Explanipedia

Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT Open

A. Acharyya, Alessandro Adelfio, M. Ajello, L. Baldini, C. Bartolini , et al. · 2025

The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge…

A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars Open

A. Acharyya, Alessandro Adelfio, M. Ajello, L. Baldini, J. Ballet , et al. · 2025

An increasing number of pulsar wind nebulae (PWNe) are being identified in the TeV band by ground-based Imaging Air Cherenkov Telescopes such that they constitute the dominant source class of Galactic TeV emitters. However, MeV–GeV PWN cou…

Nonthermal emission in the central starburst region of M82 Open

M. Persic, R. Rando, Y. Rephaeli · 2025

Context. Diffuse nonthermal (NT) emission from the central starburst (CSB) region of M82 has been measured at radio, X-ray, and γ -ray energies. Far-infrared (FIR), radio, and X-ray emission maps are mutually consistent, with the radio and…

Fermi detection of gamma-ray emission from the hot coronae of radio-quiet active galactic nuclei Open

Junrong Liu, Jian‐Min Wang, Soheila Abdollahi, M. Ajello, Rafael Alves Batista , et al. · 2025

GRB 221009A: The B.O.A.T. Burst that Shines in Gamma Rays Open

M Axelsson, M Ajello, M. Arimoto, L Baldini, J. Ballet , et al. · 2025

We present a complete analysis of Fermi Large Area Telescope (LAT) data of GRB 221009A, the brightest gamma-ray burst (GRB) ever detected. The burst emission above 30 MeV detected by the LAT preceded, by 1 s, the low-energy (<10 MeV) pulse…

Fermi detection of gamma-ray Emission from the Hot Coronae of Radio-quiet Active Galactic Nuclei Open

S. Abdollahi, M Ajello, Rafael Alves Batista, L Baldini, C. Bartolini , et al. · 2025

Relativistic jets around supermassive black holes (SMBHs) are well-known powerful $γ$-ray emitters. In absence of the jets in radio-quiet active galactic nuclei (AGNs), how the SMBHs work in $γ$-ray bands is still unknown despite of great …

Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations Open

S. Abdollahi, L. Baldini, G. Barbiellini, R. Bellazzini, B. Berenji , et al. · 2024

A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the tot…

Search for Extended GeV Sources in the Inner Galactic Plane Open

S. Abdollahi, F. Acero, Amit Acharyya, Alessandro Adelfio, M. Ajello , et al. · 2024

The recent detection of extended $γ$-ray emission around middle-aged pulsars is interpreted as inverse-Compton scattering of ambient photons by electron-positron pairs escaping the pulsar wind nebula, which are confined near the system by …

Non-thermal emission in M31 and M33 Open

M. Persic, Yoel Rephaeli, R. Rando · 2024

Spiral galaxies M31 and M33 are Fermi/LAT-detected gamma-ray sources. We model the broadband non-thermal (NT) emission of the central region of M31 (R < 5.5 kpc) and of the disk of M33 (R ~ 9 kpc). For either galaxy, we self-consistently m…

Non-thermal emission in M31 and M33 Open

M. Persic, Yoel Rephaeli, R. Rando · 2024

Context. Spiral galaxies M31 and M33 are among the γ -ray sources detected by the Fermi Large Area Telescope (LAT). Aims. We aim to model the broadband non-thermal emission of the central region of M31 (a LAT point source) and of the disk …

Prospects of additional contribution at optical-NIR band of EBL in the light of VHE spectra Open

N. Mankuzhiyil, M. Persic, A. Franceschini · 2023

The extragalactic background light (EBL) that spans the ultraviolet-infrared (UV-IR) band originates from direct and dust-reprocessed starlight integrated over the history of the Universe. EBL measurements are very challenging due to foreg…

The Fermi-LAT Lightcurve Repository* Open

S. Abdollahi, M. Ajello, L. Baldini, J. Ballet, D. Bastieri , et al. · 2023

The Fermi Large Area Telescope (LAT) lightcurve repository (LCR) is a publicly available, continually updated library of gamma-ray lightcurves of variable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT LCR aims to prov…

Diffuse non-thermal emission in the disks of the Magellanic Clouds <i>(Corrigendum)</i> Open

M. Persic, Yoel Rephaeli · 2023

Context.The Magellanic Clouds, two dwarf galaxy companions to the Milky Way, are among the Fermi Large Area Telescope (LAT) brightest γ-ray sources.Aims.Comprehensive modeling of the non-thermal electromagnetic and neutrino emission in bot…

The Fermi-LAT Light Curve Repository Open

Soheila Abdollahi, M. Ajello, L. Baldini, J. Ballet, D. Bastieri , et al. · 2023

The Fermi Large Area Telescope (LAT) light curve repository (LCR) is a\npublicly available, continually updated library of gamma-ray light curves of\nvariable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT\nLCR aims to…

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3 Open

M. Ajello, L. Baldini, J. Ballet, D. Bastieri, J. Becerra González , et al. · 2022

An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 yr of E > 50…

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3 Open

The Fermi-LAT collaboration, NULL AUTHOR_ID, M. Ajello, L. Baldini, J. Ballet , et al. · 2022

