D. J. Suson
A5071946813- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- thermodynamics and calorimetric analyses
- Superconducting and THz Device Technology
- Radioactivity and Radon Measurements
- Crystallography and Radiation Phenomena
Purdue University Northwest
2014-2023
Fermi National Accelerator Laboratory
2012-2022
Max Planck Society
2018
Institució Catalana de Recerca i Estudis Avançats
2016
The Ohio State University
2012
California Institute of Technology
2012
Purdue University West Lafayette
2010
Institute of Space and Astronautical Science
2009
Texas A&M University – Kingsville
1995-2002
Texas A&M University
1993
Due to their proximity, high dark-matter content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection dark matter. Recently, eight new dSph candidates were discovered using first year data from Dark Energy Survey (DES). We searched gamma-ray emission coincident with positions these objects in six years Fermi Large Area Telescope data. found no significant excesses emission. Under assumption that...
Abstract We present a search for spatial extension in high-latitude ( ) sources recent Fermi point source catalogs. The result is the High-Latitude Extended Sources Catalog, which provides extensions (or upper limits thereof) and likelihood profiles suite of tested morphologies. find 24 extended sources, 19 were not previously characterized as extended. These include that are potentially associated with supernova remnants star-forming regions. also found γ -ray emission vicinity Cen A radio...
An incremental version of the fourth catalog active galactic nuclei (AGNs) detected by Fermi-Large Area Telescope is presented. This (4LAC-DR3) derives from third data release 4FGL based on 12 years E>50 MeV gamma-ray data, where spectral parameters, energy distributions (SEDs), yearly light curves, and associations have been updated for all sources. The new reported AGNs include 587 blazar candidates four radio galaxies. We describe properties sample outline changes affecting previously...
The nearby Large Magellanic Cloud (LMC) provides a rare opportunity of spatially resolved view an external star-forming galaxy in gamma-rays. LMC was detected at 0.1-100GeV as extended source with CGRO/EGRET and using early observations the Fermi-LAT. emission found to correlate massive regions be particularly bright towards 30 Doradus. Studies origin transport cosmic rays (CRs) Milky Way are frequently hampered by line-of-sight confusion poor distance determination. offers complementary way...
Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, unbind gas from stellar bulges galaxies. These may be responsible for observed scaling relation between masses central and velocity dispersion stars in galactic bulges. Propagating through galaxy, wind should interact with interstellar medium creating a strong shock, similar to those supernovae explosions, which is able accelerate charged particles high energies. In this work we...
During its first year of data taking, the Large Area Telescope (LAT) onboard Fermi Gamma-Ray Space has collected a large sample high-energy cosmic-ray electrons and positrons (CREs). We present results directional analysis CRE events, in which we searched for flux excess correlated with direction Sun. Two different complementary approaches were implemented, neither yielded evidence significant from derive upper limits on Sun's direction, use these bounds to constrain two classes dark matter...
Detailed Monte Carlo simulations of the electromagnetic component extensive air showers generated by ${10}^{14}$--${10}^{16}$-eV protons and iron nuclei have been carried out. The longitudinal development lateral distribution electron was approximated with parametrized analytical formulas, compared for proton- iron-initiated showers.
A 2.1-year periodic oscillation of the gamma-ray flux from blazar PG 1553+113 has previously been tentatively identified in almost 7 year data Fermi Large Area Telescope. After 15 years sky-survey observations, doubling total time range, we report >7 cycle modulation with an estimated significance 4 sigma against stochastic red noise. Independent determinations period and phase earlier new are close agreement (chance probability <0.01). Pulse timing over full light curve is also consistent a...
One of the most interesting yet least explored areas astrophysics is gamma ray portion electromagnetic spectrum. astronomy's significant efforts has been Compton Gamma Ray Observatory launched in 1991. Scientists from 21 institutions worldwide are now refining newest instrument, Large Area Space Telescope (Glast), which will continue CGRO's work. Our group involved primarily with software issues, particularly an object-oriented Monte Carlo package called Gismo, modeled all aspects...
In eight years of operation, the Fermi Large Area Telescope (LAT) has detected a large sample cosmic-ray protons. The LAT's wide field view and full-sky coverage make it an excellent instrument for studying anisotropy in arrival directions protons at all angular scales. These capabilities enable LAT to 2D measurement proton complementary many recent TeV measurements, which are only sensitive right ascension component anisotropy. Any probes structure local interstellar magnetic or could...
Abstract The Fermi Large Area Telescope (LAT) has amassed a large data set of primary cosmic-ray protons throughout its mission. In fact, it is the largest identified ever collected at this energy. LAT’s wide field view and full-sky survey capabilities make an excellent instrument for studying anisotropy. As space-based instrument, LAT sensitive to anisotropy in both R.A. decl., while ground-based observations only measure We present results first-ever proton search using LAT. was over eight...
An incremental version of the fourth catalog active galactic nuclei (AGNs) detected by Fermi-Large Area Telescope is presented. This (4LAC-DR3) derives from third data release 4FGL based on 12 years E>50 MeV gamma-ray data, where spectral parameters, energy distributions (SEDs), yearly light curves, and associations have been updated for all sources. The new reported AGNs include 587 blazar candidates four radio galaxies. We describe properties sample outline changes affecting previously...
familiar interface to the user (as used in CRAB Analysis Tool[7]) and allow an easy transition Tier-0 system. While CRABServer component had been initially designed for Grid analysis by CMS end-users, with a few modifications it turned out be also very powerful service manage monitor local submissions on CAF. Transition has guaranteed usage of WMCore, library developed common core workload management tools, handing data driven workflow dependencies. This system is now being first use cases,...
A full size, liquid scintillating fiber spaghetti, hadronic calorimeter has been constructed and tested using cosmic rays at Texas A&M University. The purpose of this R&D research is to find practical solutions for detectors be used in extremely high radiation environments. details design construction module are presented. advantages materials were investigated. Relevant subjects addressed. Cosmic ray test results compared with that GEANT Monte Carlo simulations. Over all, they agree each...
A full size liquid scintillating fiber spaghetti-hadronic calorimeter has been constructed and tested using cosmic rays at Texas A&M University. The purpose of this research is to find practical solutions for detectors be used in extremely high radiation environments. details design construction module are presented. advantages materials were investigated. Relevant subjects addressed. Cosmic ray test results compared with that GEANT Monte Carlo simulations. Over all, they agree well each...
One of the leading candidate technologies being considered for use in forward region at both Superconducting Supercollider and Large Hadron Collider is liquid scintillating fiber spaghetti calorimetry which fibers are constructed using scintillator as core combination with a tube or channel lower refractive index cladding. In this report, R&D results on some most critical issues will be reviewed, including findings concerning attenuation lengths radiation damage. Results from situ tests used...
The distinguishing of point-like man made gamma ray sources from point like astrophysical or cosmological can be achieved by analyzing the line structure spectrum in 0.5 - 10 MeV energy range. A special computer program has been developed for this analysis and tested Monte Carlo simulations. An application method burster manifestations superconducting cosmic strings using High Resolution Gamma Ray Telescope UTD/UCLA collaboration.