Sentences with phrase «alpha emission line»
«We frequently see the Lyman - alpha emission line of hydrogen in nearby stars,» says Adi Zitrin, the discovery paper's lead author.
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Using Keck Observatory's powerful infrared spectrograph called MOSFIRE, the team dated the galaxy by detecting its Lyman - alpha emission line — a signature of hot hydrogen gas heated by strong ultraviolet emission from newly born stars.
Spectroscopic observations taken with the GTC - 10.4 m telescope reveal a broad (FWHM ~ 1100 km / s), double - peaked H alpha emission line from which we constrain the radial velocity semi-amplitude of the donor to be K2 > 250 km / s.
They noticed an object producing the hydrogen Lyman alpha emission line in its spectrum.
He and his colleagues focused on the K - alpha emission line of iron, visible in the spectra of many active galactic nuclei (AGN)-- the brilliant centers of these galaxies.
They observed the galaxy using a special band - pass filter that selectively transmits the light around an emission line produced by ionized hydrogen (called the H - alpha emission line).
More accurate distances between the most common type of «planetary nebulae» and the Earth can be estimated simply with three sets of data: firstly, the size of the object on the sky taken from the latest high resolution surveys; secondly, an accurate measurement of how bright the object is in the red hydrogen - alpha emission line; and thirdly, an estimate of the dimming toward the nebula caused by so called interstellar - reddening.
Not exact matches
When hydrogen gas is heated by the ultraviolet emissions of new stars, it produces a spectral signature called the Lyman - alpha line.
With its highly sensitive IR capabilities, TMT will extend our studies of this important line emission, revealing the scale of clustering of early Lyman alpha galaxies and thereby helping to track the evolution of ionization through cosmic time.
The H - alpha line emission, which indicates regions of active star formation, is highlighted in blue (SINGG Survey; Meurer +2006).
The presence of the Lyman - alpha line was unexpected: while it is frequently detected in galaxies closer to Earth, the team thought that EGSY8p7's emission line would have been absorbed when the universe was formed by the hydrogen atoms believed to inhabit the space between galaxies.