emission line objects

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• emission line — noun : a bright line in the emission spectrum of a gas or vapor compare absorption line in the Dict * * * emission line, a line of radiation in spectrum analysis of stellar objects indicating the presence of a specific chemical element …   Useful english dictionary

• Low-ionization nuclear emission-line region — cite journal author= L. C. Ho, A. V. Filippenko, W. L. W. Sargent title=A Search for Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies journal=Astrophysical Journal Supplement year=1997 volume=112… …   Wikipedia

• MCELS (Magellanic Cloud Emission-line Survey) — The Magellanic Cloud Emission Line Survey (MCELS) is a joint project of Cerro Tololo Inter American Observatory (Chile) and the University of Michigan using the CTIO Curtis/Schmidt Telescope. The main goal of the project is to trace the ionized… …   Wikipedia

• Emission theory (vision) — Emission theory or extramission theory is the proposal that visual perception is accomplished by rays of light emitted by the eyes. This theory has been replaced by intromission theory, which is that visual perception is accomplished by rays of… …   Wikipedia

• Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… …   Wikipedia

• World line — In physics, the world line of an object is the unique path of that object as it travels through 4 dimensional spacetime.The concept of world line is distinguished from the concept of orbit or trajectory (such as an orbit in space or a trajectory… …   Wikipedia

• Non-line-of-sight propagation — Non line of sight (NLOS) or near line of sight is a term used to describe radio transmission across a path that is partially obstructed, usually by a physical object in the innermost Fresnel zone. Many types of radio transmissions depend, to… …   Wikipedia

• Liste der astronomischen Kataloge — Dies ist eine Liste astronomischer Kataloge. Ein astronomischer Katalog ist eine Verzeichnis astronomischer Objekte mit gemeinsamen Eigenschaften, etwa Form, Zusammensetzung oder ihre Entdeckungsmethode. Astronomische Kataloge sind üblicherweise… …   Deutsch Wikipedia

• OSIRIS — For other uses, see Osiris (disambiguation). OSIRIS is the name of three entirely separate astronomical instruments. The duplication of names is coincidental, partly driven by two scientific teams trying to make acronyms using similar words.… …   Wikipedia

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• Active galactic nucleus — An active galactic nucleus (AGN) is a compact region at the centre of a galaxy which has a much higher than normal luminosity over some or all of the electromagnetic spectrum (in the radio, infrared, optical, ultra violet, X ray and/or gamma ray… …   Wikipedia