Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session T10: Gamma Ray Astronomy: SurveysLive
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Sponsoring Units: DAP Chair: Miguel Mostafa, PSU |
Monday, April 19, 2021 3:45PM - 3:57PM Live |
T10.00001: AMEGO-X and the Extreme Multimessenger Universe Marco Ajello, Regina Caputo, Jeremy Perkins, Judith Racusin, Carolyn Kierans The All sky Medium Energy Gamma-ray Observatory~eXplorer (AMEGO-X) is an explorer class mission that will provide ground breaking new capabilities for multi-messenger astrophysics - identifying and studying the astrophysical objects that produce gravitational waves and neutrinos; along with a rich menu of additional science in astrophysical jets,~compact objects, and dark matter. AMEGO-X will cover the energy range from 200 keV to over 1 GeV, emphasizing continuum studies with more an order of magnitude improvement in sensitivity relative to previous missions. AMEGO-X will provide outstanding capability in time domain and multi-messenger astrophysics with excellent synergies with observations at other wavelengths. [Preview Abstract] |
Monday, April 19, 2021 3:57PM - 4:09PM Live |
T10.00002: Advancing Particle Astrophysics with the Southern Wide-field Gamma-ray Observatory (SWGO) Kristi Engel, Chad Brisbois, Petra Huentemeyer We present the Southern Wide-field Gamma-ray Observatory (SWGO): a next-generation, wide-field-of-view, ground-based survey instrument that will provide a unique view on gamma-ray emission from 100 GeV to hundreds of TeV. This facility will improve upon the success of other wide-field instruments that survey the Northern gamma-ray sky with a nearly 100\% duty cycle, like the HAWC Observatory in Mexico, and complement observations of the LHAASO observatory in China. The SWGO five-year differential point-source sensitivity is anticipated to be the best in the Southern sky above tens of TeV, with particular strengths towards observing extended sources and monitoring transient behavior across the sky. Its science topics include unveiling Galactic and extragalactic particle accelerators and monitoring the transient sky at very high energies. [Preview Abstract] |
Monday, April 19, 2021 4:09PM - 4:21PM Live |
T10.00003: Five years of gamma-ray observation with CALET Yuta Kawakubo The CALorimetric Electron Telescope (CALET) is a payload on the International Space Station (ISS). CALET has been observing cosmic rays and gamma-rays since October 2015. The Calorimeter (CAL), the primary instrument of CALET to observe cosmic rays and gamma-rays directly in space, has collected gamma-ray data for more than five years, and bright gamma-ray sources can be seen in CAL data. The CALET Gamma-ray Burst Monitor (CGBM), a secondary instrument for gamma-ray bursts (GRB) observation, has detected more than 230 GRBs in five years of observation. In this work, we present CALET results of gamma-ray observations, including GRB observations, from five years of operation. [Preview Abstract] |
Monday, April 19, 2021 4:21PM - 4:33PM Live |
T10.00004: Time-dependent Search for Spatially Coincident TeV Gamma-ray and Neutrino Emission with HAWC and IceCube Alison Peisker, Mehr Nisa Emission of both neutrinos and gamma rays from the same source indicates a hadronic production mechanism. Here we describe a time-dependent search for gamma-ray emission from HAWC spatially correlated with neutrino emission from IceCube's alerts. The IceCube Neutrino Observatory, a neutrino detector located at the South Pole, detects a flux of high-energy astrophysical neutrinos of unknown origin. IceCube issues alerts to the multi-messenger community when it detects neutrinos likely to be of astrophysical origin. The High Altitude Water Cherenkov (HAWC) Observatory is a gamma-ray detector located in Puebla, Mexico. With a wide instantaneous field of view and a high duty cycle, it is well-suited to perform a search for transient sources. We present recent results from this search using four years of HAWC data looking at locations from ten years of IceCube alerts. [Preview Abstract] |
Monday, April 19, 2021 4:33PM - 4:45PM Live |
