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HALOS2020 SIGNED

Accurate halo masses in the precision cosmology era

Total Cost €

EC-Contrib. €

Partnership

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HALOS2020 project word cloud

Explore the words cloud of the HALOS2020 project. It provides you a very rough idea of what is the project "HALOS2020" about.

science thanks ruling pave efficient data fixed models improvement return signal host stacking kids scatter powerful inference exploration halos masses halo dark gravitational formalism stellar theoretical quality intrinsic net correlations mass tool training bayesian compare ing galaxies alternative dimensions age hydrodynamical hsc des population first surveys relation predictions secondary euclid constraints put simulations photometric hierarchical detecting lensing look galaxy robustness bins weak evolution infer corresponding receiving

Project "HALOS2020" data sheet

The following table provides information about the project.

Coordinator	UNIVERSITEIT LEIDEN Organization address address: RAPENBURG 70 city: LEIDEN postcode: 2311 EZ website: www.universiteitleiden.nl contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.
Coordinator Country	Netherlands [NL]
Total cost	165˙598 €
EC max contribution	165˙598 € (100%)
Programme	1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
Code Call	H2020-MSCA-IF-2017
Funding Scheme	MSCA-IF-EF-ST
Starting year	2018
Duration (year-month-day)	from 2018-09-01 to 2020-08-31

Partnership

Take a look of project's partnership.

#	participants	country	role	EC contrib. [€]
1	UNIVERSITEIT LEIDEN UNIVERSITEIT LEIDEN Organization address address: RAPENBURG 70 city: LEIDEN postcode: 2311 EZ website: www.universiteitleiden.nl contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.	NL (LEIDEN)	coordinator	165˙598.00

Map

Project objective

Weak gravitational lensing is a very powerful tool for investigating the relation between galaxies and their host dark matter halos. Thanks to current photometric surveys such as KiDS, DES and HSC, the quality of the data available for weak lensing studies is rapidly improving. However, there has not yet been a corresponding improvement in the methods used for the analysis of this data: most weak lensing studies are still carried out by stacking the signal in bins, resulting in a net loss of information. As an alternative to stacking, I have recently developed a new method to infer the distribution of halo masses of a population of galaxies with weak lensing data. The method, based on a Bayesian hierarchical inference formalism, allows for an easy exploration of correlations in many dimensions, and to directly constrain the intrinsic scatter in halo mass. In this project, I will use my method to look for correlations between halo mass and secondary galaxy properties at fixed stellar mass, such as the age of the stellar population, in KiDS data. I will first test the robustness of my method on hydrodynamical simulations. Then, after receiving a training on the most technical aspects of KiDS weak lensing measurements, I will apply it on real data. Finally, I will compare the results of my analysis with predictions from theoretical models. By detecting or ruling out correlations between halo mass and galaxy properties, I will be able to put powerful constraints on galaxy evolution models. This project will produce an immediate return in terms of science, and will pave the way for the use of more efficient analysis methods in future surveys such as Euclid.

Publications

List of publications.
year	authors and title	journal	last update
2019	Alessandro Sonnenfeld, Wenting Wang, Neta Bahcall Hyper Suprime-Cam view of the CMASS galaxy sample published pages: A30, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201834260	Astronomy & Astrophysics 622	2019-04-18

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The information about "HALOS2020" are provided by the European Opendata Portal: CORDIS opendata.