التفاصيل البيبلوغرافية
| العنوان: |
A Comprehensive Study of Lyα Emission in the High-redshift Galaxy Population. |
| المؤلفون: |
Grecco A. Oyarzún, Guillermo A. Blanc, Valentino González, Mario Mateo, John I. Bailey III |
| المصدر: |
Astrophysical Journal; 7/10/2017, Vol. 843 Issue 2, p1-1, 1p |
| مصطلحات موضوعية: |
GALAXIES, GALACTIC evolution, GALAXY formation, STATISTICS, PHOTOMETRY, SPECTRAL energy distribution |
| مستخلص: |
We present an exhaustive census of Lyman alpha (Lyα) emission in the general galaxy population at . We use the Michigan/Magellan Fiber System (M2FS) spectrograph to study a stellar mass (M ) selected sample of 625 galaxies homogeneously distributed in the range . Our sample is selected from the 3D-HST/CANDELS survey, which provides the complementary data to estimate Lyα equivalent widths () and escape fractions (fesc) for our galaxies. We find both quantities to anti-correlate with M*, star formation rate (SFR), UV luminosity, and UV slope (β). We then model the distribution as a function of MUV and β using a Bayesian approach. Based on our model and matching the properties of typical Lyman break galaxy (LBG) selections, we conclude that the distribution in such samples is heavily dependent on the limiting MUV of the survey. Regarding narrowband surveys, we find their selections to bias samples toward low M*, while their line-flux limitations preferentially leave out low-SFR galaxies. We can also use our model to predict the fraction of Lyα-emitting LBGs at 4 ≤ z ≤ 7. We show that reported drops in the Lyα fraction at z ≥ 6, usually attributed to the rapidly increasing neutral gas fraction of the universe, can also be explained by survey MUV incompleteness. This result does not dismiss reionization occurring at z ∼ 7, but highlights that current data is not inconsistent with this process taking place at z > 7. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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