Veritas Observations of the BL LAC Object PG 1553+113

Aliu, E.; Gillanders, G. H.; Meagher, K.; Vassiliev, V. V.; Perkins, J. S.; Weinstein, A.; Kumar, S.; Aune, T.; McArthur, S.; Humensky, T. B.; Dumm, J.; Williams, D. A.; Bird, R.; Hughes, Gareth; Fortin, P.; Reyes, L. C.; Barnacka, A.; Rajotte, J.; Griffiths, S. T.; Hanna, D.; Pueschel, E.; Kieda, D.; Kaaret, P.; Eisch, J. D.; Behera, B.; Finley, J. P.; Prokoph, H.; Ragan, K.; Galante, N.; Archer, A.; Chen, X.; Benbow, W.; Otte, A. N.; Errando, M.; Reynolds, P. T.; Griffin, S.; Berger, K.; Quinn, J.; Richards, G. T.; Holder, J.; Kertzman, M.; Connolly, M. P.; McCann, A.; Johnson, C. A.; Sembroski, G. H.; Gyuk, G.; Shahinyan, K.; Roache, E.; Byrum, K.; Nieto, D.; Dickinson, H. J.; Zitzer, B.; Wilhelm, Alina; Moriarty, P.; Grube, J.; Buckley, J. H.; Beilicke, M.; Ong, R. A.; Cui, W.; Madhavan, A.; Staszak, D.; Krawczynski, H.; Lang, M. J.; Håkansson, N.; Bugaev, V.; Wakely, S. P.; Millis, J.; Welsing, R.; Tucci, J. V.; Park, N.; Fortson, L.; Furniss, A.; Feng, Q.; Telezhinsky, I.; Ciupik, L.; O'Faoláin de Bhróithe, A.; Kar, P.; Falcone, A.; Varlotta, A.; Cerruti, M.; Cardenzana, J. V; Orr, M.; Pohl, Martin; Krennrich, F.; Khassen, Y.; Popkow, A.; Tyler, J.; Federici, S.

doi:10.1088/0004-637X/799/1/7

Journal Article

PUBDB-2016-00408

Veritas Observations of the BL LAC Object PG 1553+113

Aliu, E. ; Archer, A. ; Aune, T. ; Barnacka, A. ; Behera, B.DESY* ; Beilicke, M. ; Benbow, W. ; Berger, K. ; Bird, R. ; Buckley, J. H. ; Bugaev, V. ; Byrum, K. ; Cardenzana, J. V. ; Cerruti, M. ; Chen, X.DESY* ; Ciupik, L. ; Connolly, M. P. ; Cui, W. ; Dickinson, H. J. ; Dumm, J. ; Eisch, J. D. ; Errando, M. ; Falcone, A. ; Federici, S.>Extern*DESY* ; Feng, Q. ; Finley, J. P. ; Fortin, P. ; Fortson, L. ; Furniss, A. ; Galante, N. ; Gillanders, G. H. ; Griffin, S. ; Griffiths, S. T. ; Grube, J. ; Gyuk, G. ; Håkansson, N. ; Hanna, D. ; Holder, J. ; Hughes, G.DESY* ; Humensky, T. B. ; Johnson, C. A. ; Kaaret, P. ; Kar, P. ; Kertzman, M. ; Khassen, Y. ; Kieda, D. ; Krawczynski, H. ; Krennrich, F. ; Kumar, S. ; Lang, M. J. ; Madhavan, A. ; McArthur, S. ; McCann, A. ; Meagher, K. ; Millis, J. ; Moriarty, P. ; Nieto, D. ; O'Faoláin de Bhróithe, A.DESY* ; Ong, R. A. ; Orr, M. ; Otte, A. N. ; Park, N. ; Perkins, J. S. ; Pohl, M.DESY* ; Popkow, A. ; Prokoph, H.DESY* ; Pueschel, E. ; 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.DESY* ; Tucci, J. V. ; Tyler, J. ; Varlotta, A. ; Vassiliev, V. V. ; Wakely, S. P. ; Weinstein, A. ; Welsing, R.DESY* ; Wilhelm, A.DESY* ; Williams, D. A. ; Zitzer, B.

2015
Univ.11032 Chicago, Ill. [u.a.]

The astrophysical journal / 1 799(1), 7 - (2015) [10.1088/0004-637X/799/1/7]

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Please use a persistent id in citations: doi:10.1088/0004-637X/799/1/7 doi:10.3204/PUBDB-2016-00408

Report No.: arXiv:1411.1439

Abstract: We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described by a power law with a spectral index of 4.33 $\pm$ 0.09. The time-averaged integral flux above 200 GeV measured for this period was (1.69 $\pm$ 0.06) × $10^{–11}$ photons $cm^{–2} s^{–1}$, corresponding to 6.9% of the Crab Nebula flux. We also present the combined $\gamma$-ray spectrum from the Fermi Large Area Telescope and VERITAS covering an energy range from 100 MeV to 560 GeV. The data are well fit by a power law with an exponential cutoff at 101.9 $\pm$ 3.2 GeV. The origin of the cutoff could be intrinsic to PG 1553+113 or be due to the $\gamma$-ray opacity of our universe through pair production off the extragalactic background light (EBL). Given lower limits to the redshift of $\mathit{z} >$ 0.395 based on optical/UV observations of PG 1553+113, the cutoff would be dominated by EBL absorption. Conversely, the small statistical uncertainties of the VERITAS energy spectrum have allowed us to provide a robust upper limit on the redshift of PG 1553+113 of $\mathit{z} \le$ 0.62. A strongly elevated mean flux of (2.50 $\pm$ 0.14) × $10^{–11}$ photons $cm^{–2} s^{–1}$ (10.3% of the Crab Nebula flux) was observed during 2012, with the daily flux reaching as high as (4.44 $\pm$ 0.71) $10^{-11}$ photons $cm^{-2} s^{-1}$ (18.3% of the Crab Nebula flux) on MJD 56048. The light curve measured during the 2012 observing season is marginally inconsistent with a steady flux, giving a $\mathit{χ}$2 probability for a steady flux of 0.03%.

Classification:

ddc:520

Note: (c) The American Astronomical Society

Contributing Institute(s):

Astroteilchenphysik (ZEU-EXP/AT)

Research Program(s):

523 - High-energy gamma ray astronomy (POF2-523) (POF2-523)

Experiment(s):

Measurement at external facility

Appears in the scientific report 2015

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Medline

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Preprint/Internal Report Aliu, E. (Corresponding Author) ; Archer, A. ; Aune, T. ; et al
VERITAS Observations of the BL Lac Object PG 1553+113
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