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Animation of a Lyman-alpha blob. The giant Lyman-alpha blob LAB-1 (left) and an artist's impression of what it might look like if viewed from relatively close (right). In astronomy, a Lyman-alpha blob (LAB) is a huge concentration of a gas emitting the Lyman-alpha emission line. LABs are some of the largest known individual objects in the Universe.
Lyman-alpha blob 1 (LAB-1) is a giant cosmic cloud of gas located in the constellation of Aquarius, approximately 11.5 billion light-years from Earth with a redshift (z) of 3.09. It was discovered unexpectedly in 2000 by Charles Steidel and colleagues, [ 2 ] who were surveying for high- redshift galaxies using the 200 inch (5.08 m) Hale ...
Lyman-alpha, typically denoted by Ly-α, is a spectral line of hydrogen (or, more generally, of any one-electron atom) in the Lyman series. It is emitted when the atomic electron transitions from an n = 2 orbital to the ground state ( n = 1), where n is the principal quantum number .
Himiko is a large gas cloud found at redshift of z=6.6 that predates similar Lyman-alpha blobs.At the time of its discovery in 2009, researchers said it "may represent the most massive object ever discovered in the early universe". [1]
TON 618 (abbreviation of Tonantzintla 618) is a hyperluminous, broad-absorption-line, radio-loud quasar, and Lyman-alpha blob [2] located near the border of the constellations Canes Venatici and Coma Berenices, with the projected comoving distance of approximately 18.2 billion light-years from Earth.
Himiko (Lyman-alpha blob) L. Lyman-alpha blob 1; T. TON 618; U. UM 287 This page was last edited on 23 December 2017, at 12:30 (UTC). Text is available under the ...
Some of these Lyman-alpha blobs have line luminosities up to ~ 10 44 erg s −1 with their spatial extents exceeding 100 proper kpc. [4] [5] But in this case, the Lyman-alpha blob structure in UM 287 is 1.5 million light-years across making it too big to be contained within the quasar's host galaxy, [6] which is found to be a massive early-type ...
The Lyman-alpha forest was first discovered in 1970 by astronomer Roger Lynds in an observation of the quasar 4C 05.34. [1] Quasar 4C 05.34 was the farthest object observed to that date, and Lynds noted an unusually large number of absorption lines in its spectrum and suggested that most of the absorption lines were all due to the same Lyman-alpha transition. [2]