1. The third Fermi Large Area Telescope catalog of gamma-ray pulsarsD. A. Smith, S. Abdollahi, M. Ajello, M. Bailes, L. Baldini, J. Ballet, M. G. Baring, C. Bassa, J. Becerra Gonzalez, R. Bellazzini, Gabrijela Zaharijas, 2023, izvirni znanstveni članek Ključne besede: gamma ray astrophysics, catalogues, pulsars
Objavljeno v RUNG: 15.01.2024; Ogledov: 1303; Prenosov: 7
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2. Mind the gap : the discrepancy between simulation and reality drives interpretations of the Galactic Center ExcessSascha Caron, Christopher Eckner, Luc Hendriks, Gudlaugur Johannesson, Roberto Ruiz de Austri, Gabrijela Zaharijas, 2023, izvirni znanstveni članek Ključne besede: gamma-ray astrophysics, dark matter, galactic center
Objavljeno v RUNG: 15.01.2024; Ogledov: 1574; Prenosov: 7
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3. The fourth catalog of active galactic nuclei detected by the Fermi Large Area Telescope : data release 3M. Ajello, L. Baldini, J. Ballet, D. Bastieri, J. Becerra Gonzalez, R. Bellazzini, A. Berretta, E. Bissaldi, R. Bonino, Gabrijela Zaharijas, 2022, izvirni znanstveni članek Ključne besede: gamma ray astrophysics, active galactic nucleai
Objavljeno v RUNG: 15.01.2024; Ogledov: 1370; Prenosov: 6
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4. The Cherenkov Telescope Array. Science Goals and Current StatusRene A. Ong, Christopher Eckner, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2019, objavljeni znanstveni prispevek na konferenci (vabljeno predavanje) Opis: The Cherenkov Telescope Array (CTA) is the major ground-based gamma-ray observatory planned for the next decade and beyond. Consisting of two large atmospheric Cherenkov telescope arrays (one in the southern hemisphere and one in the northern
hemisphere), CTA will have superior angular resolution, a much wider energy range, and
approximately an order of magnitude improvement in sensitivity, as compared to existing instruments. The CTA science programme will be rich and diverse, covering cosmic particle acceleration, the astrophysics of extreme environments, and physics frontiers beyond the Standard Model. This paper outlines the science goals for CTA and covers the current status of the project.
Ključne besede: very-high-energy gamma-ray astronomy, Cherenkov Telescope Array (CTA), cosmic particle acceleration, astrophysics of extreme environments, physics beyond the Standard Model
Objavljeno v RUNG: 11.10.2023; Ogledov: 1567; Prenosov: 10
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5. Low-luminosity jetted AGN as particle multi-messenger sourcesAnita Reimer, Margot Boughelilba, Lukas Merten, Paolo Da Vela, Jon Paul Lundquist, Serguei Vorobiov, 2023, objavljeni povzetek znanstvenega prispevka na konferenci Opis: The detection of cosmic gamma rays, high-energy neutrinos and cosmic rays (CRs) signal the existence of environments in the Universe that allow particle acceleration to extremely high energies. These observable signatures from putative CR sources are the result of in-source acceleration of particles, their energy and time-dependent transport including interactions in an evolving environment and their escape from source, in addition to source-to-Earth propagation.
Low-luminosity AGN jets constitute the most abundant persistent jet source population in the local Universe. The dominant subset of these, Fanaroff-Riley 0 (FR0) galaxies, have recently been proposed as sources contributing to the ultra-high-energy cosmic ray (UHECR) flux observed on Earth. This presentation assesses the survival, workings and multi-messenger signatures of UHECRs in low-luminosity jet environments, with focus on FR0 galaxies. For this purpose we use our recently developed, fully time-dependent CR particle and photon propagation framework which takes into account all relevant secondary production and energy loss processes, allows for an evolving source environment and efficient treatment of transport non-linearities due to the produced particles/photons being fed back into the simulation chain.
