114 citations · 654 across the 25 of their papers we have counts for
26 papers
Influence of turbulence on Lyman-alpha scattering
Vadim R. Munirov, Alexander A. Kaurov
We develop a Monte Carlo radiative transfer code to study the effect of turbulence with a finite correlation length on scattering of Lyman-alpha (Ly) photons propagating through…
Detecting the non-Gaussianity of the 21-cm signal during reionisation with the Wavelet Scattering Transform
Bradley Greig, Yuan-Sen Ting, Alexander A. Kaurov
Detecting the 21-cm hyperfine transition from neutral hydrogen in the intergalactic medium is our best probe for understanding the astrophysical processes driving the Epoch of Reio…
Exploring the cosmic 21-cm signal from the Epoch of Reionisation using the Wavelet Scattering Transform
Bradley Greig, Yuan-Sen Ting, Alexander A. Kaurov
Detecting the cosmic 21-cm signal during the Epoch of Reionisation and Cosmic Dawn will reveal insights into the properties of the first galaxies and advance cosmological parameter…
On the optical properties of Resonant Drag Instabilities: Variability of Asymptotic Giant Branch and R Coronae Borealis stars
Ulrich P. Steinwandel, Alexander A. Kaurov, Philip F. Hopkins +1
In dusty cool-star outflow or ejection events around AGB or RCB-like stars, dust is accelerated by radiation from the star and coupled to the gas via collisional drag forces. But i…
Simulations of Fe entrained in ejecta from a near-Earth supernova: Effects of observer motion
Evgenii Chaikin, Alexander A. Kaurov, Brian D. Fields +1
Recent studies have shown that live (not decayed) radioactive Fe is present in deep-ocean samples, Antarctic snow, lunar regolith, and cosmic rays. Fe represents supe…
Asymmetric Surface Brightness Structure of Caustic Crossing Arc in SDSS J1226+2152: A Case for Dark Matter Substructure
Liang Dai, Alexander A. Kaurov, Keren Sharon +6
We study the highly magnified arc SGAS J122651.3+215220 caused by a star-forming galaxy at crossing the lensing caustic cast by the galaxy cluster SDSS J1226+2152 ($z_l=…
Research and Development for HI Intensity Mapping
Zeeshan Ahmed, David Alonso, Mustafa A. Amin +51
Development of the hardware, data analysis, and simulation techniques for large compact radio arrays dedicated to mapping the 21 cm line of neutral hydrogen gas has proven to be mo…
Packed Ultra-wideband Mapping Array (PUMA): A Radio Telescope for Cosmology and Transients
Kevin Bandura, Emanuele Castorina, Liam Connor +23
PUMA is a proposal for an ultra-wideband, low-resolution and transit interferometric radio telescope operating at . Its design is driven by six science goal…
Highly Magnified Stars in Lensing Clusters: New Evidence in a Galaxy Lensed by MACS J0416.1-2403
Alexander A. Kaurov, Liang Dai, Tejaswi Venumadhav +2
We examine a caustic-straddling arc at in the field of the galaxy cluster MACS J0416.1-2403 () using archival multiband HST images and show that its surface bri…
Non-perturbative probability distribution function for cosmological counts in cells
Mikhail M. Ivanov, Alexander A. Kaurov, Sergey Sibiryakov
We present a non-perturbative calculation of the 1-point probability distribution function (PDF) for the spherically-averaged matter density field. The PDF is represented as a path…
Implication of the Shape of the EDGES Signal for the 21 cm Power Spectrum
Alexander A. Kaurov, Tejaswi Venumadhav, Liang Dai +1
We revisit the 21 cm power spectrum from the epoch of cosmic dawn in light of the recent EDGES detection of the 21 cm global signal at frequencies corresponding to . The s…
Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn
Tejaswi Venumadhav, Liang Dai, Alexander Kaurov +1
The intergalactic medium is expected to be at its coldest point before the formation of the first stars in the universe. Motivated by recent results from the EDGES experiment, we r…
Probing Dark Matter Subhalos in Galaxy Clusters Using Highly Magnified Stars
Liang Dai, Tejaswi Venumadhav, Alexander A. Kaurov +1
Luminous stars in background galaxies straddling the lensing caustic of a foreground galaxy cluster can be individually detected due to extreme magnification factors of …
Observing galaxy mergers at the epoch of reionization
Evgenii A. Chaikin, Nadezda V. Tyulneva, Alexander A. Kaurov
The galaxies with photometric redshifts observed in a close angular proximity might be either projection coincidences, strongly lensed images of the same galaxy, or separate galaxi…
Stochasticity in the 21cm power spectrum at the epoch of reionization and cosmic dawn
Alexander A. Kaurov
The 21cm neutral hydrogen line is likely to be a key probe for studying the epoch of reionization and comic dawn in the forthcoming decades. This prospect stimulates the developmen…
The Effects of Dark Matter Annihilation on Cosmic Reionization
Alexander A. Kaurov, Dan Hooper, Nickolay Y. Gnedin
We revisit the possibility of constraining the properties of dark matter (DM) by studying the epoch of cosmic reionization. Previous studies have shown that DM annihilation was unl…
On improving analytical models of cosmic reionization for matching numerical simulation
Alexander A. Kaurov
The methods for studying the epoch of cosmic reionization vary from full radiative transfer simulations to purely analytical models. While numerical approaches are computationally…
Cosmic Reionization On Computers. Mean and Fluctuating Redshifted 21 cm Signal
Alexander A. Kaurov, Nickolay Y. Gnedin
We explore the mean and fluctuating redshifted 21 cm signal in numerical simulations of cosmic reionization from the Cosmic Reionization On Computers (CROC) project. We find that t…
Energy dissipation of energetic electrons in the inhomogeneous intergalactic medium during the epoch of reionization
Alexander A. Kaurov
We explore a time-dependent energy dissipation of the energetic electrons in the inhomogeneous intergalactic medium (IGM) during the epoch of cosmic reionization. In addition to th…
Central compact objects in Kes 79 and RCW 103 as "hidden" magnetars with crustal activity
S. B. Popov, A. A. Kaurov, A. D. Kaminker
We propose that observations of "hidden" magnetars in central compact objects can be used to probe crustal activity of neutron stars with large internal magnetic fields. Estimates…
Cosmic Reionization On Computers III. The Clumping Factor
Alexander A. Kaurov, Nickolay Y. Gnedin
We use fully self-consistent numerical simulations of cosmic reionization, completed under the Cosmic Reionization On Computers (CROC) project, to explore how well the recombinatio…
Thermal emission of neutron stars with internal heaters
A. D. Kaminker, A. A. Kaurov, A. Y. Potekhin +1
Using 1D and 2D cooling codes we study thermal emission from neutron stars with steady state internal heaters of various intensities and geometries (blobs or spherical layers) loca…
Cosmic Reionization On Computers II. Reionization History and Its Back Reaction on Early Galaxies
Nickolay Y. Gnedin, Alexander A. Kaurov
We compare the results from several sets of cosmological simulations of cosmic reionization, produced under Cosmic Reionization On Computers (CROC) project, with existing observati…
Recombination clumping factor during cosmic reionization
Alexander A. Kaurov, Nickolay Y. Gnedin
We discuss the role of recombinations in the IGM, and the related concept of the clumping factor, during cosmic reionization. The clumping factor is, in general, a local quantity t…