A unique tool for probing the structure of quasar accretion discs is quasar microlensing: the effect of compact stellar-mass object close to the line of sight of a multiply imaged quasar. This is best described by a magnification map (see figure) of the quasar plane. Generating such maps is a computationally demanding task, to which Graphics Processing Units (GPU) come to the rescue. We are going to need thousands of such maps to study quasars in the survey era of astronomy. To this goal, I have been carrying out the GERLUMPH parameter survey.
In the peta-scale era of astronomy, the traditional picture of working with data locally on the desktop, or even on a supercomputer, will have to be abandoned. We will have to push the computations to the data. I have created a series of eTools for the GERLUMPH survey, one of which is the light curve tool (click on image).
|•||Vohl, Fluke & Vernardos, Astronomy & Computing, 12, 200|
|"Data compression in the petascale astronomy era: A GERLUMPH case study"|
|•||Vernardos, Fluke, Bate, Croton & Vohl, ApJSS, 217, 23|
|"GERLUMPH Data Release 2: 2.5 billion simulated microlensing light curves"|
|•||Vernardos & Fluke, MNRAS, 445, 1223|
|"The effect of macromodel uncertainties on microlensing modelling of lensed quasars"|
|•||Vernardos & Fluke, Astronomy & Computing, 6, 1|
|"Adventures in the microlensing cloud: large datasets, eResearch tools, and GPUs"|
|•||Vernardos, Fluke, Bate & Croton, ApJSS, 211, 16|
|"GERLUMPH Data Release 1: High-resolution cosmological microlensing magnification maps and tools"|
|•||Vernardos & Fluke, MNRAS, 434, 832|
|"A new parameter space study of cosmological microlensing"|
|Phone:||+31 5 0363 4075|
|Email:||gvernard at astro.rug.nl|
A recent version of my CV can be found here.
(PDF format, updated on 23/04/2016)
The GERLUMPH project aims at preparing the theoretical ground for the data intensive era of quasar microlensing. The project is based at Swinburne University of Technology and its team members are:
For (much) more information visit the GERLUMPH website: