Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session N13: Gamma Ray Astronomy II |
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Sponsoring Units: DAP Chair: Rishi Babu, Michigan Technological University Room: Marquette IV - 2nd Floor |
Monday, April 17, 2023 1:30PM - 1:42PM |
N13.00001: Spectrum and Morphology Analysis of Source HAWC J2031+415 Ian Herzog The Cygnus Cocoon region is a complex region containing an OB star cluster that is prominent in the TeV energy range. Located in this region are two sources seen by the High-Altitude Water Cherenkov (HAWC) observatory: 3HWC J2031+415 and 3HWC J2020+403. 3HWC J2031+415 is a significant TeV gamma-ray source whose emission is a composition of 2 sources: HAWC J2030+409, associated with the Fermi-LAT Cocoon and HAWC J2031+415, a pulsar wind nebula possibly associate with PSR J2032+4127. 3HWC J2020+403 is composed of one source and is associated with the supernova remnant Gamma Cygni. Using a multi-source fitting algorithm, an investigation of the spectrum and energy morphology of HAWC J2031+415 is presented in this work. Additionally, X-ray observations from Suzaku are used to constrain the leptonic production of gamma rays by the PWN. |
Monday, April 17, 2023 1:42PM - 1:54PM |
N13.00002: The Hunt for TeV Extragalactic Sources with HAWC Kara Whitaker Using six years of data from the High Altitude Water Cherenkov (HAWC) observatory we search for very high energy emission to identify extragalactic sources above 1 TeV. Due to the attenuation of high energy particles as well as decreased flux at these energies, observing extragalactic sources above 1 TeV has historically been limited to only a few extremely bright sources. Using a published prescription to define a list of candidates from relatively nearby extragalactic radio-emitting X-ray sources in combination with HAWC's broad field of view and near constant data collection, we identify a likely TeV source candidate, 1ES1215+303. Using the most up to date event reconstruction algorithm with improved angular resolution we model and constrain the physical parameters of the source. |
Monday, April 17, 2023 1:54PM - 2:06PM |
N13.00003: Search for TeV emission from unassociated excesses in the 3HWC catalog Miguel A Mostafa, Hugo Ayala, Kenya Mitchell There are 65 significant detections in the third catalog of TeV gamma-ray sources from the High Altitude Water Cherenkov (HAWC) observatory (3HWC). Among many interesting objects, the 3HWC catalog contains twenty sources that are more than 1 degree away from any previously detected TeV source. These are called either orphan or unassociated TeV sources. With three more years of HAWC data than presented in the 3HWC catalog, we followed up on these twenty objects in time and also searched for lower energy correlations. We will present the candidate sources, their spectra, and the temporal evolution of the excess significance compared to the expectation for steady sources. |
Monday, April 17, 2023 2:06PM - 2:18PM Withdrawn |
N13.00004: Search for TeV emission from unbiased survey of high-frequency-peaked BL Lacs Pazit Rabinowitz More than 50 high frequency peaked BL Lacs (HBLs) have been detected by ground-based TeV gamma-ray observatories, making them the dominant population of extragalactic sources at TeV energies. Between 2019 and 2022, the VERITAS observatory has conducted a campaign to observe a flux-limited sample of 36 X-ray selected HBLs in order to produce the first unbiased survey of TeV emission from HBL blazars. The VERITAS HBL sample includes 21 known TeV sources as well as 15 blazars which do not yet have reported TeV emission. These observations have the goal to find unbiased estimates of the TeV flux of HBLs, which are generally only reported from their flaring states, and also to detect new TeV blazars which have not previously been observed. First results from this survey will be presented, as well as their implications for understanding the intrinsic properties of HBL sources. |
Monday, April 17, 2023 2:18PM - 2:30PM |
N13.00005: HAWC Analysis of HESS J1809-193: a potential hadronic PeVatron? Rishi Babu HESS J1809-193 is a TeV source rich region with multiple sources classes including pulsars and supernova remnants(SNRs). First observed by the High Energy Stereoscopic System(H.E.S.S.), the High Altitude Water Cherenkov (HAWC) observatory further extends the spectral measurement of the region to above 100 TeV. Marked as a potential PeVatron candidate, the ultimate goal is to understand the particle acceleration and evolution processes from this region and its source associations. Multi-wavelength spectral and morphological studies have been performed for the search for a hadronic origin. Here we will present the HAWC analysis for HESS J1809-193 along with potential sources for CRs associated with the observed high energy gamma rays |
