Search Publications
Constraints on cosmological models from strong gravitational lensing systems
Cao, Shuo; Biesiada, Marek; Zhu, Zong-Hong +2 more
Strong lensing has developed into an important astrophysical tool for probing both cosmology and galaxies (their structure, formation, and evolution). Using the gravitational lensing theory and cluster mass distribution model, we try to collect a relatively complete observational data concerning the Hubble constant independent ratio between two an…
Unidentified sources in the Fermi-LAT second source catalog: the case for DM subhalos
Horns, Dieter; Zechlin, Hannes-S.
The Large Area Telescope (LAT) aboard the Fermi satellite allows us to study the high-energy γ-ray sky with unprecedented sensitivity. However, the origin of 31% of the detected γ-ray sources remains unknown. This population of unassociated γ-ray sources may contain new object classes, among them sources of photons from self-annihilating or decayi…
Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations
Martin, Pierrick; Vincent, Aaron C.; Cline, James M.
We compare the full-sky morphology of the 511 keV gamma ray excess measured by the INTEGRAL/SPI experiment to predictions of models based on dark matter (DM) scatterings that produce low-energy positrons: either MeV-scale DM that annihilates directly into e+e- pairs, or heavy DM that inelastically scatters into an excited sta…
The rates and time-delay distribution of multiply imaged supernovae behind lensing clusters
Richard, Johan; Hjorth, Jens; Li, Xue
Time delays of gravitationally lensed sources can be used to constrain the mass model of a deflector and determine cosmological parameters. We here present an analysis of the time-delay distribution of multiply imaged sources behind 17 strong lensing galaxy clusters with well-calibrated mass models. We find that for time delays less than 1000 days…