Articles with "lyman alpha" as a keyword



Solar-induced 27-day variations of polar mesospheric clouds from the AIM SOFIE and CIPS experiments

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Published in 2017 at "Journal of Atmospheric and Solar-Terrestrial Physics"

DOI: 10.1016/j.jastp.2016.09.008

Abstract: Abstract Polar Mesospheric Cloud (PMC) observations from the Solar Occultation for Ice Experiment (SOFIE) and the Cloud Imaging and Particle Size (CIPS) experiment are used to investigate the response of PMCs to forcing associated with… read more here.

Keywords: solar lyman; day variations; pmc; lyman alpha ... See more keywords

Light in the dark forest. Part I. An efficient optimal estimator for 3D Lyman-alpha forest power spectrum

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Published in 2025 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2025/07/085

Abstract: The highly anisotropic nature of the Lyman-alpha (Lyα) forest data introduces a complex survey window function that complicates the measurement of the three-dimensional power spectrum (P 3D). In this paper, we present the first fully… read more here.

Keywords: lyman alpha; power; power spectrum; optimal estimator ... See more keywords

Lyman-alpha spectroscopy of extreme [O iii] emitting galaxies at z ≃ 2-3: implications for Lyα visibility and LyC leakage at z > 6

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Published in 2021 at "Monthly Notices of the Royal Astronomical Society"

DOI: 10.1093/mnras/stab705

Abstract: Spectroscopic observations of massive z > 7 galaxies selected to have extremely large [O III] + H β equivalent width (EW ∼1500 Å) have recently revealed large Ly α detection rates, in contrast to the… read more here.

Keywords: emitting galaxies; lyman alpha; spectroscopy; emission ... See more keywords

Influence of turbulence on Lyman-alpha scattering

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Published in 2022 at "Monthly Notices of the Royal Astronomical Society"

DOI: 10.1093/mnras/stad1165

Abstract: We develop a Monte Carlo radiative transfer code to study the effect of turbulence with a finite correlation length on scattering of Lyman-alpha (Lyα) photons propagating through neutral atomic hydrogen gas. We investigate how the… read more here.

Keywords: lyman alpha; alpha scattering; turbulence lyman; turbulence ... See more keywords

Statistical properties of damped Lyman-alpha systems from Sloan Digital Sky Survey DR12

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Published in 2017 at "Monthly Notices of the Royal Astronomical Society"

DOI: 10.1093/mnras/stw3246

Abstract: We present new estimates for the statistical properties of damped Lyman-$\alpha$ absorbers (DLAs). We compute the column density distribution function at $z>2$, the line density, $\mathrm{d}N/\mathrm{d}X$, and the neutral hydrogen density, $\Omega_\mathrm{DLA}$. Our estimates are… read more here.

Keywords: survey; damped lyman; density; lyman alpha ... See more keywords

Spectral variations of Lyman $\alpha$ emission within strongly lensed sources observed with MUSE

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Published in 2019 at "Monthly Notices of the Royal Astronomical Society"

DOI: 10.1093/mnras/stz2492

Abstract: We present an analysis of ${\rm H\,\rm{\small {I}}}$ Lyman $\alpha$ emission in deep VLT/MUSE observations of two highly magnified and extended galaxies at $z=3.5$ and 4.03, including a newly discovered, almost complete Einstein ring. While these… read more here.

Keywords: spectral variations; alpha emission; line; lyman alpha ... See more keywords

DESI DR2 results. I. Baryon acoustic oscillations from the Lyman alpha forest

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Published in 2025 at "Physical Review D"

DOI: 10.1103/2wwn-xjm5

Abstract: We present the Baryon Acoustic Oscillation (BAO) measurements with the Lyman-alpha (LyA) forest from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI) survey. Our BAO measurements include both the auto-correlation of… read more here.

Keywords: bao measurements; desi; lyman alpha; baryon acoustic ... See more keywords

Comparison of the Intensity of the Nighttime Scattered Atmospheric Radiation in the Lyman-Alpha Line from OGO-4 Satellite Measurements and Calculations

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Published in 2020 at "Geomagnetism and Aeronomy"

DOI: 10.1134/s001679322004012x

Abstract: Abstract A theoretical model has been developed for the calculation of the intensity and flux of nighttime Lyman-alpha solar radiation at altitudes of the atmosphere that takes into account the multiple scatterings of this radiation… read more here.

Keywords: lyman alpha; intensity; radiation; model ... See more keywords

Comparison of Lyman-alpha and LI-COR infrared hygrometers for airborne measurement of turbulent fluctuations of water vapour

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Published in 2018 at "Atmospheric Measurement Techniques"

DOI: 10.5194/amt-11-2523-2018

Abstract: Abstract. To investigate if the LI-COR humidity sensor can be used as a replacement of the Lyman-alpha sensor for airborne applications, the measurement data of the Lyman-alpha and several LI-COR sensors are analysed in direct… read more here.

Keywords: lyman alpha; fluctuations water; path; cor ... See more keywords