สืบค้นงานวิจัย
The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis
Abdollahi S. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis
ผู้แต่ง / หัวหน้าโครงการ (EN): Abdollahi S.
บทคัดย่อ (EN): We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the entire sky observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. With respect to the first FAVA catalog, this catalog benefits from a larger data set, the latest LAT data release (Pass 8), as well as from an improved analysis that includes likelihood techniques for a more precise localization of the transients. Applying this analysis to the first 7.4 years of Fermi observations, and in two separate energy bands 0.1-0.8 GeV and 0.8-300 GeV, a total of 4547 flares were detected with significance greater than 6σ(before trials), on the timescale of one week. Through spatial clustering of these flares, 518 variable gamma-ray sources were identified. Based on positional coincidence, likely counterparts have been found for 441 sources, mostly among the blazar class of active galactic nuclei. For 77 2FAV sources, no likely gamma-ray counterpart has been found. For each source in the catalog, we provide the time, location, and spectrum of each flaring episode. Studying the spectra of the flares, we observe a harder-when-brighter behavior for flares associated with blazars, with the exception of BL Lac flares detected in the low-energy band. The photon indexes of the flares are never significantly smaller than 1.5. For a leptonic model, and under the assumption of isotropy, this limit suggests that the spectrum of freshly accelerated electrons is never harder than P ∼ 2. © 2017. The American Astronomical Society. All rights reserved.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-85029106472&doi=10.3847%2f1538-4357%2faa8092&partnerID=40&md5=d1fc62b989a621e533cdde9b31cf8ac3
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): techniques: photometric
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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Abdollahi S.. "The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis". ไม่ระบุหน่วยงาน. ม.ป.ป.

Abdollahi S.. "The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis
Abdollahi S.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog 3FHL: The Third Catalog of Hard Fermi-LAT Sources SEARCH for GAMMA-RAY EMISSION from the COMA CLUSTER with SIX YEARS of FERMI-LAT DATA Search for Gamma-Ray Emission from Local Primordial Black Holes with the Fermi Large Area Telescope Fermi large area telescope detection of extended gamma-ray emission from the radio galaxy Fornax A THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG Low Protein Natural Rubber Processed Through Gamma Ray Irradiation Technology The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV Effect of gamma ray on morphological characteristic of Nelumbo nucifera (Roseum Plenum lotus) FERMI-LAT OBSERVATIONS of HIGH-ENERGY γ-RAY EMISSION TOWARD the GALACTIC CENTER
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