Research Highlights

Jun 22, 2015 | Where are they now? 
 -- An Interview with KIPAC alum Aurelien Bouvier

In the series, "Where are they now?" we check in with KIPAC alumni: where they are now, how they've fared since their days exploring particle astrophysics and cosmology at the Institute, and how their KIPAC experiences have shaped their journeys.

Jun 18, 2015 | Detecting black hole gravitational atoms in the sky (with half-diamonds)

Our world is made up of atoms: i.e. nuclei and electrons held together by electromagnetism. At the same time, though not all particles have electric charge, they all have a gravitational “charge” (i.e. their mass). And gravity is universal and attractive. So it is only natural to ask: why don’t we observe any "atoms" bound by gravity? The answer is that gravity is weak: a small magnet can lift a nail against the gravitational pull of the entire earth. The weakness of gravity means that a gravitational “hydrogen atom” would have a radius larger than the size of the observable universe. Thus to make a gravitational atom, we need to look to places where gravity is strong—like around black holes!

Jun 2, 2015 | Where are they now? 
 -- An Interview with KIPAC alum Chihway Chang

In the series, "Where are they now?" we check in with KIPAC alumni: where they are now, how they've fared since their days exploring particle astrophysics and cosmology at the Institute, and how their KIPAC experiences have shaped their journeys.

May 5, 2015 | Hard X-rays Reveal Powerful Objects Near and Far

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

May 5, 2015 | Fermi Telescope Sees Blazin' Blazar

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.

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 | Pulsar Science With Gamma Rays That Are Seen and Not Seen

Among the successes of the Fermi Gamma-ray Space Telescope is its discovery of the gamma-ray emission from many pulsars, the fascinating beacons in space. Additionally, KIPAC scientists have also used what Fermi has not seen from some pulsars to learn more about them.

May 5, 2015 | Fermi Sees Giant Gamma-Ray 'Bubbles' in the Milky Way

The Fermi Gamma-Ray Space Telescope has seen giant unexpected gamma-ray structures in the center of our Milky Way galaxy. The structures, which protrude above and below the Galactic plane in the center of the Galaxy like two opposing bubbles being blown up, are approximately 50,000 light-years tall.

An all-sky map of gamma-ray emission as seen by the Fermi LAT, showing the Galactic diffuse component and the bubbles.

May 5, 2015 | Let the Sun Shine (In Gamma Rays)

The Fermi Gamma-ray Space Telescope, famous for probing the Galaxy and distant reaches of the Universe, has now seen its first flare from our own Sun.

Ultraviolet light image of a solar flare, seen as a bright patch by NASA's Solar Dynamics Observatory (SDO) satellite. One of the three main instruments on SDO was built at Stanford.

May 5, 2015 | Fermi Space Telescope Sees the Andromeda Galaxy

For the first time, thanks to the Fermi Space Telescope, high energy gamma rays gave been detected coming from another spiral galaxy much like our own Milky Way. It is now evident that the differences in gamma-ray luminosity among galaxies show that the density of cosmic rays varies and is correlated with the formation of new stars.

May 5, 2015 | Scientists TCB With Simulated GRBs

By realistically simulating a population of gamma-ray bursts, KIPAC scientists have demonstrated the extent to which these explosions can be mischaracterized when they are far away.

The observed duration of a GRB pulse as a function of distance (redshift) for both an ideal (Without Noise) and a realistic (With Noise) observing instrument. The actual observed duration deviates from the expected duration.

May 5, 2015 | The Arias of Universes in a Box

Simulating the evolution of the early Universe on computers is the starting point for cosmologists' understanding of structure formation in the cosmos. With techniques to pursue both a large volume of simulated universe and high spatial resolution, KIPAC researchers are leading the charge against one of the foremost computational challenges in astrophysics.