Extragalactic Radio Sources and the WMAP Cold Spot
By L. Rudnick, S. Brown, L. Williams. 2007
153 citations recorded by the source corpus.
We detect a dip of 20%-45% in the surface brightness and number counts of NRAO VLA Sky Survey (NVSS) sources smoothed to a few degrees at the location of the WMAP cold spot. The dip has structure on scales of ~1° to 10°. Together with independent all-sky wavelet analyses, our results suggest that the dip in extragalactic brightness and number counts and the WMAP cold spot are physically related, i.e., that the coincidence is neither a statistical anomaly nor a WMAP foreground-correction problem. If the cold spot does originate from structures at modest redshifts, as we suggest, then there is no remaining need for non-Gaussian processes at the last scattering surface of the cosmic microwave background (CMB) to explain the cold spot. The late integrated Sachs-Wolfe effect, already seen statistically for NVSS source counts, can now be seen to operate on a single region. To create the magnitude and angular size of the WMAP cold spot requires a ~140 Mpc radius completely empty void at z ≤ 1 along this line of sight. This is far outside the current expectations of the concordance cosmology, and adds to the anomalies seen in the CMB.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/a43d04444dbf536f54575bae4e530e951ed67f99
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In Astronomy and Astrophysics
- E. Komatsu
- A. Riess
- Mark Halpern
- C. Bennett
- David N. Spergel
- J. Weiland
- Gary F. Hinshaw
- Volker Springel
Citations in the corpus
- An Imprint of Superstructures on the Microwave Background due to the Integrated Sachs-Wolfe Effect (2008, background): “Our detection makes it more plausible that low-redshift supervoids and superclusters explain anomalies observed on the CMB (Rakić et al. 2006; Rudnick et al. 2007; Inoue & Silk 2007; Maturi et al. 2007).”
- SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP ) OBSERVATIONS: ARE THERE COSMIC MICROWAVE BACKGROUND ANOMALIES? (2010, background): “Rudnick et al. (2007) examined number counts and smoothed surface brightness in the NRAO VLA Sky Survey (NVSS) radio source data.”
- The Pantheon+ Analysis: Cosmological Constraints (2022, background): “Evidence for an underdensity aligned with the CMB cold spot was presented by Rudnick et al. (2007).”