arXiv 1101.28952011-01-14astro-ph.CO

高红移暗星的观测特征

The observational signatures of high-redshift dark stars

E. Zackrisson

备注：: 5 pages, 1 figure, conference proceedings from Identification of Dark Matter 2010, Montpellier, France

摘要：

小晕中心暗物质粒子的湮灭可能导致所谓的暗星的形成，暗星比传统的第三族恒星更冷，更大，更大，可能更长寿。在这里，我们调查的前景检测高红移暗星与现有的和即将到来的望远镜。我们发现，质量低于~ 1 e3 Msolar的个别暗星本质上太暗了，即使是即将到来的詹姆斯韦伯太空望远镜（JWST）。然而，通过利用前景星系团作为引力望远镜，某些种类的暗星应该在JWST的z=10范围内。如果更多的大质量暗星能够形成，即使在没有透镜的情况下，它们也可能被JWST探测到。事实上，最近提出的一些超大质量（~ 1 e7 Msolar）暗星在z=10时足够明亮，即使用现有的设施也可以探测到，如哈勃太空望远镜和地面上的8-10米望远镜。最后，我们认为，由于最热的暗恒星（Teff > 30000 K）可以产生自己的HII区，他们可能会大大亮于恒星大气光谱的基础上估计会建议。

英文摘要：

The annihilation of dark matter particles in the centers of minihalos may lead to the formation of so-called dark stars, which are cooler, larger, more massive and potentially more long-lived than conventional population III stars. Here, we investigate the prospects of detecting high-redshift dark stars with both existing and upcoming telescopes. We find that individual dark stars with masses below ~1e3 Msolar are intrinsically too faint even for the upcoming James Webb Space Telescope (JWST). However, by exploiting foreground galaxy clusters as gravitational telescopes, certain varieties of such dark stars should be within reach of the JWST at z=10. If more massive dark stars are able to form, they may be detectable by JWST even in the absence of lensing. In fact, some of the supermassive (~1e7 Msolar) dark stars recently proposed are sufficiently bright at z=10 to be detectable even with existing facilities, like the Hubble Space Telescope and 8-10 m telescopes on the ground. Finally, we argue that since the hottest dark stars (Teff > 30000 K) can produce their own HII regions, they may be substantially brighter than what estimates based on stellar atmosphere spectra would suggest.

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