Galaxies

Galaxies containing quasars observed using the Hubble Space Telescope: in the top row the quasars are visible, in the bottom row the quasars' light is subtracted (Image NASA/ESA)

An article in the journal “Astrophysical Journal” describes a research conducted on quasars using the Hubble Space Telescope. These objects that are incredibly bright were observed in their formation phase, when they were in a sense teen-agers. The observations confirm the hypothesis that quasars are generated by galactic collisions that feed the supermassive black hole at their center.

The galaxy group NGC 5813 observed with the Chandra X-Ray Observatory (Image X-ray: NASA/CXC/SAO/S.Randall et al., Optical: SDSS)

An article in “The Astrophysical Journal” describes a research group of NGC 5813 made using the NASA’s Chandra X-ray Observatory. In this galaxy group, multiple eruptions originate from the supermassive black hole at the galactic center that gives its name to the group were discovered. This activity took place over about 50 million years and has changed the appearance of the group, creating various cavities, huge bubbles within the cloud of hot gas that surrounds it.

Pictures of the galaxy SDP.81. On the left a picture taken by the Hubble Space Telescope. In the middle, the galaxy as an Einsetin ring and on the left as it's seen after being processed to eliminate the gravitational lensing distorsion (Image ALMA (NRAO/ESO/NAOJ)/Y. Tamura (The University of Tokyo)/Mark Swinbank (Durham University))

ESO’s telescope ALMA (Atacama Large Millimeter / submillimeter Array) in Chile allowed to take the most detailed images ever obtained of a galaxy called HATLAS J090311.6+003906 or SDP.81. It’s about 11.4 billion light years from Earth and its light is distorted by the phenomenon called gravitational lensing. A galaxy between it and the Earth distorts its light with its huge gravity and the result is that we see an almost perfect ring, called an Einstein ring.

Artistic concept of a galaxy generatic relativistic jets with radio waves coming from its supermassive black hole (Image ESA/Hubble, L. Cal├žada (ESO))

An article published in the journal “Astrophysical Journal” describes a study that established a link between the presence of supermassive black holes that emit jets of materials to nearly the speed of light but also radio waves and galaxy mergers. An international team of astronomers led by Italian INAF researcher Marco Chiaberge used the Hubble Space Telescope in the most extensive survey of the kind ever conducted.

Artistic concept of the galaxy WISE J224607.57-052635.0 (Image NASA/JPL-Caltech)

An article published in the journal “Astrophysical Journal” describes the discovery of the brightest galaxy of the universe made using data from NASA’s space telescope WISE. Known as WISE J224607.57-052635.0, it emits light equivalent to that of over 300 trillion suns. It belongs to the ELIRG (Extremely Luminous Infrared Galaxy) class recently identified thanks to WISE.