Asset Details
Do you wish to reserve the book?
The Impact of Galaxy Overdensities and Ionized Bubbles on Lyα Emission at z ∼ 7.0–8.5
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
The Impact of Galaxy Overdensities and Ionized Bubbles on Lyα Emission at z ∼ 7.0–8.5
Do you wish to request the book?
The Impact of Galaxy Overdensities and Ionized Bubbles on Lyα Emission at z ∼ 7.0–8.5
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
The Impact of Galaxy Overdensities and Ionized Bubbles on Lyα Emission at z ∼ 7.0–8.5
2026
Overview
Lyα spectroscopy with JWST is opening a new window on the sizes of ionized bubbles through the reionization epoch. Theoretical expectations suggest typical bubble radii should be 0.6–1.5 pMpc at z ≃ 7, assuming neutral hydrogen fractions of the intergalactic medium in the range x¯HI = 0.5–0.7. Here, we investigate this picture using JWST to characterize the environment and Lyα emission of 292 galaxies at 7.0 < z < 8.5 across five fields spanning a comoving volume of 1.3 × 106 Mpc3. If the reionization predictions are correct, we should see overdensities and strong Lyα emission clustered in redshift windows of dz = 0.04–0.08 and angular scales of 5′–11′. We detect Lyα emission in 36 out of 292 galaxies, including nine new Lyα detections, two of which (in the UltraDeep Survey field) show extremely large equivalent widths (EW = 200−78+50 Å and 284−75+56 Å). We identify 13 significant (4–11×) galaxy overdensities using redshifts from NIRCam grism and NIRSpec. Strong Lyα emitters are almost uniformly found in the overdensities, with nearly all located between the center and back of the structures. The overdensities that host the strong Lyα emitters span typical line-of-sight distances (dz ∼ 0.14) and angular scales (∼8′) that are comparable to the predicted bubble sizes at z ≃ 7. We discuss evidence that the Extended Groth Strip is mostly ionized along a 24 pMpc sight line at z ≃ 7.0–7.6, based on the presence of three overdense structures and 10 Lyα emitters in this volume, and find such a large ionized region would pose tension with standard reionization models.
Publisher
IOP Publishing
Subject
