Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS

被引：14

作者：

Allen, C. ^{[1
]}

Archambault, S. ^{[2
]}

Archer, A. ^{[3
]}

Benbow, W. ^{[4
]}

Bird, R. ^{[5
]}

Bourbeau, E. ^{[2
]}

Brose, R. ^{[6
,7
]}

Buchovecky, M. ^{[5
]}

Buckley, J. H. ^{[3
]}

Bugaev, V. ^{[3
]}

Cardenzana, J. V. ^{[8
]}

Cerruti, M. ^{[4
]}

Chen, X. ^{[6
,7
]}

Christiansen, J. L. ^{[1
]}

Connolly, M. P. ^{[9
]}

Cui, W. ^{[10
,11
,12
]}

Daniel, M. K. ^{[4
]}

Eisch, J. D. ^{[8
]}

Falcone, A. ^{[13
]}

Feng, Q. ^{[2
]}

Fernandez-Alonso, M. ^{[14
]}

Finley, J. P. ^{[10
]}

Fleischhack, H. ^{[7
]}

Flinders, A. ^{[15
]}

Fortson, L. ^{[16
]}

Furniss, A. ^{[17
]}

Gillanders, G. H. ^{[9
]}

Griffin, S. ^{[2
]}

Grube, J. ^{[18
]}

Huetten, M. ^{[7
]}

Hakansson, N. ^{[6
]}

Hanna, D. ^{[2
]}

Hervet, O. ^{[19
,20
]}

Holder, J. ^{[21
,22
]}

Hughes, G. ^{[4
]}

Humensky, T. B. ^{[23
]}

Johnson, C. A. ^{[19
,20
]}

Kaaret, P. ^{[24
]}

Kar, P. ^{[15
]}

Kelley-Hoskins, N. ^{[7
]}

Kertzman, M. ^{[25
]}

Kieda, D. ^{[15
]}

Krause, M. ^{[7
]}

Krennrich, F. ^{[8
]}

Kumar, S. ^{[21
,22
]}

Lang, M. J. ^{[9
]}

Maier, G. ^{[7
]}

McArthur, S. ^{[10
]}

McCann, A. ^{[2
]}

Meagher, K. ^{[26
,27
]}

机构：

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

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

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

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

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

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

[7] DESY, Platanenallee 6, D-15738 Zeuthen, Germany

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

[9] Natl Univ Ireland Galway, Sch Phys, Univ Rd, Galway, Ireland

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

[11] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[12] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China

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

[14] Inst Astron & Fis Espacio, Casilla Correo 67 Sucursal 28,C1428ZAA, RA-1428 Buenos Aires, DF, Argentina

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

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

[17] Calif State Univ East Bay, Dept Phys, Hayward, CA 94542 USA

[18] Stevens Inst Technol, Dept Phys, Hoboken, NJ 07030 USA

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

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

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

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

[23] Columbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA

[24] Univ Iowa, Dept Phys & Astron, Van Allen Hall, Iowa City, IA 52242 USA

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

[26] Georgia Inst Technol, Sch Phys, 837 State St NW, Atlanta, GA 30332 USA

[27] Georgia Inst Technol, Ctr Relativist Astrophys, 837 State St NW, Atlanta, GA 30332 USA

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

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

[30] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA

[31] Cork Inst Technol, Dept Phys Sci, Cork, Ireland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 471卷 / 02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;

关键词：

astroparticle physics; BL Lacertae objects: individual: 1ES 2344+514=VERJ2347+517; gamma-rays: galaxies; ACTIVE GALACTIC NUCLEI; BL-LACERTAE OBJECTS; BACKGROUND-RADIATION; X-RAY; EMISSION; RADIO; CONSTRAINTS; VARIABILITY; TELESCOPE; SPECTRUM;

D O I：

10.1093/mnras/stx1756

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present very-high-energy gamma-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance above the background of 20.8 sigma in 47.2 h (livetime) of observations, making this the most comprehensive very-high-energy study of 1ES 2344+514 to date. Using these observations, the temporal properties of 1ES 2344+514 are studied on short and long times-scales. We fit a constant-flux model to nightly and seasonally binned light curves and apply a fractional variability test to determine the stability of the source on different time-scales. We reject the constant-flux model for the 2007-2008 and 2014-2015 nightly binned light curves and for the long-term seasonally binned light curve at the > 3 sigma level. The spectra of the time-averaged emission before and after correction for attenuation by the extragalactic background light are obtained. The observed time-averaged spectrum above 200 GeV is satisfactorily fitted (x(2)/NDF = 7.89/6) by a power-law function with an index Gamma = 2.46 +/- 0.06(stat) +/- 0.20(sys) and extends to at least 8 TeV. The extragalactic-backgroundlight-deabsorbed spectrum is adequately fit (x(2)/NDF = 6.73/6) by a power-law function with an index Gamma = 2.15 +/- 0.06(stat) +/- 0.20(sys) while an F-test indicates that the power law with an exponential cut-off function provides a marginally better fit (x(2)/NDF = 2.56/5) at the 2.1 sigma level. The source location is found to be consistent with the published radio location and its spatial extent is consistent with a point source.

引用

页码：2117 / 2123

页数：7

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