천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제39권1호
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- Pages.32.2-32.2
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- 2014
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- 1226-2692(pISSN)
21 cm signal from highly clustered Population III and Population II objects at high redshift
- Ahn, Kyungjin (Chosun University) ;
- Xu, Hao (University of California at San Diego) ;
- Norman, Michael (University of California at San Diego) ;
- Alvarez, Marcelo (Canadian Institute for Theoretical Astrophysics) ;
- Wise, John (Georgia Institute of Technology)
- 발행 : 2014.04.10
초록
We present a prediction for 21cm differential brightness temperature (dTb) from a set of strongly clustered sources of Population III and II objects at high redshift, from a suite of numerical simulations of their formation and radiative processes. These objects are located inside a highly biased density environment ("Rarepeak"), which is a rare, high-density peak which extends to ~7 comoving Mpcs. We study the impact on the resulting 21 cm signal from their ultraviolet and X-ray properties. The boost of emission (dTb>0) by high-density environment, moderate leakage of X-ray photons, and strong absorption due to Lyman-alpha pumping contrive to make Rarepeak a discernible, spatially-extended (sky angle~10') object around z~15, which is found to be detectable as a single object by Square Kilometre Array (SKA) with integration time of ~[600-2000] hours. We also examine detectability of many such peaks through SKA precursors.
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