| dc.creator | Monsalve, Raúl A. | |
| dc.creator | Fialkov, Anastasia | |
| dc.creator | Bowman, Judd D. | |
| dc.creator | Rogers, Alan E. E. | |
| dc.creator | Mozdzen, Thomas J. | |
| dc.creator | Cohen, Aviad | |
| dc.creator | Barkana, Rennan | |
| dc.creator | Mahesh, Nivedita | |
| dc.date | 2020-06-06T01:04:40Z | |
| dc.date | 2020-06-06T01:04:40Z | |
| dc.date | 2019-04-10 | |
| dc.identifier | The Astrophysical Journal, volume 875, Issue 1, article 67A, April 2019, pages: 1-17 | |
| dc.identifier | http://repositoriodigital.ucsc.cl/handle/25022009/1785 | |
| dc.description | Artículo de publicación SCOPUS | |
| dc.description | We present new constraints on parameters of cosmic dawn and the epoch of reionization derived from the EDGES High-Band spectrum (90–190 MHz). The parameters are probed by evaluating global 21 cm signals generated with the recently developed Global21cm tool. This tool uses neural networks trained and tested on ~30,000 spectra produced with semi-numerical simulations that assume the standard thermal evolution of the cosmic microwave background and the intergalactic medium. From our analysis, we constrain at 68% (1) the minimum virial circular velocity of star-forming halos to V c < 19.3 km s−1, (2) the X-ray heating efficiency of early sources to f X > 0.0042, and (3) the low-energy cutoff of the X-ray spectral energy distribution to ν min < 2.3 keV. We also constrain the star formation efficiency (f *), the electron scattering optical depth (τ e), and the mean-free path of ionizing photons (R mfp). We recompute the constraints after incorporating into the analysis four estimates for the neutral hydrogen fraction from high-z quasars and galaxies, and a prior on τ e from Planck 2018. The largest impact of the external observations is on the parameters that most directly characterize reionization. Specifically, we derive the combined 68% constraints τ e < 0.063 and R mfp > 27.5 Mpc. The external observations also have a significant effect on V c due to its degeneracy with τ e, while the constraints on f *, f X, and ν min, remain primarily determined by EDGES. | |
| dc.language | en | |
| dc.publisher | The Astrophysical Journal | |
| dc.source | https://iopscience.iop.org/article/10.3847/1538-4357/ab07be | |
| dc.subject | Cosmology | |
| dc.subject | Observations | |
| dc.subject | Early universe | |
| dc.subject | Galaxies: high-redshift | |
| dc.title | Results from edges high-band. iii. new constraints on parameters of the early universe | |
| dc.type | Article | |
