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arXiv 0911.3064astro-ph.HE
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异常X射线脉冲星1 E 1547.0-5408的尘埃散射X射线环

The dust-scattering X-ray rings of the anomalous X-ray pulsar 1E 1547.0-5408

A. Tiengo, G. Vianello, P. Esposito, S. Mereghetti, A. Giuliani, E. Costantini, G. L. Israel, L. Stella, R. Turolla, S. Zane, N. Rea, D. Götz, F. Bernardini, A.… 展开作者

A. Tiengo, G. Vianello, P. Esposito, S. Mereghetti, A. Giuliani, E. Costantini, G. L. Israel, L. Stella, R. Turolla, S. Zane, N. Rea, D. Götz, F. Bernardini, A. Moretti, P. Romano, M. Ehle, N. Gehrels

摘要:

2009年1月22日,观测到异常X射线脉冲星1 E 1547.0-5408的大量强烈爆发。Swift/XRT和XMM-Newton/EPIC在接下来的两周内进行了观测,发现了三个以该源为中心的X射线环。环半径随着时间的推移而增加,遵循膨胀定律,预期由三个尘埃云散射的X射线的短脉冲。假设不同的模型的尘埃成分和粒度分布,我们适合的强度衰减的每个环作为时间的函数,在不同的能量,获得严格的约束X射线源的距离。虽然距离强烈依赖于所采用的尘埃模型,我们发现,一些模型是不兼容的,我们的X射线数据,限制在4-8千秒差距的范围内可能的距离1 E 1547.0-5408。最佳拟合的尘埃模型提供了3.91 +/- 0.07 kpc的源距离,这与超新星遗迹G 327.24-0.13的拟议关联是一致的,并意味着尘埃云的距离为2.2 kpc,2.6 kpc和3.4 kpc,与1 E 1547.0-5408方向CO谱线观测推断的尘埃分布一致。然而,灰尘的距离与CO数据一致,也得到了一组类似的拟合模型,这意味着源距离约为5千秒差距。4-5千秒差距的距离也是有利的,因为这些尘埃模型已经被认为能很好地拟合明亮的X射线双星的尘埃散射晕。

英文摘要:

On 2009 January 22 numerous strong bursts were detected from the anomalous X-ray pulsar 1E 1547.0-5408. Swift/XRT and XMM-Newton/EPIC observations carried out in the following two weeks led to the discovery of three X-ray rings centered on this source. The ring radii increased with time following the expansion law expected for a short impulse of X-rays scattered by three dust clouds. Assuming different models for the dust composition and grain size distribution, we fit the intensity decay of each ring as a function of time at different energies, obtaining tight constrains on the distance of the X-ray source. Although the distance strongly depends on the adopted dust model, we find that some models are incompatible with our X-ray data, restricting to 4-8 kpc the range of possible distances for 1E 1547.0-5408. The best-fitting dust model provides a source distance of 3.91 +/- 0.07 kpc, which is compatible with the proposed association with the supernova remnant G 327.24-0.13, and implies distances of 2.2 kpc, 2.6 kpc and 3.4 kpc for the dust clouds, in good agreement with the dust distribution inferred by CO line observations towards 1E 1547.0-5408. However, dust distances in agreement with CO data are also obtained for a set of similarly well-fitting models that imply a source distance of about 5 kpc. A distance of about 4-5 kpc is also favored by the fact that these dust models are already known to provide good fits to the dust-scattering halos of bright X-ray binaries.

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