Testing cosmology with a catalogue of voids in the BOSS galaxy surveys

Seshadri Nadathur

Research output: Contribution to journalArticlepeer-review

91 Downloads (Pure)

Abstract

We present a public catalogue of voids in the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 11 LOWZ and CMASS galaxy surveys. This catalogue contains information on the location, sizes, densities, shapes and bounding surfaces of 8956 independent, disjoint voids, making it the largest public void catalogue to date. Voids are identified using a version of the ZOBOV algorithm, the operation of which has been calibrated though tests on mock galaxy populations in N-body simulations, as well as on a suite of 4096 mock catalogues which fully reproduce the galaxy clustering, survey masks and selection functions. Based on this, we estimate a false positive detection rate of 3%. Comparison with mock catalogues limits deviations of the void size distribution from that predicted in the ΛCDM model to be less than 6% for voids with effective radius 8<Rv<60 h-1Mpc and in the redshift range 0.15<z<0.7. This could tightly constrain modified gravity scenarios and models with a varying equation of state, but we identify systematic biases which must be accounted for to reduce the theoretical uncertainty in the predictions for these models to the current level of precision attained from the data. We also examine the distribution of void densities and identify a deficit of the deepest voids relative to ΛCDM expectations, which is significant at more than the 3σ equivalent level. We discuss possible explanations for this discrepancy but at present its cause remains unknown.
Original languageEnglish
Pages (from-to)358-370
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume461
Issue number1
Early online date7 Jun 2016
DOIs
Publication statusPublished - Sep 2016

Keywords

  • cosmology : observations
  • Large-scale structure of Universe
  • methods : data analysis
  • methods: numerical

Fingerprint

Dive into the research topics of 'Testing cosmology with a catalogue of voids in the BOSS galaxy surveys'. Together they form a unique fingerprint.
  • Beyond ΛCDM: problems, solutions, and the road ahead

    Bull, P., Akrami, Y., Adamek, J., Baker, T., Bellini, E., Jiménez, J. B., Bentivegna, E., Camera, S., Clesse, S., Davis, J. H., Dio, E. D., Enander, J., Heavens, A., Heisenberg, L., Hu, B., Llinares, C., Maartens, R., Mörtsell, E., Nadathur, S., Noller, J. & 20 others, Pasechnik, R., Pawlowski, M. S., Pereira, T. S., Quartin, M., Ricciardone, A., Riemer-Sørensen, S., Rinaldi, M., Sakstein, J., Saltas, I. D., Salzano, V., Sawicki, I., Solomon, A. R., Spolyar, D., Starkman, G. D., Steer, D., Tereno, I., Verde, L., Villaescusa-Navarro, F., Strauss, M. V. & Winther, H. A., Jun 2016, In: Physics of the Dark Universe. 12, p. 56-99

    Research output: Contribution to journalArticlepeer-review

    Open Access
    File
    101 Downloads (Pure)

Cite this