Search Publications
Subaru First-Light Deep Photometry of Galaxies in A 851 Field
Kobayashi, Naoto; Terada, Hiroshi; Usuda, Tomonori +96 more
We report on the results of optical and near-infrared photometry of the cluster of galaxies A 851 (=CL 0939+4713) carried out as one of the first-light observations of the 8.2 m Subaru telescope on Mauna Kea. Images as sharp as 0.''3 FWHM in K' and 0.''45 in R were obtained in these observations. The 3 sigma limiting magnitudes for points sources …
Kinematics of the Galaxy from Hipparcos Proper Motions
Zhu, Zi
From Hipparcos proper motions, we have analysed the local kinematics of the Milky Way from young O-B5 stars, classical Cepheids, and the late-type K-M giants. The components of solar motion along the direction pointing to the galactic center from the Sun u_0 and along the direction pointing to the north galactic pole w_0 are approximately 10 km s<…
Tridimensional Spectrophotometric Study of the Extended Emission-Line Regions of the Infrared-Luminous Merger Markarian 266
Yoshida, Michitoshi; Hattori, Takashi; Ishigaki, Tsuyoshi +6 more
An extensive tridimensional spectrophotometric study of the extended emission-line regions of Mrk 266, a merging system of a Seyfert galaxy and a LINER, was performed. We obtained its narrow-band images of Hα , [O III] lambda 5007, and [S II] lambda lambda 6716, 6731 using an imaging Fabry-Perot interferometer with a tunable filter and area spectr…
Some Features of Manifestations of Coronal Holes in Microwave Emission
Grechnev, Victor V.; Krissinel, Boris B.; Kuznetsova, Svetlana M. +4 more
Using observational data from the SSRT, we have investigated the behavior of four mid- and low-latitude coronal holes. The coronal holes under study appeared as regions of decreased emission intensity relative to the quiet Sun level totally or partially coincident with holes in EUV emission. Difference in the electron density and temperature in di…
High-Resolution Near-Infrared Imaging of the Powerful Radio Galaxy 3C 324 at z = 1.21 with the Subaru Telescope
Terada, Hiroshi; Usuda, Tomonori; Imanishi, Masatoshi +18 more
We have obtained high-resolution K'-band images of the powerful z=1.206 radio galaxy 3C 324 with the Subaru telescope under seeing conditions of 0.''3-0.''4. We clearly resolved the galaxy and directly compared it to the optical images obtained with the Hubble Space Telescope. The host galaxy of 3C 324 is revealed …
ISO Observations of the Planetary Nebula Lindsay 305 in the Small Magellanic Cloud
Tanabé, Toshihiko; Sauvage, Marc; Vansevičius, Vladas +1 more
We present ISO (Infrared Space Observatory) observations of the planetary nebula Lindsay 305 (L 305) in the Small Magellanic Cloud. L 305 is very prominent in the ISOCAM frames at 6.75 and 11.5 mu m, although it is under the detection limit at 4.5 mu m. The obtained spectral energy distribution shows a strong mid-IR excess, which, depending on the…
Color and Morphology of Galaxies in the Region of the 3C 324 Clusters at z ~ 1.2
Yamada, Toru; Kajisawa, Masaru
We investigated the color and morphology of optically selected galaxies in the region of clusters at z ~ 1.2 near to the radio galaxy 3C 324 using archived data taken with the Hubble Space Telescope. The faint galaxies selected at the HST F702W band that contribute to the surface-density excess of the region have wide ranges of color, size, and mo…
Quasar Lensing Caused by Clusters of Galaxies in Various Cosmological Models
Tomita, Kenji
About 33% of the observed lensed quasars have separation angles larger than 3''. To theoretically reproduce this observational fact, we investigate the statistics of quasar lensing due to clusters of galaxies, in various cosmological models including a super-horizon-scale inhomogeneous model. By calculating the expected number of lensed quasars an…
The Be Star Gamma Cassiopeiae: X-Ray, Far-UV, and Optical Observations in Early 1989
Murakami, Toshio; Kawai, Nobuyuki; Matsuoka, Masaru +12 more
The state of gamma Cas in early 1989 is presented as the result of joint observations in the X-ray, far-UV, and optical regions. Particular attention has been paid to short- and long-term variations within these spectral ranges. In X-ray observations with the Ginga satellite we have found no specific periodic variabilities in the 64 to 13,000 s ra…
Spectroscopic Determinations of Stellar Parameters and Photospheric Helium Abundances for Alpha Cygni and Beta Orionis
Takeda, Yoichi
A detailed non-LTE analysis of neutral helium lines was carried out for two early A--late B supergiants alpha Cyg and beta Ori in order to obtain information concerning the abundance of helium in their photospheres, the key element for studying evolution-induced mixing in the envelope of such massive stars. To minimize the systematic errors caused…