The non-gaussian cold spot in wmap: significance, morphology and foreground contribution - INSPIRE

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The non-gaussian cold spot in wmap: significance, morphology and foreground contribution

M. Cruz
(
- Cantabria Inst. of Phys. and
- Cantabria U., Santander
)
,
M. Tucci
(
- Imperial Coll., London
)
,
E. Martinez-Gonzalez
(
- Cantabria Inst. of Phys.
)
,
P. Vielva
(
- Cantabria Inst. of Phys.
)

Jan, 2006

11 pages

Published in:

Mon.Not.Roy.Astron.Soc. 369 (2006) 57-67

e-Print:

astro-ph/0601427 [astro-ph]

DOI:

10.1111/j.1365-2966.2006.10312.x

View in:

ADS Abstract Service

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Abstract: (arXiv)

The non--Gaussian cold spot in the 1-year WMAP data, described in Vielva et al. and Cruz et al., is analysed in detail in the present paper. First of all, we perform a more rigorous calculation of the significance of the non-zero kurtosis detected in WMAP maps by Vielva et al. in wavelet space, mainly generated by the Spot. We confirm the robustness of that detection, since the probability of obtaining this deviation by chance is 0.69%. Afterwards, the morphology of the Spot is studied by applying Spherical Mexican Hat Wavelets with different ellipticities. The shape of the Spot is found to be almost circular. Finally, we discuss if the observed non-Gaussianity in wavelet space can arise from bad subtracted foreground residues in the WMAP maps. We show that the flat frequency dependence of the Spot cannot be explained by a thermal Sunyaev-Zeldovich effect. Based on our present knowledge of Galactic foreground emissions, we conclude that the significance of our detection is not affected by Galactic residues in the region of the Spot. Considering different Galactic foreground estimates, the probability of finding such a big cold spot in Gaussian simulations is always below 1%.

methods: data analysis
cosmic microwave background

References(52)

Figures(0)

A Catalog of rich clusters of galaxies

George O. Abell
(
- Texas U., McDonald Observ. and
- Oklahoma U. and
- St. Mary's Coll.
)
,
Harold G Corwin, Jr.
(
- Texas U., McDonald Observ. and
- Oklahoma U. and
- St. Mary's Coll.
)
,
Ronald P. Olowin
(
- Texas U., McDonald Observ. and
- Oklahoma U. and
- St. Mary's Coll.
)

- Astrophys.J.Suppl. 70 (1989) 1
•
DOI:
- 10.1086/191333

Non-Gaussianity from inflation: Theory and observations

N. Bartolo
(
- Sussex U., Astron. Ctr.
)
,
E. Komatsu
(
- Texas U., Astron. Dept.
)
,
Sabino Matarrese
(
- Padua U. and
- INFN, Padua
)
,
A. Riotto
(
- INFN, Padua
)

- Phys.Rept. 402 (2004) 103-266
•
e-Print:
- astro-ph/0406398
•
DOI:
- 10.1016/j.physrep.2004.08.022

First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Preliminary maps and basic results

WMAP

Collaboration

•

C.L. Bennett

et al.

- Astrophys.J.Suppl. 148 (2003) 1-27
•
e-Print:
- astro-ph/0302207
•
DOI:
- 10.1086/377253

First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Foreground emission

WMAP

Collaboration

•

C. Bennett

et al.

- Astrophys.J.Suppl. 148 (2003) 97
•
e-Print:
- astro-ph/0302208
•
DOI:
- 10.1086/377252

A Polarized synchrotron template for CMBP experiments after WMAP data

Gianni Bernardi
(
- IASF, Bologna and
- Bologna U. and
- Australia, CSIRO, Epping
)
,
E. Carretti
(
- IASF, Bologna
)
,
R. Fabbri
(
- Florence U.
)
,
C. Sbarra
(
- IASF, Bologna
)
,
S. Poppi
(
- Bologna, Ist. Radioastronomia
)

et al.

- Mon.Not.Roy.Astron.Soc. 351 (2004) 436
•
e-Print:
- astro-ph/0403308
•
DOI:
- 10.1111/j.1365-2966.2004.07797.x

- Astrophys.J. 635 750B

Primordial non-gaussianity: local curvature method and statistical significance of constraints on f_nl from wmap data

Paolo Cabella
(
- Rome U., Tor Vergata
)
,
M. Liguori
(
- Padua U. and
- INFN, Padua
)
,
F.K. Hansen
(
- Rome U., Tor Vergata
)
,
D. Marinucci
(
- Rome U., Tor Vergata
)
,
S. Matarrese
(
- Padua U. and
- INFN, Padua
)

et al.

- Mon.Not.Roy.Astron.Soc. 358 (2005) 684-692
•
e-Print:
- astro-ph/0406026
•
DOI:
- 10.1111/j.1365-2966.2005.08833.x

Higher criticism statistic: Detecting and identifying non-Gaussianity in the WMAP first year data

- Mon.Not.Roy.Astron.Soc. 362 (2005) 826-832
•
e-Print:
- astro-ph/0507246
•
DOI:
- 10.1111/j.1365-2966.2005.09277.x

- Astrophys.J. 590 65

Auto and cross correlation of phases of the whole-sky CMB and foreground maps from the 1-year WMAP data

Lung-Yih Chiang
(
- Bohr Inst.
)
,
Pavel D. Naselsky
(
- Bohr Inst. and
- Southern Federal U.
)

- Int.J.Mod.Phys.D 15 (2006) 1283-1298
•
e-Print:
- astro-ph/0407395
•
DOI:
- 10.1142/S0218271806008759

Phase correlations in cosmic microwave background temperature maps

- Mon.Not.Roy.Astron.Soc. 350 (2004) 3, 989-1004
•
e-Print:
- astro-ph/0310252
•
DOI:
- 10.1111/j.1365-2966.2004.07706.x

