Extragalactic astronomy
Extragalactic astronomy is the branch of astronomy concerned with objects outside our own Milky Way Galaxy (the study of all astronomical objects which are not covered by galactic astronomy).
Extragalactic Radio Sources
A close look at the structure of radio sources around active nuclei is shown in this montage of NGC 6251, ...
Extragalactic Distance Measures
The trick to determining the distance to a galaxy is to find in that galaxy a standard candle, an object that has a known luminosity.
Extragalactic Sources of Radio Waves
Radio waves also come from outside the Milky Way. These extragalactic radio sources have great implications for cosmology, the theory of the overall structure of the universe.
Extragalactic astronomy: gravitational lensing. This Hubble Space Telescope image shows several blue, loop-shaped objects that actually are multiple images of the same galaxy.
extragalactic
Outside of, or beyond, our own galaxy.
F
Fast Fourier Transformation (FFT) ...
Extragalactic
a term that means outside of or beyond our own galaxy.
Extraterrestrial
a term used to describe anything that does not originate on Earth.
Extragalactic Astronomy
The field that deals with objects beyond the Milky Way, especially galaxies and quasars. [C95]
Extragalactic Distance Scale ...
Extragalactic detection
NH3 has been detected in external galaxies, and by simultaneously measuring several lines, it is possible to directly measure the gas temperature in these galaxies.
EXTRAGALACTIC
Extragalactic means outside of, or beyond, our galaxy (the Milky Way Galaxy).
...
This extragalactic globular cluster in Sagittarius was discovered by Messier on July 24, 1778. Its host galaxy, Sagittarius Spheroidal Dwarf, is being disrupted by our Milky Way and was itself discovered only in 1994! ...
Extragalactic radio sources are objects that emit a continuum of radio wavelengths and that lie beyond the confines of the Galaxy were divided in the 1950s into two classes depending on whether they present spatially extended or essentially ...
Extragalactic Outside our galaxy.
F
Flux The rate of particle flow over time.
In extragalactic studies, the observed luminosities and colors of objects participating in the expansion of the Universe are known to require procedural corrections for two physically distinct, but redshift-related, ...
See Extragalactic cosmic ray.
Ultra-high-energy cosmic rays
See Ultra-high-energy cosmic ray.
Anomalous cosmic rays ...
"The extragalactic background is very faint, and it is easily confused with the bright emission from the Milky Way," says Ackermann.
Main article: Extragalactic astronomy
The study of objects outside of our galaxy is a branch of astronomy concerned with the formation and evolution of Galaxies; their morphology and classification; and the examination of active galaxies, ...
extragalactic (NASA SP-7, 1965) Outside our galaxy, which is the Milky Way. extragalactic radio sources (AS&T Dictionary) A radio frequency emitting source that lies outside the Milky Way.
Galactic and Extragalactic Astronomy
From the stars, we move on to nodes about galaxies. Galaxies are huge aggregations of matter that formed from faint ripples of density in the early universe.
Any of a class of extragalactic objects also known as quasars, characterized by emission lines with very large redshifts.
Determination of Extragalactic Distances.
In viewing a galaxy with a telescope, inferring its distance is impossible, for it may be a gigantic galaxy at a large distance or a smaller one closer to earth.
This allows them to be used as "standard candles" and are thus important distance indicators for the extragalactic distance scale. Chandrasekhar limit The theoretical upper limit at which a stellar remnant can form a white dwarf.
Even if UHECRs are created in extreme extragalactic environments, it is still not clear how we are able to detect them at such high energies.
BOOMERANG (Balloon Observations Of Milli-metric Extragalactic Radiation And Geophysics) is an instrument designed to measure anisotropies in the Cosmic Microwave Background Radiation (CMBR).
Extragalactic objects (red dots in figure) do exist in this region of sky, but the extinction through the Galactic plane is very high (Galactic dust and dense gas absorb light from background sources).
The more type Ia supernovae that are observed, the more the extragalactic distance scale can be refined. The importance of nearby supernovae is to correctly calibrate the scale with a closer measurement stick - cepheid variable stars.
extragalactic background light (EBL)
extragalactic reference frame
Extrasolar Planet Observational Research Team (EXPORT)
extrasolar planets
extrasolar planets, detection
extrasolar planets, searches
extreme horizontal branch star (EHB star) ...
Edwin Hubble settled the debate in 1925 when he identified extragalactic Cepheid variable stars for the first time on astronomical photos of M31. These were made using the 2.
Now, thanks to the Hubble Space Telescope, we have the deepest, most detailed optical view of extragalactic space yet obtained. Called the Hubble Deep Field, it is shown here in approximately true color.
Why is finding accurate extragalactic distances so important?
What are the more accurate or more certain ways to measure distances? What are the less accurate (less certain) ways to measure distances?
Stellar, Galactic & Extragalactic Astronomy Ohio State University
Sea of Galilee Astrophysical Observatory
University of St. Andrews
St. Andrews Physics and Astronomy Dept.
(Tonry, J. and Schneider, D. "A New Technique for Measuring Extragalactic Distances." Astron. J. 96, 807, 1988)
(according to Andrew Young: Not only is the "full Moon" a fiction; so is the "vernal equinox".)
(--. Sky & Telescope, 350, Oct. 1991.) ...
Quasar -- Quasi-stellar object observed mainly in radio waves. Quasars are extragalactic objects believed to be the very distant centers of active galaxies.
RA -- Right Ascension.
Definition: quasi-stellar source (QSS): Sometimes also called quasi-stellar object (QSO A stellar-appearing object of very large redshift that is a strong source of radio waves; presumed to be extragalactic and highly luminous._z_space_z_); ...
Over the past decade, he had developed wonderful "visualizations" of recently discovered extrasolar planetary systems, protoplanetary disks, extragalactic worlds, and Massive Compact Halo Objects (MACHOS), which were admired internationally.
earliest and most important of these confirmations were by the Millimeter Anisotropy eXperiment IMaging Array (MAXIMA), a balloon-borne experiment led by UC Berkeley physicist Paul Richards, and the Balloon Observations Of Millimetric Extragalactic ...
They are galactic radio waves if their origin is within our galaxy and extragalactic radio waves if their origin is outside our galaxy. Solar radio waves emanate from the sun.
 See also: Galaxy, Galaxies, Light, Universe, Time
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