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Reconstructed density and velocity fields from the 2MASS Redshift Survey

Erdoğdu, Pirin and Lahav, Ofer and Huchra, John P. and Colless, Matthew and Cutri, Roc M. and Falco, Emilio and George, Teddy and Jarrett, Thomas and Jones, D. Heath and Macri, Lucas M. and Mader, Jeff and Martimbeau, Nathalie and Pahre, Michael A. and Parker, Quentin A. and Rassat, Anaïs and Saunders, Will (2006) Reconstructed density and velocity fields from the 2MASS Redshift Survey. Monthly Notices of the Royal Astronomical Society, 373 (1). pp. 45-64. ISSN 0035-8711.

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We 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 Ks= 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 vinfall= (491 ± 200) (β/0.5) km s^−1 in the Local Group frame and vinfall= (64 ± 205) (β/0.5) km s^−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 Erdoğdu 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.

Item Type:Article
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URLURL TypeDescription
Colless, Matthew0000-0001-9552-8075
Cutri, Roc M.0000-0002-0077-2305
Jarrett, Thomas0000-0002-4939-734X
Additional Information:© 2006 The Authors. Journal compilation © 2006 RAS. Accepted 2006 September 4. Received 2006 August 30; in original form 2006 May 9. Published Online: 25 October 2006. Special thanks to Peter Coles, Yehuda Hoffman, Michelle Lanyon, Karen Masters and Chris Short for their valuable comments. PE would like to thank the University College London for its hospitality during the completion of this work. OL acknowledges a PPARC Senior Research Fellowship. JPH, LMM, CSK, NM and TJ are supported by NSF grant AST-0406906, and EF's research is partially supported by the Smithsonian Institution. DHJ is supported as a Research Associate by Australian Research Council Discovery-Projects Grant (DP-0208876), administered by the Australian National University. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has also made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration and the SIMBAD database, operated at CDS, Strasbourg, France.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Smithsonian InstitutionUNSPECIFIED
Australian Research CouncilDP-0208876
Australian National UniversityUNSPECIFIED
Subject Keywords:surveys • galaxies: distances and redshifts • cosmology: observations • large-scale structure of Universe
Issue or Number:1
Record Number:CaltechAUTHORS:ERDmnras06b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12999
Deposited By: Archive Administrator
Deposited On:15 Jan 2009 03:37
Last Modified:09 Mar 2020 13:18

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