Ellipticity analysis of the BOOMERanG CMB maps

V. G. Gurzadyan, P. A R Ade, P. De Bernardis, C. L. Bianco, J. J. Bock, A. Boscaleri, B. P. Crill, G. De Troia, K. Ganga, M. Giacometti, E. Hivon, V. V. Hristov, A. L. Kashin, A. E. Lange, S. Masi, Philip Mauskopf, T. Montroy, P. Natoli, C. B. Netterfield, E. PascaleF. Piacentini, G. Polenta, J. Ruhl

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The properties of the Cosmic Microwave Background (CMB) maps carry valuable cosmological information. Here we report the results of the analysis hot and cold CMB anisotropy spots in the BOOMERanG 150 GHz map in terms of number, area, ellipticity, vs. temperature threshold. We carried out this analysis for the map obtained by summing independent measurement channels (signal plus noise map) and for a comparison map (noise only map) obtained by differencing the same channels. The anisotropy areas (spots) have been identified for both maps for various temperature thresholds and a catalog of the spots has been produced. The orientation (obliquity) of the spots is random for both maps. We computed the mean elongation of spots obtained from the maps at a given temperature threshold using a simple estimator. We found that for the sum map there is a region of temperature thresholds where the average elongation is not dependent on the threshold. Its value is ∼ 2.3 for cold areas and ∼ 2.2 for hot areas. This is a non-trivial result. The bias of the estimator is ∼ + 0.4 for areas of size ≲ 30′, and smaller for larger areas. The presence of noise also biases the llipticity by ≲ + 0.3. These biases have not been subtracted in the results quoted above. The threshold independent and random obliquity behaviour in the sum map is stable against pointing reconstruction accuracy and noise level of the data, thus confirming that these are actual properties of the dataset. The data used here give a hint of high ellipticity for the largest spots. Analogous elongation properties of CMB anisotropies had been detected for COBE-DMR 4 year data. If this is due to geodesics mixing, it would point to a non zero curvature of the Universe.

Original languageEnglish (US)
Pages (from-to)1859-1873
Number of pages15
JournalInternational Journal of Modern Physics D
Volume12
Issue number10
DOIs
StatePublished - Dec 2003
Externally publishedYes

Fingerprint

Ellipticity
ellipticity
Microwave
microwaves
thresholds
Elongation
elongation
Anisotropy
anisotropy
obliquity
estimators
Background
microwave
analysis
temperature
Estimator
Cosmic Background Explorer satellite
curvature
Geodesic
catalogs

Keywords

  • Cosmic microwave background

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science
  • Mathematical Physics

Cite this

Gurzadyan, V. G., Ade, P. A. R., De Bernardis, P., Bianco, C. L., Bock, J. J., Boscaleri, A., ... Ruhl, J. (2003). Ellipticity analysis of the BOOMERanG CMB maps. International Journal of Modern Physics D, 12(10), 1859-1873. https://doi.org/10.1142/S0218271803004419

Ellipticity analysis of the BOOMERanG CMB maps. / Gurzadyan, V. G.; Ade, P. A R; De Bernardis, P.; Bianco, C. L.; Bock, J. J.; Boscaleri, A.; Crill, B. P.; De Troia, G.; Ganga, K.; Giacometti, M.; Hivon, E.; Hristov, V. V.; Kashin, A. L.; Lange, A. E.; Masi, S.; Mauskopf, Philip; Montroy, T.; Natoli, P.; Netterfield, C. B.; Pascale, E.; Piacentini, F.; Polenta, G.; Ruhl, J.

In: International Journal of Modern Physics D, Vol. 12, No. 10, 12.2003, p. 1859-1873.

Research output: Contribution to journalArticle

Gurzadyan, VG, Ade, PAR, De Bernardis, P, Bianco, CL, Bock, JJ, Boscaleri, A, Crill, BP, De Troia, G, Ganga, K, Giacometti, M, Hivon, E, Hristov, VV, Kashin, AL, Lange, AE, Masi, S, Mauskopf, P, Montroy, T, Natoli, P, Netterfield, CB, Pascale, E, Piacentini, F, Polenta, G & Ruhl, J 2003, 'Ellipticity analysis of the BOOMERanG CMB maps', International Journal of Modern Physics D, vol. 12, no. 10, pp. 1859-1873. https://doi.org/10.1142/S0218271803004419
Gurzadyan VG, Ade PAR, De Bernardis P, Bianco CL, Bock JJ, Boscaleri A et al. Ellipticity analysis of the BOOMERanG CMB maps. International Journal of Modern Physics D. 2003 Dec;12(10):1859-1873. https://doi.org/10.1142/S0218271803004419
Gurzadyan, V. G. ; Ade, P. A R ; De Bernardis, P. ; Bianco, C. L. ; Bock, J. J. ; Boscaleri, A. ; Crill, B. P. ; De Troia, G. ; Ganga, K. ; Giacometti, M. ; Hivon, E. ; Hristov, V. V. ; Kashin, A. L. ; Lange, A. E. ; Masi, S. ; Mauskopf, Philip ; Montroy, T. ; Natoli, P. ; Netterfield, C. B. ; Pascale, E. ; Piacentini, F. ; Polenta, G. ; Ruhl, J. / Ellipticity analysis of the BOOMERanG CMB maps. In: International Journal of Modern Physics D. 2003 ; Vol. 12, No. 10. pp. 1859-1873.
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AU - Gurzadyan, V. G.

AU - Ade, P. A R

AU - De Bernardis, P.

AU - Bianco, C. L.

AU - Bock, J. J.

AU - Boscaleri, A.

AU - Crill, B. P.

AU - De Troia, G.

AU - Ganga, K.

AU - Giacometti, M.

AU - Hivon, E.

AU - Hristov, V. V.

AU - Kashin, A. L.

AU - Lange, A. E.

AU - Masi, S.

AU - Mauskopf, Philip

AU - Montroy, T.

AU - Natoli, P.

AU - Netterfield, C. B.

AU - Pascale, E.

AU - Piacentini, F.

AU - Polenta, G.

AU - Ruhl, J.

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N2 - The properties of the Cosmic Microwave Background (CMB) maps carry valuable cosmological information. Here we report the results of the analysis hot and cold CMB anisotropy spots in the BOOMERanG 150 GHz map in terms of number, area, ellipticity, vs. temperature threshold. We carried out this analysis for the map obtained by summing independent measurement channels (signal plus noise map) and for a comparison map (noise only map) obtained by differencing the same channels. The anisotropy areas (spots) have been identified for both maps for various temperature thresholds and a catalog of the spots has been produced. The orientation (obliquity) of the spots is random for both maps. We computed the mean elongation of spots obtained from the maps at a given temperature threshold using a simple estimator. We found that for the sum map there is a region of temperature thresholds where the average elongation is not dependent on the threshold. Its value is ∼ 2.3 for cold areas and ∼ 2.2 for hot areas. This is a non-trivial result. The bias of the estimator is ∼ + 0.4 for areas of size ≲ 30′, and smaller for larger areas. The presence of noise also biases the llipticity by ≲ + 0.3. These biases have not been subtracted in the results quoted above. The threshold independent and random obliquity behaviour in the sum map is stable against pointing reconstruction accuracy and noise level of the data, thus confirming that these are actual properties of the dataset. The data used here give a hint of high ellipticity for the largest spots. Analogous elongation properties of CMB anisotropies had been detected for COBE-DMR 4 year data. If this is due to geodesics mixing, it would point to a non zero curvature of the Universe.

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