Oskar Klein Centre

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Close-up of the upper arc segment, containing six (complete or partial) images of the galaxy.

Astronomers find galaxy revealing its innermost secrets – in 12 copies

An international group of astronomers, led by Thøger Emil Rivera-Thorsen from the Oskar Klein Centre, have found a distant galaxy which has a rarely seen hole in its interstellar gas, allowing a direct view to the hot, massive stars at its very center. Luckily this galaxy is lensed by a foreground galaxy cluster and the resulting 12 images of the original galaxy can be studied in great detail.

A spiral created by two neutron stars that are swirling closer and closer to each other.

OKC researchers will use Wallenberg grant to study light from merging neutron stars

The era of multi-messenger astrophysics has just begun and recently a merging neutron star system has been detected in gravitational waves and subsequently electromagnetically. This grant supports a concentrated research effort across groups at the OKC to study future neutron star merger events from their detection, through simulations and modeling and extending to their electromagnetic follow-up and the use of these events to measure the expansion rate of our Universe.

In the center of this image, taken with the NASA/ESA Hubble Space Telescope, is the galaxy cluster S

How Astronomers Use Ginormous Natural Lenses to Study Distant Space Explosions

OKC postdoctoral researcher Suhail Dhawan explains lensed supernovae and how they will be used to study gravity, the expansion of the universe, and some of the brightest explosions we know.

Our Milky Way galaxy with known halo streams of stars shown above and below.

GD-1 Stellar Stream and Dark Matter in Our Milky Way

Streams of stars orbiting in the halo of our Milky Way Galaxy can be used to constrain the shape of our Galaxy's dark matter halo and the amount of mass inside the radius of our Sun's orbit.

Pablo Fernández de Salas. Photo by Serena Nobili

The blog

Interview with Pablo Fernández de Salas

Pablo is a postdoc in the SU Physics department who is using GAIA data to learn about dark matter. He likes to cook unconventional foods.