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Journal article
VERY HIGH ENERGY OBSERVATIONS OF THE BINARIES V 404 CYG AND 4U 0115+634 DURING GIANT X-RAY OUTBURSTS
The Astrophysical journal, v 831(1), p113
31 Oct 2016
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%.
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- Title
- VERY HIGH ENERGY OBSERVATIONS OF THE BINARIES V 404 CYG AND 4U 0115+634 DURING GIANT X-RAY OUTBURSTS
- Creators
- A Archer - Washington University Department of Physics, St. Louis, MO 63130, USAW Benbow - Harvard-Smithsonian Center for Astrophysics Fred Lawrence Whipple Observatory, Amado, AZ 85645, USAR Bird - University College Dublin School of Physics, Belfield, Dublin 4, IrelandE Bourbeau - McGill University Physics Department, Montreal, QC H3A 2T8, CanadaM Buchovecky - University of California Department of Physics and Astronomy, Los Angeles, CA 90095, USAJ. H Buckley - Washington University Department of Physics, St. Louis, MO 63130, USAV Bugaev - Washington University Department of Physics, St. Louis, MO 63130, USAK Byrum - Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, USAM Cerruti - Harvard-Smithsonian Center for Astrophysics Fred Lawrence Whipple Observatory, Amado, AZ 85645, USAM. P Connolly - National University of Ireland Galway School of Physics, University Road, Galway, IrelandW Cui - Tsinghua University Department of Physics and Center for Astrophysics, Beijing 100084, ChinaM Errando - Washington University Department of Physics, St. Louis, MO 63130, USAA Falcone - Pennsylvania State UniversityQ Feng - Purdue University Department of Physics and Astronomy, West Lafayette, IN 47907, USAM Fernandez-Alonso - Instituto de Astronomia y Fisica del Espacio , Casilla de Correo 67-Sucursal 28, (C1428ZAA) Ciudad Autnoma de Buenos Aires, ArgentinaJ. P Finley - Purdue University Department of Physics and Astronomy, West Lafayette, IN 47907, USAH Fleischhack - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyA Flinders - University of Utah Department of Physics and Astronomy, Salt Lake City, UT 84112, USAL Fortson - University of Minnesota School of Physics and Astronomy, Minneapolis, MN 55455, USAA Furniss - California State University-East Bay Department of Physics, Hayward, CA 94542, USAS Griffin - McGill University Physics Department, Montreal, QC H3A 2T8, CanadaJ Grube - Adler Planetarium and Astronomy Museum Astronomy Department, Chicago, IL 60605, USAM Hütten - Purdue University Department of Physics and Astronomy, West Lafayette, IN 47907, USAD Hanna - McGill University Physics Department, Montreal, QC H3A 2T8, CanadaO Hervet - University of California Santa Cruz Institute for Particle Physics and Department of Physics, Santa Cruz, CA 95064, USAJ Holder - University of Delaware Department of Physics and Astronomy and the Bartol Research Institute, Newark, DE 19716, USAT. B Humensky - Columbia University Physics Department, New York, NY 10027, USAC. A Johnson - University of California, Santa CruzP Kaaret - University of Iowa Department of Physics and Astronomy, Van Allen Hall, Iowa City, IA 52242, USAP Kar - University of Utah Department of Physics and Astronomy, Salt Lake City, UT 84112, USAN Kelley-Hoskins - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyM Kertzman - DePauw University Department of Physics and Astronomy, Greencastle, IN 46135-0037, USAD Kieda - University of Utah Department of Physics and Astronomy, Salt Lake City, UT 84112, USAM Krause - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyS Kumar - University of Delaware Department of Physics and Astronomy and the Bartol Research Institute, Newark, DE 19716, USAM. J Lang - National University of Ireland Galway School of Physics, University Road, Galway, IrelandT. T. Y Lin - McGill University Physics Department, Montreal, QC H3A 2T8, CanadaG Maier - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyP Moriarty - National University of Ireland Galway School of Physics, University Road, Galway, IrelandR Mukherjee - Columbia University Department of Physics and Astronomy, Barnard College, NY 10027, USAD Nieto - Columbia University Physics Department, New York, NY 10027, USAS O'Brien - University College Dublin School of Physics, Belfield, Dublin 4, IrelandR. A Ong - University of California Department of Physics and Astronomy, Los Angeles, CA 90095, USAN Park - University of Chicago Enrico Fermi Institute, Chicago, IL 60637, USAM Pohl - University of Potsdam Institute of Physics and Astronomy, D-14476 Potsdam-Golm, GermanyA Popkow - University of California Department of Physics and Astronomy, Los Angeles, CA 90095, USAE Pueschel - University College Dublin School of Physics, Belfield, Dublin 4, IrelandJ Quinn - University College Dublin School of Physics, Belfield, Dublin 4, IrelandK Ragan - McGill University Physics Department, Montreal, QC H3A 2T8, CanadaP. T Reynolds - Cork Institute of Technology Department of Physical Sciences, Bishopstown, Cork, IrelandG. T Richards - Georgia Institute of TechnologyE Roache - Harvard-Smithsonian Center for Astrophysics Fred Lawrence Whipple Observatory, Amado, AZ 85645, USAJ Rousselle - University of California Department of Physics and Astronomy, Los Angeles, CA 90095, USAA. C Rovero - Instituto de Astronomia y Fisica del Espacio , Casilla de Correo 67-Sucursal 28, (C1428ZAA) Ciudad Autnoma de Buenos Aires, ArgentinaI Sadeh - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyS Schlenstedt - DESY, Platanenallee 6, D-15738 Zeuthen, GermanyG. H Sembroski - Purdue University Department of Physics and Astronomy, West Lafayette, IN 47907, USAK Shahinyan - University of Minnesota School of Physics and Astronomy, Minneapolis, MN 55455, USAD Staszak - University of Chicago Enrico Fermi Institute, Chicago, IL 60637, USAI Telezhinsky - University of Potsdam Institute of Physics and Astronomy, D-14476 Potsdam-Golm, GermanyJ Tyler - McGill UniversityS. P Wakely - University of Chicago Enrico Fermi Institute, Chicago, IL 60637, USAP Wilcox - University of Iowa Department of Physics and Astronomy, Van Allen Hall, Iowa City, IA 52242, USAA Wilhelm - University of Potsdam Institute of Physics and Astronomy, D-14476 Potsdam-Golm, GermanyD. A Williams - University of California Santa Cruz Institute for Particle Physics and Department of Physics, Santa Cruz, CA 95064, USA
- Publication Details
- The Astrophysical journal, v 831(1), p113
- Publisher
- The American Astronomical Society
- Number of pages
- 5
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000400472900004
- Scopus ID
- 2-s2.0-84994235274
- Other Identifier
- 991019201378904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics