2001/02/28 by Jun Yokogawa, Ken’ichi Torii, Ken'ichi Torii +2 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Artificial intelligence #Astronomy #Astrophysics #Biology #Class (philosophy) #Computational Physics and Python Applications #Computer science #Identification (biology) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Physics #Pulsar #Upload #World Wide Web #astro-ph
paper · pdf · doi:10.1093/pasj/53.2.227
Appeared in PASJ. Also available at http://www-cr.scphys.kyoto-u.ac.jp/member/jun/job/
openalex publication_date 2001/04/25 · arxiv created 2001/05/23 · arxiv updated 2015/06/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract ASCA observed a new X-ray pulsar recently discovered with RXTE in the Small Magellanic Cloud, and detected coherent pulsations with a barycentric period of 2.37230 ± 0.00004~s. The position is determined within a ∼ 30′′ radius error, which is much more accurate than that reported with RXTE. Since the position error well overlaps a ∼ 20′′ radius error of the SAS-3 transient source SMC X-2, and since the probability that an unrelated source falls in the error region by chance is estimated to be less than 0.1%, we conclude that SMC X-2 is the 2.37-s pulsar. The X-ray spectrum in the 0.7–10.0 keV band can be fitted with a model of a power-law continuum plus a fluorescent line from neutral or low-ionization iron. The pulse profile has a single peak below a few keV and gradually changes to be a double-peaked structure as the energy increases; in particular, the iron line band (6.0–7.0 keV) marginally shows a double-peaked profile similar to that of the higher energy band observed with RXTE.