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8 results on '"Ogasaka Y"'

5. ASCA detection of faint sources in the Lockman Hole and its comparison with ROSAT sources

Author

Miyaji, T., Hasinger, G., Ishisaki, Y., Ogasaka, Y., Ueda, Yoshihiro, Yamashita, Akiko, Takahashi, Tadayuki, Inoue, Hajime, and Makishima, K.

Subjects
Physics, Atmospheric Science, Geophysics, Space and Planetary Science, ROSAT, Aerospace Engineering, General Earth and Planetary Sciences, Astronomy, Astronomy and Astrophysics, Astrophysics, Counting rate
Abstract

We conducted the ASCA observations of the Lockman Hole, aiming to detect faint sources and to determine the CXB origin. We have detected 18 discrete sources in 5σ significance from 0.7-2/2–7/0.7-7 keV band images obtained with ASCA. Correlated with the ROSAT catalog, 13 sources out of 16 (2 are out of bounds) have counterparts in the catalog, and 11 are identified as AGNs. We further determined the ASCA counting rate for all cataloged ROSAT sources utilizing the source position in the ROSAT catalog. Correlation between ROSAT counts (0.5-2 keV) and ASCA counts (2–10 keV) shows a large scatter. This suggests time variability of sources and/or the various degree of absorption / soft-excess on the spectra of AGNs which contribute the CXB.

Published
2000

6. Results from the ASCA Large Sky Survey — Nature of faint X-ray sources and the implications for the origin of the CXB

Author

Hasinger, G., Voges, W., Ueda, Yoshihiro, Akiyama, M., Inoue, Hajime, Ishisaki, Y., Makishima, K., Ogasaka, Y., Ohta, K., Sakano, M., Takahashi, Tadayuki, Tsuru, T., and Yamada, T.

Subjects
Physics, Atmospheric Science, Range (particle radiation), Photon, media_common.quotation_subject, Spectral properties, X-ray, Aerospace Engineering, Astronomy, Flux, Astronomy and Astrophysics, Astrophysics, Spectral line, Geophysics, Space and Planetary Science, Sky, General Earth and Planetary Sciences, Absorption (electromagnetic radiation), media_common
Abstract

著者人数：13名, 資料番号: SA1002260000

Published
2000

7. Development of thin-foil substrates for a large X-ray telescope

Author

Awaki, H., primary, Heike, K., additional, Misao, Y., additional, Tawara, Y., additional, Ogasaka, Y., additional, Kunieda, H., additional, Ohmori, H., additional, Lin, W., additional, Moriyasu, S., additional, Ueno, Y., additional, Morita, S., additional, Katahira, K., additional, Liu, C., additional, Honda, H., additional, and Shioya, S., additional

Published
2004
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