Probing the epoch of reionization using synergies of line intensity mapping

Murmu, Chandra Shekhar; Ghara, Raghunath; Majumdar, Suman; Datta, Kanan K.

doi:10.1007/s12036-022-09882-z

Cited by 2 publications

(1 citation statement)

References 207 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lyman-α line intensity mapping is expected to be a probe for the epoch of reionizationthe period of cosmic history when the primordial stars and galaxies reionized the neutral hydrogen in the intergalactic medium [1][2][3][4]. In an earlier paper [5] (hereafter Paper I), we created a model of polarized Lyman-α emission from a plane-parallel cosmic ionization front, including a treatment of polarized intensity emitted from the fronts.…”

Section: Introductionmentioning

confidence: 99%

Lyman-α polarization from cosmological ionization fronts. Part II. Implications for intensity mapping

Koivu

Long

Yang

et al. 2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

This is the second paper in a series whose aim is to predict the power spectrum of intensity and polarized intensity from cosmic reionization fronts. After building the analytic models for intensity and polarized intensity calculations in paper I, here we apply these models to simulations of reionization. We construct a geometric model for identifying front boundaries, calculate the intensity and polarized intensity for each front, and compute a power spectrum of these results. This method was applied to different simulation sizes and resolutions, so we ensure that our results are convergent. We find that the power spectrum of fluctuations at z = 8 in a bin of width Δz = 0.5 (λ/Δλ = 18) is Δℓ ≡ [ℓ(ℓ + 1)C ℓ/2π]1/2 is 3.2 × 10-11 erg s-1 cm-2 sr-1 for the intensity I, 7.6 × 10-13 erg s-1 cm-2 sr-1 for the E-mode polarization, and 5.8 × 10-13 erg s-1 cm-2 sr-1 for the B-mode polarization at ℓ = 1.5 × 104. After computing the power spectrum, we compare results to detectable scales and discuss implications for observing this signal based on a proposed experiment. We find that, while fundamental physics does not exclude this kind of mapping from being attainable, an experiment would need to be highly ambitious and require significant advances to make mapping Lyman-α polarization from cosmic reionization fronts a feasible goal.

show abstract

Section: Introductionmentioning

confidence: 99%

Lyman-α polarization from cosmological ionization fronts. Part II. Implications for intensity mapping

Koivu

Long

Yang

et al. 2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

The morphology of the redshifted 21-cm signal from the Cosmic Dawn

Ghara,

Bag,

Zaroubi

et al. 2024

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The spatial fluctuations in the tomographic maps of the redshifted 21-cm signal from the Cosmic Dawn (CD) crucially depend on the size and distribution of the regions with gas temperatures larger than the radio background temperature. In this article, we study the morphological characteristics of such emission regions and their absorption counterparts using the shape diagnostic tool surfgen2. Using simulated CD brightness temperature cubes of the 21-cm signal, we find that the emission regions percolate at stages with the filling factor of the emission regions FFemi ≳ 0.15. Percolation of the absorption regions occurs for FFabs ≳ 0.05. The largest emission and absorption regions are topologically complex and highly filamentary for most parts of the CD. The number density of these regions as a function of the volume shows the power-law nature with the power-law indexes ≈−2 and −1.6 for the emission and absorption regions, respectively. Overall, the planarity, filamentarity and genus increase with the increase of the volume of both emission and absorption regions.

show abstract

Probing the epoch of reionization using synergies of line intensity mapping

Cited by 2 publications

References 207 publications

Lyman-α polarization from cosmological ionization fronts. Part II. Implications for intensity mapping

Lyman-α polarization from cosmological ionization fronts. Part II. Implications for intensity mapping

The morphology of the redshifted 21-cm signal from the Cosmic Dawn

Contact Info

Product

Resources

About