Ryoko Sumiya

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31.30; H, 5.22; N, 36.52. Found: C, 31.34; H, 5.25; N, 36.70. Low-resolution mass spectral analysis showed the expected molecular ion at m / e 345. The infrared spectrum contained a cyano stretching peak at 2180 cm-'. The 31P NMR spectrum consisted of a singlet at -7.8 ppm. Crystals suitable for X-ray analysis were grown by slow evaporation of a solution of(More)
We report the discovery of the scattered emission from a hidden broad-line region (BLR) in a Seyfert 2 galaxy, Mrk 573, based on our recent spectropolarimetric observation performed at the Subaru Telescope. This object has been regarded as a type 2 AGN without a hidden BLR by the previous observations. However, our high quality spectrum of the polarized(More)
In order to search for high-redshift galaxies beyond z = 6.6 in the Subaru Deep Field, we have investigated NB921-dropout galaxies where NB921 is the narrowband filter centered at 919.6 nm with FWHM of 13.2 nm for the Suprime-Cam on the Subaru Telescope. There are no secure NB921-dropout candidates brighter than z =25.5. Based on this result, we discuss the(More)
We present the results of a survey for Lyα emitters at z ≈ 5.8 using a new intermediate-band filter centered at λc ≈ 8275 Å with ∆λFWHM ≈ 340 Å (i.e., the spectroscopic resolution is R ≈ 23) with a combination with a traditional narrow-band centered at λc ≈ 8150 Å with ∆λFWHM ≈ 120 Å (R ≈ 68). Our observations were made with use of the Subaru Prime Focus(More)
We propose a new method to search for high-redshift galaxies that is based on an intermediate-band dropout technique rather than the usual broad-band dropout one. In this method, we use an intermediate-band filter whose central wavelength is longer than 7000 Å. This new method makes it possible to distinguish both very late-type stars such as L and T dwarfs(More)
We discuss observational properties of strong emission-line galaxies at low redshift found by our deep imaging survey for high-redshift Lyα emitters. In our surveys, we used the narrowband filter, NB816 (λcenter = 8150 Å with FWHM = 120 Å), and the intermediate-band filter, IA827 (λcenter = 8270 Å with FWHM = 340 Å). In this survey, 62 NB816-excess (> 0.9(More)
In order to search for high-redshift galaxies around z ∼ 6 in the Subaru Deep Field, we have investigated NB816-dropout galaxies where NB816 is the narrowband filter centered at 815nm with FWHM of 12.5 nm for the Suprime-Cam on the Subaru Telescope. Since the NB816 imaging is so deep we can detect 10 well-defined NB816dropout galaxies that we identify to(More)
We report on the result of our high quality spectropolarimetric observation for the narrow-line region in a nearby Seyfert 2 galaxy, Mrk 573, by the Subaru Telescope. The polarized flux spectrum of Mrk 573 shows not only prominent scattered broad Hα emission but also various narrow forbidden emission lines. We find that the measured polarization degree of(More)
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