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Becherini, YvonneORCID iD iconorcid.org/0000-0002-2115-2930
Publications (10 of 239) Show all publications
Abdollahi, S., Baldini, L., Bellazzini, R., Berenji, B., Bissaldi, E., Bonino, R., . . . Wong, S. L. (2026). Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC, and VERITAS. Journal of Cosmology and Astroparticle Physics (3), Article ID 035.
Open this publication in new window or tab >>Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, HESS, MAGIC, and VERITAS
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2026 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, no 3, article id 035Article in journal (Refereed) Published
Abstract [en]

Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low astrophysical background. The sensitivity of these searches is improved by combining the observations of dSphs made by different gamma-ray telescopes. We present the results of a combined search by the most sensitive currently operating gamma-ray telescopes, namely: the satellite-borne Fermi-LAT telescope; the ground-based imaging atmospheric Cherenkov telescope arrays H.E.S.S., MAGIC, and VERITAS; and the HAWC water Cherenkov detector. Individual datasets were analyzed using a common statistical approach. Results were subsequently combined via a global joint likelihood analysis. We obtain constraints on the velocity-weighted cross section〈σv〉for DM self-annihilation as a function of the DM particle mass. This five-instrument combination allows the derivation of up to 2-3 times more constraining upper limits on〈σv〉than the individual results over a wide mass range spanning from 5 GeV to 100 TeV. Depending on the DM content modeling, the 95% confidence level observed limits reach 1.5×10-24 cm3s-1 and 3.2×10-25 cm3s-1, respectively, in the τ+τ- annihilation channel for a DM mass of 2 TeV.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2026
Keywords
dark matter experiments, dwarfs galaxies, gamma ray experiments
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-145813 (URN)10.1088/1475-7516/2026/03/035 (DOI)001717872100001 ()2-s2.0-105035889393 (Scopus ID)
Available from: 2026-04-07 Created: 2026-04-07 Last updated: 2026-05-07Bibliographically approved
Aharonian, F., Backes, M., Batzofin, R., Becherini, Y., Berge, D., Bernlohr, K., . . . Zhong, W. (2026). HESS detection and multi-wavelength study of the z ∼ 1 blazar PKS 0346-27. Astronomy and Astrophysics, 706, Article ID A246.
Open this publication in new window or tab >>HESS detection and multi-wavelength study of the z ∼ 1 blazar PKS 0346-27
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2026 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 706, article id A246Article in journal (Refereed) Published
Abstract [en]

Context. PKS 0346-27 is a low synchrotron peaked blazar at redshift 0.991. The very high energy (VHE; E > 100 GeV) spectra of blazars are always affected by gamma gamma absorption by the extragalactic background light (EBL), and subsequently no blazars have been detected in VHE gamma-rays at redshifts exceeding 1. Aims. This is the goal of a target-of-opportunity (ToO) programme by H.E.S.S.: to observe flaring high-redshift (z greater than or similar to 1) blazars. Importantly, extending the redshift range of VHE-detected blazars to z greater than or similar to 1 will yield insights into the cosmological evolution of both the VHE blazar population and the EBL. Methods. We report H.E.S.S. ToO and multi-wavelength observations of the blazar PKS 0346-27. We analysed and modelled the H.E.S.S. data together with simultaneous data from Fermi-LAT, Swift (XRT and UVOT), using single-zone leptonic and hadronic models. Results. PKS 0346-27 was detected by H.E.S.S. at a significance of 6.3 sigma during one night on 3 November 2021, while for other nights before and after this day, upper limits on the VHE flux have been determined. No evidence for intra-night gamma-ray variability has been found. A flare in high-energy (E > 100 MeV) gamma-rays detected by Fermi-LAT preceded the H.E.S.S. detection by 2 days. A fit with a single-zone emission model to the contemporaneous spectral energy distribution during the detection night was possible with a proton-synchrotron-dominated hadronic model, requiring a proton-kinetic-energy-dominated jet power temporarily exceeding the source's Eddington limit, although alternative (e.g. multi-zone) models cannot be ruled out. A one-zone leptonic model is, in principle, also able to fit the flare-state spectral energy distribution. However, it requires implausible parameter choices, in particular, extreme Doppler and bulk Lorentz factors of greater than or similar to 80.
Place, publisher, year, edition, pages
EDP Sciences, 2026
Keywords
radiation mechanisms: non-thermal, relativistic processes, galaxies: active, galaxies: individual: pks 0346-27, galaxies: jets, quasars: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:lnu:diva-145420 (URN)10.1051/0004-6361/202557228 (DOI)001691004100025 ()2-s2.0-105030243586 (Scopus ID)
Available from: 2026-03-09 Created: 2026-03-09 Last updated: 2026-03-23Bibliographically approved
Abhir, J., Biland, A., Brand, K., Bretz, T., Dorner, D., Eisenberger, L., . . . D'Ammando, F. (2026). Prompt Searches for Very-high-energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts. Astrophysical Journal, 997(2), Article ID 141.
Open this publication in new window or tab >>Prompt Searches for Very-high-energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts
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2026 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 997, no 2, article id 141Article in journal (Refereed) Published
Abstract [en]

