
- Grube, J. (author)
- Gyuk, G. (author)
- Hanna, D. (author)
- Holder, J. (author)
- Hughes, G. (author)
- Humensky, T. B. (author)
- Johnson, C. A. (author)
- Kaaret, P. (author)
- Kertzman, M. (author)
- Khassen, Y. (author)
- Kieda, D. (author)
- Krawczynski, H. (author)
- Krennrich, F. (author)
- Kumar, S. (author)
- Lang, M. J. (author)
- Madhavan, A. S. (author)
- Maier, G. (author)
- McCann, A. (author)
- Meagher, K. (author)
- Moriarty, P. (author)
- Mukherjee, R. (author)
- Nieto, D. (author)
- O’Faoláin de Bhróithe, A. (author)
- Ong, R. A. (author)
- Otte, A. N. (author)
- Park, N. (author)
- Pohl, M. (author)
- Popkow, A. (author)
- Quinn, J. (author)
- Ragan, K. (author)
- Rajotte, J. (author)
- Reyes, L. C. (author)
- Reynolds, P. T. (author)
- Richards, G. T. (author)
- Roache, E. (author)
- Shahinyan, K. (author)
- Staszak, D. (author)
- Telezhinsky, I. (author)
- Tucci, J. V. (author)
- Tyler, J. (author)
- Varlotta, A. (author)
- Vassiliev, V. V. (author)
- Vincent, S. (author)
- Wakely, S. P. (author)
- Weinstein, A. (author)
- Welsing, R. (author)
- Wilhelm, A. (author)
- Williams, D. A. (author)
- Collaboration, V E R I T A S (author)
- Ackermann, M. (author)
- Ajello, M. (author)
- Albert, A. (author)
- Baldini, L. (author)
- Bastieri, D. (author)
- Bellazzini, R. (author)
- Bissaldi, E. (author)
- Bregeon, J. (author)
- Buehler, R. (author)
- Buson, S. (author)
- Caliandro, G. A. (author)
- Cameron, R. A. (author)
- Caraveo, P. A. (author)
- Cavazzuti, E. (author)
- Charles, E. (author)
- Chiang, J. (author)
- Ciprini, S. (author)
- Claus, R. (author)
- Cutini, S. (author)
- D’Ammando, F. (author)
- de Angelis, A. (author)
- de Palma, F. (author)
- Dermer, C. D. (author)
- Digel, S. W. (author)
- Di Venere, L. (author)
- Drell, P. S. (author)
- Favuzzi, C. (author)
- Franckowiak, A. (author)
- Fusco, P. (author)
- Gargano, F. (author)
- Gasparrini, D. (author)
- Giglietto, N. (author)
- Giordano, F. (author)
- Giroletti, M. (author)
- Grenier, I. A. (author)
- Guiriec, S. (author)
- Jogler, T. (author)
- Kuss, M. (author)
- Latronico, L. (author)
- Longo, F. (author)
- Loparco, F. (author)
- Lubrano, P. (author)
- Madejski, G. M. (author)
- Mayer, M. (author)
- Mazziotta, M. N. (author)
- Michelson, P. F. (author)
- Mizuno, T. (author)
- Monzani, M. E. (author)
- Morselli, A. (author)
- Murgia, S. (author)
- Nuss, E. (author)
- Ohsugi, T. (author)
- Ormes, J. F. (author)
- Paneque, D. (author)
- Perkins, J. S. (author)
- Piron, F. (author)
- Pivato, G. (author)
- Rainò, S. (author)
- Razzano, M. (author)
- Reimer, A. (author)
- Reimer, O. (author)
- Ritz, S. (author)
- Schaal, M. (author)
- Sgrò, C. (author)
- Siskind, E. J. (author)
- Spinelli, P. (author)
- Takahashi, H. (author)
- Tibaldo, L. (author)
- Tinivella, M. (author)
- Troja, E. (author)
- Vianello, G. (author)
- Werner, M. (author)
- Wood, M. (author)
- Collaboration, Fermi LAT (author)
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- (creator_code:org_t)
- 2014
- 2014
- English.
