Discovery of the faint X-ray pulsar AX J1820.5-1434 with ASCA

被引：35

作者：

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

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Osaka 560, Japan

[2] Japan Sci & Technol Corp, CREST, Osaka, Japan

[3] Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 46401, Japan

[4] Inst Space & Astronaut Sci, Kanagawa 229, Japan

[5] Inst Phys & Chem Res, Wako, Saitama 35101, Japan

[6] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 113, Japan

[7] Iwate Univ, Fac Humanities & Social Sci, Morioka, Iwate 020, Japan

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 495卷 / 01期

关键词：

binaries; general; pulsars; individual (AX J1820.5-1434); X-rays; stars;

D O I：

10.1086/305291

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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. = 18(h)20(m)29.(s)5, decl. = -14 degrees 34'24 " (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 10(22) 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.

引用

页码：435 / 439

页数：5

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