The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multimessenger approach, which seeks to detect the gamma-rays that accompany neutrinos as they are produced at their sources. Multimessenger observations have so far provided the first evidence for a neutrino source, illustrated by the joint detection of the flaring blazar TXS 0506+056 in high-energy (E > 1 GeV) and very-high-energy (VHE; E > 100 GeV) gamma-rays in coincidence with the high-energy neutrino IceCube-170922A, identified by IceCube. Imaging atmospheric Cherenkov telescopes (IACTs), namely FACT, H.E.S.S., MAGIC, and VERITAS, continue to conduct extensive neutrino target-of-opportunity follow-up programs. These programs have two components: follow-up observations of single astrophysical neutrino candidate events (such as IceCube-170922A), and observation of known gamma-ray sources after the identification of a cluster of neutrino events by IceCube. Here we present a comprehensive analysis of follow-up observations of high-energy neutrino events observed by the four IACTs between 2017 September (after the IceCube-170922A event) and 2021 January. Our study found no associations between gamma-ray sources and the observed neutrino events. We provide a detailed overview of each neutrino event and its potential counterparts. Furthermore, a joint analysis of all IACT data is included, yielding combined upper limits on the VHE gamma-ray flux.
Place, publisher, year, edition, pages
American Astronomical Society, 2026
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-145417 (URN)10.3847/1538-4357/ae2c4e (DOI)001672750800001 ()2-s2.0-105036063624 (Scopus ID)
Available from: 2026-03-09 Created: 2026-03-09 Last updated: 2026-05-07Bibliographically approved
Acharyya, A., Aharonian, F., Arcaro, C., Ashkar, H., Backes, M., Martins, V. B., . . . Zech, A. (2026). The second HESS gamma-ray burst catalogue: 15 years of observations with the HESS telescopes. Astronomy and Astrophysics, 707, Article ID A382.
Open this publication in new window or tab >>The second HESS gamma-ray burst catalogue: 15 years of observations with the HESS telescopes
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2026 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 707, article id A382Article in journal (Refereed) Published
Abstract [en]

Context. Recent observational efforts using imaging atmospheric Cherenkov telescopes (IACTs) have led to firm detections of very-high-energy (VHE) signals from bright gamma-ray bursts (GRBs), often at moderate redshifts.

Aims. This work presents 15 years of H.E.S.S. GRB observations and examines their implications through population comparisons and selected modelling cases.

Methods. GRBs are a key science target of the High Energy Stereoscopic System (H.E.S.S.). With a low-energy threshold (less than or similar to 100 GeV) and rapid repointing capabilities, H.E.S.S. can begin follow-up observations within tens of seconds after a GRB trigger, covering the late prompt or early afterglow phases.

Results. We report GRB follow-up observations with H.E.S.S. from 2004 to 2019, which resulted in no significant VHE signals (aside from the detections of GRB 180720B and GRB 190829A). The resulting upper limits comprise the largest set available for GRBs at VHE.

Conclusions. A subset of bursts with favourable conditions were selected for X-ray analysis and emission modelling. Population studies were performed to compare detected and non-detected GRBs. The results indicate that VHE-detected GRBs are not a distinct population, but tend to feature luminous X-ray emission and favourable redshift and observing conditions. This highlights the potential of next-generation IACTs such as the Cherenkov Telescope Array Observatory (CTAO), whose lower energy threshold will enhance the detection of fainter and more distant GRBs.
Place, publisher, year, edition, pages
EDP Sciences, 2026
Keywords
radiation mechanisms: non-thermal, gamma-ray burst: general, gamma rays: general
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:lnu:diva-146132 (URN)10.1051/0004-6361/202555942 (DOI)001731309600001 ()
Available from: 2026-04-27 Created: 2026-04-27 Last updated: 2026-05-11Bibliographically approved
Aharonian, F., Benkhali, F. A., Aschersleben, J., Ashkar, H., Martins, V. B., Batzofin, R., . . . Zywucka, N. (2025). Detection of very high-energy gamma-ray emission from Eta Carinae during its 2020 periastron passage. Astronomy and Astrophysics, 694, Article ID A328.
Open this publication in new window or tab >>Detection of very high-energy gamma-ray emission from Eta Carinae during its 2020 periastron passage
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2025 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 694, article id A328Article in journal (Refereed) Published
Abstract [en]

