Synthetic simulations of the extragalactic sky seen by eROSITA I. Pre-launch selection functions from Monte-Carlo simulations

Show full item record



Permalink

http://hdl.handle.net/10138/249339

Citation

Clerc , N , Ramos-Ceja , M E , Ridl , J , Lamer , G , Brunner , H , Hofmann , F , Comparat , J , Pacaud , F , Käfer , F , Reiprich , T H , Merloni , A , Schmid , C , Brand , T , Wilms , J , Friedrich , P , Finoguenov , A , Dauser , T & Kreykenbohm , I 2018 , ' Synthetic simulations of the extragalactic sky seen by eROSITA I. Pre-launch selection functions from Monte-Carlo simulations ' , Astronomy & Astrophysics , vol. 617 , 92 . https://doi.org/10.1051/0004-6361/201732119

Title: Synthetic simulations of the extragalactic sky seen by eROSITA I. Pre-launch selection functions from Monte-Carlo simulations
Author: Clerc, N.; Ramos-Ceja, M. E.; Ridl, J.; Lamer, G.; Brunner, H.; Hofmann, F.; Comparat, J.; Pacaud, F.; Käfer, F.; Reiprich, T. H.; Merloni, A.; Schmid, C.; Brand, T.; Wilms, J.; Friedrich, P.; Finoguenov, A.; Dauser, T.; Kreykenbohm, I.
Contributor: University of Helsinki, Department of Physics
Date: 2018-09-25
Language: eng
Number of pages: 12
Belongs to series: Astronomy & Astrophysics
ISSN: 1432-0746
URI: http://hdl.handle.net/10138/249339
Abstract: Context. Studies of galaxy clusters provide stringent constraints on models of structure formation. Provided that selection effects are under control, large X-ray surveys are well suited to derive cosmological parameters, in particular those governing the dark energy equation of state. Aims. We forecast the capabilities of the all-sky eROSITA (extended ROentgen Survey with an Imaging Telescope Array) survey to be achieved by the early 2020s. We bring special attention to modelling the entire chain from photon emission to source detection and cataloguing. Methods. The selection function of galaxy clusters for the upcoming eROSITA mission is investigated by means of extensive and dedicated Monte-Carlo simulations. Employing a combination of accurate instrument characterisation and a state-of-the-art source detection technique, we determine a cluster detection efficiency based on the cluster fluxes and sizes. Results. Using this eROSITA cluster selection function, we find that eROSITA will detect a total of approximately 10(5) clusters in the extra-galactic sky. This number of clusters will allow eROSITA to put stringent constraints on cosmological models. We show that incomplete assumptions on selection effects, such as neglecting the distribution of cluster sizes, induce a bias in the derived value of cosmological parameters. Conclusions. Synthetic simulations of the eROSITA sky capture the essential characteristics impacting the next-generation galaxy cluster surveys and they highlight parameters requiring tight monitoring in order to avoid biases in cosmological analyses.
Subject: cosmological parameters
surveys
large-scale structure of Universe
X-rays: galaxies: clusters
cosmology: observations
methods: data analysis
GALAXY CLUSTER SURVEY
RAY-IMAGING OBSERVATIONS
X-RAY
SCALING RELATIONS
COSMOLOGICAL CONSTRAINTS
OBSERVED GROWTH
POWER SPECTRUM
NUMBER COUNTS
EVOLUTION
CATALOG
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
aa32119_17.pdf 3.477Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record