VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS

A. Archer; W. Benbow; R. Bird; E. Bourbeau; M. Buchovecky; J. H. Buckley; V. Bugaev; K. Byrum; M. Cerruti; M. P. Connolly; W. Cui; M. Errando; A. Falcone; Q. Feng; M. Fernandez-Alonso; J. P. Finley; H. Fleischhack; A. Flinders; L. Fortson; A. Furniss; S. Griffin; J. Grube; M. Hütten; D. Hanna; O. Hervet; J. Holder; T. B. Humensky; C. A. Johnson; P. Kaaret; P. Kar; N. Kelley-Hoskins; M. Kertzman; D. Kieda; M. Krause; S. Kumar; M. J. Lang; T. T Y Lin; G. Maier; P. Moriarty; R. Mukherjee; D. Nieto; S. O'Brien; R. A. Ong; N. Park; M. Pohl; A. Popkow; E. Pueschel; J. Quinn; K. Ragan; P. T. Reynolds; G. T. Richards; E. Roache; J. Rousselle; A. C. Rovero; I. Sadeh; S. Schlenstedt; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J. Tyler; S. P. Wakely; P. Wilcox; A. Wilhelm; D. A. Williams

doi:10.3847/0004-637X/831/1/113

VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS

A. Archer, W. Benbow, R. Bird, E. Bourbeau, M. Buchovecky, J. H. Buckley, V. Bugaev, K. Byrum, M. Cerruti, M. P. Connolly, W. Cui, M. Errando, A. Falcone, Q. Feng, M. Fernandez-Alonso, J. P. Finley, H. Fleischhack, A. Flinders, L. Fortson, A. FurnissS. Griffin, J. Grube, M. Hütten, D. Hanna, O. Hervet, J. Holder, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, M. Kertzman, D. Kieda, M. Krause, S. Kumar, M. J. Lang, T. T Y Lin, G. Maier, P. Moriarty, R. Mukherjee, D. Nieto, S. O'Brien, R. A. Ong, N. Park, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, G. T. Richards, E. Roache, J. Rousselle, A. C. Rovero, I. Sadeh, S. Schlenstedt, G. H. Sembroski, K. Shahinyan, D. Staszak, I. Telezhinsky, J. Tyler, S. P. Wakely, P. Wilcox, A. Wilhelm, D. A. Williams

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 10⁷. The low-mass X-ray binary V 404 Cyg and the high-mass system 4U 0115+634 underwent such major outbursts in 2015 June and October, respectively. We present here observations at energies above hundreds of GeV with the VERITAS observatory taken during some of the brightest X-ray activity ever observed from these systems. No gamma-ray emission has been detected by VERITAS in 2.5 hr of observations of the microquasar V 404 Cyg from 2015, June 20-21. The upper flux limits derived from these observations on the gamma-ray flux above 200 GeV of F cm^-2 s^-1 correspond to a tiny fraction (about 10^-6) of the Eddington luminosity of the system, in stark contrast to that seen in the X-ray band. No gamma-rays have been detected during observations of 4U 0115+634 in the period of major X-ray activity in 2015 October. The flux upper limit derived from our observations is F cm^-2 s^-1 for gamma-rays above 300 GeV, setting an upper limit on the ratio of gamma-ray to X-ray luminosity of less than 4%.

Original language	English (US)
Article number	113
Journal	Astrophysical Journal
Volume	831
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/831/1/113
State	Published - Nov 1 2016

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© 2016. The American Astronomical Society. All rights reserved..

Keywords

acceleration of particles
binaries: general
gamma rays: general
stars: individual (V 404 Cyg, 4U 0115+634)

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Archer, A., Benbow, W., Bird, R., Bourbeau, E., Buchovecky, M., Buckley, J. H., Bugaev, V., Byrum, K., Cerruti, M., Connolly, M. P., Cui, W., Errando, M., Falcone, A., Feng, Q., Fernandez-Alonso, M., Finley, J. P., Fleischhack, H., Flinders, A., Fortson, L., ... Williams, D. A. (2016). VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS. Astrophysical Journal, 831(1), Article 113. https://doi.org/10.3847/0004-637X/831/1/113

