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Euclid preparation. LXXXIII. The impact of redshift interlopers on the two-point correlation function analysis

Euclid Collaboration I. Risso A. Veropalumbo E. Branchini E. Maragliano S. D. Torre +495 lainnya
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The Euclid galaxy survey is designed to measure the spectroscopic redshift of emission-line galaxies (ELGs) by identifying the emission line in their slitless spectra. The efficacy of this approach crucially depends on the signal-to-noise ratio (S/N) of the line, as sometimes noise fluctuations in the spectrum continuum can be misidentified as In addition, other genuine strong emission lines can be mistaken for depending on the redshift of the source. Both effects lead to ambiguities in the redshift measurement that can result in catastrophic redshift errors and the inclusion of `interloper' galaxies in the sample. This paper forecasts the impact on the galaxy clustering analysis of the expected redshift errors in the Euclid spectroscopic sample. Specifically, it investigates the effect of the redshift interloper contamination on the galaxy two-point correlation function (2PCF) and, in turn, on the inferred growth rate of structure (f σ_8) and Alcock--Paczynski (AP) parameters (α_∥) and (α_⊥). This work is based on the analysis of synthetic spectroscopic catalogues, the EuclidLargeMocks, which mimic the area and selection function of the Euclid Data Release 1 (DR1) sample. We estimated the 2PCF of contaminated catalogues and separated the different contributions, particularly those coming from galaxies with correctly measured redshift and from contaminants. We explored different models of increasing complexity to describe the measured 2PCF at a fixed cosmology, with the aim of identifying the most efficient model to reproduce the data. Finally, we performed a cosmological inference and evaluated the systematic error on the inferred (f σ_8), (α_∥) , and (α_⊥) values associated with different models. 1000 Our results demonstrate that a minimal modelling approach, which only accounts for an attenuation of the clustering signal regardless of the type of contaminants, is sufficient to recover the correct values of (f σ_8) , (α_∥), and (α_⊥) at DR1. The accuracy and precision of the estimated AP parameters are largely insensitive to the presence of interlopers. The adoption of a minimal modelling induces a 1%--3% systematic error on the growth rate of structure estimation, depending on the considered redshift. However, this error remains smaller than the statistical error expected for the Euclid DR1 analysis.

Topik & Kata Kunci

Physics

Penulis (500)

E

Euclid Collaboration I. Risso

A

A. Veropalumbo

E

E. Branchini

E

E. Maragliano

S

S. D. Torre

E

E. Sarpa

P

P. Monaco

B

B. Granett

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G. E. Addison

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Format Sitasi

APA MLA BibTeX
Risso, E.C.I., Veropalumbo, A., Branchini, E., Maragliano, E., Torre, S.D., Sarpa, E. et al. (2025). Euclid preparation. LXXXIII. The impact of redshift interlopers on the two-point correlation function analysis. https://doi.org/10.1051/0004-6361/202555402

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Informasi Jurnal
Tahun Terbit
2025
Bahasa
en
Total Sitasi
6×
Sumber Database
Semantic Scholar
DOI
10.1051/0004-6361/202555402
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Open Access ✓