MULTIWAVELENGTH OBSERVATIONS OF THE VERY HIGH ENERGY BLAZAR 1ES 2344+514

被引：38

作者：

Acciari, V. A. ^{[1
]}

Aliu, E. ^{[2
,3
]}

Arlen, T. ^{[4
]}

Aune, T. ^{[5
,6
]}

Beilicke, M. ^{[7
]}

Benbow, W. ^{[1
]}

Boltuch, D. ^{[2
,3
]}

Bugaev, V. ^{[7
]}

Cannon, A. ^{[8
]}

Ciupik, L. ^{[9
]}

Cogan, P. ^{[10
]}

Colin, P. ^{[11
]}

Dickherber, R. ^{[7
]}

Falcone, A. ^{[12
]}

Fegan, S. J. ^{[4
]}

Finley, J. P. ^{[13
]}

Fortin, P. ^{[14
]}

Fortson, L. F. ^{[9
]}

Furniss, A. ^{[5
,6
]}

Gall, D. ^{[13
]}

Gillanders, G. H. ^{[15
]}

Grube, J. ^{[8
,9
]}

Guenette, R. ^{[10
]}

Gyuk, G. ^{[9
]}

Hanna, D. ^{[10
]}

Holder, J. ^{[2
,3
]}

Horan, D. ^{[16
]}

Hui, C. M. ^{[11
]}

Humensky, T. B. ^{[17
]}

Imran, A. ^{[18
]}

Kaaret, P. ^{[19
]}

Karlsson, N. ^{[9
]}

Kertzman, M. ^{[20
]}

Kieda, D. ^{[11
]}

Kildea, J. ^{[1
]}

Konopelko, A. ^{[21
]}

Krawczynski, H. ^{[7
]}

Krennrich, F. ^{[18
]}

Lang, M. J. ^{[15
]}

LeBohec, S. ^{[11
]}

Maier, G. ^{[10
]}

Moriarty, P. ^{[22
]}

Mukherjee, R. ^{[14
]}

Ong, R. A. ^{[4
]}

Otte, A. N. ^{[5
,6
]}

Pandel, D. ^{[19
]}

Perkins, J. S. ^{[1
]}

Pichel, A. ^{[23
]}

Pohl, M. ^{[18
]}

Quinn, J. ^{[8
]}

机构：

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

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

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

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

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

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

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

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

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

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

[11] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

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

[13] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

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

[15] Natl Univ Ireland, Sch Phys, Galway, Ireland

[16] Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France

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

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

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

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

[21] Pittsburg State Univ, Dept Phys, Pittsburg, KS 66762 USA

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

[23] Inst Astron & Fis Espacio, Buenos Aires, DF, Argentina

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

[25] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

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

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 738卷 / 02期

基金：

爱尔兰科学基金会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

BL Lacertae objects: individual (IES 2344+514); GAMMA-RAY EMISSION; SPECTRAL VARIABILITY; LACERTAE OBJECTS; STRONG FLARES; RADIATION; VERITAS; ARRAY; MARKARIAN-421; CALIBRATION; DISCOVERY;

D O I：

10.1088/0004-637X/738/2/169

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Multiwavelength observations of the high-frequency-peaked blazar 1ES 2344+514 were performed from 2007 October to 2008 January. The campaign represents the first contemporaneous data on the object at very high energy (VHE, E > 100 GeV) gamma-ray, X-ray, and UV energies. Observations with VERITAS in VHE gamma-rays yield a strong detection of 20s with 633 excess events in a total exposure of 18.1 hr live time. A strong VHE gamma-ray flare on 2007 December 7 is measured at F(> 300 GeV) = (6.76 +/- 0.62) x 10(-11) photons cm(-2) s(-1), corresponding to 48% of the Crab Nebula flux. Excluding this flaring episode, nightly variability at lower fluxes is observed with a time-averaged mean of F(> 300 GeV) = (1.06 +/- 0.09) x 10(-11) photons cm(-2) s(-1) (7.6% of the Crab Nebula flux). The differential photon spectrum between 390 GeV and 8.3 TeV for the time-averaged observations excluding 2007 December 7 is well described by a power law with a photon index of G = 2.78 +/- 0.09(stat) +/- 0.15(syst). On the flaring night of 2007 December 7 the measured VHE gamma-ray photon index was Gamma = 2.43 +/- 0.22(stat) +/- 0.15(syst). Over the full period of VERITAS observations contemporaneous X-ray and UV data were taken with Swift and RXTE. The measured 2-10 keV flux ranged by a factor of similar to 7 during the campaign. On 2007 December 8 the highest ever observed X-ray flux from 1ES 2344+514 was measured by Swift X-ray Telescope at a flux of F(2-10 keV) = (6.28 +/- 0.31) x 10(-11) erg cm(-2) s(-1). Evidence for a correlation between the X-ray flux and VHE. -ray flux on nightly timescales is indicated with a Pearson correlation coefficient of r = 0.60 +/- 0.11. Contemporaneous spectral energy distributions (SEDs) of 1ES 2344+514 are presented for two distinct flux states. A one-zone synchrotron self-Compton (SSC) model describes both SEDs using parameters consistent with previous SSC modeling of 1ES 2344+514 from non-contemporaneous observations.

引用

页数：8

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