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Paper: Star formation studies with SIRIUS -- JHK simultaneous near-infrared camera
Volume: 289, The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I
Page: 177
Authors: Nakajima, Y.; Nagashima, C.; Nagayama, T.; Baba, D.; Kato, D.; Kurita, M.; Nagata, T.; Sato, S.; Tamura, M.; Naoi, T.; Nakaya, H.; Sugitani, K.
Abstract: Some results on a star formation study from the near infrared camera SIRIUS are presented. SIRIUS is designed for deep and wide JHKs-bands simultaneous surveys, being equipped with three near-infrared (1024 x 1024) arrays. SIRIUS is attached to a dedicated 1.4-m telescope at Sutherland Observatory in South Africa. The field of view is 7.8 arcminutes x 7.8 acrminutes, the pixel scale is 0.45 arcsecond, and the limiting magnitudes are J=19.2, H=18.6, Ks=17.3 (S/N = 10 sigma and 15 minutes' integration) with the 1.4-m telescope. SIRIUS was also used on the University of Hawaii 2.2-m telescope at Mauna Kea. Having a wide field, high sensitivity, and ability to undertake simultaneous JHKs-color observations, SIRIUS is an ideal camera for investigations of the luminosity function and spatial distribution of YSOs in clusters/clouds, very low-mass stars, and extinction of background stars due to dust in dark clouds. Many star-forming regions have been observed since the first light of SIRIUS in 2000 August. As some of the results, we have obtained the following: discovery of a shining dark cloud in Lupus, which is unaccountably bright in the K-band; star-forming structure in M16; and pre-main sequence cluster formation in the Large Magellanic Cloud.
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