G
Garrelt Mellema
Researcher at Stockholm University
Publications - 265
Citations - 12481
Garrelt Mellema is an academic researcher from Stockholm University. The author has contributed to research in topics: Reionization & Redshift. The author has an hindex of 61, co-authored 256 publications receiving 11372 citations. Previous affiliations of Garrelt Mellema include University of Manchester & University of Toronto.
Papers
More filters
Journal ArticleDOI
The kinematics of the planetary nebula BD+30 3639
Myfanwy Bryce,Garrelt Mellema +1 more
TL;DR: In this paper, the authors describe the results of the first optical kinematic study of the planetary nebula BD+30 3639, which has a central star of the Wolf-Rayet type and is believed to be fairly young.
Posted Content
Probing IGM Physics during Cosmic Dawn using the Redshifted 21-cm Bispectrum
Mohd Kamran,Suman Majumdar,Raghunath Ghara,Garrelt Mellema,Somnath Bharadwaj,Jonathan R. Pritchard,Rajesh Mondal,Ilian T. Iliev +7 more
TL;DR: In this article, the authors show that the evolution of the sign and magnitude of the 21-cm bispectrum can disentangle the contributions from Ly$\alpha$ coupling and X-ray heating of the IGM, the two most dominant processes which drive this transition.
A comparative study of disk-planet interaction
Miguel de Val-Borro,Richard G. Edgar,Pawel Artymowicz,P. Ciecilag,P. Cresswell,Genaro D'Angelo,Eduardo Delgado-Donate,G. Dirksen,Sebastien Fromang,A. Gawryszczak,Hubert Klahr,Willy Kley,Wladimir Lyra,Frédéric Masset,Garrelt Mellema,Richard P. Nelson,Simje-Jan Paardekooper,Adam Peplinski,A. Pierens,Tomasz Plewa,Ken Rice,Christoph Schäfer,Roland Speith +22 more
TL;DR: In this article, the authors performed numerical simulations of a disc-planet system using various grid-based and smoothed particle hydrodynamics (SPH) codes, and compared the surface density contours, potential vorticity and smooth radial profiles at several times.
Posted Content
General Relativistic Hydrodynamics with a Roe solver
Frits Eulderink,Garrelt Mellema +1 more
TL;DR: In this paper, a generalization of Roe's approximate Riemann solver for the non-relativistic Euler equations in Cartesian coordinates is presented, and applied to a set of standard test problems for general relativistic hydrodynamics.
Journal ArticleDOI
Redshifted 21-cm bispectrum: impact of the source models on the signal and the IGM physics from the Cosmic Dawn
Mohd Kamran,Raghunath Ghara,Suman Majumdar,Garrelt Mellema,S. Bharadwaj,Jonathan K. Pritchard,Rajesh Mondal,Ilian T. Iliev +7 more
TL;DR: In this article , the authors study the impact of variation in Lyα coupling and X-ray heating on the 21-cm bispectrum for all possible unique triangles in the Fourier domain, and show that the shape, sign and magnitude of the bispectrom jointly provide a better measure of the signal fluctuations and its non-Gaussianity than the power spectrum alone.