water masers

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• Megamaser — A megamaser is a type of astrophysical maser, which is a naturally occurring source of stimulated spectral line emission. Megamasers are distinguished from astrophysical masers by their large isotropic luminosity. Megamasers produce roughly 103… …   Wikipedia

• Astrophysical maser — An astrophysical maser is a naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum. This emission may arise in molecular clouds, comets, planetary atmospheres, stellar… …   Wikipedia

• Maser — For other uses, see Maser (disambiguation). A hydrogen radio frequency discharge, the first element inside a hydrogen maser (see description below) A maser is a device that produces coherent electromagnetic waves through amplification by… …   Wikipedia

• Messier 106 — M 106 and its anomalous arms. Composite of IR, x ray, radio and visible light view (X ray blue, Optical gold, IR red, Radio purple; Image credit: NASA/CXC/University of Maryland) Observation data (J2000 epoch) …   Wikipedia

• Very Long Baseline Interferometry — (VLBI) is a type of astronomical interferometry used in radio astronomy. It allows observations of an object that are made simultaneously by many telescopes to be combined, emulating a telescope with a size equal to the maximum separation between …   Wikipedia

• Galaxia espiral M77 — Cetus A Descubrimiento Descubridor Pierre Méchain …   Wikipedia Español

• Triangulum Galaxy — Messier 33 Observation data (J2000 epoch) Pronunciation /traɪˈæŋɡjʉləm/ …   Wikipedia

• Supermassive black hole — A supermassive black hole is a black hole with a mass of an order of magnitude between 105 and 1.8x 1010 solar masses. Most if not all galaxies, including the Milky Way [ Seeing a Star Orbit around the Supermassive Black Hole at the centre of the …   Wikipedia

• Messier 77 — Cetus A Spiral Galaxy M77 Observation data (J2000 epoch) Constellation Cetus …   Wikipedia

• Reverberation mapping — is to day a statistical method within astrophysics preferably used in connection with velocity analysis of gaseous discs around supermassive compact objects. The technique is used to measure the size of the broad emission line region and mass of… …   Wikipedia

• Westerhout 49 — Westerhout 49, also known as W49, is a strong galactic thermal radio source characteristic of an HII region. It was discovered by Gart Westerhout in 1958. Its distance is estimated to be about 14 15 kpcs and it lies in the galactic plane about… …   Wikipedia