تقرير
Supervoid Origin of the Cold Spot in the Cosmic Microwave Background
| العنوان: | Supervoid Origin of the Cold Spot in the Cosmic Microwave Background |
|---|---|
| المؤلفون: | Kovács, András, Szapudi, István, Granett, Benjamin R., Frei, Zsolt, Silk, Joseph, Burgett, Will, Cole, Shaun, Draper, Peter W., Farrow, Daniel J., Kaiser, Nicholas, Magnier, Eugene A., Metcalfe, Nigel, Morgan, Jeffrey S., Price, Paul, Tonry, John, Wainscoat, Richard |
| سنة النشر: | 2014 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We use a WISE-2MASS-Pan-STARRS1 galaxy catalog to search for a supervoid in the direction of the Cosmic Microwave Background Cold Spot. We obtain photometric redshifts using our multicolor data set to create a tomographic map of the galaxy distribution. The radial density profile centred on the Cold Spot shows a large low density region, extending over 10's of degrees. Motivated by previous Cosmic Microwave Background results, we test for underdensities within two angular radii, $5^\circ$, and $15^\circ$. Our data, combined with an earlier measurement by Granett et al 2010, are consistent with a large $R_{\rm void}=(192 \pm 15)h^{-1} Mpc $ $(2\sigma)$ supervoid with $\delta \simeq -0.13 \pm 0.03$ centered at $z=0.22\pm0.01$. Such a supervoid, constituting a $\sim3.5 \sigma$ fluctuation in the $\Lambda CDM$ model, is a plausible cause for the Cold Spot. Comment: 4 pages, 2 figures, Proceedings of IAU 306 Symposium: Statistical Challenges in 21st Century Cosmology |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1407.1470 |
| رقم الأكسشن: | edsarx.1407.1470 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |