A5017380970- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Precipitation Measurement and Analysis
- Radio Wave Propagation Studies
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
Max Planck Institute for Radio Astronomy
2021-2024
University of Würzburg
2021-2024
Astronomy and Space
2021-2023
University of Bologna
2023
Commonwealth Scientific and Industrial Research Organisation
2021-2023
North-West University
2021
TU Dortmund University
2021
Friedrich-Alexander-Universität Erlangen-Nürnberg
2021
Aalto University
2021
California Institute of Technology
2021
We report on multiwavelength observations of FRB,20240114A, a nearby (z=0.13), hyperactive, repeating fast radio burst that was discovered in January 2024. performed simultaneous the source with Effelsberg 100-m telescope, Thai National Radio Telescope, Astropeiler Stockert, and X-ray satellite XMM-Newton May On 23, 2024, we detected 459 bursts from using Ultra-Broad-Band (UBB) receiver covering frequency range 1.3,GHz to 6,GHz. All have coverage, which allows us put stringent constraints...
Aims. We introduce the TELAMON program which is using Effelsberg 100-m telescope to monitor radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, specifically TeV blazars and candidate neutrino-associated AGN. Here, we present characterize our main sample TeV-detected blazars. Methods. analyzed data from first ∼2.5 yr observations between August 2020 February 2023 range 14 GHz 45 GHz. During this pilot phase, observed all 59 Northern Hemisphere (i.e., Dec...
Context. High-redshift blazars provide valuable input to studies of the evolution active galactic nuclei (AGN) jets and constraints on cosmological models. Detections at high energies (0.1 < E 100 GeV) these distant sources are rare, but when they exhibit bright gamma-ray flares, we able study them. However, contemporaneous multi-wavelength observations high-redshift objects ( z > 4) during their different periods activity have not been carried out so far. An excellent opportunity for...
Abstract Blazars can be detected from very large distances due to their high luminosity. However, the detection of γ -ray emission blazars beyond z = 3 has only been confirmed for a small number sources. Such observations probe growth supermassive black holes close peak star formation in history galaxy evolution. As result continuous monitoring sample 80 > with Fermi Large Area Telescope (Fermi-LAT), we present first flare 4.31 blazar TXS 1508+572. This source showed activity 2022...
In the past years, evidence has started piling up that some high-energy cosmic neutrinos can be associated with blazars in flaring states. On February 26, 2022, a new blazar-neutrino coincidence been reported: track-like neutrino event IC220225A detected by IceCube is spatially coincident flat-spectrum radio quasar PKS 0215+015. Like previous associations, this source was found to high optical and ${\gamma}$-ray state. Moreover, showed bright outburst, which substantially increases...
The detection of cosmic neutrinos has raised many new questions in astroparticle physics, among the most compelling which is identification neutrino emitters. After more than a decade IceCube operations, promising astrophysical association remains very-high-energy (VHE, $>100$ GeV) blazar TXS 0506+056. Recently, on November 14, 2020 observatory reported well-reconstructed high-energy event, IceCube-201114A, with high probability being astrophysical. Within 90% IceCube-201114A localization...
Aims. We introduce the TELAMON program which is using Effelsberg 100-m telescope to monitor radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, specifically TeV blazars and candidate neutrino-associated AGN. Here, we present characterize our main sample TeV-detected blazars. Methods. analyze data from first ~2.5 years observations between August 2020 February 2023 range 14 GHz 45 GHz. During this pilot phase, have observed all 59 Northern Hemisphere (i.e.,...
High-redshift blazars provide valuable input to studies of the evolution active galactic nuclei (AGN) jets and constraints on cosmological models. Detections at high energies ($0.1<\mathrm{E}<100$ GeV) these distant sources are rare, but when they exhibit bright gamma-ray flares, we able study them. However, contemporaneous multi-wavelength observations high-redshift objects ($z>4$) during their different periods activity have not been carried out so far. An excellent opportunity for such a...
Blazars can be detected from very large distances due to their high luminosity. However, the detection of $\gamma$-ray emission blazars beyond $z=3$ has only been confirmed for a small number sources. Such observations probe growth supermassive black holes close peak star formation in history galaxy evolution. As result continuous monitoring sample 80 $z>3$ with Fermi-LAT, we present first flare $z=4.31$ blazar TXS 1508+572. This source showed activity February August 2022, reaching...
