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
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Proceedings ArticleDOI
The Theory and Simulation of the 21‐cm Background from the Epoch of Reionization
TL;DR: The redshifted 21 cm line of distant neutral H atoms provides a probe of the cosmic dark ages and the epoch of reionization (EOR) which ended them, within the first billion years of cosmic time.
Journal ArticleDOI
A numerical study of 21-cm signal suppression and noise increase in direction-dependent calibration of LOFAR data
Maaijke Mevius,F. Mertens,F. Mertens,Léon V. E. Koopmans,A. R. Offringa,Sarod Yatawatta,Michiel A. Brentjens,Emma Chapman,Benedetta Ciardi,H. Gan,B. K. Gehlot,Raghunath Ghara,Raghunath Ghara,Abhik Ghosh,Sambit K. Giri,Ilian T. Iliev,Garrelt Mellema,V. N. Pandey,Saleem Zaroubi,Saleem Zaroubi,Saleem Zaroubi +20 more
TL;DR: In this paper, the authors investigate systematic effects in direction dependent gain calibration in the context of the Low-Frequency Array (LOFAR) 21 cm Epoch of Reionization (EoR) experiment.
Book ChapterDOI
Hydrodynamic Collimation of YSO Jets
Adam Frank,Garrelt Mellema +1 more
TL;DR: In this paper, numerical hydrodynamic models for the collimation of outflows from young stellar objects were presented, showing that the presence of a toroidal environment can lead to efficient formation of jets and bipolar outflows, and that the interaction between the wind and the environment leads to two types of collimation, one dominated by radiative cooling effects, and one which works when cooling is less efficient.
Journal ArticleDOI
Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys
Dijana Vrbanec,Benedetta Ciardi,Vibor Jelić,Hannes Jensen,Ilian T. Iliev,Garrelt Mellema,Saleem Zaroubi,Saleem Zaroubi,Saleem Zaroubi +8 more
TL;DR: In this paper, the authors used radiative transfer+N-body simulations to explore the feasibility of measurements of cross-correlations between the 21-cm field observed by the Square Kilometre Array (SKA) and high-z Lyman alpha emitters (LAEs) detected in galaxy surveys with the Subaru Hyper Suprime-Cam (HSC), Subaru Prime Focus Spectrograph (PFS), and Wide Field Infrared Survey Telescope (WFIRST).
Journal ArticleDOI
The Interaction of Stellar Winds with Their Environment: Theory and Modelling
TL;DR: In this paper, the basic difference between radiative and adiabatic bubbles, the effects a central photo-ionizing source may have and in some more detail how these concepts can be used to explain the formation of planetary Nebulae.