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Daily image

On mosaics and melting points: glass fusing with the PV

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Boxes full of glass shards in every imaginable colour and shade, catching and reflecting the light… The workshop hasn’t even started and I am already in heaven. In the next few hours we’ll let our fantasy loose and combine those gorgeous, individual pieces of glass into something new and beautiful.

First, we choose a form: will our mosaics have a rectangular, round or an entirely different shape? A layer of transparent, colourless glass forms the base that will hold it all together. Coloured shards laid out carefully project our fantasy image into the physical world. Then a big decision needs to be made: do we choose tack fuse or full fuse? In other words, do we want our pieces of glass just melted together so that the individual pieces remain clearly recognisable or do we want to let them fuse fully to create a flat surface?

An unnerving walk follows across a few streets until we reach our teacher’s workshop. Our steps have never been so feather-light before, balancing our trays with the carefully arranged loose pieces of glass on them.

The end of the workshop leaves us in great excitement: how will our pieces turn out? They still have to be put in the oven and fused, which is a lengthy process. We’ll receive the finished works in a few days’ time.

Unpacking our creations is just as exciting as it was making them. There is a lot of clicking of cameras and frequent “wow, that turned out beautiful” exclamations. You can admire the results in this Daily Image. We included examples of mosaics before they were put in the oven (bottom row 1st and 5th), made using full fuse (top row 2nd, middle row 1st, bottom row 4th) and tack fuse (all the others).

With thanks to the ASTRON-JIVE-NOVA Personeelsvereniging (PV) and Atelier de Glazen Parel.

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.
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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.
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