Repozytorium Uniwersytetu Jagiellońskiego
The VIMOS Public Extragalactic Redshift Survey (VIPERS) : \Omega _{m} _{0} from the galaxy clustering ratio measured at z \sim 1
The VIMOS Public Extragalactic Redshift Survey ...
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| tytuł: | The VIMOS Public Extragalactic Redshift Survey (VIPERS) : \Omega _{m} _{0} from the galaxy clustering ratio measured at z \sim 1 |
| autor: | Bel J., Marinoni C., Granett B. R., Guzzo L., Peacock J. A., Branchini E., Cucciati O., de la Torre S., Iovino A., Percival W. J., Steigerwald H., Abbas U., Adami C., Arnouts S., Bolzonella M., Bottini D., Cappi A., Coupon J., Davidzon I., De Lucia G., Fritz A., Franzetti P., Fumana M., Garilli B., Ilbert O., Krywult J., Le Brun V., Le Fèvre O., Maccagni D., Małek K., Marulli F., McCracken H. J., Paioro L., Polletta M., Pollo Agnieszka  , Schlagenhaufer H., Scodeggio M., Tasca L. A. M., Tojeiro R., Vergani D., Zanichelli A., Burden A., Di Porto C., Marchetti A., Mellier Y., Moscardini L., Nichol R. C., Phleps S., Wolk M., Zamorani G. |
| tytuł czasopisma: | Astronomy and Astrophysics |
| tom: | 563 |
| data wydania: | 2014 |
| article ID: | A37 |
| ISSN: |
0004-6361 |
| eISSN: |
1432-0746 |
| DOI: | |
| język: | angielski |
| język czasopisma: | angielski |
| abstrakt w j. angielskim: | We use a sample of about 22 000 galaxies at 0.65 < z < 1.2 from the VIMOS Public Extragalactic Redshift Survey (VIPERS) Public Data Release 1 (PDR-1) catalogue, to constrain the cosmological model through a measurement of the galaxy clustering ratio \eta _{g,R}. This statistic has favourable properties, which is defined as the ratio of two quantities characterizing the smoothed density field in spheres of a given radius R: the value of its correlation function on a multiple of this scale, \xi(nR), and its variance \sigma^{2}(R). For sufficiently large values of R, this is a universal number, which captures 2-point clustering information independently of the linear bias and linear redshift-space distortions of the specific galaxy tracers. In this paper, we discuss how to extend the application of \eta _{g,R} to quasi-linear scales and how to control and remove observational selection effects, which are typical of redshift surveys as VIPERS, in detail. We verify the accuracy and efficiency of these procedures using mock catalogues that match the survey selection process. These results show the robustness of \eta _{g,R} to non-linearities and observational effects, which is related to its very definition as a ratio of quantities that are similarly affected. At an effective redshift z = 0.93, we measured the value \eta _{g,R}(15) = 0.141 \pm 0.013 at R = 5h^{-1} Mpc. Within a flat \LambdaCDM cosmology and by including the best available priors on H_{0}, n_{s} and baryon density, we obtain a matter density parameter at the current epoch \Omega _{m,0} = 0.270_{-0.025}\, ^{+0.029}. In addition to the great precision achieved on our estimation of \Omega _{m} using VIPERS PDR-1, this result is remarkable because it appears to be in good agreement with a recent estimate at z ≃ 0.3, which was obtained by applying the same technique to the SDSS-LRG catalogue. It, therefore, supports the robustness of the present analysis. Moreover, the combination of these two measurements at z ~ 0.3 and z ~ 0.9 provides us with a very precise estimate of \Omega _{m,0} = 0.274 \pm 0.017, which highlights the great consistency between our estimation and other cosmological probes, such as baryonic acoustic oscillations, cosmic microwave background, and supernovae. |
| słowa kluczowe w j. angielskim: | cosmological parameters, dark matter, large-scale structure of Universe |
| wydział:instytut/zakład/katedra: | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne |
| typ: | artykuł w czasopiśmie |
| podtyp: | artykuł |
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