Gamma-ray signatures of annihilation to charged leptons in dark matter substructure (2009)
Kistler, Matthew D., Siegal-Gaskins, Jennifer M.
Due to their higher concentrations and small internal velocities, Milky Way subhalos can be at least as important as the smooth halo in accounting for the GeV positron excess via dark matter...
Wyithe, Stuart, Hopkins, Andrew M., Kistler, Matthew D., Yuksel, Hasan, Beacom, John F.
The fraction of ionizing photons that escape their host galaxies and so are able to ionize hydrogen in the inter-galactic medium (IGM) is a critical parameter in analyses of the reionization era and...
The Star Formation Rate in the Reionization Era as Indicated by Gamma-ray Bursts (2009)
Kistler, Matthew D., Yuksel, Hasan, Beacom, John F., Hopkins, Andrew M., Wyithe, J. Stuart B.
High-redshift gamma-ray bursts (GRBs) offer an extraordinary opportunity to study aspects of the early Universe, including the cosmic star formation rate (SFR). Motivated by the two recent highest-z...
TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess (2008)
Yuksel, Hasan, Kistler, Matthew D., Stanev, Todor
The Geminga pulsar has long been one of the most intriguing MeV-GeV gamma-ray point sources. We examine the implications of the recent Milagro detection of extended, multi-TeV gamma-ray emission from...
Core-Collapse Astrophysics with a Five-Megaton Neutrino Detector (2008)
Kistler, Matthew D., Yuksel, Hasan, Ando, Shin'ichiro, Beacom, John F., Suzuki, Yoichiro
The legacy of solar neutrinos suggests that large neutrino detectors should be sited underground. However, to instead go underwater bypasses the need to move mountains, allowing much larger contained...
A New Class of Luminous Transients and A First Census of Their Massive Stellar Progenitors (2008)
Thompson, Todd A., Prieto, Jose L., Stanek, K. Z., Kistler, Matthew D., Beacom, John F., Kochanek, Christopher S.
The progenitors of SN 2008S and the luminous 2008 transient in NGC 300 were dust-enshrouded, with extremely red mid-infrared (MIR) colors. In addition, the MIR luminosities of the M85 transient and...
Revealing the High-Redshift Star Formation Rate with Gamma-Ray Bursts (2008)
Yuksel, Hasan, Kistler, Matthew D., Beacom, John F., Hopkins, Andrew M.
While the high-z frontier of star formation rate (SFR) studies has advanced rapidly, direct measurements beyond z ~ 4 remain difficult, as shown by significant disagreements among different results....
Discovery of the dust-enshrouded progenitor of SN 2008S with Spitzer (2008)
Prieto, José L., Kistler, Matthew D., Thompson, Todd A., Yüksel, Hasan, Kochanek, Christopher S., Stanek, Krzysztof Z., ...
We report the discovery of the progenitor of the recent Type IIn SN 2008S in the nearby galaxy NGC 6946. Surprisingly, it was not found in deep, preexplosion optical images of its host galaxy taken...
Circumscribing Late Dark Matter Decays Model Independently (2007)
Yuksel, Hasan, Kistler, Matthew D.
A number of theories, spanning a wide range of mass scales, predict dark matter candidates that have lifetimes much longer than the age of the universe, yet may produce a significant flux of gamma...
An Unexpectedly Swift Rise in the Gamma-ray Burst Rate (2007)
Kistler, Matthew D., Yuksel, Hasan, Beacom, John F., Stanek, Krzysztof Z.
The association of long gamma-ray bursts with supernovae naturally suggests that the cosmic GRB rate should trace the star formation history. Finding otherwise would provide important clues...
Dissecting the Cygnus Region with TeV Gamma Rays and Neutrinos (2007)
Beacom, John F., Kistler, Matthew D.
Recent Milagro observations of the Cygnus region have revealed both diffuse TeV gamma-ray emission and a bright and extended TeV source, MGRO J2019+37, which seems to lack an obvious counterpart at...
Enhanced Cosmological GRB Rates and Implications for Cosmogenic Neutrinos (2006)
Yuksel, Hasan, Kistler, Matthew D.
Gamma-ray bursts, which are among the most violent events in the universe, are one of the few viable candidates to produce ultrahigh energy cosmic rays. Recently, observations have revealed that GRBs...
Guaranteed and Prospective Galactic TeV Neutrino Sources (2006)
Kistler, Matthew D., Beacom, John F.
Recent observations, particularly from the HESS Collaboration, have revealed rich Galactic populations of TeV gamma-ray sources, including a collection unseen in other wavelengths. Many of these...