Definitions

from The Century Dictionary and Cyclopedia

  • n. One of the bright lines in the spectrum of an element: opposed to absorption-line.

Etymologies

Sorry, no etymologies found.

Examples

  • Abundances in the interstellar medium (ISM) are typically determined using emission-line spectroscopy of HII regions.

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  • The Galaxy Zoo morphological survey of SDSS objects has uncovered a peculiar emission-line structure whose spectrum matches the narrow-line region of AGN, despite lying at least 20 kpc from a galaxy whose activity is currently very weak.

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  • The survey was designed to collect basic observational data for a large number of extragalactic emission-line sources.

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  • Physical conditions in the nuclei of emission-line galaxies are investigated by ...

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  • I will use the standard technique of emission-line and continuum imaging, which easily discloses PNe.

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  • This will produce: an emission-line redshift survey unbiased by magnitude and color selection; star formation rates as a function of galaxy properties, e.g. stellar mass and morphology/mergers measured by ACS; comparisons of SFRs from H-alpha to UV and far-IR indicators; calibrations of line ratios of H-alpha to important nebular lines such as [O II] and H-beta, measuring variations in metallicity and extinction and their effect on SFR estimates; and the first measurement of scale lengths of the H-alpha emitting, star - forming region in a large sample of z~1 sources.

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