An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 years of E>5…

Diffuse non-thermal emission in the disks of the Magellanic Clouds Open

M. Persic, Yoel Rephaeli · 2022

Context. The Magellanic Clouds, two dwarf galaxy companions to the Milky Way, are among the Fermi Large Area Telescope (LAT) brightest γ-ray sources. Aims. We present comprehensive modeling of the non-thermal electromagnetic and neutrino e…

Diffuse non-thermal emission in the disks of the Magellanic Clouds Open

M. Persic, Yoel Rephaeli · 2022

The Magellanic Clouds, two dwarf galaxy companions to the Milky Way, are among the Fermi Large Area Telescope (LAT) brightest gamma-ray sources. Aiming at a comprehensive modeling of the non-thermal electromagnetic and neutrino emission in…

Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources Open

S. Abdollahi, F. Acero, M. Ackermann, L. Baldini, J. Ballet , et al. · 2022

Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma-rays. This offers a compelling way to identify th…

A gamma-ray pulsar timing array constrains the nanohertz gravitational wave background Open

M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini , et al. · 2022

After large galaxies merge, their central supermassive black holes are expected to form binary systems. Their orbital motion should generate a gravitational wave background (GWB) at nanohertz frequencies. Searches for this background use p…

IGR J18249-3243: a new GeV-emitting FR II and the emerging population of\n high energy radio galaxies Open

G. Bruni, L. Bassani, M. Persic, Yoel Rephaeli, A. Malizia , et al. · 2022

The advent of new all-sky radio surveys such as the VLA Sky Survey (VLASS)\nand the Rapid ASKAP Continuum Survey (RACS), performed with the latest\ngeneration radio telescopes, is opening new possibilities on the classification\nand study …

arXiv : Combined searches for dark matter in dwarf spheroidal galaxies observed with the MAGIC telescopes, including new data from Coma Berenices and Draco Open

V. A. Acciari, C. Bigongiari, M. Teshima, D. Dorner, N. Sahakyan , et al. · 2021

Milky Way dwarf spheroidal galaxies (dSphs) are among the best candidates to search for signals of dark matter annihilation with Imaging Atmospheric Cherenkov Telescopes, given their high mass-to-light ratios and the fact that they are fre…

Gamma Rays from Fast Black-hole Winds Open

M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri , et al. · 2021

Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, can unbind the gas from the stellar bulges of galaxies. These winds may be responsible for the observed scaling relation betw…

Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data Open

L. Baldini, J. Ballet, D. Bastieri, J. Becerra González, R. Bellazzini , et al. · 2021

We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ -ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly ti…

The First Fermi-LAT Solar Flare Catalog Appendix Open

M. Ajello, L. Baldini, D. Bastieri, R. Bellazzini, A. Berretta , et al. · 2020

We present the appendix of the First Fermi-Large Area Telescope (LAT) Solar flare catalog covering the 24thSolar cycle. The catalog (published in ApJS) contains 45 Fermi-LAT Solar flares (FLSFs) with emission in theγ-ray energy band (30 Me…

The First Fermi-LAT Solar Flare Catalog Appendix Open

M. Ajello, L. Baldini, D. Bastieri, R. Bellazzini, A. Berretta , et al. · 2020

We present the appendix of the First Fermi-Large Area Telescope (LAT) Solar flare catalog covering the 24thSolar cycle. The catalog (published in ApJS) contains 45 Fermi-LAT Solar flares (FLSFs) with emission in theγ-ray energy band (30 Me…

The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope Open

M. Ajello, R. Angioni, M. Axelsson, J. Ballet, G. Barbiellini , et al. · 2020

The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains objects located at high Galactic latitudes ( ). It includes 85…

MAGIC upper limits for two Milagro-detected bright Fermi sources in the region of SNR G65.1+0.6 Open

J. Aleksić, L. A. Antonelli, P. Antoranz, Michael Backes, J. A. Barrio , et al. · 2020

We report on the observation of the region around supernova remnant G65.1+0.6 with the stand-alone MAGIC-I telescope. This region hosts the two bright GeV gamma-ray sources 1FGL J1954.3+2836 and 1FGL J1958.6+2845. They are identified as Ge…

Non-thermal emission in the lobes of radio galaxies. Open

M. Persic · 2020

Radio and gamma-ray measurements of radiogalaxy lobes are useful to determine whether emission in these widely separated spectral regions is mainly by non-thermal (NT) electrons. This is of interest as there is yet no proof for a significa…

Non-thermal emission in lobes of radio galaxies – III. 3C 98, Pictor A, DA 240, Cygnus A, 3C 326, and 3C 236 Open

M. Persic, Yoel Rephaeli · 2019

Recent analyses of the broad spectral energy distributions (SEDs) of extensive lobes of local radio galaxies have confirmed the leptonic origin of their Fermi/Large Area Telescope γ-ray emission, significantly constraining the level of had…

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