D. Lennarz
A5057812090- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Astrophysical Phenomena and Observations
- Radiation Therapy and Dosimetry
- Cosmology and Gravitation Theories
- SAS software applications and methods
- Arctic and Antarctic ice dynamics
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Noncommutative and Quantum Gravity Theories
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Astronomy and Astrophysical Research
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
Michigan State University
2016-2021
Georgia Institute of Technology
2013-2021
Barnard College
2021
Universidade Federal de São Carlos
2021
Universidade de São Paulo
2021
George Mason University
2021
Universidad de León
2021
Colorado State University
2021
Instituto Politécnico Nacional
2021
Center for Research and Advanced Studies of the National Polytechnic Institute
2021
Exotic origin for cosmic positrons Several cosmic-ray detectors have found more arriving at Earth than expected. Some researchers interpret this as a signature of exotic physics, such the annihilation dark matter particles. Others prefer mundane explanation that involves positron generation pulsars followed by diffusion to Earth. Abeysekara et al. detected extended emission gamma rays around two nearby pulsars, generated high-energy electrons and positrons. The size was used calculate how...
The Crab Nebula is the brightest TeV gamma-ray source in sky and has been used for past 25 years as a reference astronomy, calibration verification of new instruments. High Altitude Water Cherenkov Observatory (HAWC), completed early 2015, to observe at high significance across nearly full spectrum energies which HAWC sensitive. unique its wide field-of-view, 2 sr any instant, high-energy reach, up 100 TeV. HAWC's sensitivity improves with energy. Above $\sim$1 driven by best background...
We present the first catalog of TeV gamma-ray sources realized with recently completed High Altitude Water Cherenkov Observatory (HAWC). It is most sensitive wide field-of-view telescope currently in operation, a 1-year survey sensitivity ~5-10% flux Crab Nebula. With an instantaneous field view >1.5 sr and >90% duty cycle, it continuously surveys monitors sky for gamma ray energies between hundreds GeV tens TeV. HAWC located Mexico at latitude 19 degree North was March 2015. Here, we 2HWC...
Abstract The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field of view sensitive to 500 GeV–100 TeV gamma-rays and cosmic rays. It can also perform diverse indirect searches for dark matter annihilation decay. Among the most promising targets detection are dwarf spheroidal galaxies. These objects expected have few astrophysical sources but high content, making them ideal candidates an with gamma-rays. Here we present individual limits on cross section decay lifetime...
The High-Altitude Water Cherenkov (HAWC) Observatory is sensitive to gamma rays and charged cosmic at TeV energies.The detector still under construction, but data acquisition with the partially deployed started in 2013.An analysis of cosmic-ray arrival direction distribution based on 4.9 × 10 events recorded between June 2013 February 2014 shows anisotropy -4 level angular scales about • .The HAWC sky map exhibits three regions significantly enhanced flux; two these were first reported by...
The HAWC experiment reports the first ground-based measurement of all-particle cosmic-ray spectrum in 10-500 TeV energy range. This data overlaps with direct measurements made by balloon-borne detectors as well those other higher air-shower detectors. closes an important gap between these different experiments.
We present results from daily monitoring of gamma rays in the energy range $\sim0.5$ to $\sim100$ TeV with first 17 months data High Altitude Water Cherenkov (HAWC) Observatory. Its wide field view 2 steradians and duty cycle $>95$% are unique features compared other observatories that allow us observe every source transits over HAWC for up $\sim6$ hours each sidereal day. This regular sampling yields unprecedented light curves unbiased measurements independent seasons or weather conditions....
The High Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view detector sensitive to gamma rays of 100 GeV few hundred TeV. Located in central Mexico at 19\ifmmode^\circ\else\textdegree\fi{} North latitude and 4100 m above sea level, HAWC will observe cosmic with an array water detectors. full scheduled be operational Spring 2015. In this paper, we study the sensitivity gamma-ray signatures high-mass (multi-TeV) dark matter annihilation. diverse searches for annihilation,...
The first limits on the prompt emission from long gamma-ray burst (GRB) 130427A in $>100\nobreakspace\rm{GeV}$ energy band are reported. GRB was most powerful ever detected with a redshift $z\lesssim0.5$ and featured longest lasting above $100\nobreakspace\rm{MeV}$. spectrum extends at least up to $95\nobreakspace\rm{GeV}$, clearly range observable by High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory, new extensive air shower detector currently under construction central Mexico....
