Mohammadjavad Vakili
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View article: Clustering of red sequence galaxies in the fourth data release of the Kilo-Degree Survey
Clustering of red sequence galaxies in the fourth data release of the Kilo-Degree Survey Open
We present a sample of luminous red sequence galaxies as the basis for a study of the large-scale structure in the fourth data release of the Kilo-Degree Survey. The selected galaxies are defined by a red sequence template, in the form of …
View article: Dynamical cluster masses from photometric surveys
Dynamical cluster masses from photometric surveys Open
The masses of galaxy clusters can be measured using data obtained exclusively from wide photometric surveys in one of two ways: directly from the amplitude of the weak lensing signal or, indirectly, through the use of scaling relations cal…
View article: Dynamical cluster masses from photometric surveys
Dynamical cluster masses from photometric surveys Open
The masses of galaxy clusters can be measured using data obtained exclusively from wide photometric surveys in one of two ways: directly from the amplitude of the weak lensing signal or, indirectly, through the use of scaling relations cal…
View article: KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies
KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies Open
We constrain the luminosity and redshift dependence of the intrinsic alignment (IA) of a nearly volume-limited sample of luminous red galaxies selected from the fourth public data release of the Kilo-Degree Survey (KiDS-1000). To measure t…
View article: Bright galaxy sample in the Kilo-Degree Survey Data Release 4
Bright galaxy sample in the Kilo-Degree Survey Data Release 4 Open
We present a bright galaxy sample with accurate and precise photometric redshifts (photo- z s), selected using ugriZYJHK s photometry from the Kilo-Degree Survey (KiDS) Data Release 4. The highly pure and complete dataset is flux-limited a…
View article: KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies
KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies Open
We constrain the luminosity and redshift dependence of the intrinsic alignment (IA) of a nearly volume-limited sample of luminous red galaxies selected from the fourth public data release of the Kilo-Degree Survey (KiDS-1000). To measure t…
View article: Bright galaxy sample in the Kilo-Degree Survey Data Release 4: selection, photometric redshifts, and physical properties
Bright galaxy sample in the Kilo-Degree Survey Data Release 4: selection, photometric redshifts, and physical properties Open
We present a bright galaxy sample with accurate and precise photometric redshifts (photo-zs), selected using $ugriZYJHK_\mathrm{s}$ photometry from the Kilo-Degree Survey (KiDS) Data Release 4 (DR4). The highly pure and complete dataset is…
View article: Clustering of red-sequence galaxies in the fourth data release ofthe Kilo-Degree Survey
Clustering of red-sequence galaxies in the fourth data release ofthe Kilo-Degree Survey Open
We present a sample of luminous red-sequence galaxies to study the large-scale structure in the fourth data release of the Kilo-Degree Survey. The selected galaxies are defined by a red-sequence template, in the form of a data-driven model…
View article: GAMA + KiDS: empirical correlations between halo mass and other galaxy properties near the knee of the stellar-to-halo mass relation
GAMA + KiDS: empirical correlations between halo mass and other galaxy properties near the knee of the stellar-to-halo mass relation Open
We use KiDS weak lensing data to measure variations in mean halo mass as a function of several key galaxy properties (namely stellar colour, specific star formation rate, Sérsic index, and effective radius) for a volume-limited sample of G…
View article: The bias of dark matter tracers: assessing the accuracy of mapping techniques
The bias of dark matter tracers: assessing the accuracy of mapping techniques Open
We present a comparison between approximated methods for the construction of mock catalogues based on the halo-bias mapping technique. To this end, we use as reference a high-resolution N-body simulation of 38403 dark matter particles on a…
View article: Luminous red galaxies in the Kilo-Degree Survey: selection with broad-band photometry and weak lensing measurements
Luminous red galaxies in the Kilo-Degree Survey: selection with broad-band photometry and weak lensing measurements Open
We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey (SDSS) and Galaxy And Mass Assembly (GAMA) to infer the colour-magnitude relation of red-sequence…
View article: Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles
Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles Open
We study the accuracy of several approximate methods for gravitational dynamics in terms of halo power spectrum multipoles and their estimated covariance matrix. We propagate the differences in covariances into parameter constraints relate…
View article: Comparing approximate methods for mock catalogues and covariance matrices – III: bispectrum
Comparing approximate methods for mock catalogues and covariance matrices – III: bispectrum Open
We compare the measurements of the bispectrum and the estimate of its covariance obtained from a set of different methods for the efficient generation of approximate dark matter halo catalogues to the same quantities obtained from full N-b…
View article: Comparing approximate methods for mock catalogues and covariance matrices – I. Correlation function
Comparing approximate methods for mock catalogues and covariance matrices – I. Correlation function Open
This paper is the first in a set that analyses the covariance matrices of clustering statistics obtained from several approximate methods for gravitational structure formation. We focus here on the covariance matrices of anisotropic two-po…
View article: Accurate halo–galaxy mocks from automatic bias estimation and particle mesh gravity solvers
Accurate halo–galaxy mocks from automatic bias estimation and particle mesh gravity solvers Open
Reliable extraction of cosmological information from clustering measurements\nof galaxy surveys requires estimation of the error covariance matrices of\nobservables. The accuracy of covariance matrices is limited by our ability to\ngenerat…
View article: Approximate Bayesian computation in large-scale structure: constraining the galaxy–halo connection
Approximate Bayesian computation in large-scale structure: constraining the galaxy–halo connection Open
Standard approaches to Bayesian parameter inference in large scale structure assume a Gaussian functional form (chi-squared form) for the likelihood. This assumption, in detail, cannot be correct. Likelihood free inferences such as Approxi…
View article: Do fast stellar centroiding methods saturate the Cram\\'{e}r-Rao lower\n bound?
Do fast stellar centroiding methods saturate the Cram\\'{e}r-Rao lower\n bound? Open
One of the most demanding tasks in astronomical image processing---in terms\nof precision---is the centroiding of stars. Upcoming large surveys are going to\ntake images of billions of point sources, including many faint stars, with\nshort…
View article: Do fast stellar centroiding methods saturate the Cramér-Rao lower bound?
Do fast stellar centroiding methods saturate the Cramér-Rao lower bound? Open
One of the most demanding tasks in astronomical image processing---in terms of precision---is the centroiding of stars. Upcoming large surveys are going to take images of billions of point sources, including many faint stars, with short ex…