VERITAS Observations of the BL Lac Object TXS 0506+056

A. U Abeysekara; A Archer; W Benbow; R Bird; A Brill; R Brose; J. H Buckley; J. L Christiansen; A. J Chromey; M. K Daniel; A Falcone; Q Feng; J. P Finley; L Fortson; A Furniss; G. H Gillanders; O Gueta; D Hanna; O Hervet; J Holder; G Hughes; T. B Humensky; C. A Johnson; P Kaaret; P Kar; N Kelley-Hoskins; M Kertzman; D Kieda; M Krause; F Krennrich; M. J Lang; P Moriarty; R Mukherjee; S O'Brien; R. A Ong; A. N Otte; N Park; A Petrashyk; M Pohl; E Pueschel; J Quinn; K Ragan; P. T Reynolds; G. T Richards; E Roache; C Rulten; I Sadeh; M Santander; S. S Scott; G. H Sembroski; K Shahinyan; J Tyler; S. P Wakely; A Weinstein; R. M Wells; P Wilcox; A Wilhelm; D. A Williams; T. J Williamson; B Zitzer; A Kaur; VERITAS Collaboration

doi:10.3847/2041-8213/aad053

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VERITAS Observations of the BL Lac Object TXS 0506+056

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VERITAS Observations of the BL Lac Object TXS 0506+056

A. U Abeysekara, A Archer, W Benbow, R Bird, A Brill, R Brose, J. H Buckley, J. L Christiansen, A. J Chromey, M. K Daniel, …

Astrophysical journal. Letters, Vol.861(2), p.L20

07/12/2018

DOI: 10.3847/2041-8213/aad053

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Abstract

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 ( ) in the full 35 hr data set. The average photon flux of the source during this period was (8.9 1.6) × 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.

astroparticle physics

BL Lacertae objects: individual (TXS 0506+056, VER J0509+057)

gamma rays: galaxies

neutrinos

quasars: general

Details

Title: Subtitle: VERITAS Observations of the BL Lac Object TXS 0506+056
Creators: A. U Abeysekara - University of Utah
A Archer - Washington University in St. Louis
W Benbow - Harvard University
R Bird - University of California, Los Angeles
A Brill - Columbia University
R Brose - University of Potsdam
J. H Buckley - Washington University in St. Louis
J. L Christiansen - California Polytechnic State University
A. J Chromey - Iowa State University
M. K Daniel - Harvard University
A Falcone - Pennsylvania State University
Q Feng - McGill University
J. P Finley - Purdue University West Lafayette
L Fortson - University of Minnesota
A Furniss - California State University, East Bay
G. H Gillanders - Ollscoil na Gaillimhe – University of Galway
O Gueta - DESY, Platanenallee 6, D-15738 Zeuthen, Germany
D Hanna - McGill University
O Hervet - University of California, Santa Cruz
J Holder - University of Delaware
G Hughes - Harvard University
T. B Humensky - Columbia University
C. A Johnson - University of California, Santa Cruz
P Kaaret - University of Iowa
P Kar - University of Utah
N Kelley-Hoskins - DESY, Platanenallee 6, D-15738 Zeuthen, Germany
M Kertzman - DePauw University
D Kieda - University of Utah
M Krause - DESY, Platanenallee 6, D-15738 Zeuthen, Germany
F Krennrich - Iowa State University
M. J Lang - Ollscoil na Gaillimhe – University of Galway
P Moriarty - Ollscoil na Gaillimhe – University of Galway
R Mukherjee - Columbia University
S O'Brien - University College Dublin
R. A Ong - University of California, Los Angeles
A. N Otte - Georgia Institute of Technology
N Park - University of Chicago
A Petrashyk - Columbia University
M Pohl - University of Potsdam
E Pueschel - DESY, Platanenallee 6, D-15738 Zeuthen, Germany
J Quinn - University College Dublin
K Ragan - McGill University
P. T Reynolds - Cork Institute of Technology
G. T Richards - Georgia Institute of Technology
E Roache - Harvard University
C Rulten - University of Minnesota
I Sadeh - DESY, Platanenallee 6, D-15738 Zeuthen, Germany
M Santander - University of Alabama
S. S Scott - University of California, Santa Cruz
G. H Sembroski - Purdue University West Lafayette
K Shahinyan - University of Minnesota
J Tyler - McGill University
S. P Wakely - University of Chicago
A Weinstein - Iowa State University
R. M Wells - Iowa State University
P Wilcox - University of Iowa
A Wilhelm - University of Potsdam
D. A Williams - University of California, Santa Cruz
T. J Williamson - University of Delaware
B Zitzer - McGill University
A Kaur - Pennsylvania State University
VERITAS Collaboration
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.861(2), p.L20
DOI: 10.3847/2041-8213/aad053
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: The American Astronomical Society
Number of pages: 6
Language: English
Date published: 07/12/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984199950102771

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