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The Effect of Slitless Spectroscopic Redshift Uncertainty and Interlopers on BAO Measurements from CSST-like Samples — arXiv:2608.24276

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.24276
License (as archived): CC0-1.0
Archived: 2026-10-18T07:22:12.239Z
SHA-256 of the archived text: f6e1bc6a56a19df12e394839ffaf89a443e696cfd02e95de7d9a330f7aa2d17b
Stable URL of this page: https://metraipolis.com/documento/dc_ff3661297f01

How to cite

The Effect of Slitless Spectroscopic Redshift Uncertainty and Interlopers on BAO Measurements from CSST-like Samples — arXiv:2608.24276 — arXiv (en), https://arxiv.org/abs/2608.24276 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_ff3661297f01 (Metraipolis archive dc_ff3661297f01, sha256 f6e1bc6a56a19df12e394839ffaf89a443e696cfd02e95de7d9a330f7aa2d17b)

BibTeX

@misc{dcff3661297f01,
  title = {The Effect of Slitless Spectroscopic Redshift Uncertainty and Interlopers on BAO Measurements from CSST-like Samples — arXiv:2608.24276},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.24276},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_ff3661297f01; sha256 f6e1bc6a56a19df12e394839ffaf89a443e696cfd02e95de7d9a330f7aa2d17b},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.24276. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The baryon acoustic oscillations (BAO) is a vital probe to measure cosmological distances and constrain dark energy. The ongoing and near-future space-based telescopes, including the Chinese Space Station Survey Telescope (CSST), will perform galaxy redshift surveys using slitless spectroscopy. Due to the relatively low spectral resolution and observational effects, there will be uncertainties and interloper contamination in measured redshifts. In this study, we consider the Gaussian-distributed redshift uncertainty and [O III]-H$\beta$ interlopers in the CSST-like slitless spectroscopic redshift (spec-z) samples, which are simulated using the approximate $N$-body code FastPM. We study the effect of spec-z errors on BAO before and after density field reconstruction. Both the redshift uncertainty and interlopers can damp the BAO signal, and the latter can further induce oscillations in the broadband shape of the power spectrum. We model the interloper effect on the propagator, i.e. the cross-correlation between the observed and initial density fields, as well as on the BAO power spectrum. We study the influence of the spec-z errors on the fitted anisotropic BAO parameters $\alpha_{\perp}$ and $\alpha_{\parallel}$. The resulting systematic bias on $\alpha_{\perp}$ and $\alpha_{\parallel}$ is mild, mostly within $0.1$ per cent and $0.2$ per cent, respectively. Even with the spec-z errors, BAO reconstruction can still significantly reduce the systematic bias and statistical errors on the $\alpha$ parameters. Furthermore, we vary the redshift uncertainty and study the reconstruction performance.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-26 in astro-ph.CO).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO).
Pagina del lavoro: https://arxiv.org/abs/2608.24276 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-18T07:18:24.752Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-08-26?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).