Terahertz generation in an actively controlled femtosecond enhancement cavity (2008)
Theuer, M., Molter, D., Maki, K., Otani, C., L'huillier, J.A., Beigang, R.
We report on terahertz generation by Cherenkov-type optical rectification in lithium niobate using an actively controlled femtosecond pumped enhancement cavity. In this way a much higher pump power...
Terahertz sensing method for protein detection using a thin metallic mesh (2007)
Yoshida, H., Ogawa, Y., Kawai, Y., Hayashi, S., Hayashi, A., Otani, C., ...
A label-free biological sensor, which is based on the resonant transmission phenomenon of a thin metallic mesh, is proposed in the terahertz wave region. By using this sensor, we demonstrate the...
Longitudinal magnetic field effect on the electrical breakdown in low pressure gases (2006)
G. Petraconi, H. S. Maciel, R. S. Pessoa, G. Murakami, M. Massi, C. Otani, ...
Longitudinal magnetic field effect on the electrical breakdown in low pressure gases
Theuer, M., Torosyan, G., Rau, C., Beigang, R., Maki, K., Otani, C., ...
We report on the generation of broadband terahertz (THz) pulses using Cherenkov-type generation in magnesium oxide-doped lithium niobate (MgO:LN). The efficiency of the output coupling process of THz...
Martín, I. M., Pugacheva, G. I., Viegas, M. F., Ferreira, D. V., Otani, C., Gusev, A. A.
Es posible que, países meridionales del hemisferio, desarrollen juntos un programa científico dirigido a estudiar las propiedades y el comportamiento de la ionosfera, basado en la radiación de...
Longitudinal magnetic field effect on the electrical breakdown in low pressure gases (2004)
Petraconi,G., Maciel,H. S., Pessoa,R. S., Murakami,G., Massi,M., Otani,C., ...
The electrical breakdown has been investigated for low-pressure argon and nitrogen discharges under the influence of an external longitudinal magnetic field. Plane-parallel aluminum electrodes (5 cm...
Yoshida, A., Namiki, M., Yonetoku, D., Murakami, T., Otani, C., Kawai, N., ...
A gamma-ray burst of 28 August 1997 was localized by the All-Sky Monitor on the Rossi XTE satellite and its coordinates were promptly disseminated. An ASCA followup started 1.17 days after the burst...
RE J2248-511 - Not all variable, ultrasoft, X-ray AGN have narrow Balmer lines (2001)
Breeveld, A. A., Puchnarewicz, E. M., Otani, C.
We present ASCA data on RE J2248-511, extending existing optical and soft X-ray coverage to 10 keV, and monitoring the soft component. These data show that, despite a very strong ultrasoft X-ray...
Broad Band X-Ray Observations of the Narrow Line X-Ray Galaxy NGC 5506 (1999)
Wang, T. G., Mihara, T., Otani, C., Matsuoka, M., Awaki, H.
We present a detailed analysis of broad band X-ray data of the Seyfert 2 galaxy NGC5506. 2-10 keV band are detected during a 1-day ASCA observation, while no significant change in the 2-10 keV...
Otani, C., Mihara, T., Cappi, M., Matsuoka, M.
ASCA observations of the Seyfert 2 galaxy NGC 7582 revealed it was highly variable on the timescale of $\sim2\times10^4$ s in the hard X-ray (2-10 keV) band, while the soft X-ray (0.5-2 keV) flux...
The Complex X-ray Spectrum of 3C 273: ASCA Observations (1998)
Cappi, M., Matsuoka, M., Otani, C., Leighly, K. M.
shortened) Results obtained from 9 X-ray observations of 3C 273 performed by ASCA are presented (for a total exposure time of about 160 000 s). The analysis and interpretation of the results is...
Fading X-ray afterglows from GRB's observed with ASCA (1998)
Murakami, T., Ueda, Y., Shibata, R., Fujimoto, R., Ishida, M., Udo, S., ...
BeppoSAX observation of NGC 7674: a new reflection-dominated Seyfert 2 galaxy (1997)
Malaguti, G., Palumbo, G. G. C., Cappi, M., Comastri, A., Otani, C., Matsuoka, M., ...
The Seyfert 2 galaxy NGC 7674 has been observed within the BeppoSAX Core Programme with the onboard narrow field instruments between 0.1 and 100 keV. The broad-band spectrum shows four most relevant...
Urry, C. Megan, Treves, A., Maraschi, L., Marshall, H., Kii, T., Madejski, G., ...
In May 1994 the BL Lac object PKS 2155-304 was observed continuously for ~10 d with IUE and EUVE and for 2 d with ASCA, as well as with ROSAT and with ground- based radio, IR, and optical telescopes....
The ASCA X-ray spectrum of the powerful radio galaxy 3C109 (1997)
Allen, S. W., Fabian, A. C., Idesawa, E., Inoue, H., Kii, T., Otani, C.
We report the results from an ASCA X-ray observation of the powerful Broad Line Radio Galaxy, 3C109. The ASCA spectra confirm our earlier ROSAT detection of intrinsic X-ray absorption associated with...
The variable iron K emission line in MCG-6-30-15 (1996)
Iwasawa, K., Fabian, A. C., Reynolds, C. S., Nandra, K., Otani, C., Inoue, H., ...
We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG--6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and...
ASCA Observations of the Composite Warm Absorber in NGC 3516 (1996)
Kriss, G. A., Krolik, J. H., Otani, C., Espey, B. R., Turner, T. J., Kii, T., ...
We obtained X-ray spectra of the Seyfert 1 galaxy NGC~3516 in March 1995 using ASCA. Simultaneous far-UV observations were obtained with HUT on the Astro-2 shuttle mission. The ASCA spectrum shows a...
The variable OVIII Warm Absorber in MCG-6-30-15 (1995)
Otani, C., Kii, T., Reynolds, C. S., Fabian, A. C., Iwasawa, K., Hayashida, K., ...
We present the results of a 4 day ASCA observation of the Seyfert galaxy MCG-6-30-15, focussing on the nature of the X-ray absorption by the warm absorber, characterizd by the K-edges of the...
Warm absorber, reflection and Fe K line in the X-ray spectrum of IC 4329A (1995)
Cappi, M., Mihara, T., Matsuoka, M., Hayashida, K., Weaver, K. A., Otani, C.
Results from the X-ray spectral analysis of the ASCA PV phase observation of the Seyfert 1 galaxy IC 4329A are presented. We find that the 0.4 - 10 keV spectrum of IC 4329A is best described by the...
On broad iron K-alpha lines in Seyfert 1 galaxies (1995)
Fabian, A. C., Nandra, K., Reynolds, C. S., Brandt, W. N., Otani, C., Tanaka, Y., ...
The X-ray spectrum obtained by Tanaka et al from a long observation of the active galaxy MCG$-6-30-15$ shows a broad iron K$\alpha$ line skewed to low energies. The simplest interpretation of the...