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Retirement of Early LOFAR Cycle data (Cycle 0 to Cycle 6)
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Events

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Daily image

Radio 1 live broadcast from the Dwingeloo telescope

© NPO Radio 1

In the early morning hours (2AM-5AM) on December 16, the radio program 'De nacht van KRO-NCRV' broadcast a special three-hour episode live from the Dwingeloo telescope.

The programme was produced by students of the Radioschool to practice making a location-based show.

Benji Heerschop presented the show, with Tammo Jan Dijkema as sidekick and host of the telescope. The show featured many on-site guests, including Harm Munk (astronomy in The Netherlands), Michiel Brentjens (introducing ASTRON), André Offringa (on searching for the EOR signal), David Konijn (on pulsars), and Laura Dreissen (UvA, discussing the search for dark matter). Additionally, there was a tour through the National Park, and a pre-recorded segment from the antenna measurement chamber with Michel Arts. Jan van Muijlwijk made a live EME (Earth-Moon-Earth) contact with a radio amateur in Brazil.

The full three hours can be rewatched and listened to at:

https://www.nporadio1.nl/fragmenten/de-nacht-van/9dbd2421-6060-4a7d-bddc-d8bf011eb1a6/2024-12-16-op-reis-naar-de-sterren-de-nacht-van-kro-ncrv-vanuit-de-grootste-telescoop-in-nederland

Individual segments of the show are also available at https://www.nporadio1.nl/programmas/de-nacht-van/fragmenten?date=16-12-2024

Congratulations to the makers - Aram, Sophia, Joost, Noah, Thijs and Gresa - on their work. This was a very special broadcast.

Colloquia

May 1, 2022

The Commensal Radio Astronomy FAST Survey (CRAFTS)

The Five-hundred-meter Aperture Spherical radio Telescope (FAST) has released its first call for proposal and will be open to the international community next year. Based on a novel technique of high-cadence CAL injection, we have realized the world's first calibrated commensal survey mode, simultaneously taking data for pulsar search, HI galaxies, HI imaging, and FRBs. I introduce here one of the major survey plans, namely, the Commensal Radio Astronomy FAST Survey (CRAFTS, Li et al. 2018), which has discovered more than 100 new pulsars, including a few dozen MSPs, 5 new FRBs, including one new repeater. I will also briefly describe recent FAST results from CRAFTS and other dedicated programs, including new insights into the characteristic energy of FRBs, the formation process of neutron stars, the evolution of interstellar medium, etc.
Speaker
Institute
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May 14, 2022

Extreme UV Emission: Bridging Galaxy Evolution Across Cosmic Time

In the last few years, our first glimpse of the spectral properties of z∼5−7 galaxies has emerged. Deep UV spectra have revealed prominent high-ionization nebular emission lines (i.e., C IV, He II, C III]) indicating that extreme radiation fields may be characteristic of reionization-era systems. While such strong high-ionization emission lines are atypical of the well-studied z∼0−3 galaxy samples, our recent UV spectral campaigns have revealed several galaxies with analogous emission-line features to reionization-era systems. I will discuss the recent detection of extremely strong UV emission in nearby galaxies and the potential sources of their very hard ionizing radiation fields. Such strong detections of high-ionization emission lines have been linked to the leakage of Lyman continuum (LyC) photons (necessary for reionization) both theoretically and observationally. These extreme UV emission-line dwarf galaxies provide a template for the extreme conditions that are important for reionization, however their features are still poorly understood. In preparation for the coming UV window onto the early universe with the advent of ELTs and JWST, I will introduce the COS Legacy Archival Spectroscopic SurveY - an upcoming large HST program designed to disentangle the stellar and nebular spectral signatures of 45 star-forming galaxies. This program will calibrate new UV diagnostics that will allow us to trace galaxy evolution to the distant universe, unveiling the properties of reionization-era galaxies.
Speaker
Institute
Host
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