Data di Pubblicazione:
2015
Citazione:
The VIMOS Public Extragalactic Redshift Survey (VIPERS): Hierarchical scaling and biasing / A. Cappi, F. Marulli, J. Bel, O. Cucciati, E. Branchini, S. De La Torre, L. Moscardini, M. Bolzonella, L. Guzzo, U. Abbas, C. Adami, S. Arnouts, D. Bottini, J. Coupon, I. Davidzon, G. De Lucia, A. Fritz, P. Franzetti, M. Fumana, B. Garilli, B.R. Granett, O. Ilbert, A. Iovino, J. Krywult, V. Le Brun, O. Le Fèvre, D. Maccagni, K. Małek, H.J. Mccracken, L. Paioro, M. Polletta, A. Pollo, M. Scodeggio, L.A.M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, A. Burden, C. Di Porto, A. Marchetti, C. Marinoni, Y. Mellier, R.C. Nichol, J.A. Peacock, W.J. Percival, S. Phleps, C. Schimd, H. Schlagenhaufer, M. Wolk, G. Zamorani. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 579(2015), p. A70.A70. [10.1051/0004-6361/201525727]
Abstract:
Aims. Building on the two-point correlation function analyses of the VIMOS Public Extragalactic Redshift Survey (VIPERS), we investigate the higher-order correlation properties of the same galaxy samples to test the hierarchical scaling hypothesis at z ∼ 1 and the dependence on galaxy luminosity, stellar mass, and redshift. With this work we also aim to assess possible deviations from the linearity of galaxy bias independently from a previously performed analysis of our survey. Methods. We have measured the count probability distribution function in spherical cells of varying radii (3 ≤ R ≤ 10h -1 Mpc), deriving σ 8g (the galaxy rms at 8 h -1 Mpc), the volume-averaged two-, three-, and four-point correlation functions and the normalized skewness S3g and kurtosis S4g for different volume-limited subsamples, covering the following ranges: -19.5 ≤ MB(z = 1.1) - 5log(h) ≤ -21.0 in absolute magnitude, 9.0 ≤ log(M∗ /M⊙ h-2) ≤ 11.0 in stellar mass, and 0.5 ≤ z ≤ 1.1 in redshift. Results. We have performed the first measurement of high-order correlation functions at z ∼ 1 in a spectroscopic redshift survey. Our main results are the following. 1) The hierarchical scaling between the volume-averaged two- and three-point and two- and four-point correlation functions holds throughout the whole range of scale and redshift we could test. 2) We do not find a significant dependence of S 3g on luminosity (below z = 0.9 the value of S3g decreases with luminosity, but only at 1σ-level). 3) We do not detect a significant dependence of S3g and S4g on scale, except beyond z ∼ 0.9, where S3g and S4g have higher values on large scales (R 10 h -1 Mpc): this increase is mainly due to one of the two CFHTLS Wide Fields observed by VIPERS and can be explained as a consequence of sample variance, consistently with our analysis of mock catalogs. 4) We do not detect a significant evolution of S 3g and S4g with redshift (apart from the increase of their values with scale in the last redshift bin). 5) σ 8g increases with luminosity, but does not show significant evolution with redshift. As a consequence, the linear bias factor b = σ 8g /σ 8m , where σ8m is the rms of matter at a scale of 8 h -1 Mpc, increases with redshift, in agreement with the independent analysis of VIPERS and of other surveys such as the VIMOS-VLT Deep Survey (VVDS). We measure the lowest bias b = 1.47 ± 0.18 for galaxies with MB (z = 1.1) - 5 log(h) ≤ -19.5 in the first redshift bin (0.5 ≤ z ≤ 0.7) and the highest bias b = 2.12 ± 0.28 for galaxies with MB(z = 1.1) - 5 log(h) ≤ -21.0 in the last redshift bin (0.9 ≤ z ≤ 1.1).6) We quantify deviations from the linear bias by means of the Taylor expansion parameter b2 . We obtain b2 = -0.20 ± 0.49 for 0.5 ≤ z 0.7 and b2 = -0.24 ± 0.35 for 0.7 ≤ z ≤ 0.9, while for the redshift range 0.9 ≤ z < 1.1 we find b2 = +0.78 ± 0.82. These results are compatible with a null non-linear bias term, but taking into account another analysis for VIPERS and the analysis of other surveys, we argue that there is evidence for a small but non-zero non-linear bias term.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Cosmology: observations; Dark matter; Galaxies: statistics; Large-scale structure of Universe; Astronomy and Astrophysics; Space and Planetary Science
Elenco autori:
A. Cappi, F. Marulli, J. Bel, O. Cucciati, E. Branchini, S. De La Torre, L. Moscardini, M. Bolzonella, L. Guzzo, U. Abbas, C. Adami, S. Arnouts, D. Bottini, J. Coupon, I. Davidzon, G. De Lucia, A. Fritz, P. Franzetti, M. Fumana, B. Garilli, B.R. Granett, O. Ilbert, A. Iovino, J. Krywult, V. Le Brun, O. Le Fèvre, D. Maccagni, K. Małek, H.J. Mccracken, L. Paioro, M. Polletta, A. Pollo, M. Scodeggio, L.A.M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, A. Burden, C. Di Porto, A. Marchetti, C. Marinoni, Y. Mellier, R.C. Nichol, J.A. Peacock, W.J. Percival, S. Phleps, C. Schimd, H. Schlagenhaufer, M. Wolk, G. Zamorani
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