News & Events

This image shows all Dutch LBA dipoles of LOFAR. The pictures were taken in 2025 by the Dutch land registry (kadaster). The cutouts are taken around the coordinates in the LOFAR database, so this picture shows that all coordinates are correct. One station was found to have a small offset, this has been reported.

This image is available at this 5-8cm per pixel resolution - 60x60 pixels per dipole - for every year starting 2021. The version from 2026 will be online very soon.

It is a fun exercise to find all fallen dipoles. Our maintenance crew regularly fixes this. Also, can you spot the one Nenufar dipole?

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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

Host

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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The Commensal Radio Astronomy FAST Survey (CRAFTS)

Extreme UV Emission: Bridging Galaxy Evolution Across Cosmic Time

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News & Events

News

Events

Daily image

Colloquia

The Commensal Radio Astronomy FAST Survey (CRAFTS)

Extreme UV Emission: Bridging Galaxy Evolution Across Cosmic Time

Subscribe to the ASTRON newsletter. For previous editions, click here.

Subscribe to the LOFAR newsletter:

For previous editions, click here.

To view the current and previous editions of the LOFAR2.0 newsletter, click here.

@astron

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