Recovering the tidal field in the projected galaxy distribution

David Alonso, Boryana Hadzhiyska, Michael A. Strauss

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We present a method to recover and study the projected gravitational tidal forces from a galaxy survey containing little or no redshift information. The method and the physical interpretation of the recovered tidal maps as a tracer of the cosmic web are described in detail. We first apply the method to a simulated galaxy survey and study the accuracy with which the cosmic web can be recovered in the presence of different observational effects, showing that the projected tidal field can be estimated with reasonable precision over large regions of the sky. We then apply our method to the Two Micron All-Sky survey and present a publicly available full-sky map of the projected tidal forces in the local Universe. As an example of an application of these data, we further study the distribution of galaxy luminosities across the different elements of the cosmic web, finding that, while more luminous objects are found preferentially in the most dense environments, there is no further segregation by tidal environment.

Original languageEnglish (US)
Pages (from-to)256-272
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Jul 21 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Cosmology: observations
  • Large-scale structure of Universe


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