Tetsuya Nagata

NEAR-IR POLARIMETRY AROUND 30 DORADUS: I. SEPARATION OF THE GALACTIC SOURCES

A 20 0 × 20 0 region around 30 Doradus in the Large Magellanic Cloud (LMC) is observed and analyzed in the near-infrared. We obtain polarimetry data in the J, H, and Ks bands using the SIRIUS polarimeter SIRPOL at the Infrared Survey Facility 1.4 m telescope. We measure the Stokes parameters of 2562 point-like sources to derive the degree of polarization and the polarization position angles. We discuss the statistics of the groups classified by color-magnitude diagram and proper motions of the sources, in order to separate the Galactic foreground sources from those present in the LMC. We notice that groups classified by the proper motion data show a tendency towards different polarimetric properties.

Bright Near-Infrared Sources Within 1° of the Galactic Center

A near-infrared survey has been conducted of 0.55 square degrees around the Galactic center with the 1 m telescope of Siding Spring Observatory, Australia. From the detected sources, 39 objects which are bright (K 1.4) and 11 objects slightly fainter (K~8) have been selected. Subsequently, their 1–20 µm photometry and 2–3.5 µm spectra at a resolution of λ/Δλ~150 have been obtained with the IRTF atop Mauna Kea, Hawaii.