Discovery of the Slowest X-Ray Pulsar in the SMC, AX J0049.5–7323, with ASCA | Zendy

Jun Yokogawa | Zendy; Kensuke Imanishi | Zendy; Masaru Ueno | Zendy; Katsuji Koyama | Zendy

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Discovery of the Slowest X-Ray Pulsar in the SMC, AX J0049.5–7323, with ASCA

Author(s) -

Jun Yokogawa,

Kensuke Imanishi,

Masaru Ueno,

Katsuji Koyama

Publication year - 2000

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/52.6.l73

Subject(s) - physics , rosat , astrophysics , pulsar , erg , luminosity , x ray pulsar , astronomy , flux (metallurgy) , x ray , be star , stars , optics , galaxy , retina , materials science , metallurgy

The discovery of coherent pulsations with ASCA from an X-ray source, AXJ0049.5-7323, 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-rayspectrum has been found to be unchanged through ASCA observations, with aphoton index of ~0.8 and a luminosity of ~5e35 erg s^-1 (0.7-10 keV). Archivaldata of the Einstein and the ROSAT satellites indicate that the flux has been <1e-12 erg s^-1 cm^-2 (< 5e35 erg s^-1) for over 20 years and exhibits avariability with a factor of >10. We argue that AX J0049.5-7323 is an X-raypulsar with a Be star companion.

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