Astronomers discover ultra-luminous infrared galaxy lurking behind quasar

An international team of astronomers has used the Atacama Large Millimeter/submillimeter Array (ALMA) to observe a well-known quasar known as the Cloverleaf. As part of the observations, they serendipitously discovered a new ultra-luminous infrared galaxy. The finding was reported September 30 in the Monthly Notices of the Royal Astronomical Society.