Cosmology

The galaxy UGC 9391 seen by the Hubble Space Telescope. Cepheid variable are in red circles, a type Ia supernova is marked by a blue cross (Image NASA, ESA, and A. Riess (STScI/JHU))

An article accepted for publication in “The Astrophysical Journal” describes a research based on observations made with the Hubble Space Telescope that suggests that the universe is expanding at a faster rate than expected. A team of astronomers led by Nobel laureate Adam Riess measured the distance of stars in nineteen galaxies with the best accuracy ever achieved to obtain this surprising result.

The supernova G1.9+0.3 (Image NASA/CXC/CfA/S. Chakraborti et al.)

An article published in “Astrophysical Journal” describes the analysis of the supernova remnant G1.9+0.3, the youngest observed in the Milky Way. A team of astronomers from Harvard University used data collected by NASA’s Chandra space telescope and the VLA radio telescope to find evidence that it’s an explosion triggered by the merger of two white dwarfs, what is called a Type Ia supernova.

Map of voids and galaxy superclusters around the Milky Way (Image Richard Powell)

An article published in the journal “Astronomy & Astrophysics” describes the discovery of what was called the BOSS Great Wall, a supercluster more than a billion light years long and between 4.5 and 6.4 billion light years from the Earth. With an estimated mass of 10,000 times that of the Milky Way, it’s the largest supercluster discovered so far.

A portion of space simulated by the Illustris project showing the distribution of dark matter (Image courtesy Markus Haider / Illustris collaboration)

An article published in the journal “Monthly Notices of the Royal Astronomical Society” describes a research on the distribution of matter in the universe. According to the results 20% of ordinary matter is contained in the so-called cosmic voids and galaxies are only 1/500th of the volume of the universe. A team led by Dr Markus Haider of the Institute of Astro and Particle Physics at the University of Innsbruck in Austria, has used simulations of the Illustris project to reach these conclusions.

Field of view of the Parkes radio telescope. On the right two zoom-ins and at the bottom an image from the Subaru telescope (Image courtesy D. Kaplan (UWM), E. F. Keane (SKAO))

An article published in the journal “Nature” describes research that has uncovered the place of origin of a Fast Radio Burst (FRB). These radio signals that last only a few milliseconds are picked up with no phenomenon that might warn about its arrival. An international team of astronomers used observations made by optical and radio telescopes to trace the origin of this phenomenon.