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arXiv 0802.0152astro-ph
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G21-0.9的展开和射电谱指数:PSR J1833-1034是最年轻的脉冲星吗?

The Expansion and Radio Spectral Index of G21.5-0.9: Is PSR J1833-1034 the Youngest Pulsar?

M. F. Bietenholz, N. Bartel

摘要:

我们报告新的5 GHz VLA射电观测的脉冲星供电的超新星遗迹G21.5-0.9。这些观测使我们能够制作出分辨率约为0.7”的高质量射电图像。它有一个类似于蟹状星云的星云结构。初步确定了蟹状星云脉冲星周围的射电结构。我们还将新图像与15年前在1.5 GHz拍摄的图像进行了比较,以找到残留物的扩张速度并制作光谱指数图像。在1991年至2006年期间,我们发现残骸的平均膨胀率为0.11 +/-0.02%/年,对应于5 kpc的距离,速度为910 +/- 160 km/s wrt。星云的中心假设膨胀未减速,这个膨胀速度意味着G21.5-0.9的年龄是870(+200,-150)年,这使得PSR J1833-1034即使不是银河系中最年轻的已知恒星之一。

英文摘要:

We report on new 5-GHz VLA radio observations of the pulsar-powered supernova remnant G21.5-0.9. These observations have allowed us to make a high-quality radio image of this remnant with a resolution of ~0.7". It has a filamentary structure similar to that seen in the Crab Nebula. Radio structure suggestive of the torus seen around the Crab pulsar is tentatively identified. We also compared the new image with one taken ~15 yr earlier at 1.5 GHz, both to find the expansion speed of the remnant and to make a spectral index image. Between 1991 and 2006, we find that the average expansion rate of the remnant is 0.11 +/- 0.02 %/year, corresponding, for a distance of 5 kpc, to a speed of 910 +/- 160 km/s wrt. the centre of the nebula. Assuming undecelerated expansion, this expansion speed implies that the age of G21.5-0.9 is 870 (+200,-150) yr, which makes PSR J1833-1034 one of the youngest, if not the youngest, known pulsars in the Galaxy.

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