Sentences with phrase «strong hydrogen lines»
They have strong hydrogen lines, at a maximum by A0, and also lines of ionized metals (Fe II, Mg II, Si II) at a maximum at A5.
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But the spectra from SN 2009ip show strong lines of hydrogen.
Indeed, its Lyman - alpha spectrum, i.e. one of the spectral lines of hydrogen it emits, is much narrower and stronger than that of most galaxies, therefore confirming her theoretical predictions.
The 1992 supernova is known to have been one of these because strong lines of hydrogen appeared in its spectrum.
Type Ib and Ic supernovae result from the collapse of a massive star's core whose outer hydrogen layers have been transfered to a companion star or blown off from strong winds which is why they do not show hydrogen emission lines.
Type I supernovae happen in close binary systems and do not show strong hydrogen emission lines.
Type II supernovae happen in single star systems (or at least far enough away from any companion star to retain their hydrogen outer layers) and have strong hydrogen emission lines.
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.
SDSS Collaboration Larger illustration Spectra of J1030 and another remote quasar displayed unexpectedly strong lines of heavier elements, i.e., carbon, oxygen, nitrogen, and silicon (more on the «Gunn - Peterson trough» and the ionization of neutral hydrogen).
Based on the extreme, deduced photometric redshift of GRB 000131 indicating that the gamma rays had travelled an extreme long cosmological distance, astronomers predicted a «break» in the red region of the spectrum around 670 to 700 nm from the strong absorption of light from intervening intergalactic hydrogen clouds along the line of sight between GRB 000131 and the Solar System.