QUE SIGNIFIE SEYFERT GALAXY EN ANGLAIS
Seyfert galaxy
Les galaxies de Seyfert sont l'un des deux plus grands groupes de galaxies actives, ainsi que des quasars. Ils ont des noyaux de type quasar avec des luminosités de surface très élevées dont les spectres révèlent des lignes d'émission fortes et à haute ionisation, mais à la différence des quasars, leurs galaxies hôtes sont clairement détectables. Les galaxies de Seyfert représentent environ 10% de toutes les galaxies et sont quelques-uns des objets les plus intensément étudiés en astronomie, car ils sont pensés pour être alimentés par les mêmes phénomènes qui se produisent dans les quasars, bien qu'ils soient plus proches et moins lumineux que quasars. Ces galaxies ont des trous noirs supermassifs dans leurs centres qui sont entourés par des disques d'accumulation de matériaux en chute. On croit que les disques d'accrétion sont la source du rayonnement ultraviolet observé. Les lignes d'émission et d'absorption des ultraviolets fournissent les meilleurs diagnostics pour la composition du matériau environnant. Vu sous la lumière visible, la plupart des galaxies de Seyfert ressemblent à des galaxies spirales normales, mais lorsqu'elles sont étudiées sous d'autres longueurs d'onde, il devient clair que la luminosité de leurs noyaux est d'une intensité comparable à la luminosité des galaxies entières à la taille de la Voie lactée.
définition de Seyfert galaxy dans le dictionnaire anglais
La définition de la galaxie de Seyfert dans le dictionnaire est n'importe quelle classe de galaxies spirales ayant un noyau très brillant, correspondant probablement à une période active dans la vie de toutes les galaxies spirales.
MOTS EN ANGLAIS EN RAPPORT AVEC «SEYFERT GALAXY»
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10 LIVRES EN ANGLAIS EN RAPPORT AVEC «SEYFERT GALAXY»
Découvrez l'usage de
Seyfert galaxy dans la sélection bibliographique suivante. Des livres en rapport avec
Seyfert galaxy et de courts extraits de ceux-ci pour replacer dans son contexte son utilisation littéraire.
1
Horizons: Exploring the Universe
But spectra of Seyfert galaxy nuclei contain broad emission lines. Emission lines
are produced by a hot, low-density gas, so the gas in the nuclei of Seyfert
galaxies must be highly excited. The width of the spectral lines suggests large
Doppler ...
Michael Seeds, Dana Backman,
2011
2
Galaxies in Turmoil: The Active and Starburst Galaxies and ...
SEYFERT GALAXY TYPE 1 See Seyfert galaxy. SEYFERT GALAXY TYPE 2 See
Seyfert galaxy. SEYFERT GALAXY TYPE 3 A synonym for LINER – see Seyfert
galaxy and LINER. SY 1 GALAXY See Seyfert galaxy. SY 2 GALAXY See Seyfert
...
3
An Introduction to Active Galactic Nuclei
A Seyfert galaxy has a quasar-like nucleus, but the host galaxy is clearly
detectable. The original definition of the class (Seyfert 1943) was primarily
morphological, i.e., these are galaxies with high surface brightness nuclei, and
subsequent ...
Bradley M. Peterson,
1997
4
A Decade of Rossi X-ray Timing Explorer
Seyfert ...
It appears as though MCG —3-34-64 is the type 1.8 Seyfert galaxy, while the
source named in the accepted proposal, MCG —3-34-63 is not. The separation
between the to is less than 1.8 arcmin. However, the observations of this source
do ...
5
Mass-Transfer Induced Activity in Galaxies
However, the recent literature on the prevalence of Seyfert galaxy companions, is
confusing and somewhat contradictory. To clarify this we have constructed a
statistical profile of Seyfert galaxy companions in the CfA ZCAT. We use a
random ...
6
Fifty Years of Quasars: From Early Observations and Ideas to ...
