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24 papers · 1 filter
A novel method for measuring the extragalactic background light: Fermi application to the lobes of Fornax A
Markos Georganopoulos, Rita M. Sambruna, Demosthenes Kazanas +5
We describe a new method for measuring the extragalactic background light (EBL) through the detection of -ray inverse Compton (IC) emission due to scattering of the EBL photons…
A multi-zone model for simulating the high energy variability of TeV blazars
Philip B. Graff, Markos Georganopoulos, Eric S. Perlman +1
We present a time-dependent multi-zone code for simulating the variability of Synchrotron-Self Compton (SSC) sources. The code adopts a multi-zone pipe geometry for the emission re…
On the empirical evidence for the existence of ultra-massive white dwarfs
S. Vennes, A. Kawka
We re-examine the evidence for the existence of ultra-massive (M > 1.1 M_sun) white dwarfs based on gravitational redshift of white dwarfs in common proper motion binaries or in cl…
The pulsating DA white dwarf star EC 14012-1446: results from four epochs of time-resolved photometry
G. Handler, E. Romero-Colmenero, J. L. Provencal +4
The pulsating DA white dwarfs are the coolest degenerate stars that undergo self-driven oscillations. Understanding their interior structure will help to understand the previous ev…
SPH Simulations of Direct Impact Accretion in the Ultracompact AM CVn Binaries
Joshua Dolence, Matt A. Wood, Isaac Silver
The ultracompact binary systems V407 Vul (RX J1914.4+2456) and HM Cnc (RX J0806.3+1527) - a two-member subclass of the AM CVn stars - continue to pique interest because they defy u…
Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058-5234
WET Collaboration, D. J. Sullivan, T. S. Metcalfe +22
We present the analysis of a total of 177h of high-quality optical time-series photometry of the helium atmosphere pulsating white dwarf (DBV) EC 20058-5234. The bulk of the observ…