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13 papers · 2 filters
A geomagnetic filter for the Fermi-LAT background
D. A. Prokhorov, A. Moraghan
One of the unsolved questions in gamma-ray astronomy is whether the extragalactic gamma-ray background is of the discrete-source origin. To respond to this question, one first need…
NuSTAR Discovery of Dead Quasar Engine in Arp 187
Kohei Ichikawa, Taiki Kawamuro, Megumi Shidatsu +7
Recent active galactic nucleus (AGN) and quasar surveys have revealed a population showing rapid AGN luminosity variability by a factor of . Here we present the most drasti…
Tau lepton asymmetry by sterile neutrino emission -- Moving beyond one-zone supernova models
Anna M. Suliga, Irene Tamborra, Meng-Ru Wu
The mixing of active neutrinos with their sterile counterparts with keV mass is known to have a potentially major impact on the energy loss from the supernova core. By relying on a…
Chandra Spectral and Timing Analysis of Sgr A*'s Brightest X-ray Flares
Daryl Haggard, Melania Nynka, Brayden Mon +17
We analyze the two brightest Chandra X-ray flares detected from Sagittarius A*, with peak luminosities more than 600 x and 245 x greater than the quiescent X-ray emission. The brig…
ALMA Observations of the Terahertz Spectrum of Sagittarius A*
Geoffrey C. Bower, Jason Dexter, Keiichi Asada +11
We present ALMA observations at 233, 678, and 870 GHz of the Galactic Center black hole, Sagittarius A*. These observations reveal a flat spectrum over this frequency range with sp…
Multimessenger Asteroseismology of Core-Collapse Supernovae
John Ryan Westernacher-Schneider, Evan O'Connor, Erin O'Sullivan +4
We investigate correlated gravitational wave and neutrino signals from rotating core-collapse supernovae with simulations. Using an improved mode identification procedure based on…