Archer, A, Benbow, W, Bird, R, Bourbeau, E, Buchovecky, M, Buckley, JH, Bugaev, V, Byrum, K, Cerruti, M, Connolly, MP, Cui, W, Errando, M, Falcone, A, Feng, Q, Fernandez-Alonso, M, Finley, JP, Fleischhack, H, Flinders, A, Fortson, L, Furniss, A, Griffin, S, Grube, J, Hütten, M, Hanna, D, Hervet, O, Holder, J, Humensky, TB, Johnson, CA, Kaaret, P, Kar, P, Kelley-Hoskins, N, Kertzman, M, Kieda, D, Krause, M, Kumar, S, Lang, MJ, Lin, TTY, Maier, G, Moriarty, P, Mukherjee, R, Nieto, D, O'Brien, S, Ong, RA, Park, N, Pohl, M, Popkow, A, Pueschel, E, Quinn, J, Ragan, K, Reynolds, PT, Richards, GT, Roache, E, Rousselle, J, Rovero, AC, Sadeh, I, Schlenstedt, S, Sembroski, GH, Shahinyan, K, Staszak, D, Telezhinsky, I, Tyler, J, Wakely, SP, Wilcox, P, Wilhelm, A & Williams, DA 2016, 'VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS', Astrophysical Journal, vol. 831, no. 1, 113. https://doi.org/10.3847/0004-637X/831/1/113

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title = "VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS",

abstract = "Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 107. The low-mass X-ray binary V 404 Cyg and the high-mass system 4U 0115+634 underwent such major outbursts in 2015 June and October, respectively. We present here observations at energies above hundreds of GeV with the VERITAS observatory taken during some of the brightest X-ray activity ever observed from these systems. No gamma-ray emission has been detected by VERITAS in 2.5 hr of observations of the microquasar V 404 Cyg from 2015, June 20-21. The upper flux limits derived from these observations on the gamma-ray flux above 200 GeV of F cm-2 s-1 correspond to a tiny fraction (about 10-6) of the Eddington luminosity of the system, in stark contrast to that seen in the X-ray band. No gamma-rays have been detected during observations of 4U 0115+634 in the period of major X-ray activity in 2015 October. The flux upper limit derived from our observations is F cm-2 s-1 for gamma-rays above 300 GeV, setting an upper limit on the ratio of gamma-ray to X-ray luminosity of less than 4%.",

keywords = "acceleration of particles, binaries: general, gamma rays: general, stars: individual (V 404 Cyg, 4U 0115+634)",

author = "A. Archer and W. Benbow and R. Bird and E. Bourbeau and M. Buchovecky and Buckley, {J. H.} and V. Bugaev and K. Byrum and M. Cerruti and Connolly, {M. P.} and W. Cui and M. Errando and A. Falcone and Q. Feng and M. Fernandez-Alonso and Finley, {J. P.} and H. Fleischhack and A. Flinders and L. Fortson and A. Furniss and S. Griffin and J. Grube and M. H{\"u}tten and D. Hanna and O. Hervet and J. Holder and Humensky, {T. B.} and Johnson, {C. A.} and P. Kaaret and P. Kar and N. Kelley-Hoskins and M. Kertzman and D. Kieda and M. Krause and S. Kumar and Lang, {M. J.} and Lin, {T. T Y} and G. Maier and P. Moriarty and R. Mukherjee and D. Nieto and S. O'Brien and Ong, {R. A.} and N. Park and M. Pohl and A. Popkow and E. Pueschel and J. Quinn and K. Ragan and Reynolds, {P. T.} and Richards, {G. T.} and E. Roache and J. Rousselle and Rovero, {A. C.} and I. Sadeh and S. Schlenstedt and Sembroski, {G. H.} and K. Shahinyan and D. Staszak and I. Telezhinsky and J. Tyler and Wakely, {S. P.} and P. Wilcox and A. Wilhelm and Williams, {D. A.}",

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AU - Archer, A.

AU - Benbow, W.

AU - Bird, R.

AU - Bourbeau, E.

AU - Buchovecky, M.

AU - Buckley, J. H.

AU - Bugaev, V.

AU - Byrum, K.

AU - Cerruti, M.

AU - Connolly, M. P.

AU - Cui, W.

AU - Errando, M.

