VERITAS Observations of the BL Lac Object TXS 0506+056

被引：30

作者：

Abeysekara, A. U. ^{[1
]}

Archer, A. ^{[2
]}

Benbow, W. ^{[3
]}

Bird, R. ^{[4
]}

Brill, A. ^{[5
]}

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

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

Christiansen, J. L. ^{[8
]}

Chromey, A. J. ^{[9
]}

Daniel, M. K. ^{[3
]}

Falcone, A. ^{[10
]}

Feng, Q. ^{[11
]}

Finley, J. P. ^{[12
]}

Fortson, L. ^{[13
]}

Furniss, A. ^{[14
]}

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

Gueta, O. ^{[7
]}

Hanna, D. ^{[11
]}

Hervet, O. ^{[16
,17
]}

Holder, J. ^{[18
,19
]}

Hughes, G. ^{[3
]}

Humensky, T. B. ^{[5
]}

Johnson, C. A. ^{[16
,17
]}

Kaaret, P. ^{[20
]}

Kar, P. ^{[1
]}

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

Kertzman, M. ^{[21
]}

Kieda, D. ^{[1
]}

Krause, M. ^{[7
]}

Krennrich, F. ^{[9
]}

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

Moriarty, P. ^{[15
]}

Mukherjee, R. ^{[22
]}

O'Brien, S. ^{[23
]}

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

Otte, A. N. ^{[24
,25
]}

Park, N. ^{[26
,27
]}

Petrashyk, A. ^{[5
]}

Pohl, M. ^{[6
,7
]}

Pueschel, E. ^{[7
]}

Quinn, J. ^{[23
]}

Ragan, K. ^{[11
]}

Reynolds, P. T. ^{[28
]}

Richards, G. T. ^{[24
,25
]}

Roache, E. ^{[3
]}

Rulten, C. ^{[13
]}

Sadeh, I. ^{[7
]}

Santander, M. ^{[29
]}

Scott, S. S. ^{[16
,17
]}

Sembroski, G. H. ^{[12
]}

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

[14] Calif State Univ Hayward, Dept Phys, Hayward, CA 94542 USA

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

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

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

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

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

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

[21] DePauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

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

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

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

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

[26] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53703 USA

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

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

[29] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 861卷 / 02期

基金：

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：

astroparticle physics; BL Lacertae objects: individual (TXS 0506+056; VER J0509+057); gamma rays: galaxies; quasars: general; neutrinos; RADIATION; I;

D O I：

10.3847/2041-8213/aad053

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event IC 170922A, of potential astrophysical origin. It was soon determined that the neutrino direction was consistent with the location of the gamma-ray blazar TXS 0506+056. (3FGL J0509.4+ 0541), which was in an elevated gamma-ray emission state as measured by the Fermi satellite. Very Energetic Radiation Imaging Telescope Array System (VERITAS) observations of the neutrino/blazar region started on 2017 September 23 in response to the neutrino alert and continued through 2018 February 6. While no significant very-high-energy (VHE; E > 100 GeV) emission was observed from the blazar by VERITAS in the two-week period immediately following the IceCube alert, TXS 0506+ 056 was detected by VERITAS with a significance of 5.8 standard deviations (sigma) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 +/- 1.6). x. 10(-12) cm(-2) s(-1), or 1.6% of the Crab Nebula flux, above an energy threshold of 110 GeV, with a soft spectral index of 4.8. +/-. 1.3.

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