Dark energy tagged posts

Image around SN 2012dn obtained by the Kanata Telescope at Higashi-Hiroshima Observatory. SN 2012dn is seen near the center of this figure. The host galaxy ESO 462-G016 is seen on the left side of SN 2012dn. The distance to this galaxy is known to be 130 mega-light-years. Because the supernova is a point source, the expansion cannot be measured, but the evolutions of the brightness and color are obtained. Credit: Higashi-Hiroshima Observatory

Using Optical and Infrared Synergetic Telescopes for Education and Research (OISTER), researchers discovered an anomalously strong infrared emission from ‘the extraordinary supernova’ SN 2012dn, which has never been observed in other Type Ia supernovae to date...

Artist’s illustration of a gamma-ray burst. Energy from the explosion is beamed into two narrow, oppositely directed jets. Credit: NASA/Swift/Mary Pat Hrybyk-Keith and John Jones

Sometimes when a star collapses into a supernova, it releases gamma-ray bursts GRBs which last just a few seconds, but during that time they can release as much energy as the Sun will produce in its entire lifetime. They are so intense that, if pointed at the Earth from even the most distant edge of our galaxy, they could easily cause a mass extinction. It’s thought that a gamma-ray burst may have caused the Ordovician extinction around 440 million years ago, which wiped out 85% of all species at the time.

Clearly, the farther away a planet is from gamma-ray bursts, the better its chances of harboring advanced for...

The gravitational waves generated during the formation of structures in the universe are shown. The structures (distribution of masses) are shown as bright dots, gravitational waves by ellipses. The size of the ellipse is proportional to the amplitude of the wave and its orientation represents its polarization. CREDIT © Ruth Durrer, UNIGE

The Universe is constantly expanding. It changes, creating new structures that merge. But how does our Universe evolve? Physicists at the University of Geneva (UNIGE), Switzerland, have developed a new code of numerical simulations that offers a glimpse of the complex process of the formation of structures in the Universe...

The infrared image on the left shows the field of view of the Parkes radio telescope with the area where the signal came from marked in cyan. On the right are successive zoom-ins on that area. At the bottom right is the Subaru optical image of the FRB galaxy, with the superimposed elliptical regions showing the location of the fading 6-day afterglow seen with ATCA. Credit: © D. Kaplan (UWM), E. F. Keane (SKAO)

An international research team including Max Planck Institute for Radio Astronomy in Bonn, Germany used a radio and optical telescopes to identify the precise location of a fast radio burst (FRB) in a distant galaxy, allowing them to conduct a unique census of the Universe’s matter content.They confirmed current cosmological models of the distribution of matter in the Universe.

On A...