Discovery of a New Pulsating X-Ray Source with a 1549.1 Second Period, AX J183220–0840
Discovery of a New Pulsating X-Ray Source with a 1549.1 Second Period, AX J183220–0840
复制标题
发现第二周期为 1549.1 的新脉动 X 射线源，AX J183220–0840
DOI：
--
复制
发表时间：
2000
影响因子：
4.9
通讯作者：
J. Yokogawa
中科院分区：
文献类型：
--
作者：
M. Sugizaki;K. Kinugasa;K. Matsuzaki;Y. Terada;S. Yamauchi;J. Yokogawa
A new pulsating X-ray source, AX J183220-0840, with a 1549.1 s period was discovered at R.A. = 18h32m20s and decl. = -8°40′30′′ (J2000, with an uncertainty of 0.′6) during an ASCA observation on the Galactic plane. The source was observed two times, in 1997 and in 1999. A phase-averaged X-ray flux of 1.1 × 10-11 ergs cm-2 s-1 and a pulsation period of 1549.1 ± 0.4 s were consistently obtained from these two observations. The X-ray spectrum was represented by a flat, absorbed power law with a photon index of Γ ≃ 0.8 and an absorption column density of NH ≃ 1.3 × 1022 cm-2. Also, a signature of iron K-shell line emission with a centroid of 6.7 keV and an equivalent width of approximately 450 eV was detected. From the pulsation period and the iron-line feature, AX J183220-0840 is likely to be a magnetic white dwarf binary with a complexly absorbed thermal spectrum with a temperature of about 10 keV.
