|Known for||led the team that announced the most ancient and most distant star|
Brian Welch is a PhD student, studying Astronomy, at John Hopkins University. His thesis supervisor, Dan Coe, discovered a very distant galaxy, called The Sunrise Arc, in 2016. That Galaxy was only found because the gravity of a supercluster of galaxies that lie between us and The Sunrise Arc magnified its light, through Gravitational lensing.
Coe assigned Welch the task of examining promising objects within The Sunrise Arc.
Meanwhile Welch had found, in 2018, an object now known as Earendel. Welch co-ordinated an international team of Astronomers, who confirmed that Earendel seemed to be a very distant early star. Welch was the lead author of a paper in the prestigious Science journal Nature, announcing the discovery, on March 30, 2022.
- Joel Achenbach. Hubble telescope detects most distant star ever seen, near cosmic dawn, Washington Post, 2022-03-30. Retrieved on 2022-03-30. “Earendel is part of an early, small galaxy whose light has been magnified and distorted in two curved strips as a result of such lensing. Astronomer Dan Coe of Johns Hopkins discovered and named the Sunrise Arc in 2016 as part of a Hubble observation program. Welch, Coe’s student, scrutinized a tiny speck — some kind of object — providentially located on the arc where the magnification was highest. Over the course of 3½ years, the object remained in that spot.”
- B. Welch. Relics: Parsec-Scale Star Clusters In The First Billion Years, Bulletin of the American Astronomical Society. Retrieved on 2022-03-30. “I will present RELICS observations of the highly magnified Sunrise Arc, a 15" long lensed arc observed at z = 6.2.” mirror
- Brian Welch, et al. (2022-03-30). "A highly magnified star at redshift 6.2". Nature 603: 815-818. DOI:10.1038/s41586-022-04449-y. Retrieved on 2022-03-30. Research Blogging.