The colliding-wind binary system eta Carinae has been identified as a source of high-energy (HE, below similar to 100 GeV) and very high-energy (VHE, above similar to 100 GeV) gamma rays in the last decade, making it unique among these systems. With its eccentric 5.5-year-long orbit, the periastron passage, during which the stars are separated by only 1-2 au, is an intriguing time interval to probe particle acceleration processes within the system. In this work, we report on an extensive VHE observation campaign that for the first time covers the full periastron passage carried out with the High Energy Stereoscopic System (H.E.S.S.) in its 5-telescope configuration with upgraded cameras. The VHE gamma-ray emission from eta Carinae was detected during the periastron passage with a steep spectrum with the spectral index Gamma = 3.3 +/- 0.2stat +/- 0.1syst. Together with previous and follow-up observations, we derive a long-term light curve sampling one full orbit, showing hints of an increase in the VHE flux towards periastron, but no hint of variability during the passage itself. An analysis of contemporaneous Fermi-LAT data shows that the VHE spectrum represents a smooth continuation of the HE spectrum. From modelling the combined spectrum, we conclude that the gamma-ray emission region is located at distances of similar to 10-20 au from the centre of mass of the system and that protons are accelerated up to energies of at least several tera-electronvolts inside the system in this phase.
Place, publisher, year, edition, pages
EDP Sciences, 2025
Keywords
massive binary-system, 3d dynamical model, colliding winds, acceleration, nebula, orbit, car, constraints
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-138119 (URN)10.1051/0004-6361/202453052 (DOI)001439520700001 ()2-s2.0-85219218590 (Scopus ID)
Available from: 2025-04-22 Created: 2025-04-22 Last updated: 2025-05-05Bibliographically approved
Aharonian, F., Archaryya, A., Aschersleben, J., Ashkar, H., Backes, M., Barbosa Martins, V., . . . Żywucka, N. (2025). H.E.S.S. programme searching for VHE gamma rays associated with FRBs. Journal of Cosmology and Astroparticle Physics, 2025(7), Article ID 086.
Open this publication in new window or tab >>H.E.S.S. programme searching for VHE gamma rays associated with FRBs
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2025 (English)In: Journal of Cosmology and Astroparticle Physics, E-ISSN 1475-7516, Vol. 2025, no 7, article id 086Article in journal (Refereed) Published
Abstract [en]

Fast Radio Bursts (FRBs) are highly energetic, extremely short-lived bursts of radio flashes. Despite extensive research, the exact cause of these outbursts remains speculative. The high luminosity, short duration, and high dispersion measure of these events suggest they result from extreme, high-energy extragalactic sources, such as highly magnetized and rapidly spinning neutron stars known as magnetars. The number of detected FRBs, including repeating ones, has grown rapidly in recent years. Except for FRB 20200428D, and FRB-like radio burst that is associated to Galactic magnetar SGR 1935+2154, no multi-wavelength counterpart to any FRB has been detected yet. The High Energy Stereoscopic System (H.E.S.S.) telescope has developed a program to follow up FRBs searching for their gamma-ray counterparts, helping to uncover the nature of FRBs and FRB sources. This paper provides an overview of the searches for FRB sources conducted by H.E.S.S., including follow-up observations and simultaneous multi-wavelength campaigns with radio and X-ray observatories. Among the FRB sources observed by H.E.S.S., nine are localized with redshifts ranging between 0.11 and 0.492 from 2015 to 2022. No significant very high energy (VHE) emission was detected during these observations. We report constraints on the VHE luminosity ranging from 1044 erg s-1 and 1048 erg s-1, placing limits on the FRB's region persistent VHE emission and potential FRB afterglow emission across timescales from hours to years.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2025
Keywords
gamma ray experiments, neutron stars, radio pulsars
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-142861 (URN)10.1088/1475-7516/2025/07/086 (DOI)001552924000001 ()2-s2.0-105011862191 (Scopus ID)
Available from: 2025-12-29 Created: 2025-12-29 Last updated: 2026-07-10Bibliographically approved
Abe, H., Abe, S., Acciari, V. A., Agudo, I., Aniello, T., Ansoldi, S., . . . Zheng, W. (2025). Multiwavelength study of OT 081: broadband modelling of a transitional blazar. Monthly notices of the Royal Astronomical Society, 540(1), 364-384
Open this publication in new window or tab >>Multiwavelength study of OT 081: broadband modelling of a transitional blazar
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2025 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 540, no 1, p. 364-384Article in journal (Refereed) Published
Abstract [en]

