Two new intermediate polars with a soft X-ray component
Two new intermediate polars with a soft X-ray component
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两个带有软 X 射线组件的新型中间极轴
DOI:
10.1051/0004-6361:200810402
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发表时间:
2008
影响因子:
6.5
通讯作者:
Anzolin G
中科院分区:
文献类型:
--
作者:
Anzolin G
AimsWe analyze the first X-ray observations with XMM-Newton of 1RXS J070407.9+262501 and 1RXS 180340.0+401214, in order to characterize their broad-band temporal and spectral properties, also in the UV/optical domain, and to confirm them as intermediate polars.MethodsFor both objects, we performed a timing analysis of the X-ray and UV/optical light curves to detect the white dwarf spin pulsations and study their energy dependence. For 1RXS 180340.0+401214 we also analyzed optical spectroscopic data to determine the orbital period. X-ray spectra were analyzed in the 0.2–10.0 keV range to characterize the emission properties of both sources.ResultsWe find that the X-ray light curves of both systems are energy dependent and are dominated, below 3–5 keV, by strong pulsations at the white dwarf rotational periods (480 s for 1RXS J070407.9+262501 and 1520.5 s for 1RXS 180340.0+401214). In 1RXS 180340.0+401214 we also detect an X-ray beat variability at 1697 s which, together with our new optical spectroscopy, favours an orbital period of 4.4 h that is longer than previously estimated. Both systems show complex spectra with a hard (temperature up to 40 keV) optically thin and a soft (kT~ 85–100 eV) optically thick components heavily absorbed by material partially covering the X-ray sources.ConclusionsOur observations confirm the two systems as intermediate polars and also add them as new members of the growing group of “soft” systems which show the presence of a soft X-ray blackbody component. Differences in the temperatures of the blackbodies are qualitatively explained in terms of reprocessing over different sizes of the white dwarf spot. We suggest that systems showing cooler soft X-ray blackbody components also possess white dwarfs irradiated by cyclotron radiation.
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影响因子:
4.8
作者:
A. Norton;I. McHardy;H. Lehto;M. Watson
通讯作者:
M. Watson
DOI:
10.1086/183121
发表时间:
1977
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Lamb;A. R. Masters
通讯作者:
A. R. Masters
DOI:
10.1086/305149
发表时间:
1997
期刊:
The Astrophysical Journal
影响因子:
--
作者:
P. Armitage;M. Livio
通讯作者:
M. Livio
影响因子:
6.5
作者:
M. Koenig;K. Beuermann;B. Gaensicke
通讯作者:
B. Gaensicke
DOI:
10.1017/s0252921100001822
发表时间:
2003
期刊:
arXiv: Astrophysics
影响因子:
--
作者:
P. Woudt;B. Warner
通讯作者:
B. Warner