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Title
Japanese: 
English:Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA 
Author
Japanese: 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..  
English: 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..  
Language English 
Journal/Book name
Japanese: 
English:Astrophysical Journal 
Volume, Number, Page Vol. 495        pp. 435
Published date Mar. 1998 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract 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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