KIPAC scientists have used Fermi Gamma-ray Space Telescope observations to detect a flare in a distant active galaxy, with it becoming temporarily the brightest gamma-ray source in the entire sky, and indicating the most luminous object, aside from gamma-ray bursts, discovered in the Universe to date. Artist's conception of an AGN. When the distant galaxy is... Read More
Creating the first ever catalog of the entire Galactic plane in hard x-rays, a KIPAC scientist has paved the way for a deeper understanding of the most luminous compact objects in our Galaxy, and of the x-ray emission from other galaxies. Map of catalogued hard x-ray emitters in the Galactic center region with their significance in signal to noise Being high... Read More
The Fermi LAT has observed, for the first time, gamma-rays produced in cosmic-ray interactions in several neighboring galaxies - and is even able to spatially resolve one of those galaxies. This has given us a unique global view of cosmic ray acceleration, that previous Milky Way studies could not provide. Gamma-ray emission from the LMC While the Fermi LAT has... Read More
By Andrea Albert   In the hunt for dark matter, any information to help us narrow in on what to look for is key.  Miguel Sánchez-Conde (KIPAC and Stockholm University) and Francisco Prada (IFT/UAM, Madrid) have just published a crucial clue, concerning the concentration of dark matter halos, which are self-gravitating accumulations of dark matter that host systems... Read More
The only way to accurately predict the conditions near black holes is with extensive computer simulations of the complicated physics involved. While black holes are the quintessential manifestation of Einstein's General Relativity, very few precision tests of the theory have been based on actual observations of black holes. New simulation results point to an... Read More
  In recent years a dozen small 'dwarf' galaxies that surround our Milky Way have been discovered. A KIPAC team shows how these tiny galaxies are great places to look for the signatures of dark matter and determine its properties. The most natural theories of dark matter posit it to be a particle that interacts weakly with ordinary matter, and surrounds the... Read More
Clusters of galaxies are the most massive structures in the universe. Most of the mass in these clusters is considered to be dark matter. The Fermi LAT monitors these clusters for a gamma-ray signal from dark matter annihilation. No such signal has been found yet, but the non-observation starts to constrain a wide range of proposed dark matter models. Clusters of... Read More
Huge natural thermonuclear explosions, so called stellar novae, are observed in binary systems consisting of a dense compact white dwarf circling a star. The Fermi LAT has for the first time ever detected gamma-ray emission from such an event. This observation indicates particle acceleration in the shock wave produced by the nova explosion to at least GeV energies.... Read More
It has long been suspected that the processes at the center of active galaxies prevent the gas from forming stars. Now, for the first time, a KIPAC team has seen that happening before our eyes. One of the seeming paradoxes of astrophysics is that stars form because something got colder.  Only cold gas can sink into a gravitational potential and coalesce to form a... Read More
Long (up to Megaparsec scale), highly collimated jets of magnetized plasma emanating from the active nuclei of galaxies pose many astrophysical puzzles - including the mechanism by which those outflows are accelerated to relativistic velocities, and the structure of the jet magnetic field. Recent high resolution X-ray imaging of the jet in famous radio galaxy Pictor... Read More