2–6 Sept 2019
Europe/Zurich timezone

Lensing of 21cm intensity mapping

3 Sept 2019, 17:00
15m

Speaker

Mrs Mona Jalilvand (University of Geneva)

Description

My talk has two parts. First, I talk about second-order lensing of 21cm intensity mapping (IM). Like the CMB, 21cm IM temperature fluctuations have second and higher order lensing and no first-order lensing. We find a new (third order) lensing term that is neglected in the CMB lensing but is important for 21cm IM. We study the detectability of 21cm IM lensing with a Fisher matrix approach for the redshift range of z=2 to z=6 and find that with optimistic assumptions, we obtain a signal-to-noise of ~10 for futuristic surveys like SKA2.
In the second part, I talk about our current project on estimating the first order lensing from cross-correlation of 21cm IM and galaxy clustering surveys. We introduce a new lensing estimator which has higher signal-to-noise compared to the estimator that is currently used for magnification bias detection.

Primary author

Mrs Mona Jalilvand (University of Geneva)

Presentation materials