Finally, we propagate UHE cosmic-ray nuclei and secondary cosmogenic photons and neutrinos from FR0 galaxies to Earth for several extragalactic magnetic field scenarios using the CRPropa3 framework, and confront the resulting energy spectra and composition on Earth with the current observational situation.
Ključne besede: multi-messenger astrophysics, ultra-high-energy cosmic rays, very-high-energy gamma-rays
Objavljeno v RUNG: 13.09.2023; Ogledov: 1835; Prenosov: 8
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6. Spatial extension of dark subhalos as seen by Fermi-LAT and the implications for WIMP constraintsJavier Coronado-Blázquez, Miguel Sánchez-Conde, Judit Pérez Romero, Alejandra Aguirre-Santaella, 2022, izvirni znanstveni članek Opis: Spatial extension has been hailed as a “smoking gun” in the gamma-ray search of dark galactic subhalos, which would appear as unidentified sources for gamma-ray telescopes. In this work, we study the sensitivity of the Fermi-LAT to extended subhalos using simulated data based on a realistic sky model. We simulate spatial templates for a set of representative subhalos, whose parameters were derived from our previous work with N-body cosmological simulation data. We find that detecting an extended subhalo and finding an unequivocal signal of angular extension requires, respectively, a flux 2 to 10 times larger than in the case of a pointlike source. By studying a large grid of models, where parameters such as the WIMP mass, annihilation channel, or subhalo model are varied significantly, we obtain the response of the LAT as a function of the product of annihilation cross-section times the J-factor. Indeed, we show that spatial extension can be used as an additional “filter” to reject subhalos candidates among the pool of unidentified LAT sources, as well as a smoking gun for positive identification. For instance, typical angular extensions of a few tenths of a degree are expected for the considered scenarios. Finally, we also study the impact of the obtained LAT sensitivity to such extended subhalos on the achievable dark matter constraints, which are a few times less constraining than comparable point-source limits.
Ključne besede: dark matter, cosmic rays and astroparticles, gamma-ray astronomy, particle astrophysics, particle dark matter
Objavljeno v RUNG: 26.01.2023; Ogledov: 2623; Prenosov: 0
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7. Catalog of long-term transient sources in the first 10 yr of Fermi-LAT dataL. Baldini, J. Ballet, D. Bastieri, J. Becerra Gonzalez, R. Bellazzini, A. Berretta, E. Bissaldi, R. D. Blandford, E. D. Bloom, Gabrijela Zaharijas, 2021, izvirni znanstveni članek Ključne besede: high energy astrophysics, active galactic nuclei, gamma-ray bursts, solar flares, solar gamma-ray emission
Objavljeno v RUNG: 17.02.2022; Ogledov: 2537; Prenosov: 42
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9. Multi-messenger astrophysics with THESEUS in the 2030sRiccardo Ciolfi, Giulia Stratta, Marica Branchesi, Bruce Gendre, Stefan Grimm, Jan Harms, Gavin Paul Lamb, Antonio Martin-Carrillo, Ayden McCann, Andreja Gomboc, 2021, izvirni znanstveni članek Ključne besede: multi-messenger astrophysics, Gamma-ray bursts, compact binary merger, Kilonova
Objavljeno v RUNG: 02.11.2021; Ogledov: 2598; Prenosov: 0
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10. Synergies of THESEUS with the large facilities of the 2030s and guest observer opportunitiesP. Rosati, S. Basa, A. W. Blain, E. Bozzo, Marica Branchesi, L. Christensen, A. Ferrara, Andreja Gomboc, P. T. O'Brien, J. P. Osborne, 2021, izvirni znanstveni članek Ključne besede: multi-messenger astrophysics, Gamma-ray bursts, X-ray sources, gravitation wave sources
Objavljeno v RUNG: 02.11.2021; Ogledov: 2545; Prenosov: 0
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