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. The intensity of gamma-rays... Read More
A KIPAC astrophysicist has published some of the first constraints on dark energy and other cosmological parameters using the measured signal from "shadows" of galaxy clusters in the CMB. The Atacama Cosmology Telescope (ACT), located in the Atacama desert in Chile. Multiple probes of the Universe’s expansion rate suggest a concordant model where dark matter and... Read More
The question of whether we receive microwave radiation from spinning dust grains in our Galaxy has been debated for 15 years. A collaboration including a KIPAC scientist has provided valuable data indicating that the answer is probably yes. The ARCADE 2 instrument being launched on a high altitude balloon. Getting above the atmosphere is important in an absolute... Read More
Of the four established ways to study dark matter astronomically, looking at the evolving properties of galaxy clusters is the most reliant on non-optical observations of our Universe. A KIPAC faculty member has proposed satellite observations for a new era of cluster constraints on dark energy. One of the major questions in contemporary physics and astronomy is the... Read More
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,... Read More
The Crab Nebula is a system with a pulsar and a surrounding ball of material that emits light all across the electromagnetic spectrum. For many years it was thought to be a constant steady source and was used as a calibration reference for telescopes. Now, KIPAC scientists using the Fermi Space telescope have shown that the emission from the Crab in gamma rays varies... Read More
Galaxy clusters are a well known source of X-rays. KIPAC researchers have shown that at least one cluster, the famous 'Bullet' Cluster, has an extra component of X-ray emission detectable beyond the dominant one seen ubiquitously elsewhere. The measured X-ray spectrum of the Bullet Cluster as determined by Ajello and collaborators, along with the best fit spectrum... Read More
A team of astronomers, including two from KIPAC, have created a map of X-ray emission from around the central galaxy of a galaxy group. Along with data from other wavelengths, it dramatically shows the effects of outbursts from the central active galactic nucleus that occurred millions of years ago. Image of X-ray emission from around NGC 5813, with the galaxy... Read More
A team of KIPAC astrophysicists has applied a rigorous statistical analysis to observations of quasars resulting in an interesting perspective. An example of a bias arising from data truncation. In this plot of radio luminosity versus redshift (distance) for quasars detected by a survey, inherently faint objects can only be seen if they are close (low redshift).... Read More
KIPAC astrophysicists have used a technique that processes information in a way analogous to the human brain in order to determine whether galaxy shapes can help determine their place in the Universe. The effect of adding multiple parameters representing galaxy shape information on the photo-z accuracy, as determined by Singal et al. with their neural network... Read More