ASCA Discovery of a Be X-Ray Pulsar in the SMC: AX J0051–733

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ASCA Discovery of a Be X - Ray Pulsar in the SMC : AX J 0051 − 733

ASCA observed the central region of the Small Magellanic Cloud, and found a hard X-ray source, AX J0051−733, at the position of the ROSAT source RX J0050.8−7316, which has an optical counterpart of a Be star. Coherent X-ray pulsations of 323.1 ± 0.3 s were discovered from AX J0051−733. The pulse profile shows several sub-peaks in the soft (0.7–2.0 keV) X-ray band, but becomes nearly sinusoidal ...

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The discovery of coherent pulsations with ASCA from an X-ray source, AX J0049.5−7323, is reported. The barycentric period was determined to be 755.5± 0.6 s, which is the longest among X-ray pulsators in the SMC. The X-ray spectrum has been found to be unchanged through ASCA observations, with a photon index of ∼ 0.8 and a luminosity of ∼ 5× 10 erg s (0.7–10 keV). Archival data of the Einstein a...

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The results from three ASCA observations of AX J0051.6−7311 = RX J0051.9−7311 are reported. Coherent pulsations with a barycentric period of 172.40± 0.03 s were discovered in the third observation, with an exceptionally long exposure time of ∼ 177 ks. The X-ray spectrum was found to remain unchanged through these observations, with a photon index of ∼ 0.9. Energy-resolved pulse profiles in the ...

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We report on the discovery and analysis of an X-ray pulsar, AX J0058−7203, in the Small Magellanic Cloud. This pulsar exhibits coherent pulsations at P = 280.3 s with a double-peak structure. The X-ray spectrum is well fitted with a simple power-law model of photon index Γ ∼ 0.7. No significant change of the pulsation period over the observation was found. A comparison with ROSAT observations i...

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We report on the discovery of a transient X-ray pulsar, AX J1841.0−0536, serendipitously found in the Scutum arm region with the ASCA in two separate observations. The X-ray flux is very faint at the beginning, but exhibits two flares in the second observation. The flare flux increases by a factor 10 within only ∼1 hr. Coherent pulsations with a period of 4.7394±0.0008 s were detected in the br...

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ژورنال

عنوان ژورنال: Publications of the Astronomical Society of Japan

سال: 1999

ISSN: 0004-6264,2053-051X

DOI: 10.1093/pasj/51.6.l15