تقرير
A Cautionary Tale of LyC Escape Fraction Estimates from High Redshift Galaxies
| العنوان: | A Cautionary Tale of LyC Escape Fraction Estimates from High Redshift Galaxies |
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| المؤلفون: | Bassett, R., Ryan-Weber, E. V., Cooke, J., Mestric, U., Prichard, L. J., Rafelski, M., Iwata, I., Sawicki, M., Gwyn, S., Arnouts, S. |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | Measuring the escape fraction, $f_{\rm esc}$, of ionizing, Lyman Continuum (LyC) radiation is key to our understanding of the process of cosmic reionization. In this paper we provide a methodology for recovering the posterior probability distribution of the LyC escape fraction, $f_{\rm esc}^{\rm PDF}$, considering both the observational uncertainties and ensembles of simulated transmission functions through the intergalactic medium (IGM). We present an example of this method applied to a VUDS galaxy at $z=3.64$ and find $f_{\rm esc}^{\rm PDF}$ = 0.51$^{+0.33}_{-0.34}$ and compare this to the values computed assuming averaged IGM transmission with and without consideration of detection bias along average sightlines yielding $f_{\rm esc}^{\langle T \rangle}$ = 1.40$^{+0.80}_{-0.42}$, and $f_{\rm esc}^{\rm bias}$ = 0.82$^{+0.33}_{-0.16}$. Our results highlight the limitations of methods assuming average, smooth transmission functions. We also present MOSFIRE data for a sample of seven LyC candidates selected based on photometric redshifts at $z > 3.4$, but find that all seven have overestimated photometric redshifts by $\Delta z \sim 0.2$ making them unsuitable for LyC measurements. This results likely due to a bias induced by our selection criteria. Comment: 12 pages, 9 figues, 2 tables, accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac270 |
| URL الوصول: | http://arxiv.org/abs/2202.02859 |
| رقم الأكسشن: | edsarx.2202.02859 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac270 |
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