The 3D Lyman-α Forest Power Spectrum from eBOSS DR16
arxiv(2024)
摘要
We measure the three-dimensional power spectrum (P3D) of the transmitted flux
in the Lyman-α (Ly-α) forest using the complete extended Baryon
Oscillation Spectroscopic Survey data release 16 (eBOSS DR16). This sample
consists of 205,012 quasar spectra in the redshift range 2 <= z <= 4 at an
effective redshift z=2.334. We propose a pair-count spectral estimator in
configuration space, weighting each pair by exp(ikr), for wave vector k and
pixel pair separation r, effectively measuring the anisotropic power spectrum
without the need for fast Fourier transforms. This accounts for the window
matrix in a tractable way, avoiding artifacts found in Fourier-transform based
power spectrum estimators due to the sparse sampling transverse to the
line-of-sight of Ly-α skewers. We extensively test our pipeline on two
sets of mocks: (i) idealized Gaussian random fields with a sparse sampling of
Ly-α skewers, and (ii) log-normal LyaCoLoRe mocks including realistic
noise levels, the eBOSS survey geometry and contaminants. On eBOSS DR16 data,
the Kaiser formula with a non-linear correction term obtained from hydrodynamic
simulations yields a good fit to the power spectrum data in the range 0.02 <= k
<= 0.35 h/Mpc at the 1-2 sigma level with a covariance matrix derived from
LyaCoLoRe mocks. We demonstrate a promising new approach for full-shape
cosmological analyses of Ly-α forest data from cosmological surveys such
as eBOSS, the currently observing Dark Energy Spectroscopic Instrument and
future surveys such as the Prime Focus Spectrograph, WEAVE-QSO and 4MOST.
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