Greig, Bradley and Bosman, S. E. and Davies, F. B. and Durovcikova, D. and Fathivavsari, H. and Liu, B. and Sun, Z. and Meyer, R. A. and D'Odorico, V and Gallerani, S. and Mesinger, A. and Ting, Y-S (2024) Blind QSO reconstruction challenge: exploring methods to reconstruct the Ly α emission line of QSOs. Monthly Notices of the Royal Astronomical Society, 533 (3). pp. 3312-3343. ISSN 0035-8711, DOI https://doi.org/10.1093/mnras/stae1985.
Full text not available from this repository.Abstract
Reconstructing the intrinsic Ly alpha line flux from high-z QSOs can place constraints on the neutral hydrogen content of the intergalactic medium during reionization. There are now greater than or similar to 10 different Ly alpha reconstruction pipelines using different methodologies to predict the Ly alpha line flux from correlations with the spectral information redwards of Ly alpha. However, there have been few attempts to directly compare the performance of these pipelines. Therefore, we devised a blind QSO challenge to compare these reconstruction pipelines on a uniform set of objects. Each author was provided de-identified, observed rest-frame QSO spectra with spectral information only redwards of 1260 & Aring; rest-frame to ensure unbiased reconstruction. We constructed two samples of 30 QSOs, from X-Shooter and Sloan Digital Sky Survey (SDSS) both spanning 3.5<z<4.5. Importantly, the purpose of this comparison study was not to champion a single, best-performing reconstruction pipeline but rather to explore the relative performance of these pipelines over a range of QSOs with broad observational characteristics to infer general trends. In summary, we find machine-learning approaches in general provide the strongest `best guesses' but underestimate the accompanying statistical uncertainty, although these can be recalibrated, while pipelines that decompose the spectral information, for example principal component or factor analysis, generally perform better at predicting the Ly alpha profile. Further, we found that reconstruction pipelines trained on SDSS QSOs performed similarly on average for both the X-Shooter and SDSS samples indicating no discernible biases owing to differences in the observational characteristics of the training set or QSO being reconstructed, although the recovered distributions of reconstructions for X-Shooter were broader likely due to an increased fraction of outliers.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | quasars: emission lines; quasars: general; cosmology: observations; cosmology: theory |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 13 Feb 2025 06:38 |
| Last Modified: | 13 Feb 2025 06:38 |
| URI: | http://eprints.um.edu.my/id/eprint/47471 |
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