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arXiv 1206.1676astro-ph.HEastro-ph.CO
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星系团中恒星形成的γ射线

Gamma Rays from Star Formation in Clusters of Galaxies

Emma Storm, Tesla E. Jeltema, Stefano Profumo

摘要:

星系中的恒星形成被观察到与伽马射线发射有关。费米大天区望远镜(LAT)对恒星形成星系的伽马射线的探测,使得可以确定恒星形成速率和伽马射线光度之间的函数关系(Ackermann et. 2012)。由于已知恒星的形成与总红外(8-1000微米)和射电(1.4 GHz)光度成比例,因此观测到的恒星形成星系的红外和射电辐射可以用来定量推断星系的伽马射线光度。类似地,在星系团内的恒星形成星系使我们能够推导出星系团伽马射线发射的下限,这在伽马射线中还没有被最终检测到。在这项研究中,我们应用阿克曼等伽马射线光度和无线电和红外光度之间的关系。al. 2012到Ackermann et.的星系团样本。2010年,以便对与星系团中恒星形成有关的伽马射线发射设定下限。我们发现,有几个集群预测的伽马射线发射的下限是在阿克曼等的上限的数量级内。2010年,基于Fermi-LAT未检测到。考虑到目前的伽马射线极限,恒星的形成可能在某些星团的伽马射线发射中起着重要作用,特别是那些具有冷核心的星团。我们预测,无论是费米-LAT在其生命周期的过程中,未来的切伦科夫望远镜阵列将能够检测到伽马射线发射的恒星形成星系的集群。

英文摘要:

Star formation in galaxies is observed to be associated with gamma-ray emission. The detection of gamma rays from star-forming galaxies by the Fermi Large Area Telescope (LAT) has allowed the determination of a functional relationship between star formation rate and gamma-ray luminosity (Ackermann et. al. 2012). Since star formation is known to scale with total infrared (8-1000 micrometers) and radio (1.4 GHz) luminosity, the observed infrared and radio emission from a star-forming galaxy can be used to quantitatively infer the galaxy's gamma-ray luminosity. Similarly, star forming galaxies within galaxy clusters allow us to derive lower limits on the gamma-ray emission from clusters, which have not yet been conclusively detected in gamma rays. In this study we apply the relationships between gamma-ray luminosity and radio and IR luminosities derived in Ackermann et. al. 2012 to a sample of galaxy clusters from Ackermann et. al. 2010 in order to place lower limits on the gamma-ray emission associated with star formation in galaxy clusters. We find that several clusters have predicted lower limits on gamma-ray emission that are within an order of magnitude of the upper limits derived in Ackermann et. al. 2010 based on non-detection by Fermi-LAT. Given the current gamma-ray limits, star formation likely plays a significant role in the gamma-ray emission in some clusters, especially those with cool cores. We predict that both Fermi-LAT over the course of its lifetime and the future Cherenkov Telescope Array will be able to detect gamma-ray emission from star-forming galaxies in clusters.

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