Galaxies

The distribution of the 36 dwarf galaxies around the Milky Way

An article published in “The Astrophysical Journal” reports the discovery of 36 dwarf galaxies that are simultaneously showing signs of the start of remarkable star-forming activity. A team of researchers examined a group of dwarf galaxies observed during the ANGST survey noting a simultaneous acceleration in star-forming activity despite the fact that they’re separated even by several million light-years. This is a phenomenon that has no explanation in current models of galaxy evolution.

The likely galaxies where the origins of fast radio bursts cataloged as FRB 190714 (top) and FRB 180924 (bottom) was located

An article to be published in “The Astrophysical Journal” reports the location of the origin of eight fast radio bursts (FRBs) detected between 2017 and 2020. A team of researchers coordinated by the University of California at Santa Cruz used the Hubble Space Telescope to accomplish this task by applying a method already used to pinpoint the origin of other cosmic phenomena such as supernovae and gamma-ray bursts. This result offers new information on an extremely energetic phenomenon such as fast radio bursts, which emit an amount of energy in a millisecond comparable to the amount the Sun emits in a year. The results of this study are compatible with the theory that links them to magnetars.

The 118 galaxy clusters of the CHEX-MATE program

An article published in the journal “Astronomy & Astrophysics” reports an overview of the CHEX-MATE (Cluster HEritage project with XMM-Newton – Mass Assembly and Thermodynamics at the Endpoint of structure formation) program’s work, which includes a study of a sample of 118 galaxy clusters carefully selected. The CHEX-MATE Collaboration observed those galaxy clusters with ESA’s XMM-Newton space telescope in a survey lasting a total of 3 million seconds.

The area around the supermassive black hole at the center of the galaxy M87 seen in the various bands of the electromagnetic spectrum during the 2017 observation campaign

An article published in “The Astrophysical Journal Letters” reports the results of multiband observations of the area around the supermassive black hole at the center of the galaxy M87. 33 members of the Multiwavelength Science Working Group of the Event Horizon Telescope (EHT) led a large team of researchers who put together data collected by the various radio telescopes that made up the EHT in the extraordinary campaign of observations which led to the historical photo published in 2019 and other data of observations in other electromagnetic bands conducted with various space and ground-based telescopes. This allows to conduct more in-depth analyzes thanks to the completeness of the emissions detected not only by the supermassive black hole but also by its jets that eject materials at very high speeds.

The 12 Einstein crosses

An article accepted for publication in “The Astrophysical Journal” reports the identification of 12 quasars whose image has been quadrupled by gravitational lenses obtaining images similar to the so-called Einstein Cross. Researchers from the Gaia Gravitational Lenses (GraL) group used data collected by ESA’s Gaia space probe and NASA’s WISE space telescope and examined them with machine learning algorithms. In this way, it was possible to recognize quasar candidates whose image was distorted by gravitational lenses leading to the identification of 12 Einstein crosses.