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X-Ray Expanding Features Associated with a Moreton Wave

Shibata, Kazunari; Morimoto, Taro; Kurokawa, Hiroki +3 more

XMM-Newton Observations of G32.45+0.1 and G38.55+0.0: Diffuse Hard X-Ray Sources Found by the ASCA Galactic Plane Survey

Ueno, Masaru; Yamaguchi, Hiroya; Koyama, Katsuji +2 more

We report on XMM-Newton observations of G32.45+0.1 and G38.55+0.0. These were discovered as diffuse hard X-ray sources by the ASCA Galactic Plane Survey, but the limited spatial resolution of ASCA could not conclude whether these are truly diffuse or a group of unresolved point-sources. XMM-Newton, with higher spatial resolution than ASCA, confirm…

Low-Ionization Emission-Line Regions around the Nucleus of the Seyfert Galaxy NGC 1068

Hattori, Takashi; Ishigaki, Tsuyoshi; Sugai, Hajime +6 more

We present the results of tridimensional spectrophotometric observations of the central region of the Seyfert galaxy NGC 1068 obtained by using Kyoto tridimensional spectrograph I. A brief description of the instrument is presented. We have found the existence of low-ionized gas extending out of the ionization cone. It is characterized by higher (…

Virgo High-Resolution CO Survey: IV. Spiral-Driven Gas Dynamics in the Non-Barred Seyfert Galaxy NGC 4501

Kohno, Kotaro; Koda, Jin; Onodera, Sachiko +1 more

We report on high-resolution interferometer observations of the ¹²CO(J = 1-0) emission in the central 5kpc region of the Seyfert 2 galaxy NGC 4501. The observations were made using the Nobeyama Millimeter Array during a long-term CO line survey of Virgo spirals. The major features are: (1) a nuclear concentration with a radius of r ∼ 5'…

Computation of the Adiabatic Eigenmodes of Stars Using the Riccati Method

Takata, Masao; Löffler, Wolfgang

In stellar oscillation problems, it is often necessary to compute a large number of stellar eigenmodes with wildly varying radial orders and angular degrees. Conventionally the relaxation method is used for this purpose. This method is, however, fraught with several numerical issues, which make it cumbersome and tedious to write the corresponding …

Discovery of a Peculiar Pulsar in the Small Magellanic Cloud

Ueno, Masaru; Yamaguchi, Hiroya; Takagi, Shin-Ichiro +2 more

We report on a peculiar X-ray binary pulsar, IKT 1 = RX J0047.3 - 7312, observed with XMM-Newton in 2000 October. The X-ray spectrum is described by a two-component spectrum. The hard component has a broken power-law with respective photon indices of 0.2 and 1.8, below and above the break energy at 5.8keV. The soft component can be modeled by a bl…

Discovery of Interacting Molecular Gas toward the TeV Gamma-Ray Peak of the SNR G 347.3--0.5

Takahashi, Tadayuki; Uchiyama, Yasunobu; Fukui, Yasuo +10 more

Supernova remnants ( = SNR) are suggested to be sites of cosmic-ray acceleration. In particular, it has been an issue of keen interest whether cosmic ray protons are being accelerated in a SNR which emits TeV γ-rays. A crucial observational test for this is to find dense molecular gas towards the SNR, because such molecular gas can best verify the…

Dusty ERO Search behind Two Massive Clusters

Ohyama, Youichi; Kawabata, Koji S.; Yoshida, Michitoshi +15 more

We performed deep K'-band imaging observations of 2 massive clusters, MS 0451.6 - 0305 at z = 0.55 and MS 0440.5 + 0204 at z = 0.19, for searching counterparts of the faint sub-mm sources behind these clusters, which would provide one of the deepest extremely red object (ERO) samples. Comparing our near-infrared images with optical images taken by…

Eruptive and Quasi-Eruptive Disappearing Solar Filaments and Their Relationship with Coronal Activities

Morimoto, Taro; Kurokawa, Hiroki

By measuring the 3-D velocity fields of 35 disappearing filaments (Disparition Brusques: DBs) on the solar disk, we studied the causal relationship between the motions of Hα DBs and the associated coronal phenomena. Using the derived 3-D velocity fields of the DBs, we developed a method to judge whether a DB is ejected into interplanetary space or…

The Virgo High-Resolution CO Survey: III. NGC 4254

Nakanishi, Hiroyuki; Koda, Jin; Sofue, Yoshiaki +1 more

We present high-angular-resolution (1''.5 - 5'') interferometer observations of the ¹²CO (J = 1--0) line emission in the central region of the SA(s)c galaxy NGC 4254 (M 99). The observations were obtained using the Nobeyama Millimeter-wave Array (NMA) during the course of a long-term CO-line survey of Virgo spirals. We present the spect…