E. Angelakis
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View article: Detection of Compton Scattering in the Jet of 3C 84
Detection of Compton Scattering in the Jet of 3C 84 Open
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View article: Detection of Compton Scattering in the Jet of 3C 84
Detection of Compton Scattering in the Jet of 3C 84 Open
3C 84 is the brightest cluster galaxy in the Perseus Cluster. It is among the closest radio-loud active galaxies and among the very few that can be detected from low-frequency radio up to TeV γ -rays. Here we report on the first X-ray pola…
View article: Tracing the invisible: Spatial patterns of swine brucellosis in wildlife and domestic pigs of northeast Portugal
Tracing the invisible: Spatial patterns of swine brucellosis in wildlife and domestic pigs of northeast Portugal Open
The interface between wild boar and domestic pigs represents is a critical hotspot for the spillover and spillback of several diseases, including brucellosis. This cross-sectional study assessed the seroprevalence of Brucella spp. and B. s…
View article: Long term multi-wavelength analysis of the Flat Spectrum Radio Quasar OP 313
Long term multi-wavelength analysis of the Flat Spectrum Radio Quasar OP 313 Open
View article: Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations
Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations Open
Polarimetric properties of blazars allow us to put constraints on the acceleration mechanisms that fuel their powerful jets. By studying the multiwavelength polarimetric behaviour of high synchrotron peaked (HSP) and low synchrotron peaked…
View article: A Two-week IXPE Monitoring Campaign on Mrk 421
A Two-week IXPE Monitoring Campaign on Mrk 421 Open
X-ray polarization is a unique new probe of the particle acceleration in astrophysical jets made possible through the Imaging X-ray Polarimetry Explorer. Here we report on the first dense X-ray polarization monitoring campaign on the blaza…
View article: Helical magnetic field structure in 3C 273
Helical magnetic field structure in 3C 273 Open
We present a study on rotation measure (RM) of the quasar 3C 273. This analysis aims to discern the magnetic field structure and its temporal evolution. The quasar 3C 273 is one of the most studied active galactic nuclei due to its high br…
View article: Determining the origin of the X-ray emission in blazars through multiwavelength polarization
Determining the origin of the X-ray emission in blazars through multiwavelength polarization Open
The origin of the high-energy emission in astrophysical jets from black holes is a highly debated issue. This is particularly true for jets from supermassive black holes, which are among the most powerful particle accelerators in the Unive…
View article: High Optical-to-X-Ray Polarization Ratio Reveals Compton Scattering in BL Lacertae’s Jet
High Optical-to-X-Ray Polarization Ratio Reveals Compton Scattering in BL Lacertae’s Jet Open
Blazars, supermassive black hole systems with highly relativistic jets aligned with the line of sight, are the most powerful long-lived emitters of electromagnetic emission in the Universe. We report here on a radio-to-gamma-ray multiwavel…
View article: Genotyping of Coxiella burnetii in Ticks Collected from Wildlife in Greece
Genotyping of Coxiella burnetii in Ticks Collected from Wildlife in Greece Open
Coxiella burnetii is a zoonotic pathogen that causes Q fever in humans and coxiellosis in animals. Ticks are known to be the main vector for Coxiella transmission among wildlife and domestic animals, and they can also act as potential rese…
View article: X-Ray Polarization of the High-synchrotron-peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-Ray Flux States
X-Ray Polarization of the High-synchrotron-peak BL Lacertae Object 1ES 1959+650 during Intermediate and High X-Ray Flux States Open
We report the Imaging X-ray Polarimetry Explorer (IXPE) polarimetric and simultaneous multiwavelength observations of the high-energy-peaked BL Lacertae object (HBL) 1ES 1959+650, performed in 2022 October and 2023 August. In 2022 October,…
View article: IXPE observation of the low-synchrotron peaked blazar S4 0954+65 during an optical-X-ray flare
IXPE observation of the low-synchrotron peaked blazar S4 0954+65 during an optical-X-ray flare Open
The X-ray polarization observations, made possible with the Imaging X-ray Polarimetry Explorer (IXPE), offer new ways of probing high-energy emission processes in astrophysical jets from blazars. Here, we report the first X-ray polarizatio…
View article: Ticks and Tick-Borne Pathogens in Wild Animals and Birds from Two Rehabilitation Facilities in Greece
Ticks and Tick-Borne Pathogens in Wild Animals and Birds from Two Rehabilitation Facilities in Greece Open
Ticks are temporary ectoparasites that serve as vectors for a wide range of pathogens affecting both wildlife and humans. In Greece, research on the prevalence of tick-borne pathogens in wildlife is limited. This study investigates the pre…
View article: Helical magnetic field structure in 3C 273. A Faraday rotation analysis using multi-frequency polarimetric VLBA data
Helical magnetic field structure in 3C 273. A Faraday rotation analysis using multi-frequency polarimetric VLBA data Open
We present a study on rotation measure (RM) of the quasar 3C 273. This analysis aims to discern the magnetic field structure and its temporal evolution. The quasar 3C 273 is one of the most studied active galactic nuclei due to its high br…
View article: IXPE Observation of the Low-Synchrotron Peaked Blazar S4 0954+65 During An Optical-X-ray Flare
IXPE Observation of the Low-Synchrotron Peaked Blazar S4 0954+65 During An Optical-X-ray Flare Open
The X-ray polarization observations made possible with the Imaging X-ray Polarimetry Explorer (IXPE) offer new ways of probing high-energy emission processes in astrophysical jets from blazars. Here we report on the first X-ray polarizatio…
View article: A Two-Week $IXPE$ Monitoring Campaign on Mrk 421