AU - Falcone, A.

AU - Feng, Q.

AU - Fernandez-Alonso, M.

AU - Finley, J. P.

AU - Fleischhack, H.

AU - Flinders, A.

AU - Fortson, L.

AU - Furniss, A.

AU - Griffin, S.

AU - Grube, J.

AU - Hütten, M.

AU - Hanna, D.

AU - Hervet, O.

AU - Holder, J.

AU - Humensky, T. B.

AU - Johnson, C. A.

AU - Kaaret, P.

AU - Kar, P.

AU - Kelley-Hoskins, N.

AU - Kertzman, M.

AU - Kieda, D.

AU - Krause, M.

AU - Kumar, S.

AU - Lang, M. J.

AU - Lin, T. T Y

AU - Maier, G.

AU - Moriarty, P.

AU - Mukherjee, R.

AU - Nieto, D.

AU - O'Brien, S.

AU - Ong, R. A.

AU - Park, N.

AU - Pohl, M.

AU - Popkow, A.

AU - Pueschel, E.

AU - Quinn, J.

AU - Ragan, K.

AU - Reynolds, P. T.

AU - Richards, G. T.

AU - Roache, E.

AU - Rousselle, J.

AU - Rovero, A. C.

AU - Sadeh, I.

AU - Schlenstedt, S.

AU - Sembroski, G. H.

AU - Shahinyan, K.

AU - Staszak, D.

AU - Telezhinsky, I.

AU - Tyler, J.

AU - Wakely, S. P.

AU - Wilcox, P.

AU - Wilhelm, A.

AU - Williams, D. A.

PY - 2016/11/1

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N2 - Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 107. The low-mass X-ray binary V 404 Cyg and the high-mass system 4U 0115+634 underwent such major outbursts in 2015 June and October, respectively. We present here observations at energies above hundreds of GeV with the VERITAS observatory taken during some of the brightest X-ray activity ever observed from these systems. No gamma-ray emission has been detected by VERITAS in 2.5 hr of observations of the microquasar V 404 Cyg from 2015, June 20-21. The upper flux limits derived from these observations on the gamma-ray flux above 200 GeV of F cm-2 s-1 correspond to a tiny fraction (about 10-6) of the Eddington luminosity of the system, in stark contrast to that seen in the X-ray band. No gamma-rays have been detected during observations of 4U 0115+634 in the period of major X-ray activity in 2015 October. The flux upper limit derived from our observations is F cm-2 s-1 for gamma-rays above 300 GeV, setting an upper limit on the ratio of gamma-ray to X-ray luminosity of less than 4%.

AB - Transient X-ray binaries produce major outbursts in which the X-ray flux can increase over the quiescent level by factors as large as 107. The low-mass X-ray binary V 404 Cyg and the high-mass system 4U 0115+634 underwent such major outbursts in 2015 June and October, respectively. We present here observations at energies above hundreds of GeV with the VERITAS observatory taken during some of the brightest X-ray activity ever observed from these systems. No gamma-ray emission has been detected by VERITAS in 2.5 hr of observations of the microquasar V 404 Cyg from 2015, June 20-21. The upper flux limits derived from these observations on the gamma-ray flux above 200 GeV of F cm-2 s-1 correspond to a tiny fraction (about 10-6) of the Eddington luminosity of the system, in stark contrast to that seen in the X-ray band. No gamma-rays have been detected during observations of 4U 0115+634 in the period of major X-ray activity in 2015 October. The flux upper limit derived from our observations is F cm-2 s-1 for gamma-rays above 300 GeV, setting an upper limit on the ratio of gamma-ray to X-ray luminosity of less than 4%.

KW - acceleration of particles

KW - binaries: general

KW - gamma rays: general

KW - stars: individual (V 404 Cyg, 4U 0115+634)

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UR - http://www.scopus.com/inward/citedby.url?scp=84994235274&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/831/1/113

DO - 10.3847/0004-637X/831/1/113

M3 - Article

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SN - 0004-637X

VL - 831

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 113

ER -

VERY HIGH ENERGY OBSERVATIONS of the BINARIES v 404 CYG and 4U 0115+634 during GIANT X-RAY OUTBURSTS

Abstract

Bibliographical note

Keywords

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