We present a search of very high energy gamma-ray emission from the Northern $\textit{Fermi}$ Bubble region using data collected with High Altitude Water Cherenkov (HAWC) observatory. The size set is 290 days. No significant excess observed in region, hence upper limits above $1\,\text{TeV}$ are calculated. between $3\times 10^{-7}\,\text{GeV}\, \text{cm}^{-2}\, \text{s}^{-1}\,\text{sr}^{-1}$ and $4\times 10^{-8}\,\text{GeV}\,\text{cm}^{-2}\,\text{s}^{-1}\,\text{sr}^{-1}$. disfavor proton...
A survey of the inner Galaxy region Galactic longitude l in [+15, +50] degree and latitude b [-4,+4] is performed using one-third High Altitude Water Cherenkov (HAWC) Observatory operated during its construction phase. To address ambiguities arising from unresolved sources data, we use a maximum likelihood technique to identify point source candidates. Ten candidate are identified this analysis. Eight these associated with known TeV but not all have differential fluxes compatible previous...
In this paper a new supernova catalogue containing data for 5526 extragalactic supernovae that were discovered up to 2010 December 31 is presented. It combines several catalogues are currently available online in consistent and traceable way. During the comparison of inconsistent entries identified resolved where possible. Remaining inconsistencies marked transparently can be easily identified. Thus it possible select high-quality sample most simple Where available, redshift-based distance...
The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory is an extensive air shower detector operating in central Mexico, which has recently completed its first two years of full operations. If for a burst like GRB 130427A at redshift 0.34 and high-energy component following power law with index -1.66, the extended to higher energies no cut-off other than from extragalactic background light attenuation, HAWC would observe gamma rays peak energy $\sim$300 GeV. This paper reports results...
Abstract We present the development of a real-time flare monitor for High Altitude Water Cherenkov (HAWC) observatory. The has been fully operational since 2017 January and is designed to detect very high energy (VHE; E ≳ 100 GeV) transient events from blazars on timescales lasting 2 minutes 10 hr in order facilitate multiwavelength multimessenger studies. These flares provide information investigations into mechanisms that power blazars’ relativistic jets accelerate particles within them,...
The Andromeda Galaxy (M31) is a nearby (∼780 kpc) galaxy similar to our own Milky Way. Observational evidence suggests that it resides in large halo of dark matter (DM), making good target for DM searches. We present search gamma rays from M31 using 1017 days data the High Altitude Water Cherenkov (HAWC) Observatory. With its wide field view and constant monitoring, HAWC well-suited extended targets like M31. No annihilation or decay signal was detected masses 1 100 TeV b, t, τ+τ−, μ+μ−,...
The open-source Multi-Mission Maximum likelihood (3ML) Framework allows for the common analysis of diverse datasets. ability to consistently fit and characterize astronomical data across many decades in energy is key understanding origin emission we measure with different instruments. 3ML uses plugins encapsulate interfaces instrument response functions. user can then define a model one or multiple sources describe given region interest. determine locations, spatial shapes, spectra model....
The High-Altitude Water Cherenkov Gamma Ray Observatory (HAWC) is under construction 4100 meters above sea level at Sierra Negra, Mexico. We describe the design and cabling of detector, characterization photomultipliers, timing calibration system. also outline a next-generation detector based on water technique.
List of proceedings from the HAWC Collaboration presented at 36th International Cosmic Ray Conference, 24 July - 1 August 2019, Madison, Wisconsin, USA.
The Galactic gamma-ray diffuse emission is produced by the interaction of cosmic rays with ambient gas and electromagnetic radiation fields in interstellar medium (ISM). Studying this helps reconstruct particle transport mechanisms distribution Galaxy. In work, we analyze TeV a chosen region plane using data collected High Altitude Water Cherenkov (HAWC) detector. energy spatial distributions have been studied after subtracting extended point sources detected greater than 5 sigma...
Current knowledge of the relative abundances and energy spectra elemental mass groups cosmic rays in $10$ TeV - $1$ PeV interval is uncertain. This situation prevents carrying out precision tests that may lead to distinguish among existing hypotheses on origin propagation galaxy. In order learn more about composition these particles, we have employed HAWC data from hadron induced air showers determine three rays: protons, helium heavy nuclei with $Z > 2$. The were estimated by using Gold...