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dc.contributor.author
Berti, Maria
dc.contributor.author
Spinelli, Marta
dc.contributor.author
Viel, Matteo
dc.date.accessioned
2023-04-18T09:36:15Z
dc.date.available
2023-04-17T03:14:34Z
dc.date.available
2023-04-18T09:36:15Z
dc.date.issued
2023-05
dc.identifier.issn
0035-8711
dc.identifier.issn
1365-2966
dc.identifier.other
10.1093/mnras/stad685
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/608094
dc.description.abstract
The measurement of the large-scale distribution of neutral hydrogen in the late Universe, obtained with radio telescopes through the hydrogen 21 cm line emission, has the potential to become a key cosmological probe in the upcoming years. We explore the constraining power of 21 cm intensity mapping observations on the full set of cosmological parameters that describe the A CDM model. We assume a single-dish survey for the SKA Observatory and simulate the 21 cm linear power spectrum monopole and quadrupole within six redshift bins in the range z = 0.25-3. Forecasted constraints are computed numerically through Markov Chain Monte Carlo techniques. We extend the sampler COSMOMC by implementing the likelihood function for the 21 cm power spectrum multipoles. We assess the constraining power of the mock data set alone and combined with Planck 2018 CMB observations. We find that 21 cm multipoles observations alone are enough to obtain constraints on the cosmological parameters comparable with other probes. Combining the 21 cm data set with CMB observations results in significantly reduced errors on all the cosmological parameters. The strongest effect is on O(c)h(2) and H-0 , for which the error is reduced by almost a factor four. The percentage errors we estimate are O(c)h(2) = 0 . 25 percent and sH(0 )= 0 . 16 per cent , to be compared with the Planck only results O(c)h(2) = 0 . 99 per cent and sH(0 )= 0 . 79 per cent . We conclude that 21 cm SKAO observations will provide a competitive cosmological probe, complementary to CMB and, thus, pivotal for gaining statistical significance on the cosmological parameters constraints, allowing a stress test for the current cosmological model.
en_US
dc.language.iso
en
en_US
dc.publisher
Oxford University Press
en_US
dc.subject
cosmology:cosmological parameters
en_US
dc.subject
cosmology:large-scale structure of Universe
en_US
dc.subject
radio lines:general
en_US
dc.title
Multipole expansion for 21 cm intensity mapping power spectrum: Forecasted cosmological parameters estimation for the SKA observatory
en_US
dc.type
Journal Article
dc.date.published
2023-03-06
ethz.journal.title
Monthly Notices of the Royal Astronomical Society
ethz.journal.volume
521
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Mon. Not. R. Astron. Soc.
ethz.pages.start
3221
en_US
ethz.pages.end
3236
en_US
ethz.grant
AstroSignals: A New Window on the Universe, with the New Generation of Large Radio-Astronomy Facilities
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.grant.agreementno
193826
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Sinergia
ethz.date.deposited
2023-04-17T03:14:35Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2023-04-18T09:36:16Z
ethz.rosetta.lastUpdated
2024-02-02T21:41:53Z
ethz.rosetta.versionExported
true
ethz.COinS
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