June 2021

The CHIME radio telescope (Photo courtesy CHIME)

At the 238th meeting of the American Astronomical Society (AAS), held in recent days, Researchers presented the results of fast radio bursts detections made using the CHIME radio telescope between July 25, 2018, and July 1, 2019, the first year of research with this instrument. Researchers from the CHIME collaboration detected 535 fast radio bursts including 61 bursts from 18 known repeating sources. The catalog presented on this occasion considerably expands the number of known fast radio bursts offering a lot of new information on these still mysterious phenomena. The differences between the characteristics of single and repeating bursts indicate even more that there are at least two mechanisms that produce them.

Some of the galaxies observed in the PHANGS project

An article accepted for publication in the “Astrophysical Journal Supplement” series presents the PHANGS-ALMA survey with the mapping of about 100,000 stellar nurseries in 90 galaxies in the nearby universe. A team of researchers used the ALMA radio telescope to map molecular clouds of gas and dust in which conditions are suitable for the formation of new stars. The results of this survey were presented at the 238th meeting of the American Astronomical Society held in recent days.

The radio galaxy CGCG 044-046 in an elaboration showing the MeerKAT detections in white on an optical image of the Digital Sky Survey 2

An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports a review of radio galaxies discovered 47 years ago using two of the most powerful radio telescopes currently in service. A team of researchers used the uGMRT and MeerKAT radio telescopes to conduct the new observations. The first author is astronomer Bernie Fanaroff, who began the study of radio galaxies and classified them together with astrophysicist Julia Riley.

The jet from protostar Cep A HW2 seen by the VLA (Image Carrasco-Gonzalez et al., Bill Saxton, NRAO/AUI/NSF)

An article accepted for publication in the “Astrophysical Journal Letters” reports a study on the massive protostar Cep A HW2 and in particular on the jets of materials ejected from it. A team of researchers used the VLA to capture the best images so far of a protostar that, at the end of its formation, will likely be about 10 times more massive than the Sun. The details of the ejected jets indicate that they have an origin close to the star that has a wide angle and then tapers as the distance increases, a process called collimation. In lower-mass protostars, the collimation of the jets occurs much closer to their surface. Understanding the reason for this difference will help to better understand star formation processes.