Conveners
Analysis techniques II: Catalogs
- David Paneque (Max Planck Institute for Physics)
The current Fermi-LAT source catalog (3FGL: 3033 sources above 100 MeV) and interstellar emission model were based on four years of Pass 7 data. The more recent 3FHL catalog was restricted to energies larger than 10 GeV. The next full LAT source catalog (4FGL) will be based on 8 years of Pass 8 data. With this much larger statistics, below a few GeV the source detection and characterization is...
Particle acceleration to relativistic energies is common in the Universe. A wealth of astrophysical accelerators have been identified over the past decades using gamma-ray observations. Particularly interesting are time variable sources, where the acceleration and radiation processes can be observed over time. Recently, the LAT collaboration has published a second catalog of flaring gamma-ray...
In this contribution we present studies to quantify the effects of possible biases in diffuse emission models for LAT data on point-source finding and spectral parameter extraction. In particular, 1) we examine differences in source lists obtained in a 40 degree by 40 degree region around the Galactic center (GC region) using different interstellar emission models (IEMs), 2) examine the...
Previous analyses of point sources in the gamma-ray range were done only below 30 MeV (COMPTEL) or above 100 MeV (Fermi-Large Area Telescope, EGRET). Below 30 MeV, the imaging Compton telescope (COMPTEL) onboard NASA's Compton Gamma-Ray Observatory detected 26 steady sources in the energy range from 0.70 to 30 MeV. At high energy, the LAT, on board the Fermi satellite, detects more than...
Novel gamma-ray telescope schemes are under development so as to bridge the 0.1-100 MeV sensitivity gap of gamma-ray astronomy (Compton, pair creation), (silicon wafer stacks, emulsions, gas detectors).
The lower average density with respect, e.g. to the tungsten/silicon active target of the Fermi-LAT makes square-meter effective area telescopes voluminous objects, for which the photon energy...
