Preheating of the early Universe by radiation from high-mass X-ray binaries
arXiv:1612.01262 · doi:10.1134/S1063773717040077
Abstract
Using a reliably measured intrinsic (i.e. corrected for absorption effects) present-day luminosity function of high-mass X-ray binaries (HMXBs) in the 0.25-2 keV energy band per unit star-formation rate, we estimate the preheating of the early Universe by soft X-rays from such systems. We find that X-ray irradiation, mainly executed by ultraluminous and supersoft ultraluminous X-ray sources with luminosity L> 10^39 erg/s, could significantly heat (T>T_cmb, where T_cmb is the temperature of the cosmic microwave background) the intergalactic medium by z~10 if the specific X-ray emissivity of the young stellar population in the early Universe was an order of magnitude higher than at the present epoch (which is possible due to the low metallicity of the first galaxies) and the soft X-ray emission from HMXBs did not suffer strong absorption within their galaxies. This makes it possible to observe the 21 cm line of neutral hydrogen in emission from redshifts z<10.
9 pages, 4 figures, accepted for publication in Astronomy Letters
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- Observational constraints on Cosmic Reionization
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- Bright end of the luminosity function of high-mass X-ray binaries: contributions of hard, soft and supersoft sources
- Microquasars as heating sources of the intergalactic medium during reionisation of the Universe
- Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
- The First Billion Years in Seconds: An Effective Model for the 21-cm Signal with Population III Stars
- Impact of ultraluminous X-ray sources on photoabsorption in the first galaxies
- Constraints on the collimated X-ray emission of SS 433 from the reflection on molecular clouds
- Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter