Recognizing the First Radiation Sources Through Their 21-cm Signature

Details Recognizing the First Radiation Sources Through Their 21-cm Signature Recognizing the First Radiation Sources Through Their 21-cm Signature

2006-05-19

arxiv.org/abs/astro-ph/0605511v4

Astrophys.J.648:L1-L4,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, accepted by ApJL

Scientific paper

10.1086/507626

At the beginning of the reionization epoch, radiation sources produce fluctuations in the redshifted 21-cm background. We show that different types of sources (such as miniquasars, Pop II and III stars, supernovae, etc.) produce distinct signatures in the 21-cm signal radial profiles and statistical fluctuations, through which they can be identified. Further, we show that the 21-cm signal from X-ray emitting sources is much easier to observe than was expected, due to a previously neglected pumping mechanism.

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