The most luminous galaxy ever discovered is cannibalizing not one, not two, but at least three of its smaller neighbors, according to a new study
published today (Nov. 15) in the journal Science and coauthored by scientists from NASA's Jet Propulsion Laboratory in Pasadena, California. The material that the galaxy is stealing from its neighbors is likely contributing to its uber-brightness, the study shows.
Discovered by NASA's space-based Wide-field Infrared Survey Explorer (WISE) in 2015, the galaxy, called
WISE J224607.55-052634.9, is by no means the largest or most massive galaxy we know of, but it radiates at 350 trillion times the luminosity of the Sun. If all galaxies were positioned an equal distance from us, WISE J224607.55-052634.9 (or W2246-0526 for short) would be the brightest.
New observations using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile reveal distinct trails of dust being pulled from three smaller galaxies into W2246-0526. The trails contain about as much material as the smaller galaxies themselves, and it's unclear whether those galaxies will escape their current fate or will be completely consumed by their luminous neighbor.
