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A case for a binary black hole system revealed via quasi-periodic outflows

Steiner, James F.; Holoien, Thomas W. -S.; Daylan, Tansu +33 more

Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely challenging. Here, we report quasi-periodic variability in x-ray absorption, which we interpret as quasi-periodic outflows (QPOuts) from a previously low-luminosity active ga…

A structured jet explains the extreme GRB 221009A

Kouveliotou, Chryssa; Buckley, David A. H.; Hammerstein, Erica +29 more

Long-duration gamma-ray bursts (GRBs) are powerful cosmic explosions, signaling the death of massive stars. Among them, GRB 221009A is by far the brightest burst ever observed. Because of its enormous energy ( E iso ≈ 10 55 erg) and proximity ( z ≈ 0.15), GRB 221009A is an exceptionally rare event that pushes the limits of our theories. We present…

A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism

Göğüş, Ersin; Li, Di; Zhu, Weiwei +34 more

The megajansky radio burst, FRB 20200428, and other bright radio bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast radio bursts (FRBs), but the emission site and mechanism of FRB-like bursts are still unidentified. Here, we report the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20…

Revealing the source of Jupiter's x-ray auroral flares

Ness, Jan-Uwe; Kraft, Ralph; Sulaiman, Ali H. +22 more

Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar

de Palma, Francesco; Fusco, Piergiorgio; Gargano, Fabio +129 more

Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsations have been detected from all rotation-powered MSPs. In an attempt to discover radio-quiet gamma-ray MSPs, we used the aggregated power from the computers of tens of …