In recent years, evidence has accumulated that some high-energy cosmic neutrinos can be associated with blazars. The strongest for an individual association was found in the case of blazar TXS 0506+056 2017. July 2019, another track-like neutrino event (IC190730A) spatially coincident well-known bright flat-spectrum radio quasar PKS 1502+106. 1502+106 not to a particularly elevated gamma-ray state, but exhibited remarkably outburst at time detection, similar 0506+056. We have performed...
In recent years, evidence has accumulated that some high-energy cosmic neutrinos can be associated with blazars. The strongest for an individual association was found in the case of blazar TXS 0506+056 2017. July 2019, another track-like neutrino event (IC190730A) spatially coincident well-known bright flat-spectrum radio quasar PKS 1502+106. 1502+106 not to a particularly elevated gamma-ray state, but exhibited remarkably outburst at time detection, similar 0506+056. We have performed...
We introduce the TELAMON program, which is using Effelsberg 100-m telescope to monitor radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and candidate neutrino-associated AGN. Thanks its large dish aperture sensitive instrumentation, can yield superior data over other programs low flux-density regime down several 10 mJy. This a particular strength case TeV-emitting blazars, are often comparatively faint sources high-synchrotron peaked...
We introduce the TELAMON program, which is using Effelsberg 100-m telescope to monitor radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and candidate neutrino-associated AGN. Thanks its large dish aperture sensitive instrumentation, can yield data superior over other programs low flux-density regime down several 10 mJy. This a particular strength case TeV-emitting blazars, are often comparatively faint sources high-synchrotron peaked...
The blazar Mrk 421 shows frequent, short flares in the TeV energy regime. Due to fast nature of such episodes, we often fail obtain sufficient simultaneous information about flux variations several bands. To overcome this lack multi-wavelength (MWL) coverage, especially for pre- and post-flare periods, have set up a monitoring program with FACT telescope (TeV energies) Neil Gehrels Swift Observatory (X-rays). On 2019 June 9, showed outburst reaching level more than two times Crab Nebula at...
Abstract In recent years, evidence has started piling up that some high-energy cosmic neutrinos can be associated with blazars in flaring states. On 2022 February 26, a new blazar-neutrino coincidence was reported: the track-like neutrino event IC220225A detected by IceCube is spatially coincident flat-spectrum radio quasar PKS 0215+015. Like previous associations, this source found to high optical and γ -ray state. Moreover, showed bright outburst, which substantially increases probability...
High angular resolution observations with the very long baseline interferometry (VLBI) provide crucial tests for association of neutrinos blazars. The VLBI follow-up have led to unveiling VLBI-scales properties potentially linked neutrino production in jet blazar TXS 0506+056, first source associated a event. In order collect new pieces evidence on connection between radio blazars and production, we performed investigation gamma-ray observed spatial coincidence four events, detected by...
We present recent results of the TELAMON program, which is using Effelsberg 100-m telescope to monitor radio spectra active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and neutrino-associated AGN. Our sample includes all known northern TeV-emitting as well positionally coincident with IceCube neutrino alerts. Polarization can give additional insight into source properties, polarized emission often found vary on different timescales amplitudes than total...
The origin of high-energy cosmic neutrinos detected by the IceCube observatory is a hotly debated topic in astroparticle physics. There growing evidence that some these can be associated with active galactic nuclei (AGN) and especially blazars. Several recent studies have revealed statistical correlation between radio-bright AGN samples neutrino event catalogs. In addition, number individual been found to coincide radio-flaring These observational results strongly call for high-quality, high...
We present recent results of the TELAMON program, which is using Effelsberg 100-m telescope to monitor radio spectra active galactic nuclei (AGN) under scrutiny in astroparticle physics, namely TeV blazars and neutrino-associated AGN. Our sample includes all known Northern TeV-emitting as well positionally coincident with IceCube neutrino alerts. Polarization can give additional insight into source properties, polarized emission often found vary on different timescales amplitudes than total...
The origin of high-energy cosmic neutrinos detected by the IceCube observatory is a hotly debated topic in astroparticle physics. There growing evidence that some these can be associated with active galactic nuclei (AGN) and especially blazars. Several recent studies have revealed statistical correlation between radio-bright AGN samples neutrino event catalogs. In addition, number individual been found to coincide radio-flaring These observational results strongly call for high-quality, high...
The Next Generation Very Large Array (ngVLA) is a planned radio interferometer providing unprecedented sensitivity at wavelengths between 21 cm and 3 mm. Its 263 antenna element array will be spatially distributed across North America to enable both superb low surface brightness recovery sub-milliarcsecond angular resolution imaging. project was developed by the international astronomy community under lead of National Radio Astronomy Observatory (NRAO), anticipated built 2027 2037. Two...