The 3D Lyman-<i>α</i> forest power spectrum from eBOSS DR16
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
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Cosmology measurement of the 3D Lyman-alpha forest power spectrum from eBOSS; the object is large-scale structure.
The paper measures a cosmological power spectrum and evaluates its modeling pipeline.
Cosmology measurement of the 3D Lyman-alpha forest power spectrum.
Abstract
ABSTRACT We measure the three-dimensional power spectrum (P3D) of the transmitted flux in the Lyman-$\alpha$ (Ly $\alpha$) forest using the complete extended Baryon Oscillation Spectroscopic Survey data release 16 (eBOSS DR16). This sample consists of $\sim$205 000 quasar spectra in the redshift range $2\le z \le 4$ at an effective redshift $z=2.334$. We propose a pair-count spectral estimator in configuration space, weighting each pair by $\exp (i\mathbf {k}\cdot \mathbf {r})$, for wave vector $\mathbf {k}$ and pixel pair separation $\mathbf {r}$, effectively measuring the anisotropic power spectrum without the need for fast Fourier transforms. This accounts for the window matrix in a tractable way, avoiding artefacts found in Fourier-transform based power spectrum estimators due to the sparse sampling transverse to the line of sight of Ly $\alpha$ skewers. We extensively test our pipeline on two sets of mocks: (i) idealized Gaussian random fields with a sparse sampling of Ly $\alpha$ 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 $(0.02 \le k \le 0.35)\, h\, {\rm Mpc}^{-1}\,$ at the 1–2σ level with a covariance matrix derived from LyaCoLoRe mocks. We demonstrate a promising new approach for full-shape cosmological analyses of Ly $\alpha$ 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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The record
- Venue
- Monthly Notices of the Royal Astronomical Society
- Topic
- Galaxies: Formation, Evolution, Phenomena
- Field
- Physics and Astronomy
- Canadian institutions
- —
- Funders
- Office of ScienceMax-Planck-Institut für AstronomieUniversity of Colorado BoulderMinistério da Ciência, Tecnologia e InovaçãoUniversity of OxfordYork UniversityNational Energy Research Scientific Computing CenterLeibniz-GemeinschaftUniversity of Notre DameSimons Society of FellowsCarnegie Mellon UniversityAlfred P. Sloan FoundationUniversity of WashingtonJohns Hopkins UniversityCarnegie Institution of WashingtonUniversity of UtahOhio State UniversityU.S. Department of EnergyKavli FoundationSmithsonian InstitutionNew Mexico State UniversityUniversity of PortsmouthVanderbilt UniversityYale University
- Keywords
- PhysicsSpectral densityRedshiftAstrophysicsSpectral lineGalaxyStatisticsQuantum mechanics
- Has abstract in OpenAlex
- yes