A 168-s X-Ray Pulsar in the SMC Observed with ASCA
نویسندگان
چکیده
We report on the detection of 167.8± 0.2 s pulsations from AX J0052.9−7157 in the Small Magellanic Cloud with ASCA. The pulsations show an energy-independent sinusoidal profile. The X-ray spectrum is described by an absorbed hard power-law (photon index ∼ 0.7) with a luminosity of ∼ 8.8× 10 erg s at a distance of 60 kpc. The position is determined to be (R.A., Dec.)J2000 = (00 5259.2, −715758), with an error radius of ∼ 30. We have found that a variable Be/X-ray binary RX J0052.9−7158 is located within the 30 error circle, and is also located at the edge of the 10 error circle of the 169-s pulsar XTE J0054−720. We therefore conclude that these are the same source, a Be/X-ray binary pulsar.
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