A Ly-alpha nebula at z~3.3
Pascale Hibon, Francis Tang, and Romain Thomas

TL;DR
This paper introduces ATACAMA, a new systematic tool for discovering large Ly-alpha nebulae across various redshifts, demonstrated by identifying a candidate at z~3.3, advancing the study of early galaxy formation.
Contribution
The paper presents a novel systematic searching tool, ATACAMA, capable of finding large Ly-alpha nebulae at any redshift using broad-band imaging, expanding the redshift range of such discoveries.
Findings
Identified a Ly-alpha nebula candidate at z~3.3 with a 29.4 sq.arcsec area.
Morphology consistent with known Ly-alpha blobs, including bright and faint cores.
Estimated Ly-alpha equivalent width and line flux match previous studies.
Abstract
Context. Searching for high-redshift galaxies is a field of intense activity in modern observational cosmology that will continue to grow with future ground-based and sky observatories. Over the last few years, a lot has been learned about the high-z Universe. Aims. Despite extensive Ly-alpha Blobs (LAB) surveys from low to high redshifts, giant LABs over 100 kpc have been found mostly at z~2-4. This redshift range is coincident with the transition epoch of galactic gas-circulation processes from inflows to outflows at z~2.5-3. This suggests that the formation of giant LABs may be related to a combination of gas inflows and outflows. Their extreme youth makes them interesting objects in the study of galaxy formation as they provide insight into some of the youngest known highly star forming galaxies, with only modest time investments using ground-based telescopes. Methods. Systematic…
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