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19 papers · 1 filter
GRANDMA Observations of ZTF/Fink Transients during Summer 2021
V. Aivazyan, M. Almualla, S. Antier +80
We present our follow-up observations with GRANDMA of transient sources revealed by the Zwicky Transient Facility (ZTF). Over a period of six months, all ZTF triggers were examined…
A -ray determination of the Universe's star-formation history
LAT Collaboration, M. Ajello, K. Helgason +4
The light emitted by all galaxies over the history of the Universe produces the extragalactic background light (EBL) at ultraviolet, optical, and infrared wavelengths. The EBL is a…
2FHL J0826.1-4500: Discovery of a possible shock-cloud interaction on the Western edge of the Vela SNR
Jordan Eagle, Stefano Marchesi, Daniel Castro +3
We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50GeV using the Large Area Telescope (LAT) on board the Fermi-LAT. Thi…
Magnetic field strength of a neutron-star-powered ultraluminous X-ray source
Murray Brightman, Fiona A. Harrison, Felix Fuerst +7
Ultraluminous X-ray sources (ULXs) are bright X-ray sources in nearby galaxies not associated with the central supermassive black hole. Their luminosities imply they are powered by…
NuSTAR discovery of an unusually steady long-term spin-up of the Be binary 2RXP J130159.6-635806
Roman A. Krivonos, Sergey S. Tsygankov, Alexander A. Lutovinov +14
We present spectral and timing analysis of NuSTAR observations of the accreting X-ray pulsar 2RXP J130159.6-635806. The source was serendipitously observed during a campaign focuse…
A fast and long-lived outflow from the supermassive black hole in NGC 5548
J. S. Kaastra, G. A. Kriss, M. Cappi +31
Supermassive black holes in the nuclei of active galaxies expel large amounts of matter through powerful winds of ionized gas. The archetypal active galaxy NGC 5548 has been studie…