Detecting Damped Lyman-α Absorbers with Gaussian Processes

Roman Garnett, Shirley Ho, Simeon Bird, Jeff Schneider
5/14/2016
astro-ph.COphysics.data-an

Official code: rmgarnett/gp_dla_detection (3 stars, MIT, last commit 2020-08-12).

Abstract

We develop an automated technique for detecting damped Lyman-$α$ absorbers (DLAs) along spectroscopic lines of sight to quasi-stellar objects (QSOs or quasars). The detection of DLAs in large-scale spectroscopic surveys such as SDSS-III sheds light on galaxy formation at high redshift, showing the nucleation of galaxies from diffuse gas. We use nearly 50 000 QSO spectra to learn a novel tailored Gaussian process model for quasar emission spectra, which we apply to the DLA detection problem via Bayesian model selection. We propose models for identifying an arbitrary number of DLAs along a given line of sight. We demonstrate our method's effectiveness using a large-scale validation experiment, with excellent performance. We also provide a catalog of our results applied to 162 858 spectra from SDSS-III data release 12.

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rmgarnett/gp_dla_detectionOfficial100%
MIT

Detecting Damped Lyman-alpha Absorbers (DLAs) with Gaussian Processes

35C, ShellOct 2, 20166 years agoMIT

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Cite this paper

@article{garnett2016detecting,
  title  = {Detecting Damped Lyman-α Absorbers with Gaussian Processes},
  author = {Roman Garnett and Shirley Ho and Simeon Bird and Jeff Schneider},
  year   = {2016},
  eprint = {1605.04460},
  archivePrefix = {arXiv},
  url    = {https://arxiv.org/abs/1605.04460}
}

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