Building a better understanding of the massive high-redshift BOSS CMASS galaxies as tools for cosmology

Ginevra Favole, Cameron K. McBride, Daniel J. Eisenstein, Francisco Prada, Molly E. Swanson, Chia Hsun Chuang, Donald P. Schneider

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We explore the massive bluer star-forming population of the Sloan Digital Sky Survey (SDSS) III/BOSS CMASS DR11 galaxies at z > 0.55 to quantify their differences, in terms of redshiftspace distortions and large-scale bias, with respect to the luminous red galaxy sample. We perform a qualitative analysis to understand the significance of these differences and whether we can model and reproduce them in mock catalogues. Specifically, we measure galaxy clustering in CMASS on small and intermediate scales (0.1 ≲ r ≲ 50 h-1 Mpc) by computing the two-point correlation function - both projected and redshift-space - of these galaxies, and a new statistic, Σ(π), able to separate the coherent and dispersed redshift-space distortion contributions and the large-scale bias. We interpret our clustering measurements by adopting a Halo Occupation Distribution (HOD) scheme that maps them on to high-resolution N-body cosmological simulations to produce suitable mock galaxy catalogues. The traditional HOD prescription can be applied to the red and the blue samples, independently, but this approach is unphysical since it allows the same mock galaxies to be either red or blue. To overcome this ambiguity, we modify the standard formulation and infer the red and the blue models by splitting the full mock catalogue into two complementary and non-overlapping submocks. This separation is performed by constraining the HOD with the observed CMASS red and blue galaxy fractions and produces reliable and accurate models.

Original languageEnglish (US)
Pages (from-to)2218-2236
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume462
Issue number2
DOIs
StatePublished - Jan 1 2016

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cosmology
occupation
galaxies
catalogs
qualitative analysis
halos
blue stars
simulation
distribution
massive stars
ambiguity
statistics
formulations
high resolution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Favole, Ginevra ; McBride, Cameron K. ; Eisenstein, Daniel J. ; Prada, Francisco ; Swanson, Molly E. ; Chuang, Chia Hsun ; Schneider, Donald P. / Building a better understanding of the massive high-redshift BOSS CMASS galaxies as tools for cosmology. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 462, No. 2. pp. 2218-2236.
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Building a better understanding of the massive high-redshift BOSS CMASS galaxies as tools for cosmology. / Favole, Ginevra; McBride, Cameron K.; Eisenstein, Daniel J.; Prada, Francisco; Swanson, Molly E.; Chuang, Chia Hsun; Schneider, Donald P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 462, No. 2, 01.01.2016, p. 2218-2236.

Research output: Contribution to journalArticle

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AU - Favole, Ginevra

AU - McBride, Cameron K.

AU - Eisenstein, Daniel J.

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AU - Chuang, Chia Hsun

AU - Schneider, Donald P.

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