AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
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Multimessenger observations and one-zone leptohadronic modeling of PKS 1725+123 during a flare constrain its emission to external Compton gamma-rays, SSC X-rays, and a neutrino rate of about 0.3 events per year peaking at 1 PeV.
Chandra observations of CTA 1 PWN show jet/torus morphology, constrain pulsar velocity to ≲200 km/s, and model low magnetic field with PeV electron cutoff in a young low-efficiency nebula.
Discovery of extended GeV gamma-ray emission from AFGL 490, with the protostellar jet identified as the likely particle accelerator rather than stellar winds.
X-ray spectral modeling and timing analysis of V1674 Her constrain its white dwarf mass to 1.09-1.12 solar masses, well below the near-Chandrasekhar value expected from its t2~1 day decline time.
Refined Fermi-LAT analysis finds the Galactic Center Excess has a centrally concentrated spherical morphology consistent with generalized Navarro-Frenk-White inner slope ~1.15, significant across interstellar emission models, with spectrum peaking at a few GeV and upper limits above tens of GeV.
ConvLSTM trained self-supervised on simulated daily all-sky maps detects transients in Fermi-LAT data via pixel-wise residual anomalies with spatial filtering.
Fermi LAT data analysis detects a time-evolving ~162-day periodic GeV signal from 4FGL J1913.2+0512 linked to SS 433, prominent in 2008-2018 but diminished afterward, indicating multi-year evolution in gamma-ray production efficiency or geometry.
Fermi-LAT and CO data support a hadronic PeVatron scenario for LHAASO J1912+1014u with proton index ~2.2 and total energy (1-5) x 10^49 erg above 1 GeV.
Hadronic proton-proton interactions in a superdiffusive one-zone model with proton luminosity 0.14 of spin-down power and diffusion index 1.05 reproduce the 7-200 TeV gamma-ray spectrum from PSR J0622+3749 halo at ambient density 1 cm^{-3}.
Seyfert galaxies produce observed TeV neutrinos via proton-proton collisions in outflow-cloud bow shocks and can account for a substantial fraction of the diffuse astrophysical neutrino background at 10^4-10^5 GeV.
Filtering unidentified Fermi sources and comparing to repopulated VL-II simulations yields upper limits of 4e-26 cm3/s (10 GeV) and 5e-25 cm3/s (100 GeV) on tau-pair annihilation.
Observational VLBI study of parsec-scale jets in 15 gamma-ray radio galaxies finds core flux density correlates with gamma-ray flux but gamma-ray luminosity shows no dependence on brightness temperature or core dominance.
Multi-instrument observations reveal broad overlap in X-ray photon indices across blazar subclasses with intra-source spectral evolution supporting transition-like behavior.
Reanalysis of Fermi-LAT observations indicates that gamma-ray emission from NGC 2403 and NGC 3424 originates from supernova ejecta and an obscured AGN, respectively, rather than star formation activity.
Multi-technique timing analysis indicates a ~478-day QPO in the gamma-ray emission of BL Lac GB6 J1037+5711.
PKS 0346-27 displayed a prolonged 2018 gamma-ray high state with ~1.5-hour variability, harder spectrum, and SED transition from LSP to ISP class, with one-zone leptonic modeling indicating lower magnetic field, larger radius, and higher electron energies than in quiescence.
Analysis of an unidentified Fermi gamma-ray source shows inconclusive results with a mild spectral preference for dark matter annihilation over a pulsar origin.
Jet power estimates for FSRQs PKS 1441+25 and Ton 599 are insensitive to the choice of electron energy distribution model because of lower break energies and external Compton dominance.
The FL16Y catalog provides 7220 gamma-ray sources with improved localizations from 16 years of Fermi-LAT data while retaining the prior diffuse emission model.
citing papers explorer
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AGILE detection of transient {\gamma}-ray emission from the region of the supergiant fast X-ray transient source IGR J17354-3255
AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
-
Zooming in on the GeV $\gamma$-ray flare of the blazar PKS 1725+123 with a multimessenger lens
Multimessenger observations and one-zone leptohadronic modeling of PKS 1725+123 during a flare constrain its emission to external Compton gamma-rays, SSC X-rays, and a neutrino rate of about 0.3 events per year peaking at 1 PeV.
-
Chandra X-ray Observations of the Pulsar Wind Nebula within CTA 1
Chandra observations of CTA 1 PWN show jet/torus morphology, constrain pulsar velocity to ≲200 km/s, and model low magnetic field with PeV electron cutoff in a young low-efficiency nebula.
-
GeV {\gamma}-ray emission in the low-mass star-forming region AFGL 490
Discovery of extended GeV gamma-ray emission from AFGL 490, with the protostellar jet identified as the likely particle accelerator rather than stellar winds.
