Discovery of 101-s Pulsations from AX J0057.4–7325 in the SMC with ASCA | Zendy

Jun Yokogawa | Zendy; Ken’ichi Torii | Zendy; Takayoshi Kohmura | Zendy; Kensuke Imanishi | Zendy; Katsuji Koyama | Zendy

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Discovery of 101-s Pulsations from AX J0057.4–7325 in the SMC with ASCA

Author(s) -

Jun Yokogawa,

Ken’ichi Torii,

Takayoshi Kohmura,

Kensuke Imanishi,

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.l53

Subject(s) - rosat , physics , flux (metallurgy) , astrophysics , variation (astronomy) , barycentric coordinate system , geometry , galaxy , mathematics , metallurgy , materials science

The results from two ASCA observations of AX J0057.4-7325 = RX J0057.3-7325are presented. Coherent pulsations with a barycentric period of 101.45 +/- 0.07s were discovered in the second observation. The X-ray spectrum was found to behard (photon index ~ 0.9) and unchanged through these observations, except forthe flux. The ROSAT archival data show that AX J0057.4-7325 exhibits a fluxvariation with a factor >~ 10. A discussion on a possible optical counterpartis given.

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