Research Highlights

May 5, 2015 | Missing Dark Matter Satellites Still Missing

Simulations based on our current understanding of dark matter predict a larger number of small dwarf satellite galaxies around our Milky Way than are observed. Now work by KIPAC scientists has shown that this discrepancy is more universal.

This early image of the very nearby Andromeda Galaxy, published in 1899, shows several dwarf satellite galaxies around it.

May 5, 2015 | The Basics of ASICs for ASTRO-H

KIPAC scientists, in collaboration with international colleagues, are developing a gamma-ray spectrometer for the ASTRO-H satellite, to open a new frontier for investigating the high energy Universe.

Circuit diagram of the ASIC developed for the SGD. The charge is amplified by the charge sensitive amplifier (CSA), two shapers form the shape of the pulse in time, and the ADC digitizes the signal.

May 5, 2015 | Knowing The Telescope Before It Is Built

By the end of the decade, the Large Synoptic Survey Telescope (LSST) will begin gazing at the sky and revolutionizing the study of dark energy and astronomy. Today, however, scientists are already hard at work learning how to analyze LSST's unprecedented amount and complexity of data with the Image Simulator.

May 5, 2015 | Cutting-Edge Physics Computing Is No Game

Ever resourceful, physicists, including several KIPAC scientists, have been using the specialized processors in computer graphics display cards to speed up some of the calculations that arise in data analysis. In the coming era of large astronomical surveys for weak lensing constraints on dark energy, such speed will be essential.

May 5, 2015 | A Gamma-ray Pulsar With a Record-breaking Magnetic Field

Fermi's Large Area Telescope has detected gamma-ray pulsations from a radio pulsar with one of the highest magnetic fields known. The object appears to be a missing link between standard pulsars and the more extreme magnetars.

May 5, 2015 | Fermi Investigates Dark Matter With Gamma Rays and Mini Galaxies

By turning their gaze to small satellite galaxies where the total mass is most dominated by dark matter, astrophysicists using data from the Fermi Gamma-ray Space Telescope have achieved the tightest constraints on the properties of dark matter particles to date.

May 5, 2015 | Fermi Identifies Cosmic Antiparticles in the Shadow of the Earth

Although the Fermi Gamma-ray Space Telescope is primarily a gamma-ray instrument, its most cited paper reports a measurement of the combined electron and positron cosmic-ray spectrum. Now a team, led by KIPAC researchers, has built on this result by using a novel technique to separate the cosmic-ray electrons and positrons and measure the spectrum of each component individually. The result will keep theorists busy thinking about pulsars and dark matter.

May 5, 2015 | Fermi LAT observes the core and giant lobes of the close-by radio galaxy Centaurus A

Centaurus A (Cen A) is one of the brightest radio sources in the sky: it is a giant elliptical Galaxy about 10 million light years away, making it the closest active galaxy we know. A remarkable feature of the radio image of this galaxy is that the bright central source is accompanied by a pair of giant radio "lobes," thought to be fuelled by relativistic jets generated in the dynamical process of gas accretion around the super-massive black hole residing at the galaxy's center.

May 5, 2015 | A Cosmic Snapshot With a Possible Double Barrel Active Galaxy

Active galactic nuclei reveal the presence of enormous amounts of matter interacting with a supermassive black hole at the center of a galaxy. Because galaxies merge over the history of the Universe, we should see the signatures of supermassive black holes merging in some places. An analysis of X-ray observations may have shown just that.

May 5, 2015 | Astronomy and Particle Physics Theory Meet Again in Dark Matter Lines

Gamma-ray observations of the Universe by the Fermi Gamma-ray Space Telescope have enabled another astrophysical constraint on the properties of particle dark matter.

The Fermi Gamma-ray Space Telescope continues to bridge astronomy and particle physics.

May 5, 2015 | New Results from Simulations of the Complicated Physics Around Black Holes Point to a Possible Test of Einstein's Theory of Gravity

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 observable property of such systems that could be used as a precision test of Einstein's theory.

May 5, 2015 | Giant Black Hole Caught in the Act of Preventing Future Stars

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.