A Two-Week $IXPE$ Monitoring Campaign on Mrk 421 Open
X-ray polarization is a unique new probe of the particle acceleration in astrophysical jets made possible through the Imaging X-ray Polarimetry Explorer. Here we report on the first dense X-ray polarization monitoring campaign on the blaza…
View article: X-Ray and Multiwavelength Polarization of Mrk 501 from 2022 to 2023
X-Ray and Multiwavelength Polarization of Mrk 501 from 2022 to 2023 Open
We present multiwavelength polarization measurements of the luminous blazar Mrk 501 over a 14 month period. The 2–8 keV X-ray polarization was measured with the Imaging X-ray Polarimetry Explorer (IXPE) with six 100 ks observations spannin…
View article: Observations of Low and Intermediate Spectral Peak Blazars with the Imaging X-Ray Polarimetry Explorer
Observations of Low and Intermediate Spectral Peak Blazars with the Imaging X-Ray Polarimetry Explorer Open
We present X-ray polarimetry observations from the Imaging X-ray Polarimetry Explorer (IXPE) of three low spectral peak and one intermediate spectral peak blazars, namely 3C 273, 3C 279, 3C 454.3, and S5 0716+714. For none of these objects…
View article: A Retrospective Study of Genetic Characterization in Suspected Visceral Leishmaniasis Cases in Greece, 2005 to 2020
A Retrospective Study of Genetic Characterization in Suspected Visceral Leishmaniasis Cases in Greece, 2005 to 2020 Open
Leishmania infantum is considered the predominant Leishmania species responsible for visceral leishmaniasis (VL) in Greece but limited molecular-typing-based studies have been performed so far. We retrospectively analyzed data and serum sa…
View article: X-ray and multiwavelength polarization of Mrk 501 from 2022 to 2023
X-ray and multiwavelength polarization of Mrk 501 from 2022 to 2023 Open
We present multiwavelength polarization measurements of the luminous blazar Mrk~501 over a 14-month period. The 2--8 keV X-ray polarization was measured with the Imaging X-ray Polarimetry Explorer (IXPE) with six 100-ks observations spanni…
View article: IXPE observation of PKS 2155–304 reveals the most highly polarized blazar
IXPE observation of PKS 2155–304 reveals the most highly polarized blazar Open
We report the X-ray polarization properties of the high-synchrotron-peaked (HSP) blazar PKS 2155−304 based on observations with the Imaging X-ray Polarimetry Explorer (IXPE). We observed the source between Oct 27 and Nov 7, 2023. We also c…
View article: IXPE observation of PKS 2155-304 reveals the most highly polarized blazar
IXPE observation of PKS 2155-304 reveals the most highly polarized blazar Open
We report the X-ray polarization properties of the high-synchrotron-peaked (HSP) blazar PKS 2155$-$304 based on observations with the Imaging X-ray Polarimetry Explorer (IXPE). We observed the source between Oct 27 and Nov 7, 2023. We also…
View article: X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200
X-Ray Polarization of the BL Lacertae Type Blazar 1ES 0229+200 Open
We present polarization measurements in the 2–8 keV band from blazar 1ES 0229+200, the first extreme high synchrotron peaked source to be observed by the Imaging X-ray Polarimetry Explorer (IXPE). Combining two exposures separated by about…
View article: Magnetic field properties inside the jet of Mrk 421
Magnetic field properties inside the jet of Mrk 421 Open
Aims. We aim to probe the magnetic field geometry and particle acceleration mechanism in the relativistic jets of supermassive black holes. Methods. We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotro…
View article: Magnetic Field Properties inside the Jet of Mrk 421: Multiwavelength Polarimetry Including the Imaging X-ray Polarimetry Explorer
Magnetic Field Properties inside the Jet of Mrk 421: Multiwavelength Polarimetry Including the Imaging X-ray Polarimetry Explorer Open
We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging X-ray Polarimetry Explorer (IXPE) measurements on 2022 December 6-8. We detected X-ray polarization of…
View article: X-ray Polarization of the BL Lac Type Blazar 1ES 0229+200
X-ray Polarization of the BL Lac Type Blazar 1ES 0229+200 Open
We present polarization measurements in the $2-8 \thinspace \mathrm{keV}$ band from blazar 1ES 0229+200, the first extreme high synchrotron peaked source to be observed by the Imaging X-ray Polarimetry Explorer (IXPE). Combining two exposu…
View article: The RoboPol sample of optical polarimetric standards
The RoboPol sample of optical polarimetric standards Open
Context. Optical polarimeters are typically calibrated using measurements of stars with known and stable polarization parameters. However, there is a lack of such stars available across the sky. Many of the currently available standards ar…
View article: IXPE and Multiwavelength Observations of Blazar PG 1553+113 Reveal an Orphan Optical Polarization Swing
IXPE and Multiwavelength Observations of Blazar PG 1553+113 Reveal an Orphan Optical Polarization Swing Open
The lower-energy peak of the spectral energy distribution of blazars has commonly been ascribed to synchrotron radiation from relativistic particles in the jets. Despite the consensus regarding jet emission processes, the particle accelera…
View article: IXPE and multi-wavelength observations of blazar PG 1553+113 reveal an orphan optical polarization swing
IXPE and multi-wavelength observations of blazar PG 1553+113 reveal an orphan optical polarization swing Open
The lower energy peak of the spectral energy distribution of blazars has commonly been ascribed to synchrotron radiation from relativistic particles in the jets. Despite the consensus regarding jet emission processes, the particle accelera…
View article: The RoboPol sample of optical polarimetric standards
The RoboPol sample of optical polarimetric standards Open
Optical polarimeters are typically calibrated using measurements of stars with known and stable polarization parameters. However, there is a lack of such stars available across the sky. Many of the currently available standards are not sui…