Monday, April 17, 2023 2:30PM - 2:42PM |
N13.00006: A Preliminary Look at the Construction of the 4HWC Catalog Using a Multi-Source Fit Method Samuel Groetsch Over the lifetime of the High Altitude Water Cherenkov (HAWC) Observatory three Very High Energy (VHE) source catalogs have been produced. Growing from a preliminary catalog with only a handful of significant sources to the most recent 3HWC catalog with 65 VHE sources, each new catalog represents an improvement in our ability to resolve VHE sources. Here I will present on the planned 4HWC catalog which incorporates several major improvements over earlier catalog constructions. An additional 798 days of data between the creation of the 3HWC and 4HWC along with improved event reconstruction algorithms provides a much more sensitive data set to serve as a foundation for the catalog. Furthermore, a switch from the previously used method which relied upon searching for isolated maxima in the data maps and fitting a small number of predetermined fixed source models to a multi-source fit method which fits large regions of interest using several source morphologies and spectral models inspired by the Fermi extended MSF method should result in a much more comprehensive source list. I will present some preliminary results of the automated MSF method in several benchmark regions in HAWC data. |
Monday, April 17, 2023 2:42PM - 2:54PM |
N13.00007: Observation of the Crab Nebula and Galactic Center with the improved HAWC reconstruction algorithm Sohyoun L Yun Carcamo, Andrew J Smith Ground-based detectors indirectly observe gamma rays by detecting the secondary products of the Extensive Air Shower (EAS). The performance of such detectors is mainly shaped by the methodologies and algorithms employed when reconstructing events using only the footprint left on the ground. The High Altitude Water Cherenkov Gamma-ray Observatory (HAWC) has been operating since 2015 in Mexico. HAWC recently improved numerous stages of its reconstruction algorithm, from the initial noise suppression cleaning to the final gamma/hadron separation. Here, we go through the main changes in the reconstruction steps and verify the overall performance improvement by observing the Crab Nebula and the Galactic center. |
Monday, April 17, 2023 2:54PM - 3:06PM Withdrawn |
N13.00008: Detection of the V4641 Sgr in multi-TeV with HAWC Xiaojie Wang X-ray binaries have been recognized as one of the potential VHE gamma-ray emitters since the 1990s. The emission process varies across sources. Recently observations of X-ray binaries in the multi-TeV range have increased, renewing interest in this source class as cosmic-ray accelerators. With more data and better reconstruction algorithms, a new gamma-ray source spatially consistent with X-binary V4641 Sgr. has been detected in the newly released High Altitude Water Cherenkov (HAWC) Observatory data set. In this talk, I will present the preliminary analysis results of V4641 Sgr. and provide more insight into the acceleration mechanism of X-ray binaries. |
Monday, April 17, 2023 3:06PM - 3:18PM |
N13.00009: AstroPix: Monolithic Active Pixel detectors for space-based gamma-ray astronomy Henrike Fleischhack, Amanda Steinhebel, Regina M Caputo, Daniel Violette To further our understanding of non-thermal emission from the Universe, the gamma-ray astronomy community must close the "MeV gap" in sensitivity and design a mission with sensitive spectral and imaging capabilities in the energy range from tens of keV to hundreds of MeV. One concept that would deliver these capabilities is the proposed AMEGO-X mission.
We are currently designing AstroPix, a monolithic active silicon pixel sensor, for use in the tracker subsystem of AMEGO-X. With its low noise, integrated readout system, and fine spatial and energy resolution, AstroPix will provide precise measurements of gamma-ray interactions and secondary particles in the detector and enable AMEGO-X to detect and reconstruct gamma-ray photons over more than four decades in energy and interacting via three different mechanism (photoelectric effect, Compton scattering, and pair production). Current efforts aim at characterizing and optimizing AstroPix prototypes in the lab and at particle beams, leading up to a suborbital flight in 2024. In this presentation, I will give an overview of the AstroPix project, its goals, and status. |
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