T10.00005: A morphology-independent search for extended TeV gamma-ray sources Ruo Yu Shang, Vladimir Vassiliev We present a new background estimation method for a search for largely extended TeV gamma-ray sources with instruments of the imaging atmospheric Cherenkov technique. Gamma-ray and background cosmic ray air shower events are characterized by two shape parameters, mean-scaled length and width, and the distribution of which is represented by a matrix (the mean-scaled length parameter is column-indexed and the mean-scaled width parameter is row-indexed). The signal region of the matrix defined by the shape parameters is blinded, and the background method utilizes the unblinded entries of the matrix to recover the background distribution in the blinded signal-region entries. This new method is demonstrated using the examples of signal-free VERITAS (Very Energetic Radiation Imaging Telescope Array System) data. This report includes comparisons with conventional background methods. The systematic uncertainty and the sensitivity of the new method are also provided. This new method is designed for largely extended gamma-ray sources whose angular sizes could be larger than the field of view of the instruments. [Preview Abstract] |
Monday, April 19, 2021 4:45PM - 4:57PM Live |
T10.00006: Investigating Unassociated HAWC Sources in the Region l=52-62 Degrees Nicole Firestone, Miguel Mostafa The High Altitude Water Cherenkov Gamma-Ray Observatory (HAWC) is a very high energy (VHE; $>$ 100 GeV) gamma-ray detector with a large field of view and high duty cycle ($>$ 95\%). In 2017, the HAWC Collaboration presented the 2HWC catalog from 508 days of data collection, which included 16 candidate sources farther than 1 degree from any previously identified TeV source. We examined these candidate sources over time and updated their locations and extensions. Now, with a data collection period nearly triple in duration (1523 days), we compare our findings to that of the newly released 3HWC catalog. We analyze the morphology and energy spectra of 3HWC J1928+178, 3HWC J1940+237, and 3HWC J1950+242 in more detail and investigate their potential association with nearby sources. [Preview Abstract] |
Monday, April 19, 2021 4:57PM - 5:09PM Live |
T10.00007: Investigating Unassociated HAWC Sources in the Region l=60-72 degrees Sarah Greberman, Miguel Mostafa The High Altitude Water Cherenkov Gamma-Ray Observatory (HAWC) is a very high energy (VHE; $>$ 100 GeV) gamma-ray detector with a large field of view and high duty cycle ($>$ 95\%). In 2017, the HAWC Collaboration presented the 2HWC catalog from 508 days of data collection, which included 16 candidate sources farther than 1$^\circ$ from any previously identified TeV source. We examined these candidate sources over time and updated their locations and extensions. Now, with a data collection period nearly triple in duration (1523 days), we compare our findings to that of the newly released 3HWC catalog. We analyze the morphology and energy spectra of 3HWC J1950+242, 3HWC J1954+286, and 3HWC J2006+340 in more detail and investigate their potential association with nearby sources. [Preview Abstract] |
Monday, April 19, 2021 5:09PM - 5:21PM Live |
T10.00008: Follow-up Analysis of Geminga's Contribution to the Local Positron Excess with the HAWC Gamma-ray Observatory Ramiro Torres Escobedo The PAMELA, Fermi-LAT, and AMS-02 experiments measured a local positron excess above energies of 10 GeV. The reason for this excess is not well understood but has been considered to be due to dark matter particle mechanisms or the presence of nearby astrophysical sources. I present preliminary results for the follow-up study of the Geminga pulsar's possible contribution to this positron excess with 1343 days of HAWC data. In this study, I implement a spatial template interpolation method using 3D templates that contain spectral and spatial information of gamma-ray emission coming from electrons diffusing away from the pulsar for energies in the range of 100 GeV - 100 TeV. This model can further incorporate the proper motion of the pulsar and anisotropic diffusion of electrons/positrons. Using this model, I study the gamma-ray emission for electrons/positrons diffusing with coefficients of $10^{25}$- $10^{28}$ cm$^{2}$/s at 1 GeV and spectral indexes of 1.5 - 2.4. [Preview Abstract] |
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