SwePub
Sök i LIBRIS databas

  Utökad sökning

WFRF:(Kamphuis S)
 

Sökning: WFRF:(Kamphuis S) > The MeerKAT Absorpt...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00006167naa a2200637 4500
001oai:research.chalmers.se:473b1097-2e2e-4cb3-863c-2389b4fd379d
003SwePub
008230603s2023 | |||||||||||000 ||eng|
0247 a https://doi.org/10.1051/0004-6361/2022454772 DOI
0247 a https://research.chalmers.se/publication/5360632 URI
040 a (SwePub)cth
041 a engb eng
042 9 SwePub
072 7a art2 swepub-publicationtype
072 7a ref2 swepub-contenttype
1001 a Wagenveld, Jonah D.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut
2451 0a The MeerKAT Absorption Line Survey: Homogeneous continuum catalogues towards a measurement of the cosmic radio dipole
264 c 2023-03-30
264 1b EDP Sciences,c 2023
338 a electronic2 rdacarrier
520 a The number counts of homogeneous samples of radio sources are a tried and true method of probing the large-scale structure of the Universe, as most radio sources outside the Galactic plane are at cosmological distances. As such, they are expected to trace the cosmic radio dipole, an anisotropy analogous to the dipole seen in the cosmic microwave background (CMB). Results have shown that although the cosmic radio dipole matches the direction of the CMB dipole, it has a significantly larger amplitude. This unexplained result challenges our assumption of the Universe being isotropic, which can have large repercussions for the current cosmological paradigm. Though significant measurements have been made, sensitivity to the radio dipole is generally hampered by systematic effects that can cause large biases in the measurement. Here we assess these systematics with data from the MeerKAT Absorption Line Survey (MALS), a blind search for absorption lines with pointings centred on bright radio sources. With the sensitivity and field of view of MeerKAT, thousands of sources are observed in each pointing, allowing for the possibility of measuring the cosmic radio dipole given enough pointings. We present the analysis of ten MALS pointings, focusing on systematic effects that could lead to an inhomogeneous catalogue. We describe the calibration and creation of full band continuum images and catalogues, producing a combined catalogue containing 16 307 sources and covering 37.5 square degrees of sky down to a sensitivity of 10 μJy beam-1. We measure the completeness, purity, and flux recovery statistics for these catalogues using simulated data. We investigate different source populations in the catalogues by looking at flux densities and spectral indices and how they might influence source counts. Using the noise characteristics of the pointings, we find global measures that can be used to correct for the incompleteness of the catalogue, producing corrected number counts down to 100-200 μJy. We show that we can homogenise the catalogues and properly account for systematic effects. We determine that we can measure the dipole to 3significance with 100 MALS pointings.
650 7a NATURVETENSKAPx Fysikx Subatomär fysik0 (SwePub)103012 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Subatomic Physics0 (SwePub)103012 hsv//eng
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653 a Surveys
653 a Galaxies: statistics
653 a Radio continuum: galaxies
7001 a Klockner, H. R.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut
7001 a Gupta, N.u Inter-University Centre for Astronomy and Astrophysics (IUCAA)4 aut
7001 a Deka, Partha P.u Inter-University Centre for Astronomy and Astrophysics (IUCAA)4 aut
7001 a Jagannathan, P.u National Radio Astronomy Observatory Socorro4 aut
7001 a Sekhar, S.u University of the Western Cape,National Radio Astronomy Observatory Socorro4 aut
7001 a Balashev, S.u Russian Academy of Sciences,National Research University Higher School of Economics4 aut
7001 a Boettcher, Erinu NASA Goddard Space Flight Center,University of Maryland4 aut
7001 a Combes, Françoiseu Observatoire de Paris,Paris Observatory4 aut
7001 a Emig, K.L.u National Radio Astronomy Observatory4 aut
7001 a Hilton, M.u University of KwaZulu-Natal,University of Witwatersrand4 aut
7001 a Józsa, G. I.G.u Rhodes University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut
7001 a Kamphuis, Peteru Ruhr-Universität Bochum4 aut
7001 a Klutse, D.u University of KwaZulu-Natal4 aut
7001 a Knowles, K.u Rhodes University4 aut
7001 a Krogager, J. K.u Ruhr-Universität Bochum4 aut
7001 a Mohapatra, Abhiseku Inter-University Centre for Astronomy and Astrophysics (IUCAA)4 aut
7001 a Momjian, E.u National Radio Astronomy Observatory Socorro4 aut
7001 a Moodley, K.u University of KwaZulu-Natal4 aut
7001 a Muller, Sebastien,d 1976u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)mullers
7001 a Petitjean, Patricku Centre national de la recherche scientifique (CNRS)4 aut
7001 a Salas, P.u Green Bank Observatory4 aut
7001 a Sikhosana, S.u University of KwaZulu-Natal4 aut
7001 a Srianand, R.u Inter-University Centre for Astronomy and Astrophysics (IUCAA)4 aut
7102 a Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG)b Inter-University Centre for Astronomy and Astrophysics (IUCAA)4 org
7730 t Astronomy and Astrophysicsd : EDP Sciencesg 673q 673x 0004-6361x 1432-0746
8564 u https://research.chalmers.se/publication/536063/file/536063_Fulltext.pdfx primaryx freey FULLTEXT
8564 8u https://doi.org/10.1051/0004-6361/202245477
8564 8u https://research.chalmers.se/publication/536063

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy