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NEWS

Origin of fast radio bursts come into focus through polarized light

Non-repeating fast radio bursts (FRBs) probably originate from galaxies similar to our Milky Way.

Astronomy
News
Published by the editorial team, 11 June 2024

Violette Impellizzeri to head astronomy and operations department

We are excited that Dr Violette Impellizzeri will join ASTRON as head of the Astronomy & Operations department. She will start her new duties on 1 September 2024. Her research focus is on VLBI investigations of the molecular gas enveloping black holes and spectral line analyses.

Astronomy
News
Published by the editorial team, 31 May 2024

New calibration technique circumvents Earth’s ionosphere

An international team of researchers has developed a new calibration technique to circumvent disturbances of Earth’s ionosphere.

Astronomy
LOFAR
News
telescopes
Published by the editorial team, 6 May 2024

ASTRON has turned 75!

75 years ago today, SRZM (Stichting Radiostraling van Zon en Melkweg/Netherlands Foundation for Radio Astronomy) was founded. This organization would later become ASTRON.

News
Published by the editorial team, 23 April 2024

ASTRON launches database of female experts

Today marks International Women’s Day. This year’s theme is ‘Inspire Inclusion’.

News
Published by the editorial team, 8 March 2024

LOFAR ERIC: Distributed Research Infrastructure for European Astronomical Research Launched

LOFAR ERIC (European Research Infrastructure Consortium) has been officially launched at its first Council meeting today. The world-leading LOFAR (LOw Frequency ARray) Distributed Research Infrastructure has already revolutionised low-frequency radio astronomy research, resulting in an avalanche of scientific publications in the past decade. LOFAR ERIC is now a single legal entity across the European Union. The LOFAR ERIC statutory seat is in Dwingeloo, the Netherlands, hosted by NWO-I/ASTRON (Netherlands Institute for Radio Astronomy; the original designer of LOFAR).

LOFAR
News
Published by the editorial team, 22 January 2024
EVENTS

Open Dag: 6 oktober/Open Day: October 6th

Sun 06 Oct 2024

English follows Dutch   Bezoek ons tijdens onze open dag op 6 oktober Hoe klinkt een dode ster? Hoe maak je onzichtbaar licht zichtbaar? Hoe werkt een zwart gat? Waarom kun je met een radiotelescoop terug in de tijd kijken? Achter al deze en nog veel meer interessante dingen kom je tijdens onze open dag […]

Toegepaste RF-techniek

Mon 04 Nov 2024 - Thu 07 Nov 2024

De cursus Toegepaste RF-techniek bestaat uit een theoriegedeelte (75%) en hands-on sessies in ons eigen lab (25%).
Deelnemers aan deze cursus dienen een hbo werk- en denkniveau te hebben. De deelnemer kent de basisbegrippen van elektronica. Parate kennis van wiskundige concepten is niet vereist, maar komt wel aan de orde bij de transmissielijntheorie. In de cursus wordt ook complexe rekenwijze toegepast.

DAILY IMAGE
Colloquium: Galaxy Clusters at Low Radio Frequencies

© van Weeren

The vast majority of the baryonic matter in the Universe is in the form of plasma, and most of this plasma resides in the large-scale cosmic web structure of the Universe. It is only in the densest and hottest parts of this web that the plasma can be easily observed through thermal Bremsstrahlung at X-ray wavelengths. In these regions, massive clusters of hundreds to thousands of galaxies reside. Clusters grow via the accretion of plasma and through mergers with other clusters and groups. During mergers, energy is dissipated into the intracluster medium through shocks and turbulence. Radio observations have demonstrated that cluster shocks and turbulence can accelerate particles to highly relativistic energies. In the presence of magnetic fields, these cosmic rays emit synchrotron radiation, which can be detected with radio telescopes. These extended synchrotron cluster sources are characterized by steep radio spectra and large megaparsec sizes. Therefore, low-frequency observations, such as those conducted with LOFAR, are crucial for addressing open questions regarding these sources. By examining individual clusters and samples with LOFAR, we have made significant progress in understanding these phenomena. In this talk, I will provide an overview of key results obtained and discuss ongoing efforts to extend LOFAR studies to the highest resolution, greatest depth, and lowest frequencies.

@astron

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