OT 081 is a well-known, luminous blazar that is remarkably variable in many energy bands. We present the first broadband study of the source, which includes very high energy (VHE, E _ 100 GeV) γ-ray data taken by the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov telescopes) and H.E.S.S. (High Energy Stereoscopic System) imaging Cherenkov telescopes. The discovery of VHE γ-ray emission happened during a high state of gamma-ray activity in July 2016, observed by many instruments from radio to VHE γ-rays. We identify four states of activity of the source, one of which includes VHE γ-ray emission. Variability in the VHE domain is found on daily time-scales. The intrinsic VHE spectrum can be described by a power law with index 3 . 27 +/- 0.44stat +/- 0.15sys (MAGIC) and 3 . 39 +/- 0.58stat +/- 0.64sys (H.E.S.S.) in the energy range of 55-300 and 120-500 GeV, respectively. The broadband emission cannot be successfully reproduced by a simple one-zone synchrotron self-Compton model. Instead, an additional external Compton component is required. We test a lepto-hadronic model that reproduces the data set well and a proton-synchrotron-dominated model that requires an extreme proton luminosity. Emission models that are able to successfully represent the data place the emitting region well outside of the broad-line region to a location at which the radiative environment is dominated by the infrared thermal radiation field of the dusty torus. In the scenario described by this flaring activity, the source appears to be a flat spectrum radio quasar (FSRQ), in contrast with past categorizations. This suggests that the source can be considered to be a transitional blazar, intermediate between BL Lac and FSRQ objects.
Place, publisher, year, edition, pages
Oxford University Press (OUP), 2025
Keywords
galaxies: active, galaxies: individual: OT 081, galaxies: jets, gamma-rays: galaxies, quasars: general, radiation mechanisms: non-thermal
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-139402 (URN)10.1093/mnras/stae2469 (DOI)001491300700001 ()2-s2.0-105005657606 (Scopus ID)
Available from: 2025-06-12 Created: 2025-06-12 Last updated: 2025-08-07Bibliographically approved
Aharonian, F., Benkhali, F. A., Aschersleben, J., Ashkar, H., Backes, M., Martins, V. B., . . . Zywucka, N. (2025). The HESS extragalactic sky survey with the first decade of observations. Astronomy and Astrophysics, 695, Article ID A261.
Open this publication in new window or tab >>The HESS extragalactic sky survey with the first decade of observations
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2025 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 695, article id A261Article in journal (Refereed) Published
Abstract [en]

The results of the first extragalactic gamma-ray survey by the High Energy Stereoscopic System (H.E.S.S.) are presented. The survey comprises 2720 hours of very high-energy gamma-ray observations of the extragalactic sky, recorded with H.E.S.S. from 2004 up to the end of 2012. These data have been re-analysed using a common consistent set of up-to-date data calibration and analysis tools. From this analysis, a list of 23 detected objects, predominantly blazars, was obtained. This catalogue was assessed in terms of the source class populations that it contains. The level of source parameter bias for the blazar sources, probed by this observational dataset, was evaluated using Monte-Carlo simulations. Spectral results obtained with the H.E.S.S. data were compared with the Fermi-LAT catalogues to present the full gamma-ray picture of the detected objects. Lastly, this unique dataset was used to assess the contribution of BL Lacertae objects and flat-spectrum radio quasars to the extragalactic gamma-ray background light at several hundreds of giga-electronvolts. These results are accompanied by the release of the high-level data to the astrophysical community.
Place, publisher, year, edition, pages
EDP Sciences, 2025
Keywords
gamma-ray emission, dark-matter annihilation, spectral energy-distribution, fermi-lat, multiwavelength observations, radio galaxies, pks 1510-089, upper limits, crab-nebula, 3rd catalog
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-140432 (URN)10.1051/0004-6361/202452723 (DOI)001489985800002 ()2-s2.0-105001650824 (Scopus ID)
Available from: 2025-07-02 Created: 2025-07-02 Last updated: 2025-08-07Bibliographically approved
Aharonian, F., Benkhali, F. A., Aschersleben, J., Ashkar, H., Backes, M., Martins, V. B., . . . Collaboration, H. E. (2024). Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433. Science, 383(6681), 402-406
Open this publication in new window or tab >>Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433
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2024 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 383, no 6681, p. 402-406Article in journal (Refereed) Published
Abstract [en]