-
X-ray spectroscopy mass constraints on V1674 Her: the fastest nova does not have a near-Chandrasekhar white dwarf
X-ray spectral modeling and timing analysis of V1674 Her constrain its white dwarf mass to 1.09-1.12 solar masses, well below the near-Chandrasekhar value expected from its t2~1 day decline time.
-
A Precise Measurement of the Fermi-LAT Galactic Center Excess Morphology and Spectrum
Refined Fermi-LAT analysis finds the Galactic Center Excess has a centrally concentrated spherical morphology consistent with generalized Navarro-Frenk-White inner slope ~1.15, significant across interstellar emission models, with spectrum peaking at a few GeV and upper limits above tens of GeV.
-
Self-Supervised ConvLSTM for Fermi Large Area Telescope Transient Detection
ConvLSTM trained self-supervised on simulated daily all-sky maps detects transients in Fermi-LAT data via pixel-wise residual anomalies with spatial filtering.
-
Temporal evolution of the periodic GeV signal from 4FGL J1913.2+0512 and analysis of the SS 433 / W50 lobes
Fermi LAT data analysis detects a time-evolving ~162-day periodic GeV signal from 4FGL J1913.2+0512 linked to SS 433, prominent in 2008-2018 but diminished afterward, indicating multi-year evolution in gamma-ray production efficiency or geometry.
-
Hadronic Scenario for Galactic PeVatron LHAASO J1912+1014u Supported by Fermi-LAT $\gamma$-ray Data and FUGIN CO Data
Fermi-LAT and CO data support a hadronic PeVatron scenario for LHAASO J1912+1014u with proton index ~2.2 and total energy (1-5) x 10^49 erg above 1 GeV.
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Hadronic Origin of Sub-PeV Gamma-Ray Emission from LHAASO J0621+3755
Hadronic proton-proton interactions in a superdiffusive one-zone model with proton luminosity 0.14 of spin-down power and diffusion index 1.05 reproduce the 7-200 TeV gamma-ray spectrum from PSR J0622+3749 halo at ambient density 1 cm^{-3}.
-
Seyfert Galaxies as Neutrino Sources: An Outflow$-$Cloud Interaction Perspective
Seyfert galaxies produce observed TeV neutrinos via proton-proton collisions in outflow-cloud bow shocks and can account for a substantial fraction of the diffuse astrophysical neutrino background at 10^4-10^5 GeV.
-
Unidentified Gamma-ray Sources as Targets for Indirect Dark Matter Detection with the Fermi-Large Area Telescope
Filtering unidentified Fermi sources and comparing to repopulated VL-II simulations yields upper limits of 4e-26 cm3/s (10 GeV) and 5e-25 cm3/s (100 GeV) on tau-pair annihilation.
-
Gamma-ray emission in radio galaxies under the VLBI scope -- I. Parsec-scale kinematics and high-energy properties of $\gamma$-ray detected TANAMI radio galaxies
Observational VLBI study of parsec-scale jets in 15 gamma-ray radio galaxies finds core flux density correlates with gamma-ray flux but gamma-ray luminosity shows no dependence on brightness temperature or core dominance.
-
Spectral-Regime Overlap and Transition-like Behavior in the Blazar Population from Multi-Instrument X-ray and TeV Observations
Multi-instrument observations reveal broad overlap in X-ray photon indices across blazar subclasses with intra-source spectral evolution supporting transition-like behavior.
-
Probing the $\gamma$-ray Emission Origin of Two Star-forming Galaxies NGC 2403 and NGC 3424 with the Fermi-LAT
Reanalysis of Fermi-LAT observations indicates that gamma-ray emission from NGC 2403 and NGC 3424 originates from supernova ejecta and an obscured AGN, respectively, rather than star formation activity.
-
Indication of gamma-Ray Quasi-periodicity in GB6 J1037+5711 from Multi-technique Timing Analysis
Multi-technique timing analysis indicates a ~478-day QPO in the gamma-ray emission of BL Lac GB6 J1037+5711.
-
The large gamma-ray flare of the FSRQ PKS 0346-27
PKS 0346-27 displayed a prolonged 2018 gamma-ray high state with ~1.5-hour variability, harder spectrum, and SED transition from LSP to ISP class, with one-zone leptonic modeling indicating lower magnetic field, larger radius, and higher electron energies than in quiescence.
-
Deeper analysis of Fermi-LAT unassociated 4FGL J2112.5-3043 for possible identification
Analysis of an unidentified Fermi gamma-ray source shows inconclusive results with a mild spectral preference for dark matter annihilation over a pulsar origin.
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Jet Power Estimates of FSRQs PKS 1441+25 and Ton 599 from Broadband SED Modeling
Jet power estimates for FSRQs PKS 1441+25 and Ton 599 are insensitive to the choice of electron energy distribution model because of lower break energies and external Compton dominance.
-
Fermi-LAT 16-year Source List
The FL16Y catalog provides 7220 gamma-ray sources with improved localizations from 16 years of Fermi-LAT data while retaining the prior diffuse emission model.