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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Fermi-LAT data shows gamma-ray emission from low-luminosity AGN with the subthreshold population signal consistent with star-formation dominance and individually detected sources likely powered by jets via synchrotron self-Compton emission under weakly magnetized particle-dominated conditions.
Changing-look blazars occupy intermediate regions in gamma-ray and X-ray parameter spaces but lie statistically closer to flat-spectrum radio quasars than to BL Lac objects according to centroids, PCA, UMAP, and random-forest classification.
Wolf-Rayet star clusters show a marginal spatial correlation with unidentified GeV gamma-ray sources, with 11 new cluster associations and 4 isolated WR stars identified as potential emitters from wind termination shocks.
2MASX J0413-0050 transitioned from a narrow-line Seyfert 1 to a Seyfert 1.9 and back while remaining in a high accretion state, supporting classification as a changing-state AGN.
A census of ~3600 variable compact radio sources at 3 GHz from VLASS epochs 1 and 2, with 5-9% showing >30% flux changes above 20-300 mJy and most consistent with blazars or quasars.
Reports ~20% projected polarization in synchrotron and thermal dust emission from Fermi bubbles, with fields parallel to edges, and attributes larger lobes to an older supermassive black hole outburst.
3D RHD simulations of FR0 jets in LEDA 55267 and LEDA 58287 show recollimation shocks driving compactness via turbulence and deceleration, with SED modeling predicting lepto-hadronic emission at TeV energies as a testable forecast.
Diffuse gamma-ray emission detected toward Berkeley 87 with 0.36° extension and photon index 2.68, favoring a hadronic origin due to dense gas and stellar winds.
First results from the SPOTS campaign reveal low average optical polarization (≲10%) and low magnetic field ordering (F_B ≲0.10) across 14 TeV blazars, with stochastic or rotating polarization angles and wavelength-dependent behavior indicating complex, turbulent jet structures.
Estimates based on 17 years of Fermi LAT data indicate COSI may detect MeV polarization in a small number of blazar flares, with flat-spectrum radio quasars as the top targets.
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.
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.
The 4FGL-DR4 catalog updates the prior release with 14 years of Fermi-LAT observations, adding 546 new point sources and revising parameters, associations, and light curves for a total of 7194 gamma-ray sources.
Recent high and ultrahigh energy neutrino detections open a new observational window to the universe by revealing sources and processes inaccessible via photons.
Reviews IceCube neutrino results, models Galactic plane flux from cosmic ray interactions with the interstellar medium, and discusses prospects for identifying PeVatrons via LHAASO sources.
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.
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Characterizing the Gamma-ray Emission from Low-Luminosity AGN
Fermi-LAT data shows gamma-ray emission from low-luminosity AGN with the subthreshold population signal consistent with star-formation dominance and individually detected sources likely powered by jets via synchrotron self-Compton emission under weakly magnetized particle-dominated conditions.
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Exploring the Transitional Parameter Space of Blazars using Gamma-ray and X-ray Population Diagnostics
Changing-look blazars occupy intermediate regions in gamma-ray and X-ray parameter spaces but lie statistically closer to flat-spectrum radio quasars than to BL Lac objects according to centroids, PCA, UMAP, and random-forest classification.
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Wolf-Rayet stars as tracers of gamma-ray emission: Isolated stars and stellar clusters/associations
Wolf-Rayet star clusters show a marginal spatial correlation with unidentified GeV gamma-ray sources, with 11 new cluster associations and 4 isolated WR stars identified as potential emitters from wind termination shocks.
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An X-ray and optical spectral study of the changing-look narrow-line Seyfert 1 2MASX J0413-0050
2MASX J0413-0050 transitioned from a narrow-line Seyfert 1 to a Seyfert 1.9 and back while remaining in a high accretion state, supporting classification as a changing-state AGN.
-
A Census of Variable Radio Sources at $3\,$GHz
A census of ~3600 variable compact radio sources at 3 GHz from VLASS epochs 1 and 2, with 5-9% showing >30% flux changes above 20-300 mJy and most consistent with blazars or quasars.
-
Detection of polarized Fermi-bubble synchrotron and dust emission
Reports ~20% projected polarization in synchrotron and thermal dust emission from Fermi bubbles, with fields parallel to edges, and attributes larger lobes to an older supermassive black hole outburst.
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FR0 radio galaxy jets -- I. linking jet dynamics and high-energy emission in LEDA 55267 and LEDA 58287
3D RHD simulations of FR0 jets in LEDA 55267 and LEDA 58287 show recollimation shocks driving compactness via turbulence and deceleration, with SED modeling predicting lepto-hadronic emission at TeV energies as a testable forecast.
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Diffuse gamma-ray emission in the vicinity of open cluster Berkeley 87
Diffuse gamma-ray emission detected toward Berkeley 87 with 0.36° extension and photon index 2.68, favoring a hadronic origin due to dense gas and stellar winds.
-
Spectro-Polarimetric Observations of TeV Sources (SPOTS): First results
First results from the SPOTS campaign reveal low average optical polarization (≲10%) and low magnetic field ordering (F_B ≲0.10) across 14 TeV blazars, with stochastic or rotating polarization angles and wavelength-dependent behavior indicating complex, turbulent jet structures.
-
Detectability of Polarized Gamma-ray Emission from Blazar Flares with COSI
Estimates based on 17 years of Fermi LAT data indicate COSI may detect MeV polarization in a small number of blazar flares, with flat-spectrum radio quasars as the top targets.
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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.
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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.
-
Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
The 4FGL-DR4 catalog updates the prior release with 14 years of Fermi-LAT observations, adding 546 new point sources and revising parameters, associations, and light curves for a total of 7194 gamma-ray sources.
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Particle Astrophysics with High and Ultrahigh Energy Neutrinos
Recent high and ultrahigh energy neutrino detections open a new observational window to the universe by revealing sources and processes inaccessible via photons.
-
IceCube Results and Perspective for Neutrinos from LHAASO Sources
Reviews IceCube neutrino results, models Galactic plane flux from cosmic ray interactions with the interstellar medium, and discusses prospects for identifying PeVatrons via LHAASO sources.
- The exceptional 2017 gamma-ray flare of the radio galaxy NGC 1275: VERITAS and Multiwavelength Observations