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Synthetic simulations of the extragalactic sky seen by eROSITA
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 617, pp.A92. ⟨10.1051/0004-6361/201732119⟩, Astronomy and Astrophysics-A&A, 2018, 617, pp.A92. ⟨10.1051/0004-6361/201732119⟩
- Publication Year :
- 2018
- Publisher :
- arXiv, 2018.
-
Abstract
- 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. We forecast the capabilities of the all-sky eROSITA (the extended ROentgen Survey with an Imaging Telescope Array) survey to be achieved by the early 2020s. We bring special attention to modeling the entire chain from photon emission to source detection and cataloguing. 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 characterization and of state-of-the-art source detection technique, we determine a cluster detection efficiency based on the cluster fluxes and sizes. Using this eROSITA cluster selection function, we find that eROSITA will detect a total of $\sim 10^5$ 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. 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.<br />Comment: Accepted in A&A. Image quality degraded for arXiv submission
- Subjects :
- COSMOLOGICAL CONSTRAINTS
OBSERVED GROWTH
Structure formation
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
POWER SPECTRUM
media_common.quotation_subject
Monte Carlo method
FOS: Physical sciences
Context (language use)
Astrophysics
GALAXY CLUSTER SURVEY
Astrophysics::Cosmology and Extragalactic Astrophysics
SCALING RELATIONS
01 natural sciences
law.invention
Telescope
surveys
law
RAY-IMAGING OBSERVATIONS
0103 physical sciences
Cluster (physics)
cosmological parameters
NUMBER COUNTS
010303 astronomy & astrophysics
Galaxy cluster
media_common
Physics
010308 nuclear & particles physics
Astronomy and Astrophysics
115 Astronomy, Space science
methods: data analysis
CATALOG
EVOLUTION
Space and Planetary Science
Sky
X-rays: galaxies: clusters
cosmology: observations
Dark energy
X-RAY
large-scale structure of Universe
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 617, pp.A92. ⟨10.1051/0004-6361/201732119⟩, Astronomy and Astrophysics-A&A, 2018, 617, pp.A92. ⟨10.1051/0004-6361/201732119⟩
- Accession number :
- edsair.doi.dedup.....fc9a67197e7d63d7dda71f3ca86f7873
- Full Text :
- https://doi.org/10.48550/arxiv.1806.08652