A connected Vivaldi aperture array outrigger station for the BINGO radiotelescope

The BINGO radio telescope [1], is a new radio observatory currently being deployed in the Piancó Valley in Brazil. The main telescope within this observatory comprises a dualreflector system with a 40 m diameter primary paraboloid reflector and a 36 m diameter secondary hyperboloid reflector. This dual-reflector system will be illuminated by a multihorn feed consisting of 28 circularly polarised horn antennas operating between 980 MHz and 1260 MHz. This telescope will act as a transit telescope and is designed to explore the Universe within a redshift range of 0.127 to 0.449, focusing on utilising the neutral Hydrogen emission line to map Baryon Acoustic Oscillations (BAO) with the aim of aiding in our understanding of the nature of dark energy. In addition to this science case, BINGO has the potential to detect and localise FRBs through an interferometry system, including new auxiliary, smaller radio telescopes called outriggers. The BINGO team has plans to use Vivaldi aperture array receivers to expand and enlarge the reach of the BINGO project. Such phased arrays can be used either in the form of outriggers or alternative receivers, i.e., phased array feeds, in the main dual-reflector telescope. As outrigger stations, BINGO will be able to localise up to 10 times more FRBs than the corresponding value for single reflector antennabased outriggers.