SS 433 is a microquasar, a stellar binary system that launches collimated relativistic jets. We observed SS 433 in gamma rays using the High Energy Stereoscopic System (H.E.S.S.) and found an energy-dependent shift in the apparent position of the gamma-ray emission from the parsec-scale jets. These observations trace the energetic electron population and indicate that inverse Compton scattering is the emission mechanism of the gamma rays. Our modeling of the energy-dependent gamma-ray morphology constrains the location of particle acceleration and requires an abrupt deceleration of the jet flow. We infer the presence of shocks on either side of the binary system, at distances of 25 to 30 parsecs, and that self-collimation of the precessing jets forms the shocks, which then efficiently accelerate electrons.
Place, publisher, year, edition, pages
American Association for the Advancement of Science (AAAS), 2024
Keywords
RESOLUTION RADIO OBSERVATIONS, COSMIC-RAY PRODUCTION, 11 CM WAVELENGTH, PARTICLE-ACCELERATION, CONTINUUM SURVEY, GALACTIC PLANE, GAMMA-RAYS, SS-433, ENERGY, W50
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Natural Science, Physics
Identifiers
urn:nbn:se:lnu:diva-143177 (URN)10.1126/science.adi2048 (DOI)001412871800001 ()38271522 (PubMedID)2-s2.0-85183488433 (Scopus ID)
Available from: 2025-11-26 Created: 2025-11-26 Last updated: 2025-11-26Bibliographically approved
Algaba, J. C., Balokovic, M., Chandra, S., Cheong, W.-Y. -., Cui, Y.-Z. -., D'Ammando, F., . . . Zhong, W. (2024). Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode. Astronomy and Astrophysics, 692, Article ID A140.
Open this publication in new window or tab >>Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode
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2024 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 692, article id A140Article in journal (Refereed) Published
Abstract [en]

Context. The nearby elliptical galaxy M87 contains one of only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL) facilities (from radio to gamma-ray energies) took part in the second M87 EHT campaign. Aims. The goal of this extensive MWL campaign was to better understand the physics of the accreting black hole M87*, the relationship between the inflow and inner jets, and the high-energy particle acceleration. Understanding the complex astrophysics is also a necessary first step towards performing further tests of general relativity. Methods. The MWL campaign took place in April 2018, overlapping with the EHT M87* observations. We present a new, contemporaneous spectral energy distribution (SED) ranging from radio to very high-energy (VHE) gamma-rays as well as details of the individual observations and light curves. We also conducted phenomenological modelling to investigate the basic source properties. Results. We present the first VHE gamma-ray flare from M87 detected since 2010. The flux above 350 GeV more than doubled within a period of approximate to 36 hours. We find that the X-ray flux is enhanced by about a factor of two compared to 2017, while the radio and millimetre core fluxes are consistent between 2017 and 2018. We detect evidence for a monotonically increasing jet position angle that corresponds to variations in the bright spot of the EHT image. Conclusions. Our results show the value of continued MWL monitoring together with precision imaging for addressing the origins of high-energy particle acceleration. While we cannot currently pinpoint the precise location where such acceleration takes place, the new VHE gamma-ray flare already presents a challenge to simple one-zone leptonic emission model approaches, and it emphasises the need for combined image and spectral modelling.
Place, publisher, year, edition, pages
EDP Sciences, 2024
Keywords
galaxies: active, galaxies: individual: M 87, galaxies: jets, galaxies: nuclei
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
urn:nbn:se:lnu:diva-136893 (URN)10.1051/0004-6361/202450497 (DOI)001406602800001 ()2-s2.0-105034455593 (Scopus ID)
Available from: 2025-02-18 Created: 2025-02-18 Last updated: 2026-08-31Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2115-2930

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