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publication
Discovery of the Faint X-Ray Pulsar AX J1820.5-1434 with ASCA

K. Kinugasa, K. Torii, Y. Hashimoto, H. Tsunemi, K. Hayashida, S. Kitamoto, Y. Kamata, T. Dotani, F. Nagase, M. Sugizaki, Y. Ueda, N. Kawai, K. Makishima, S. Yamauchi

Journal: Astrophysical Journal v.495, p.435

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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