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Detection of Very Low-Frequency Quasi-Periodic Oscillations in the 2015 Outburst of V404 Cygni
D. Huppenkothen, G. Younes, A. Ingram +12
In June 2015, the black hole X-ray binary (BHXRB) V404 Cygni went into outburst for the first time since 1989. Here, we present a comprehensive search for quasi-periodic oscillatio…
The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift and XMM-Newton
A. Papitto, E. Bozzo, C. Sanchez-Fernandez +5
We report on INTEGRAL, Swift and XMM-Newton observations of IGR J17511-3057 performed during the outburst that occurred between March 23 and April 25, 2015. The source reached a pe…
Detection of burning ashes from thermonuclear X-ray bursts
J. J. E. Kajava, J. Nättilä, J. Poutanen +3
When neutron stars (NS) accrete gas from low-mass binary companions, explosive nuclear burning reactions in the NS envelope fuse hydrogen and helium into heavier elements. The resu…
Investigation of the energy dependence of the orbital light curve in LS 5039
Z. Chang, S. Zhang, L. Ji +5
LS 5039 is so far the best studied -ray binary system at multi-wavelength energies. A time resolved study of its spectral energy distribution (SED) shows that above 1 keV its po…
Hard X-ray variability of V404 Cyg during the 2015 outburst
C. Sanchez-Fernandez, J. J. E. Kajava, S. E. Motta +1
Aims. Hard X-ray spectra of black hole binaries (BHB) are produced by Comptonization of soft seed photons by hot electrons near the black hole. The slope of the resulting ray spect…
The black hole binary V404 Cygni: an obscured AGN analogue
S. E. Motta, J. J. E. Kajava, C. Sánchez-Fernández +2
Typical black hole binaries in outburst show spectral states and transitions, characterized by a clear connection between the inflow onto the black hole and outflow from its vicini…
Evidence of spreading layer emission in thermonuclear superbursts
K. I. I. Koljonen, J. J. E. Kajava, E. Kuulkers
When a neutron star accretes matter from a companion star in a low-mass X-ray binary, the accreted gas settles onto the stellar surface through a boundary/spreading layer. On rare…
Furiously Fast and Red: Sub-second Optical Flaring in V404 Cyg during the 2015 Outburst Peak
P. Gandhi, S. P. Littlefair, L. K. Hardy +25
We present observations of rapid (sub-second) optical flux variability in V404 Cyg during its 2015 June outburst. Simultaneous three-band observations with the ULTRACAM fast imager…