Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA
著者
和文:
Kinugasa, K.,
Torii, K.,
Hashimoto, Y.,
Tsunemi, H.,
Hayashida, K.,
Kitamoto, S.,
Kamata, Y.,
Dotani, T.,
Nagase, F.,
Sugizaki, M.,
Ueda, Y.,
河合 誠之,
Makishima, K.,
Yamauchi, S..
英文:
Kinugasa, K.,
Torii, K.,
Hashimoto, Y.,
Tsunemi, H.,
Hayashida, K.,
Kitamoto, S.,
Kamata, Y.,
Dotani, T.,
Nagase, F.,
Sugizaki, M.,
Ueda, Y.,
Kawai, N.,
Makishima, K.,
Yamauchi, S..
言語
English
掲載誌/書名
和文:
英文:
Astrophysical Journal
巻, 号, ページ
Vol. 495
pp. 435
出版年月
1998年3月
出版者
和文:
英文:
会議名称
和文:
英文:
開催地
和文:
英文:
アブストラクト
A new X-ray pulsar, AX J1820.5-1434, has been discovered during the ASCA Galactic plane survey project on April 9, at R.A. = 18h20m29.s5, decl. = -14 deg34'24" (equinox 2000.0; error radius 0.'5). A coherent pulsation was detected from the source with an apparent barycentric pulse period of 152.26 +/- 0.04 s. The mean flux, not corrected for the interstellar absorption, was 2.3 x 10-11 ergs s-1 cm-2 in the 2-10 keV energy band. The energy spectra obtained by the GIS and SIS can be fitted by a power-law model (photon index = 0.9 +/- 0.2) with a large column density of 9.8 +/- 1.7 x 1022 H atoms cm-2. These parameters indicate that the new pulsar is a highly obscured accretion-driven binary X-ray pulsar. This discovery of a faint pulsar suggests existence of many hidden pulsars in our Galaxy.
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