VERITAS OBSERVATIONS OF THE BL LAC OBJECT PG 1553+113

被引：20

作者：

Aliu, E. ^{[1
]}

Archer, A. ^{[2
]}

Aune, T. ^{[3
]}

Barnacka, A. ^{[4
]}

Behera, B. ^{[5
]}

Beilicke, M. ^{[2
]}

Benbow, W. ^{[6
]}

Berger, K. ^{[7
,8
]}

Bird, R. ^{[9
]}

Buckley, J. H. ^{[2
]}

Bugaev, V. ^{[2
]}

Byrum, K. ^{[10
]}

Cardenzana, J. V. ^{[11
]}

Cerruti, M. ^{[6
]}

Chen, X. ^{[5
,12
]}

Ciupik, L. ^{[13
]}

Connolly, M. P. ^{[14
]}

Cui, W. ^{[15
]}

Dickinson, H. J. ^{[11
]}

Dumm, J. ^{[16
]}

Eisch, J. D. ^{[11
]}

Errando, M. ^{[1
]}

Falcone, A. ^{[17
]}

Federici, S. ^{[5
,12
]}

Feng, Q. ^{[15
]}

Finley, J. P. ^{[15
]}

Fortin, P. ^{[6
]}

Fortson, L. ^{[16
]}

Furniss, A. ^{[18
,19
]}

Galante, N. ^{[6
]}

Gillanders, G. H. ^{[14
]}

Griffin, S. ^{[20
]}

Griffiths, S. T. ^{[21
]}

Grube, J. ^{[13
]}

Gyuk, G. ^{[13
]}

Hakansson, N. ^{[12
]}

Hanna, D. ^{[20
]}

Holder, J. ^{[7
,8
]}

Hughes, G. ^{[5
]}

Humensky, T. B. ^{[22
]}

Johnson, C. A. ^{[18
,19
]}

Kaaret, P. ^{[21
]}

Kar, P. ^{[23
]}

Kertzman, M. ^{[24
]}

Khassen, Y. ^{[9
]}

Kieda, D. ^{[23
]}

Krawczynski, H. ^{[2
]}

Krennrich, F. ^{[11
]}

Kumar, S. ^{[7
,8
]}

Lang, M. J. ^{[14
]}

机构：

[1] Columbia Univ Barnard Coll, Dept Phys & Astron, New York, NY 10027 USA

[2] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[5] DESY, D-15738 Zeuthen, Germany

[6] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA

[7] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[8] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

[9] Univ Coll Dublin, Sch Phys, Dublin 4, Ireland

[10] Argonne Natl Lab, Argonne, IL 60439 USA

[11] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[12] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[13] Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA

[14] Natl Univ Ireland Univ Coll Galway, Sch Phys, Galway, Ireland

[15] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

[16] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[17] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[18] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[19] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[20] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[21] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[22] Columbia Univ, Dept Phys, New York, NY 10027 USA

[23] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[24] Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

[25] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[26] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[27] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[28] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

[29] Anderson Univ, Dept Phys, Anderson, IN 46012 USA

[30] Galway Mayo Inst Technol, Dept Life & Phys Sci, Galway, Ireland

[31] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[32] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 94307 USA

[33] Cork Inst Technol, Dept Appl Phys & Instrumentat, Cork, Ireland

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 799卷 / 01期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会; 爱尔兰科学基金会;

关键词：

BL Lacertae objects: general; EXTRAGALACTIC BACKGROUND LIGHT; LACERTAE OBJECTS; GAMMA-RAYS; RADIATION; SPECTRA; MODEL; SPECTROSCOPY; PG-1553+113; EVOLUTION; REDSHIFTS;

D O I：

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

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 +/- 0.09. The time-averaged integral flux above 200 GeV measured for this period was (1.69 +/- 0.06) x 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 +/- 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 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 z <= 0.62. A strongly elevated mean flux of (2.50 +/- 0.14) x10(-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 +/- 0.71) x10(-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 chi(2) probability for a steady flux of 0.03%.

引用

页数：9

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