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Article: Reconstructed density and velocity fields from the 2MASS Redshift Survey

TitleReconstructed density and velocity fields from the 2MASS Redshift Survey
Authors
KeywordsGalaxies: distances and redshifts
Cosmology: observations
Surveys
Large-scale structure of Universe
Issue Date2006
Citation
Monthly Notices of the Royal Astronomical Society, 2006, v. 373, n. 1, p. 45-64 How to Cite?
AbstractWe present the reconstructed real-space density and the predicted velocity fields from the Two-Micron All-Sky Redshift Survey (2MRS). The 2MRS is the densest all-sky redshift survey to date and includes about 23 200 galaxies with extinction-corrected magnitudes brighter than K s = 11.25. Our method is based on the expansion of these fields in Fourier-Bessel functions. Within this framework, the linear redshift distortions only affect the density field in the radial direction and can easily be deconvolved using a distortion matrix. Moreover, in this coordinate system, the velocity field is related to the density field by a simple linear transformation. The shot noise errors in the reconstructions are suppressed by means of a Wiener filter which yields a minimum variance estimate of the density and velocity fields. Using the reconstructed real-space density fields, we identify all major superclusters and voids. At 50 h -1 Mpc, our reconstructed velocity field indicates a backside infall to the Great Attractor region of v infall = (491 ± 200) (β/0.5)kms -1 in the Local Group frame and v infall = (64 ± 205) (β/0.5)kms -1 in the cosmic microwave background (CMB) frame and β is the redshift distortion parameter. The direction of the reconstructed dipole agrees well with the dipole derived by Erdoǧdu et al. The misalignment between the reconstructed 2MRS and the CMB dipoles drops to 13° at around 5000 km s -1 but then increases at larger distances. © 2006 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/208861
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorErdoǧdu, Pirin-
dc.contributor.authorLahav, Ofer-
dc.contributor.authorHuchra, John P.-
dc.contributor.authorColless, Matthew-
dc.contributor.authorCutri, Roc M.-
dc.contributor.authorFalco, Emilio E.-
dc.contributor.authorGeorge, Teddy A.-
dc.contributor.authorJarrett, Thomas H M-
dc.contributor.authorJones, Daniel Heath-
dc.contributor.authorMacri, Lucas M.-
dc.contributor.authorMader, Jeff A.-
dc.contributor.authorMartimbeau, Nathalie-
dc.contributor.authorPahre, Michael A.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorRassat, Anaïs-
dc.contributor.authorSaunders, Will J.-
dc.date.accessioned2015-03-23T02:01:58Z-
dc.date.available2015-03-23T02:01:58Z-
dc.date.issued2006-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2006, v. 373, n. 1, p. 45-64-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208861-
dc.description.abstractWe present the reconstructed real-space density and the predicted velocity fields from the Two-Micron All-Sky Redshift Survey (2MRS). The 2MRS is the densest all-sky redshift survey to date and includes about 23 200 galaxies with extinction-corrected magnitudes brighter than K s = 11.25. Our method is based on the expansion of these fields in Fourier-Bessel functions. Within this framework, the linear redshift distortions only affect the density field in the radial direction and can easily be deconvolved using a distortion matrix. Moreover, in this coordinate system, the velocity field is related to the density field by a simple linear transformation. The shot noise errors in the reconstructions are suppressed by means of a Wiener filter which yields a minimum variance estimate of the density and velocity fields. Using the reconstructed real-space density fields, we identify all major superclusters and voids. At 50 h -1 Mpc, our reconstructed velocity field indicates a backside infall to the Great Attractor region of v infall = (491 ± 200) (β/0.5)kms -1 in the Local Group frame and v infall = (64 ± 205) (β/0.5)kms -1 in the cosmic microwave background (CMB) frame and β is the redshift distortion parameter. The direction of the reconstructed dipole agrees well with the dipole derived by Erdoǧdu et al. The misalignment between the reconstructed 2MRS and the CMB dipoles drops to 13° at around 5000 km s -1 but then increases at larger distances. © 2006 RAS.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectGalaxies: distances and redshifts-
dc.subjectCosmology: observations-
dc.subjectSurveys-
dc.subjectLarge-scale structure of Universe-
dc.titleReconstructed density and velocity fields from the 2MASS Redshift Survey-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2006.11049.x-
dc.identifier.scopuseid_2-s2.0-33750816705-
dc.identifier.volume373-
dc.identifier.issue1-
dc.identifier.spage45-
dc.identifier.epage64-
dc.identifier.eissn1365-2966-

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