Science with SIRIUS: Simultaneous-color InfraRed Imager for Unbiased Surveys

摘要

Some results from the near infrared camera SIRIUS are presented. SIRIUS is designed for deep and side JHKs-bands simultaneous surveys, being equipped with three science-grade HAWAII (1024 * 1024) arrays. SIRIUS is attached on a dedicated 1.4m telescope (IRSF) at Sutherland observatory in South Africa. The field of view is 7.8' * 7.8', the pixel scale is 0.45", and the limiting magnitude is J = 19.2, H = 18.6, Ks = 17.3 (S/N = 10σ and 15 minutes integration) with the 1.4m telescope. The survey of southern sky began in November 2000. SIRIUS was also used on the University of Hawaii 2.2m telescope at Mauna Kea for three times in August 2000, October 2000, and September 2001. Surveys of several northern sky areas were done. Unbiased deep survey for 6 degree square area of Large Magellanic Cloud (LMC) is one of the key programs with the 1.4m telescope. Several clusters of intermediate mass YSO candidates have been discovered so far. Monitoring surveys of several selected areas of LMC have also been carried out for detection of variable stars. The other main science programs of SIRIUS are deep imaging surveys of star forming regions in our galaxy, brown dwarf surveys in clusters, search for galaxies behind the Milky way (the Zone of Avoidance), and surveys toward the galactic center.