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Jetted Tidal Disruptions of Stars as a Flag of Intermediate Mass Black Holes at High Redshifts
Anastasia Fialkov, Abraham Loeb
Tidal disruption events (TDEs) of stars by single or binary supermassive black holes (SMBHs) brighten galactic nuclei and reveal a population of otherwise dormant black holes. Adop…
Charting the Parameter Space of the Global 21-cm Signal
Aviad Cohen, Anastasia Fialkov, Rennan Barkana +1
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 o…
Precise Measurement of the Reionization Optical Depth from The Global 21-cm Signal Accounting for Cosmic Heating
Anastasia Fialkov, Abraham Loeb
As a result of our limited data on reionization, the total optical depth for electron scattering, , limits precision measurements of cosmological parameters from the Cosmic Micr…
Constraining the CMB Optical Depth Through the Dispersion Measure of Cosmological Radio Transients
Anastasia Fialkov, Abraham Loeb
The dispersion measure of extragalactic radio transients, such as of recently discovered Fast Radio Burst FRB150418, can be used to measure the column density of free electrons in…
Constraining the redshifted 21-cm signal with the unresolved soft X-ray background
Anastasia Fialkov, Aviad Cohen, Rennan Barkana +1
We use the observed unresolved cosmic X-ray background (CXRB) in the 0.5-2 keV band and existing upper limits on the 21-cm power spectrum to constrain the high-redshift population…