Search Publications
Broad line emission from iron K- and L-shell transitions in the active galaxy 1H0707-495
Larsson, J.; Young, A. J.; Brandt, W. N. +14 more
Since the 1995 discovery of the broad iron K-line emission from the Seyfert galaxy MCG-6-30-15 (ref. 1), broad iron K lines have been found in emission from several other Seyfert galaxies, from accreting stellar-mass black holes and even from accreting neutron stars. The iron K line is prominent in the reflection spectrum created by the hard-X-ray…
An intermediate-mass black hole of over 500 solar masses in the galaxy ESO243-49
Godet, Olivier; Webb, Natalie A.; Barret, Didier +2 more
Ultraluminous X-ray sources are extragalactic objects located outside the nucleus of the host galaxy with bolometric luminosities exceeding 1039ergs-1. These extreme luminosities-if the emission is isotropic and below the theoretical (Eddington) limit, where the radiation pressure is balanced by the gravitational pressure-imp…
Early assembly of the most massive galaxies
Hilton, Matt; Stott, John P.; West, Michael J. +15 more
The current consensus is that galaxies begin as small density fluctuations in the early Universe and grow by in situ star formation and hierarchical merging. Stars begin to form relatively quickly in sub-galactic-sized building blocks called haloes which are subsequently assembled into galaxies. However, exactly when this assembly takes place is a…
The first decade of science with Chandra and XMM-Newton
Weisskopf, Martin C.; Schartel, Norbert; Santos-Lleo, Maria +2 more
NASA's Chandra X-ray Observatory and the ESA's X-ray Multi-Mirror Mission (XMM-Newton) made their first observations ten years ago. The complementary capabilities of these observatories allow us to make high-resolution images and precisely measure the energy of cosmic X-rays. Less than 50years after the first detection of an extrasolar X-ray sourc…