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Results from EDGES High-Band: II. Constraints on Parameters of Early Galaxies

Monsalve, Raul ; Greig, Bradley ; Bowman, Judd ; Mesinger, Andrei ; Rogers, Alan ; Mozdzen, Thomas ; Kern, Nicholas ; Mahesh, Nivedita; Mahesh, Nivedita (pacrepositoryorg)

arXiv.org, Jun 20, 2018 [Tạp chí có phản biện]

DOI: 10.3847/1538-4357/aace54

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  • Nhan đề:
    Results from EDGES High-Band: II. Constraints on Parameters of Early Galaxies
  • Tác giả: Monsalve, Raul ; Greig, Bradley ; Bowman, Judd ; Mesinger, Andrei ; Rogers, Alan ; Mozdzen, Thomas ; Kern, Nicholas ; Mahesh, Nivedita
  • Mahesh, Nivedita (pacrepositoryorg)
  • Chủ đề: Mathematical Models ; Luminosity ; Star Formation ; Interstellar Matter ; Attenuation ; Ionization ; Galaxies ; Parameters ; Quasars ; Absorption ; Computer Simulation ; Cosmology and Nongalactic Astrophysics ; Astrophysics of Galaxies
  • Là 1 phần của: arXiv.org, Jun 20, 2018
  • Mô tả: We use the sky-average spectrum measured by EDGES High-Band (\(90-190\) MHz) to constrain parameters of early galaxies independent of the absorption feature at \(78\)~MHz reported by Bowman et al. (2018). These parameters represent traditional models of cosmic dawn and the epoch of reionization produced with the 21cmFAST simulation code (Mesinger & Furlanetto 2007, Mesinger et al. 2011). The parameters considered are: (1) the UV ionizing efficiency (\(\zeta\)), (2) minimum halo virial temperature hosting efficient star-forming galaxies (\(T^{\rm min}_{\rm vir}\)), (3) integrated soft-band X-ray luminosity (\(L_{\rm X\,<\,2\,keV}/{\rm SFR}\)), and (4) minimum X-ray energy escaping the first galaxies (\(E_{0}\)), corresponding to a typical H\({\rm \scriptstyle I}\) column density for attenuation through the interstellar medium. The High-Band spectrum disfavors high values of \(T^{\rm min}_{\rm vir}\) and \(\zeta\), which correspond to signals with late absorption troughs and sharp reionization transitions. It also disfavors intermediate values of \(L_{\rm X\,<\,2\,keV}/{\rm SFR}\), which produce relatively deep and narrow troughs within the band. Specifically, we rule out \(39.4<\log_{10}\left(L_{\rm X\,<\,2\,keV}/{\rm SFR}\right)<39.8\) (\(95\%\) C.L.). We then combine the EDGES High-Band data with constraints on the electron scattering optical depth from Planck and the hydrogen neutral fraction from high-\(z\) quasars. This produces a lower degeneracy between \(\zeta\) and \(T^{\rm min}_{\rm vir}\) than that reported in Greig & Mesinger (2017a) using the Planck and quasar constraints alone. Our main result in this combined analysis is the estimate \(4.5\)~\(\leq \log_{10}\left(T^{\rm min}_{\rm vir}/\rm K\right)\leq\)~\(5.7\) (\(95\%\) C.L.). We leave for future work the evaluation of \(21\)~cm models using simultaneously data from EDGES Low- and High-Band.
  • Ngôn ngữ: English
  • Số nhận dạng: DOI: 10.3847/1538-4357/aace54

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