Galaxies

The galaxy cluster around HDF850.1

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An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports the discovery of the most densely populated galaxy cluster in formation in the early universe. A team of researchers used the OSIRIS instrument of the Gran Telescopio Canarias (GTC) to observe an area around the galaxy HDF850.1, already well known because it’s been the focus of various researches, discovering other protogalaxies. We see those galaxies as they were about 12.5 billion years ago, when the universe was very young, so this is a great discovery to study the birth and evolution of the largest structures in the universe.

A portion of the radio map of the sky in the MIGHTEE survey with the two giant radio galaxies in the insets

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An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports the discovery of two giant radio galaxies in a small portion of the sky, a discovery in theory very unlikely. A team of researchers led by Jacinta Delhaize of the University of Cape Town, South Africa, used data collected during the MIGHTEE survey conducted with the MeerKAT radio telescope. Giant radio galaxies are considered very rare, but are perhaps much more common than expected, a possibility that could have an impact on studying the formation and evolution of galaxies.

The galaxy ESO 253-G003 seen by the MUSE instrument (Michael Tucker (University of Hawai’i) and the AMUSING survey)

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An article under review for publication reports a study on the galaxy ESO 253-G003 that classifies it among the ones with an active galactic nucleus that is consuming a star orbiting the central supermassive black hole. A team of researchers led by Anna Payne of the University of Hawaii used observations conducted with various telescopes to study the phenomenon, cataloged as ASASSN-14ko, detecting a series of regular cosmic outbursts that were interpreted as energy emissions linked to the passage of a star too close to the black hole, which destroys a part of it at each orbit.

Artist's representation of the galaxy ID2299 (Image ESO/M. Kornmesser)

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An article published in the journal “Nature Astronomy” reports a study on a massive galaxy in the distant universe in which a galaxy merger appears to have inhibited star formation. A team of researchers led by Annagrazia Puglisi of Durham University’s Center for Extragalaxy Astronomy used the ALMA radio telescope to examine the galaxy cataloged as ID2299 and found star formation activity in its central regions while a huge amount of gas was ejected removing the possibility of forming new stars.

6 galaxy merger systems: at the top are the galaxies NGC 3256, NGC 1614, and NGC 4194; at the bottom are the galaxies NGC 3690, NGC 6052, and NGC 34.

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An article published in the journal “Monthly Notices of the Royal Astronomical Society” reports a research on the star formation rate in galaxy merger systems. A team of researchers used observations carried out with the Hubble Space Telescope within the Hubble imaging Probe of Extreme Environments and Clusters (HiPEEC) survey to study the influence of a galaxy merger on star formation, particularly of entire star clusters. ESA has published a composition of six such systems.