Miwa Goto

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We report current status of the Infrared Camera and Spectrograph (IRCS) for the Subaru Telescope. IRCS is a Subaru facility instrument optimized for high-resolution images with adaptive optics (AO) and tip-tilt at 105m. IRCS consists of two parts: one is a cross-dispersed spectrograph providing mid to high spectral resolution (R=5,000020,000), the other is(More)
Type Ia supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe. Among the most important unsolved questions about supernovae are how the explosion actually proceeds and whether accretion(More)
053 The circumstellar disks of gas and dust around newly formed stars are believed to be the birthplaces of giant planets. In some protoplanetary disks, evidence of gaps or inner cavities has been revealed through analysis of the infrared spectral energy distribution (SED; e.g., [1]) or interferometry at infrared (e.g., [2]) or millimeter wavelengths (e.g.,(More)
We present high-resolution (R = 20000) spectroscopy of H + 3 absorption toward the luminous Galactic center sources GCS 3-2 and GC IRS 3. With the efficient wavelength coverage afforded by Subaru IRCS, six absorption lines of H + 3 have been detected in each source from 3.5 to 4.0 µm, three of which are new. In particular the 3.543 µm absorption line of the(More)
Infrared absorption lines of H + 3 , including the metastable R(3,3) l line, have been observed toward eight bright infrared sources associated with hot and massive stars located in and between the Galactic Center Cluster and the Quintuplet Cluster 30 pc to the east. The absorption lines with high velocity dispersion arise in the Galaxy's Central Molecular(More)
Observational and theoretical evidence suggests that high-energy Galactic cosmic rays are primarily accelerated by supernova remnants. If also true for low-energy cosmic rays, the ionization rate near a supernova remnant should be higher than in the general Galactic interstellar medium (ISM). We have searched for H + 3 absorption features in six sight lines(More)
HiCIAO is a high contrast instrument which works with a 188 element adaptive optics system (AO188) for the Subaru Telescope. The instrument is specifically designed for extrasolar planet search and studies of proto-planetary or debris disks. A coronagraph technique and some differential observing modes implemented in HiCIAO extract faint objects from the(More)
Cassiopeia A is the youngest supernova remnant known in the Milky Way and a unique laboratory for supernova physics. We present an optical spectrum of the Cassiopeia A supernova near maximum brightness, obtained from observations of a scattered light echo more than three centuries after the direct light of the explosion swept past Earth. The spectrum shows(More)
We present ground-based high-resolution (∼0. ′′ 3) imaging of AFGL 2688 at L ′ (3.8 µm) and M ′ (4.7 µm). A wealth of structure in the central region is revealed due to less extinction in the thermal infrared. A clear border in the southern lobe at L ′ corresponds to the edge of the heavily obscured region in visible, indicating there is a dense material(More)