The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.
Detecting the Earliest Galaxies through Two New Sources of 21 Centimeter Fluctuations
Open accessAbstract
The first galaxies that formed at a redshift z ~ 20-30 emitted continuum photons with energies between the Lyα and Lyman limit wavelengths of hydrogen, to which the neutral universe was transparent except at the Lyman series resonances. As these photons redshifted or scattered into the Lyα resonance, they coupled the spin temperature of the 21 cm transition of hydrogen to the gas temperature, allowing it to deviate from the microwave background temperature. We show that the fluctuations in the radiation emitted by the first galaxies produced strong fluctuations in the 21 cm flux before the Lyα coupling became saturated. The fluctuations were caused by biased inhomogeneities in the density of galaxies, along with Poisson fluctuations in the number of galaxies. Observing the power spectra of these two sources would probe the number density of the earliest galaxies and the typical mass of their host dark matter halos. The enhanced amplitude of the 21 cm fluctuations from the era of Lyα coupling improves considerably the practical prospects for their detection.
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Cited by
Observational Constraints on Cosmic Reionization
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A model of diffuse Galactic radio emission from 10 MHz to 100 GHz
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Fundamental physics with the Square Kilometre Array
Weltman, A., Bull, P., Camera, S., Kelley, K., Padmanabhan, H., Pritchard, J., Raccanelli, A., Riemer-Sørensen, S., Shao, L., Andrianomena, S., et al. (2020) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2019.42 · Cited by 384
Self-citation
Metadata
- Authors
- Barkana, R., & Loeb, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2005-06-10
- Volume
- 626
- Issue
- 1
- Pages
- 1-11
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1923079237
- Cited by
- 278
- References
- 33
- FWCI
- 10.54
- Type
- journal article
- Language
- en
- Open access
- bronze
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