Modelling the observed luminosity function and clustering evolution of Ly α emitters: growing evidence for late reionization
| dc.creator | Weinberger, Lewis H | |
| dc.creator | Haehnelt, Martin G | |
| dc.creator | Kulkarni, Girish | |
| dc.date | 2019-02-22T18:01:37Z | |
| dc.date | 2019-02-22T18:01:37Z | |
| dc.date | 2019-05-01 | |
| dc.date.accessioned | 2026-08-03T03:49:44Z | |
| dc.description | We model the high-redshift (z > 5) Ly α-emitting galaxy (LAE) population using the empirical rest-frame equivalent width distribution. We calibrate to the observed luminosity function and angular correlation function at z = 5.7 as measured by the SILVERRUSH survey. This allows us to populate the high-dynamic-range Sherwood simulation suite with LAEs, and to calculate the transmission of their Ly α emission through the intergalactic medium (IGM). We use this simulated population to explore the effect of the IGM on high-redshift observations of LAEs, and make predictions for the narrow-band filter redshifts at z = 6.6, 7.0, and 7.3. Comparing our model with existing observations, we find a late reionization is suggested, consistent with the recent low optical depth derived from the cosmic microwave background by the Planck collaboration and the opacity fluctuations in the Ly α forest. We also explore the role of the circumgalactic medium (CGM) and the large volume of gas that is infalling on to the host halo versus the IGM in attenuating the Ly α signal, finding that a significant fraction of the attenuation is due to the CGM and infalling gas, which increases towards the end of reionization, albeit with a large scatter across the mock LAE population. | |
| dc.format | application/pdf | |
| dc.identifier | 0035-8711 | |
| dc.identifier | https://www.repository.cam.ac.uk/handle/1810/289873 | |
| dc.identifier | 10.17863/CAM.37112 | |
| dc.identifier | 1365-2966 | |
| dc.identifier.uri | https://repo.dare.co.zw/handle/123456789/181315 | |
| dc.language | eng | |
| dc.publisher | Oxford University Press (OUP) | |
| dc.publisher | https://doi.org/10.1093/mnras/stz481 | |
| dc.rights | All rights reserved | |
| dc.rights | http://purl.org/NET/rdflicense/allrightsreserved | |
| dc.subject | 5101 Astronomical Sciences | |
| dc.subject | 51 Physical Sciences | |
| dc.title | Modelling the observed luminosity function and clustering evolution of Ly α emitters: growing evidence for late reionization | |
| dc.type | Article |