The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology

  title={The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology},
  author={R. Barkana},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  • R. Barkana
  • Published 2016
  • Physics
  • arXiv: Cosmology and Nongalactic Astrophysics
Understanding the formation and evolution of the first stars and galaxies represents one of the most exciting frontiers in astronomy. Since the universe was filled with hydrogen atoms at early times, the most promising probe of the epoch of the first stars is the prominent 21-cm spectral line of hydrogen. Current observational efforts are focused on the cosmic reionization era, but observations of the pre-reionization cosmic dawn are also promising. While observationally unexplored, theoretical… Expand
Organizing the Parameter Space of the Global 21-cm Signal
The early star-forming Universe is still poorly constrained, with the properties of high-redshift stars, the first heating sources, and reionization highly uncertain. This leaves observers planningExpand
Possible interaction between baryons and dark-matter particles revealed by the first stars
The analysis indicates that the spatial fluctuations of the 21-centimetre signal at cosmic dawn could be an order of magnitude larger than previously expected and that the dark-matter particle is no heavier than several proton masses, well below the commonly predicted mass of weakly interacting massive particles. Expand
Charting the parameter space of the global 21-cm signal
The early star-forming Universe is still poorly constrained, with the properties of high-redshift stars, the first heating sources, and reionization highly uncertain. This leaves observers planningExpand
Velocity-induced Acoustic Oscillations at Cosmic Dawn
The redshifted 21-cm line of hydrogen holds great potential for the study of cosmology, as it can probe otherwise unobservable cosmic epochs. In particular, measurements of the 21-cm power spectrumExpand
Charting the parameter space of the 21-cm power spectrum
The high-redshift 21-cm signal of neutral hydrogen is expected to be observed within the next decade and will reveal epochs of cosmic evolution that have been previously inaccessible. Due to the lackExpand
First results on the Epoch of Reionization from First Light with SARAS 2
Long wavelength spectral distortions in the Cosmic Microwave Background arising from the 21-cm transition in neutral Hydrogen are a key probe of Cosmic Dawn and the Epoch of Reionization. TheseExpand
Signature of excess radio background in the 21-cm global signal and power spectrum
The recent tentative detection by the EDGES Low-Band antenna of the hydrogen 21-cm line from cosmic dawn, if confirmed, is the first ever signature observed from the epoch of primordial starExpand
21-cm observations and warm dark matter models
Observations of the redshifted 21-cm signal (in absorption or emission) allow us to peek into the epoch of "dark ages" and the onset of reionization. These data can provide a novel way to learn aboutExpand
A strong broadband 21 cm cosmological signal from dark matter spin-flip interactions
In the standard cosmology, it is believed that there are two relatively weak and distinct band-limited absorption features, with the first absorption minima near 20 MHz (z ∼ 70) and the other minimaExpand
Simulating the Cosmic Dawn With Enzo
We review two decades of progress using the Enzo hydrodynamic cosmology code to simulate the Cosmic Dawn, a period of roughly 1 billion years beginning with the formation of the first stars in theExpand


The 21-cm signature of the first stars during the Lyman-Werner feedback era
The formation of the first stars is an exciting frontier area in astronomy. Early redshifts (z ∼ 20) have become observationally promising as a result of a recently recognized effect of a supersonicExpand
The global 21-centimeter background from high redshifts
We consider the evolution of the sky-averaged 21-cm background during the early phases of structure formation. Using simple analytic models, we calculate the thermal and ionization histories,Expand
The rich complexity of 21-cm fluctuations produced by the first stars
We explore the complete history of the 21-cm signal in the redshift range z = 7-40. This redshift range includes various epochs of cosmic evolution related to primordial star formation, and should beExpand
Reconstructing the nature of the first cosmic sources from the anisotropic 21-cm signal.
It is shown that on observable scales, the anisotropy is large and thus measurable at most redshifts, and its form tracks the evolution of 21-cm fluctuations as they are produced early on by Lyman-α radiation fromstars, then switch to x-ray radiation from early heating sources, and finally to ionizing radiation from stars. Expand
The X-ray spectra of the first galaxies: 21 cm signatures
The cosmological 21cm signal is a physics-rich probe of the early Universe, encoding information about both the ionization and the thermal history of the intergalactic medium (IGM). The latter isExpand
Formation of the first stars.
  • V. Bromm
  • Physics, Medicine
  • Reports on progress in physics. Physical Society
  • 2013
Predictions for the upcoming James Webb space telescope (JWST), to be launched ~2018, and for 'stellar archaeology', which probes the abundance pattern in the oldest, most-metal poor stars in the authors' cosmic neighborhood, thereby constraining the nucleosynthesis inside the first supernovae are discussed. Expand
Detecting early galaxies through their 21‐cm signature
New observations over the next few years of the emission of distant objects will help unfold the chapter in cosmic history around the era of the first galaxies. These observations will use theExpand
Cosmology at low frequencies: The 21 cm transition and the high-redshift Universe
Abstract Observations of the high-redshift Universe with the 21 cm hyperfine line of neutral hydrogen promise to open an entirely new window onto the early phases of cosmic structure formation. HereExpand
Energy Feedback from X-ray Binaries in the Early Universe
X-ray photons, because of their long mean-free paths, can easily escape the galactic environments where they are produced, and interact at long distances with the intergalactic medium, potentiallyExpand
Radio Signatures of H I at High Redshift: Mapping the End of the “Dark Ages”
The emission of 21 cm radiation from a neutral intergalactic medium (IGM) at high redshift is discussed in connection with the thermal and ionization history of the universe. The physical mechanismsExpand