33 search results for “supernova” in the Public website
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From supernovae to galaxy clusters: observing the chemical enrichment in the hot intra-cluster medium
Promotor: Jelle S. Kaastra Co-promotor: Jelle de Plaa
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Time Domain Imaging of Transient and Variable Radio Sources
This thesis focuses on the study of transient and variable radio sources in the universe.
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Clues from stellar catastrophes
Promotores: S.F. Portegies Zwart, E. M. Rossi
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Astronomer Joe Callingham testifies against killer stars in new show on Discovery Channel
On Friday evening 17 September, Leiden astronomer Joe Callingham can be seen in a new series on Discovery channel. Killers of the Cosmos is about different deadly dangers lurking in the depths of space. Asteroids, cosmic debris, electromagnetic weapons… The show takes a film-noir approach to these threats,…
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Withstanding the cold: energy feedback in simulations of galaxies that include a cold interstellar medium
Understanding how galaxies form, interact, and evolve comes largely from comparing theory predictions with observational data. Numerical simulations of galaxies provide the most accurate approach to testing the theory, as they follow the non-linear evolution of gas and dark matter in great detail and…
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The Great Collapse
Promotor: Prof.dr. S.F. Portegies Zwart
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Tales of Orion: the interplay of gas, dust, and stars in the interstellar medium
Promotores: Prof.dr. A.G.G.M. Tielens & Prof.dr. L. Kaper (UvA)
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Orion's Dragon and Other Stories
Stellar feedback is a crucial ingredient in the evolution of galaxies.
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Multiple star formation: chemistry, physics and coevality
Multiple stars, that is two or more stars composing a gravitationally bound system, are common in the universe.
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Far from home: the science exploitation of the fastest Milky Way stars
The Sun and all the stars in the night sky reside in the Milky Way galaxy. In the at-rest reference frame of the Galaxy, typical stars travel with velocities of about 100-200 kilometres per second.
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Simulating the birth environment of circumstellar discs
Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems.
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How the speed demons of the universe tell us something about the Milky Way
They hurtle along at over a thousand kilometres per second: the fastest stars in the Milky Way. PhD candidate Fraser Evans conducted research into these elusive hypervelocity stars and discovered that they have a lot to teach us, about black holes and supernovae, for example.
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Discovering new physics in extremely bright neutron stars
Astronomer Alexander Mushtukov, currently working at the University of Amsterdam, received a Veni grant of 250,000 euro’s which he will execute in Leiden. Supervised by Simon Portegies Zwart, Mushtukov will use advanced simulations to understand the unknown physics in extremely bright neutron stars.
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A piece of the Universe in the computer
Simulations of galaxies help researchers understand astronomical observations better. The EAGLE simulation, a large project in which Leiden astronomers play a leading role, shows the evolution of the Universe, from just after the Big Bang to the present day.
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Stunning James Webb images show birth and death of massive stars
The James Webb Space Telescope continues to surprise us with stunning pictures, but of what exactly? Astronomer Nienke van der Marel shows with three images how massive stars lead short but explosive lives.
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New generation galaxy formation simulations on the horizon – Evgenii Chaikin received his doctorate with honours
Simulations of galaxy formation provide much more information about galaxies than a telescope. Simulations have been improving significantly in recent years. Astronomer Evgenii Chaikin made such a significant contribution to this field that he graduated with honours on February 27th.
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What is dark matter? Dwarf galaxies offer new insight
By looking at stars in dwarf galaxies research Bas Zoutendijk is trying to gain new insight into dark matter.
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Veni grants for eleven Leiden researchers
Eleven Leiden researchers have been awarded a Veni grant by the Dutch Research Council (NWO). The grant will enable them to develop their research ideas for a period of three years.
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Slovenian and Czech high school students visit Leiden University
Sixty-four high school students from Slovenia, Czech Republic and The Netherlands have visited Leiden University in the week of 7-11 November, as part of the Talent Education Project. They split in eight groups, of which some went to the science faculty to conduct research projects.
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Shedding light on the dark side of the universe
It must be there. We just cannot see it: mysterious dark matter and dark energy in the universe. Henk Hoekstra is one of the many cosmologists who would love to know what exactly these substances consist of. He has received a European research grant of 1.3 euro million to find out.
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Climate and elections: these were your top stories from 2023
The year 2023 saw the earthquake in Turkey and Syria, the Wagner Group rebellion and wildfires and floods as all the weather records were smashed. Our most-read stories were about the climate crisis and the elections: here’s the list.
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Young stars in the Orion Nebula are practicing birth control
Astronomers from Leiden University have discovered that the star wind from a newborn star in the Orion Nebula prevents more stars from forming in the immediate vicinity. They made the discovery with data from the SOFIA observatory. This was announced by co-author Xander Tielens during a press conference…
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BlackGEM telescopes begin hunt for gravitational-wave sources
Three Dutch-Belgian telescopes have started operating at the ESO La Silla Observatory in Chile. This so-called BlackGEM array will scan the southern sky to hunt for cosmic events that produce gravitational waves, such as mergers of neutron stars and black holes. Leiden astronomer Rudolf le Poole is…
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In Memoriam Lodewijk Woltjer
Professor Lodewijk Woltjer passed away on 25 August 2019.
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FLAMINGO: dark matter, ordinary matter, and neutrinos in the biggest cosmological simulation ever
Not only dark matter, but also ordinary matter and dark energy are tracked in the largest ever cosmological computer simulation ever. In the FLAMINGO simulations, you can see virtual galaxies and clusters of galaxies emerging over the course of billions of years. This is no easy task: with more than…
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Gravitational Lenses measure Universe Expansion
It's one of the big cosmology debates: the universe is expanding, but how fast exactly? Two available measurements yield different results. Leiden physicist David Harvey adapted an independent third measurement method, using the light warping properties of galaxies predicted by Einstein. He published…
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The James Webb Telescope takes stunning photos. But what exactly are we looking at?
For over a year now, the James Webb Telescope has been sending stunning images that exceed astronomers’ expectations. The photos are fascinating to see, but what exactly are we looking at? Assistant professor Melissa McClure explains.
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Giant cosmic tsunami wakes up comatose galaxies
Galaxies are often found in clusters, which contain many “red and dead” members that stopped forming stars in the distant past. Now, an international team of astronomers, led by Andra Stroe of Leiden Observatory and David Sobral of Leiden and the University of Lisbon, has discovered that these comatose…
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Multimessenger astronomy to study the structure of Milky Way
For centuries, astronomers have studied the universe by collecting light signals. Since 2015, the confirmation of an important prediction of Einstein allows us to explore the universe in a new way: through gravitational wave radiation. Astronomy PhD candidate Valeriya Korol proposes to use these gravitational…
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Ultra-sensitive radio images reveal thousands of star-forming galaxies in early Universe
An international team of astronomers has published the most sensitive images of the Universe ever taken at low radio frequencies, using the International Low Frequency Array (LOFAR). ‘LOFAR is unique in its ability to make high-quality images of the sky at metre-wavelengths’, said Huub Röttgering, Leiden…
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Gaia spots stars flying between galaxies
A team of Leiden astronomers used the latest set of data from ESA’s Gaia mission to look for high-velocity stars being kicked out of the Milky Way, but were surprised to find stars instead sprinting inwards – perhaps from another galaxy.
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Withstanding the cold: energy feedback in simulations of galaxies that include a cold interstellar medium
PhD defence
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Far From Home: The science exploitation of the fastest milky way stars
PhD defence