- In: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 785:1
- Journal article (peer-reviewed)
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)
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- Archambault, S.
- Aune, T.
- Behera, B.
- Beilicke, M.
- Benbow, W.
- Berger, K.
- show more...
- Bird, R.
- Biteau, J.
- Bugaev, V.
- Byrum, K.
- Cardenzana, J. V ...
- Cerruti, M.
- Chen, X.
- Ciupik, L.
- Connolly, M. P.
- Cui, W.
- Dumm, J.
- Errando, M.
- Falcone, A.
- Federici, S.
- Feng, Q.
- Finley, J. P.
- Fleischhack, H.
- Fortson, L.
- Furniss, A.
- Galante, N.
- Gillanders, G. H ...
- Griffin, S.
- Griffiths, S. T.
- Grube, J.
- Gyuk, G.
- Hanna, D.
- Holder, J.
- Hughes, G.
- Humensky, T. B.
- Johnson, C. A.
- Kaaret, P.
- Kertzman, M.
- Khassen, Y.
- Kieda, D.
- Krawczynski, H.
- Krennrich, F.
- Kumar, S.
- Lang, M. J.
- Madhavan, A. S.
- Maier, G.
- McCann, A.
- Meagher, K.
- Moriarty, P.
- Mukherjee, R.
- Nieto, D.
- O’Faoláin de Bhr ...
- Ong, R. A.
- Otte, A. N.
- Park, N.
- Pohl, M.
- Popkow, A.
- Prokoph, Heike
- Quinn, J.
- Ragan, K.
- Rajotte, J.
- Reyes, L. C.
- Reynolds, P. T.
- Richards, G. T.
- Roache, E.
- Sembroski, G. H.
- Shahinyan, K.
- Staszak, D.
- Telezhinsky, I.
- Tucci, J. V.
- Tyler, J.
- Varlotta, A.
- Vassiliev, V. V.
- Vincent, S.
- Wakely, S. P.
- Weinstein, A.
- Welsing, R.
- Wilhelm, A.
- Williams, D. A.
- Collaboration, V ...
- Ackermann, M.
- Ajello, M.
- Albert, A.
- Baldini, L.
- Bastieri, D.
- Bellazzini, R.
- Bissaldi, E.
- Bregeon, J.
- Buehler, R.
- Buson, S.
- Caliandro, G. A.
- Cameron, R. A.
- Caraveo, P. A.
- Cavazzuti, E.
- Charles, E.
- Chiang, J.
- Ciprini, S.
- Claus, R.
- Cutini, S.
- D’Ammando, F.
- de Angelis, A.
- de Palma, F.
- Dermer, C. D.
- Digel, S. W.
- Di Venere, L.
- Drell, P. S.
- Favuzzi, C.
- Franckowiak, A.
- Fusco, P.
- Gargano, F.
- Gasparrini, D.
- Giglietto, N.
- Giordano, F.
- Giroletti, M.
- Grenier, I. A.
- Guiriec, S.
- Jogler, T.
- Kuss, M.
- Larsson, S.
- Latronico, L.
- Longo, F.
- Loparco, F.
- Lubrano, P.
- Madejski, G. M.
- Mayer, M.
- Mazziotta, M. N.
- Michelson, P. F.
- Mizuno, T.
- Monzani, M. E.
- Morselli, A.
- Murgia, S.
- Nuss, E.
- Ohsugi, T.
- Ormes, J. F.
- Paneque, D.
- Perkins, J. S.
- Piron, F.
- Pivato, G.
- Rainò, S.
- Razzano, M.
- Reimer, A.
- Reimer, O.
- Ritz, S.
- Schaal, M.
- Sgrò, C.
- Siskind, E. J.
- Spinelli, P.
- Takahashi, H.
- Tibaldo, L.
- Tinivella, M.
- Troja, E.
- Vianello, G.
- Werner, M.
- Wood, M.
- Collaboration, F ...
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