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New Class of High-Energy Transients from Crashes of Supernova Ejecta with Massive Circumstellar Material Shells
Kohta Murase, Todd A. Thompson, Brian C. Lacki +1
A new class of core-collapse supernovae (SNe) has been discovered in recent years by optical/infrared surveys; these SNe suggest the presence of one or more extremely dense (~10^5-…
The Gamma-Ray Background Constrains the Origins of the Radio and X-Ray Backgrounds
Brian C. Lacki
Cosmic ray protons generate gamma-rays, neutrinos, and secondary electrons and positrons (e+/-) through pion-producing collisions with gas atoms. Any synchrotron or Inverse Compton…
Diffuse Hard X-ray Emission in Starburst Galaxies as Synchrotron from Very High Energy Electrons
Brian C. Lacki, Todd A. Thompson
[Abdriged] The origin of the diffuse hard X-ray (2 - 10 keV) emission from starburst galaxies is a long-standing problem. We suggest that synchrotron emission of 10 - 100 TeV elect…
The End of the Rainbow: What Can We Say About the Extragalactic Sub-Megahertz Radio Sky?
Brian C. Lacki
The Galactic disc is opaque to radio waves from extragalactic sources with frequencies nu less than ~3 MHz. However, radio waves with kHz, Hz, and even lower frequencies may propag…
Primordial Black Holes as Dark Matter: Almost All or Almost Nothing
Brian C. Lacki, John F. Beacom
Primordial black holes (PBHs) are expected to accrete particle dark matter around them to form ultracompact minihalos (UCMHs), if the PBHs themselves are not most of the dark matte…
On The GeV & TeV Detections of the Starburst Galaxies M82 & NGC 253
Brian C. Lacki, Todd A. Thompson, Eliot Quataert +2
The GeV and TeV emission from M82 and NGC 253 observed by Fermi, HESS, and VERITAS constrains the physics of cosmic rays (CRs) in these dense starbursts. We argue that the gamma ra…