The state of the universe

P. Coles
(
- Nottingham U.
)

- Nature 433 (2005) 248-256
•
DOI:
- 10.1038/nature03282

Multipole vectors - A New representation of the CMB sky and evidence for statistical anisotropy or non-Gaussianity at 2 <= l <= 8

Craig J. Copi
(
- Case Western Reserve U.
)
,
Dragan Huterer
(
- Case Western Reserve U.
)
,
Glenn D. Starkman
(
- CERN and
- Case Western Reserve U.
)

- Phys.Rev.D 70 (2004) 043515
•
e-Print:
- astro-ph/0310511
•
DOI:
- 10.1103/PhysRevD.70.043515

On the large-angle anomalies of the microwave sky

Craig J. Copi
(
- Case Western Reserve U.
)
,
D. Huterer
(
- Chicago U., KICP and
- Chicago U., Astron. Astrophys. Ctr.
)
,
D.J. Schwarz
(
- Bielefeld U.
)
,
G.D. Starkman
(
- Case WEstern Reserve U.
)

- Mon.Not.Roy.Astron.Soc. 367 (2006) 79-102
•
e-Print:
- astro-ph/0508047
•
DOI:
- 10.1111/j.1365-2966.2005.09980.x

Detection of a non-gaussian spot in wmap

- Mon.Not.Roy.Astron.Soc. 356 (2005) 29-40
•
e-Print:
- astro-ph/0405341
•
DOI:
- 10.1111/j.1365-2966.2004.08419.x

Towards a free-free template for CMB foregrounds

C. Dickinson
(
- Manchester U., NRAL
)
,
R.D. Davies
(
- Manchester U., NRAL
)
,
R.J. Davis
(
- Manchester U., NRAL
)

- Mon.Not.Roy.Astron.Soc. 341 (2003) 369
•
e-Print:
- astro-ph/0302024
•
DOI:
- 10.1046/j.1365-8711.2003.06439.x

Multivariate non-normality in the wmap 1st year data

Patrick Dineen
(
- Imperial Coll., London and
- Nottingham U.
)
,
Peter Coles
(
- Nottingham U.
)

e-Print:
- astro-ph/0511802

Topological defects in cosmology

R. Durrer
(
- Geneva U.
)

- New Astron.Rev. 43 (1999) 111-156
•
DOI:
- 10.1016/S1387-6473(99)00008-1

The N-point correlation functions of the first-year Wilkinson Microwave Anisotropy Probe sky maps

Hans Kristian Eriksen
(
- Inst. Theor. Astrophys., Oslo and
- Oslo U. and
- Caltech, JPL and
- Caltech
)
,
A.J. Banday
(
- Garching, Max Planck Inst.
)
,
K.M. Gorski
(
- Caltech, JPL and
- Warsaw U. Observ. and
- Caltech
)
,
P.B. Lilje
(
- Inst. Theor. Astrophys., Oslo and
- Oslo U.
)

- Astrophys.J. 622 (2005) 58-71
•
e-Print:
- astro-ph/0407271
•
DOI:
- 10.1086/427897

Testing for non-Gaussianity in the WMAP data: Minkowski functionals and the length of the skeleton

Hans Kristian Eriksen
(
- Inst. Theor. Astrophys., Oslo and
- Oslo U.
)
,
D.I. Novikov
(
- Inst. Theor. Astrophys., Oslo
)
,
P.B. Lilje
(
- Inst. Theor. Astrophys., Oslo and
- Oslo U.
)
,
A.J. Banday
(
- Garching, Max Planck Inst.
)
,
K.M. Gorski
(
- Caltech, JPL and
- Warsaw U. Observ.
)

- Astrophys.J. 612 (2004) 64-80
•
e-Print:
- astro-ph/0401276
•
DOI:
- 10.1086/422570

Extrapolation of galactic dust emission at 100 microns to CMBR frequencies using FIRAS

- Astrophys.J. 524 (1999) 867-886
•
e-Print:
- astro-ph/9905128
•
DOI:
- 10.1086/307852

A Full - sky H-alpha template for microwave foreground prediction

Douglas P. Finkbeiner
(
- Princeton U.
)

- Astrophys.J.Suppl. 146 (2003) 407
•
e-Print:
- astro-ph/0301558
•
DOI:
- 10.1086/374411

Examining the effect of the map-making algorithm on observed power asymmetry in wmap data

Peter E. Freeman
(
- Carnegie Mellon U.
)
,
C.R. Genovese
(
- Carnegie Mellon U.
)
,
C.J. Miller
(
- NOAO, Tucson
)
,
R.C. Nichol
(
- Portsmouth U., ICG
)
,
L. Wasserman
(
- Carnegie Mellon U.
)

- Astrophys.J. 638 (2006) 1-19
•
e-Print:
- astro-ph/0510406
•
DOI:
- 10.1086/498856

HEALPix - A Framework for high resolution discretization, and fast analysis of data distributed on the sphere

et al.

- Astrophys.J. 622 (2005) 759-771
•
e-Print:
- astro-ph/0409513
•
DOI:
- 10.1086/427976

Asymmetries in the local curvature of the WMAP data

Frode K. Hansen
(
- Rome U., Tor Vergata
)
,
Paolo Cabella
(
- Rome U., Tor Vergata
)
,
Domenico Marinucci
(
- Rome U., Tor Vergata
)
,
Nicola Vittorio
(
- Rome U., Tor Vergata and
- INFN, Rome
)

- Astrophys.J.Lett. 607 (2004) L67-L70
•
e-Print:
- astro-ph/0402396
•
DOI:
- 10.1086/421904

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