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Record W2021112472

A Physical Model of Lya Emitters

2009· article· en· W2021112472 on OpenAlex

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.

Bibliographic record

VenueFigshare · 2009
Typearticle
Languageen
FieldPhysics and Astronomy
TopicGalaxies: Formation, Evolution, Phenomena
Canadian institutionsSaint Mary's University
Fundersnot available
KeywordsAstrophysicsPhysicsRedshiftHaloLuminosityStellar massFlux (metallurgy)Star formationDark matterAccretion (finance)GalaxyChemistry
DOInot available

Abstract

fetched live from OpenAlex

We present a simple physical model for populating dark matter halos with Lya emitters (LAEs) and predict the properties of LAEs at z 3-7. The central tenet of this model is that the Lya luminosity is proportional to the star formation rate (SFR) which is directly related to the halo mass accretion rate. The only free parameter in our model is then the star formation efficiency (SFE). An efficiency of 2.5% provides the best fit to the Lya luminosity function (LF) at redshift z = 3.1, and we use this SFE to construct Lya LFs at other redshifts. Our model reproduces the Lya LFs, stellar ages, SFR 1-10 M sun yr1, stellar masses ~107to108 M sun, and the clustering properties of LAEs at z 3-7. We find the spatial correlation lengths ro 3-6 h 1 Mpc, in agreement with the observations. Finally, we estimate the field-to-field variation 30% for current volume and flux limited surveys, again consistent with observations. Our results suggest that the star formation, and hence Lya emission in LAEs can be powered by accretion of new material. Relating the accreted mass, rather than the total mass, to the Lya luminosity of LAEs naturally gives rise to their duty cycle.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesInsufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.742
Threshold uncertainty score0.989

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0120.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.018
GPT teacher head0.228
Teacher spread0.210 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it