TexasScholarWorks
    • Login
    • Submit
    View Item 
    •   Repository Home
    • UT Faculty/Researcher Works
    • UT Faculty/Researcher Works
    • View Item
    • Repository Home
    • UT Faculty/Researcher Works
    • UT Faculty/Researcher Works
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Sky Maps, Systematic Errors, and Basic Results

    Thumbnail
    View/Open
    2011_02_Jarosik.pdf (1.990Mb)
    Date
    2011-02
    Author
    Jarosik, N.
    Bennett, C. L.
    Dunkley, J.
    Gold, B.
    Greason, M. R.
    Halpern, M.
    Hill, R. S.
    Hinshaw, G.
    Kogut, A.
    Komatsu, Eiichiro
    Larson, D.
    Limon, M.
    Meyer, S. S.
    Nolta, M. R.
    Odegard, N.
    Page, L.
    Smith, K. M.
    Spergel, D. N.
    Tucker, G. S.
    Weiland, J. L.
    Wollack, E.
    Wright, E. L.
    Share
     Facebook
     Twitter
     LinkedIn
    Metadata
    Show full item record
    Abstract
    New full-sky temperature and polarization maps based on seven years of data from WMAP are presented. The new results are consistent with previous results, but have improved due to reduced noise from the additional integration time, improved knowledge of the instrument performance, and improved data analysis procedures. The improvements are described in detail. The seven-year data set is well fit by a minimal six-parameter flat Lambda CDM model. The parameters for this model, using the WMAP data in conjunction with baryon acoustic oscillation data from the Sloan Digital Sky Survey and priors on H-0 from Hubble Space Telescope observations, are Omega(b)h(2) = 0.02260 +/- 0.00053, Omega(c)h(2) = 0.1123 +/- 0.0035, Omega(Lambda) = 0.728(-0.016)(+0.015), n(s) = 0.963 +/- 0.012, tau = 0.087 +/- 0.014, and sigma(8) = 0.809 +/- 0.024 (68% CL uncertainties). The temperature power spectrum signal-to-noise ratio per multipole is greater that unity for multipoles l less than or similar to 919, allowing a robust measurement of the third acoustic peak. This measurement results in improved constraints on the matter density, Omega(m)h(2) = 0.1334(-0.0055)(+0.0056), and the epoch of matter-radiation equality, z(eq) = 3196(-133)(+134), using WMAP data alone. The new WMAP data, when combined with smaller angular scale microwave background anisotropy data, result in a 3 sigma detection of the abundance of primordial helium, Y-He = 0.326 +/- 0.075. When combined with additional external data sets, the WMAP data also yield better determinations of the total mass of neutrinos, Sigma m(nu) <= 0.58 eV (95% CL), and the effective number of neutrino species, N-eff = 4.34(-0.88)(+0.86). The power-law index of the primordial power spectrum is now determined to be n(s) = 0.963 +/- 0.012, excluding the Harrison-Zel'dovich-Peebles spectrum by >3 sigma. These new WMAP measurements provide important tests of big bang cosmology.
    Department
    Astronomy
    Subject
    cosmic background radiation
    space vehicles: instruments
    window functions
    power spectrum
    beam profiles
    design
    polarization
    limits
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43001
    xmlui.dri2xhtml.METS-1.0.item-citation
    Jarosik, N., C. L. Bennett, J. Dunkley, B. Gold, M. R. Greason, M. Halpern, R. S. Hill et al. "SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP WMAP is the result of a partnership between Princeton University and NASA's Goddard Space Flight Center. Scientific guidance is provided by the WMAP Science Team.) OBSERVATIONS: SKY MAPS, SYSTEMATIC ERRORS, AND BASIC RESULTS." The Astrophysical Journal Supplement Series 192, no. 2 (Feb., 2011): 14.
    Collections
    • UT Faculty/Researcher Works

    University of Texas at Austin Libraries
    • facebook
    • twitter
    • instagram
    • youtube
    • CONTACT US
    • MAPS & DIRECTIONS
    • JOB OPPORTUNITIES
    • UT Austin Home
    • Emergency Information
    • Site Policies
    • Web Accessibility Policy
    • Web Privacy Policy
    • Adobe Reader
    Subscribe to our NewsletterGive to the Libraries

    © The University of Texas at Austin

     

     

    Browse

    Entire RepositoryCommunities & CollectionsDate IssuedAuthorsTitlesSubjectsDepartmentsThis CollectionDate IssuedAuthorsTitlesSubjectsDepartments

    My Account

    Login

    Statistics

    View Usage Statistics

    Information

    About Contact Policies Getting Started Glossary Help FAQs

    University of Texas at Austin Libraries
    • facebook
    • twitter
    • instagram
    • youtube
    • CONTACT US
    • MAPS & DIRECTIONS
    • JOB OPPORTUNITIES
    • UT Austin Home
    • Emergency Information
    • Site Policies
    • Web Accessibility Policy
    • Web Privacy Policy
    • Adobe Reader
    Subscribe to our NewsletterGive to the Libraries

    © The University of Texas at Austin