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

Abstract

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

4 pages, 4 figures, to be published in PASJ. Also available at http://www-cr.scphys.kyoto-u.ac.jp/member/jun/job/

Cited by in corpus (9)

• High-Mass X-ray binaries in the Small Magellanic Cloud
• A Long Look at the Be/X-Ray Binaries of the Small Magellanic Cloud
• Very Long-term Optical Variability of High Mass X-ray Binaries in the SMC
• Review of Discrete X-Ray Sources in the Small Magellanic Cloud: Summary of the ASCA Results and Implication on the Recent Star Forming Activity
• The Discovery of an Outburst and Pulsed X-ray Flux from SMC X-2 from RXTE Observations
• Discovery of pulsations from the Be/X-ray binary RX J0101.3-7211 in the SMC by XMM-Newton
• Discovery of a 26.2 day period in the long-term X-ray light curve of SXP 1323: a very short orbital period for a long spin period pulsar
• Constraining compactness and magnetic field geometry of X-ray pulsars from the statistics of their pulse profiles
• A 168-s X-Ray Pulsar in the SMC Observed with ASCA