199 citations · 714 across the 13 of their papers we have counts for
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A Unified Analysis of Four Cosmic Shear Surveys
Chihway Chang, Michael Wang, Scott Dodelson +13
In the past few years, several independent collaborations have presented cosmological constraints from tomographic cosmic shear analyses. These analyses differ in many aspects: the…
Baryonic effects in cosmic shear tomography: PCA parametrization and importance of extreme baryonic models
Irshad Mohammed, Nickolay Y. Gnedin
Baryonic effects are amongst the most severe systematics to the tomographic analysis of weak lensing data which is the principal probe in many future generations of cosmological su…
Perturbative approach to covariance matrix of the matter power spectrum
Irshad Mohammed, Uros Seljak, Zvonimir Vlah
We evaluate the covariance matrix of the matter power spectrum using perturbation theory up to dominant terms at 1-loop order and compare it to numerical simulations. We decompose…
A supervised machine learning estimator for the non-linear matter power spectrum - SEMPS
Irshad Mohammed, Janu Verma
In this article, we argue that models based on machine learning (ML) can be very effective in estimating the non-linear matter power spectrum (). We employ the prediction abi…
Testing light-traces-mass in Hubble Frontier Fields Cluster MACS-J0416.1-2403
Kevin Sebesta, Liliya L. R. Williams, Irshad Mohammed +2
We reconstruct the projected mass distribution of a massive merging Hubble Frontier Fields cluster MACSJ0416 using the genetic algorithm based free-form technique called Grale. The…
Quantifying substructures in {\it Hubble Frontier Field} clusters: comparison with simulations
Irshad Mohammed, Prasenjit Saha, Liliya L. R. Williams +2
The Hubble Frontier Fields (HFF) are six clusters of galaxies, all showing indications of recent mergers, which have recently been observed for lensed images. As such they are the…
The behaviour of dark matter associated with 4 bright cluster galaxies in the 10kpc core of Abell 3827
Richard Massey, Liliya Williams, Renske Smit +20
Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10kpc. Such corrugation of the stellar distribution i…
Lensing time delays as a substructure constraint: a case study with the cluster SDSS~J1004+4112
Irshad Mohammed, Prasenjit Saha, Jori Liesenborgs
Gravitational lensing time delays are well known to depend on cosmological parameters, but they also depend on the details of the mass distribution of the lens. It is usual to mode…
Baryonic effects on weak-lensing two-point statistics and its cosmological implications
Irshad Mohammed, Davide Martizzi, Romain Teyssier +1
We develop an extension of \textit{the Halo Model} that describes analytically the corrections to the matter power spectrum due to the physics of baryons. We extend these correctio…
Analytic model for the matter power spectrum, its covariance matrix, and baryonic effects
Irshad Mohammed, Uros Seljak
We develop a model for the matter power spectrum as the sum of Zeldovich approximation and even powers of , i.e., , compensated at low . With ter…
Constraining galaxy cluster temperatures and redshifts with eROSITA survey data
Katharina Borm, Thomas H. Reiprich, Irshad Mohammed +1
The nature of dark energy is imprinted in the large-scale structure of the Universe and thus in the mass and redshift distribution of galaxy clusters. The upcoming eROSITA mission…
Mass-Galaxy offsets in Abell 3827, 2218 and 1689: intrinsic properties or line-of-sight substructures?
Irshad Mohammed, Jori Liesenborgs, Prasenjit Saha +1
We have made mass maps of three strong-lensing clusters, Abell 3827, Abell 2218 and Abell 1689, in order to test for mass-light offsets. The technique used is GRALE, which enables…
The biasing of baryons on the cluster mass function and cosmological parameter estimation
Davide Martizzi, Irshad Mohammed, Romain Teyssier +1
We study the effect of baryonic processes on the halo mass function in the galaxy cluster mass range using a catalogue of 153 high resolution cosmological hydrodynamical simulation…