Search Publications
Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
Read, A. M.; Knigge, C.; Heywood, I. +11 more
In the past two decades, high-amplitude electromagnetic outbursts have been detected from dormant galaxies and often attributed to the tidal disruption of a star by the central black hole1,2. X-ray emission from the Seyfert 2 galaxy GSN 069 (2MASX J01190869-3411305) at a redshift of z = 0.018 was first detected in July 2010 and implies …
A dominant population of optically invisible massive galaxies in the early Universe
Elbaz, D.; Franco, M.; Shu, X. +9 more
Our current knowledge of cosmic star-formation history during the first two billion years (corresponding to redshift z > 3) is mainly based on galaxies identified in rest-frame ultraviolet light1. However, this population of galaxies is known to under-represent the most massive galaxies, which have rich dust content and/or old stella…
Observation of inverse Compton emission from a long γ-ray burst
Maraschi, L.; Troja, E.; Piro, L. +304 more
Long-duration γ-ray bursts (GRBs) originate from ultra-relativistic jets launched from the collapsing cores of dying massive stars. They are characterized by an initial phase of bright and highly variable radiation in the kiloelectronvolt-to-megaelectronvolt band, which is probably produced within the jet and lasts from milliseconds to minutes, kn…
A magnetar-powered X-ray transient as the aftermath of a binary neutron-star merger
Lehmer, B. D.; Bauer, F. E.; Brandt, W. N. +14 more
Mergers of neutron stars are known to be associated with short γ-ray bursts1-4. If the neutron-star equation of state is sufficiently stiff (that is, the pressure increases sharply as the density increases), at least some such mergers will leave behind a supramassive or even a stable neutron star that spins rapidly with a strong magneti…
A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
Coil, Alison; Moustakas, John; Diamond-Stanic, Aleksandar M. +9 more
Ninety per cent of baryons are located outside galaxies, either in the circumgalactic or intergalactic medium1,2. Theory points to galactic winds as the primary source of the enriched and massive circumgalactic medium3-6. Winds from compact starbursts have been observed to flow to distances somewhat greater than ten kiloparse…
A recurrent nova super-remnant in the Andromeda galaxy
Ness, J. -U.; Henze, M.; Shafter, A. W. +15 more
The accretion of hydrogen onto a white dwarf star ignites a classical nova eruption1,2—a thermonuclear runaway in the accumulated envelope of gas, leading to luminosities up to a million times that of the Sun and a high-velocity mass ejection that produces a remnant shell (mainly consisting of insterstellar medium). Close to the upper m…
The seventh inner moon of Neptune
Showalter, M. R.; de Pater, I.; Lissauer, J. J. +1 more
During its 1989 flyby, the Voyager 2 spacecraft imaged six small moons of Neptune, all with orbits well interior to that of the large, retrograde moon Triton1. Along with a set of nearby rings, these moons are probably younger than Neptune itself; they formed shortly after the capture of Triton and most of them have probably been fragme…