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arXiv 0810.3745astro-ph
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HESS J1837 --069与朱雀和ASCA的X射线研究：源自脉冲星风星云的VHE gamma-ray源

X-ray studies of HESS J1837--069 with Suzaku and ASCA: a VHE gamma-ray source originated from the pulsar wind nebula

Takayasu Anada, Ken Ebisawa, Tadayasu Dotani, Aya Bamba

备注：
9 pages, 7 figures, accepted for publication in PASJ, revised figures
发表信息：
Publ. Astron. Soc. Japan 61, S183-S187, 2009 January 30
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摘要：

我们介绍了ASCA和朱雀研究的TeV源HESS J1837- 069，这还没有确定在其他波长。我们确认在朱雀XIS图像中存在两个X射线源，AX J1838.0--0655和AX J1837.3--0652，靠近延长的TeV发射区的两端。两个源的XIS谱均由吸收的幂律模型再现，其参数与ASCA数据确定的参数一致。最近，在包括HESS J1837- 069（2008，ApJ，681，515）的天空区域中，已经用RXTE检测到70.5 ms的X射线脉动。利用具有定时和成像能力的ASCA GIS数据，我们确定脉动源为AX J1838.0--0655。ASCA和Suzaku测定的脉冲周期以及RXTE报告的脉冲周期表明稳定的自旋下降在$\dot{P} = 4.917(4) \times 10^{-14}$ s $^{-1}$。这些结果表明，AX J1838.0- 0655是一个内在稳定的源，可能是一个脉冲星风星云（PWN）。本文讨论了AX J1838.0- 0655与HESS J1837- 069有关的可能性，以及VHE γ射线发射来源于PWN的可能性。

英文摘要：

We present the ASCA and Suzaku studies of the TeV source HESS J1837--069, which has not been identified in other wave-lengths. We confirm the presence of two X-ray sources in the Suzaku XIS image, AX J1838.0--0655 and AX J1837.3--0652, near both ends of the elongated TeV emission region. The XIS spectra of the two sources are reproduced by an absorbed power-law model, whose parameters are all consistent with those determined by the ASCA data. Recently, 70.5 ms X-ray pulsation has been detected with RXTE in the sky region including HESS J1837--069 (2008, ApJ, 681, 515). Using the ASCA GIS data which has both timing and imaging capabilities, we identified the pulsation source as AX J1838.0--0655. The pulse periods determined by ASCA and Suzaku, and that reported with RXTE indicate steady spin-down at $\dot{P} = 4.917(4) \times 10^{-14}$ s s$^{-1}$. These results suggest that AX J1838.0--0655 is an intrinsically stable source, and presumably a pulsar wind nebula (PWN). We discuss the possibility that AX J1838.0--0655 is associated with HESS J1837--069 and the VHE gamma-ray emission is originated from the PWN.

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