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Large-scale fluctuations in the number density of galaxies in independent surveys of deep fields

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Abstract

New arguments supporting the reality of large-scale fluctuations in the density of the visible matter in deep galaxy surveys are presented. A statistical analysis of the radial distributions of galaxies in the COSMOS and HDF-N deep fields is presented. Independent spectral and photometric surveys exist for each field, carried out in different wavelength ranges and using different observing methods. Catalogs of photometric redshifts in the optical (COSMOS-Zphot) and infrared (UltraVISTA) were used for the COSMOS field in the redshift interval 0.1 < z < 3.5, as well as the zCOSMOS (10kZ) spectroscopic survey and the XMM-COSMOS and ALHAMBRA-F4 photometric redshift surveys. The HDFN-Zphot and ALHAMBRA-F5 catalogs of photometric redshifts were used for the HDF-N field. The Pearson correlation coefficient for the fluctuations in the numbers of galaxies obtained for independent surveys of the same deep field reaches R = 0.70 ± 0.16. The presence of this positive correlation supports the reality of fluctuations in the density of visible matter with sizes of up to 1000 Mpc and amplitudes of up to 20% at redshifts z ~ 2. The absence of correlations between the fluctuations in different fields (the correlation coefficient between COSMOS and HDF-N is R = −0.20 ± 0.31) testifies to the independence of structures visible in different directions on the celestial sphere. This also indicates an absence of any influence from universal systematic errors (such as “spectral voids”), which could imitate the detection of correlated structures.

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Authors and Affiliations

  1. Saint-Petersburg State University, University Embankment 7–9, St. Petersburg, 199034, Russia

    S. I. Shirokov, N. Yu. Lovyagin & Yu. V. Baryshev

  2. Saint-Petersburg State University of Architecture and Civil Engineering, St. Petersburg, Russia

    V. L. Gorokhov

Authors
  1. S. I. Shirokov
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  2. N. Yu. Lovyagin
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  3. Yu. V. Baryshev
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  4. V. L. Gorokhov
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Correspondence to S. I. Shirokov.

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Original Russian Text © S.I. Shirokov, N.Yu. Lovyagin, Yu.V. Baryshev, V.L. Gorokhov, 2016, published in Astronomicheskii Zhurnal, 2016, Vol. 93, No. 6, pp. 546–561.

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Shirokov, S.I., Lovyagin, N.Y., Baryshev, Y.V. et al. Large-scale fluctuations in the number density of galaxies in independent surveys of deep fields. Astron. Rep. 60, 563–578 (2016). https://doi.org/10.1134/S1063772916040107

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  • DOI: https://doi.org/10.1134/S1063772916040107

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