Requirements for cosmological 21-cm masers
نویسندگان
چکیده
منابع مشابه
Requirements for Cosmological 21cm Masers
We explore the prospects for a population inversion in the hyperfine levels of atomic hydrogen at high redshifts when the Universe was still predominantly neutral. The existence of 21-cm masers during the epoch of reionisation (EoR) could greatly boost the expected EoR signals. We perform Monte-Carlo calculations of the radiative transfer of Lyα photons emitted by a source embedded in a neutral...
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Rapid advances in observational cosmology have led to the establishment of a precision cosmological model, with many of the key cosmological parameters determined to one or two significant figure accuracy. Particularly prominent are measurements of cosmic microwave background (CMB) anisotropies, led by the seven-year results from the Wilkinson Microwave Anisotropy Probe (WMAP) [1–3]. However th...
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. In order to study the " Cosmic Dawn " and the Epoch of Reionization with 21 cm tomography, we need to statistically...
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Constraints on cosmological parameters from upcoming measurements with the Mileura Widefield Array—Low Frequency Demonstrator (MWA-LFD) of the redshifted 21 cm power spectrum are forecast assuming a flat ΛCDM cosmology and that the reionization of neutral hydrogen in the intergalactic medium occurs below a redshift of z = 8. We find that observations with the MWA-LFD cannot constrain the underl...
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We investigate the effects of warm dark matter (WDM) on the cosmic 21-cm signal. If dark matter exists as WDM instead of cold dark matter (CDM), its non-negligible velocities can inhibit the formation of low-mass haloes that normally form first in CDM models, therefore delaying star formation. The absence of early sources delays the build-up of UV and X-ray backgrounds that affect the 21-cm rad...
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ژورنال
عنوان ژورنال: New Astronomy
سال: 2008
ISSN: 1384-1076
DOI: 10.1016/j.newast.2007.11.009