Journal article
VERY HIGH ENERGY OBSERVATIONS OF THE BINARIES V 404 CYG AND 4U 0115+634 DURING GIANT X-RAY OUTBURSTS
The Astrophysical journal, Vol.831(1), p.113
10/31/2016
DOI: 10.3847/0004-637X/831/1/113
Abstract
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%.
Details
- Title: Subtitle
- VERY HIGH ENERGY OBSERVATIONS OF THE BINARIES V 404 CYG AND 4U 0115+634 DURING GIANT X-RAY OUTBURSTS
- Creators
- A Archer - Washington University in St. LouisS Griffin - McGill UniversityW Benbow - Harvard UniversityJ Grube - Adler PlanetariumR Bird - University College DublinM Hütten - Purdue University West LafayetteE Bourbeau - McGill UniversityD Hanna - McGill UniversityM Buchovecky - University of California, Los AngelesO Hervet - University of California, Santa CruzJ. H Buckley - Washington University in St. LouisJ Holder - University of DelawareV Bugaev - Washington University in St. LouisT. B Humensky - Columbia UniversityC. A Johnson - University of California, Santa CruzK Byrum - Argonne National LaboratoryM Cerruti - Harvard UniversityP Kaaret - University of IowaM. P Connolly - Ollscoil na Gaillimhe – University of GalwayP Kar - University of UtahW Cui - Purdue University West LafayetteN Kelley-Hoskins - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM Errando - Washington University in St. LouisM Kertzman - DePauw UniversityD Kieda - University of UtahA Falcone - Pennsylvania State UniversityQ Feng - Purdue University West LafayetteM Krause - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM Fernandez-Alonso - CIUDADS Kumar - University of DelawareJ. P Finley - Purdue University West LafayetteM. J Lang - Ollscoil na Gaillimhe – University of GalwayT. T. Y Lin - McGill UniversityH Fleischhack - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyG Maier - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyA Flinders - University of UtahL Fortson - University of MinnesotaP Moriarty - Ollscoil na Gaillimhe – University of GalwayR Mukherjee - Columbia UniversityA Furniss - California State University, East BayD Nieto - Columbia UniversityS O'Brien - University College DublinR. A Ong - University of California, Los AngelesN Park - University of ChicagoM Pohl - University of PotsdamA Popkow - University of California, Los AngelesE Pueschel - University College DublinJ Quinn - University College DublinK Ragan - McGill UniversityP. T Reynolds - Cork Institute of TechnologyG. T Richards - Georgia Institute of TechnologyE Roache - Harvard UniversityJ Rousselle - University of California, Los AngelesA. C Rovero - Universidad de Buenos AiresI Sadeh - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyS Schlenstedt - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyG. H Sembroski - Purdue University West LafayetteK Shahinyan - University of MinnesotaD Staszak - University of ChicagoI Telezhinsky - University of PotsdamJ Tyler - McGill UniversityS. P Wakely - University of ChicagoP Wilcox - University of IowaA Wilhelm - University of PotsdamD. A Williams - University of California, Santa Cruz
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.831(1), p.113
- DOI
- 10.3847/0004-637X/831/1/113
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Institute of Physics (IOP)
- Number of pages
- 5
- Language
- English
- Date published
- 10/31/2016
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199780602771
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