J. 571, 247–255 (2003) Chu, Y., Wei, J., Hu, J., Zhu, X., Arp, H.: Quasars around
the seyfert galaxy NGC 3516. Astrophys. J. 500, 596 (1998) Chuvaev, K.K.: The
spectrum variations of the galaxy 3C 120. Pis'ma v Astron. Zhurnal 6, 323–328 ...
Mauro D'Onofrio, Paola Marziani, Jack W. Sulentic,
2012
7
Foundations of Astronomy
(a) The Seyfert galaxy NGC 7674 is part of a. Somewhere somet/oing incredible
is waiting to be known. CARL SAGAN UPERMASSIVE BLACK HOLES
containing millions or even billions of solar masses lurk at the centers of most
large ...
Michael Seeds, Dana Backman,
2012
This statistical False-color visual-wavelength image T ida l ta il T id a l t a il 9100
km/s □ Figure 17-2 (a) Seyfert galaxy NGC7674 appears to be distorted by
interacting with its companion galaxies. You can be sure they are a group
because ...
9
Articles on
Seyfert Galaxies, Including:
Seyfert Galaxy, ...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.
10
The Interplay Among Black Holes, Stars and ISM in Galactic ...
Ark 539 (top row) is a Seyfert galaxy that does not appear to be disturbed in the
optical. In HI, however, a tidal bridge can be seen connecting the southern part of
the Seyfert galaxy to a companion galaxy (at the same redshift) to the south-east.
Thaisa Storchi-Bergmann, Luis C. Ho, Henrique R. Schmitt,
2004
10 ACTUALITÉS CONTENANT LE TERME «SEYFERT GALAXY»
Découvrez de quoi on parle dans les médias nationaux et internationaux et comment le terme
Seyfert galaxy est employé dans le contexte des actualités suivantes.
Astronomy Photo of the Day — Seyfert Galaxy NGC 1097
By official designation, NGC 1097 is a Seyfert galaxy—a term used to describe active galaxies with a plethora of highly-ionized gases, mostly seen within the ... «From Quarks to Quasars, avril 15»
Kepler Targets Supermassive Black Hole
KA1858+4850 is a Seyfert galaxy with an active supermassive black hole feeding on ... In 2012, Kepler provided a highly accurate light curve of the galaxy. «Universe Today, janv 15»
Astronomers Measure Distance to Eye of Sauron (NGC 4151)
This image shows the spiral Seyfert galaxy NGC 4151, also known as the Eye of Sauron. ... NGC 4151 is an intermediate spiral Seyfert galaxy located in the ... «Sci-News.com, nov 14»
Astronomy Photo of the Day: 8/4/2014 – NGC 1097
NGC 1097 is a galaxy class known as a Seyfert galaxy. A trademark of these galaxies is the highly ionized gases emitted from the galactic nuclei in a spectral ... «From Quarks to Quasars, août 14»
Hubble Examines Galaxy's Throbbing Heart
Shown here, NGC 1433 is especially active and known as a Seyfert galaxy. Seyferts are amongst the most active 10 percent of galaxies — the central ... «Discovery News, juil 14»
Supermassive black holes belch gas out of evolving galaxies at …
Seyfert galaxy IC 5063 has a giant black hole, spewing gas at over 625,000 miles per hour. For the first time, astronomers know what is driving this massive ... «Tech Times, juil 14»
Supermassive Black Hole in Seyfert Galaxy IC 5063 Surprises …
This image shows the nearby Seyfert galaxy IC 5063. Image credit: Sky-map.org. Supermassive black holes in the cores of some galaxies drive massive ... «Sci-News.com, juil 14»
Swiftly moving gas streamer eclipses supermassive black hole
The newly discovered gas stream in the archetypal Seyfert galaxy NGC 5548 — one of the best-studied sources of this type over the past half-century — absorbs ... «Hubble Space Telescope at ESA, juin 14»
Hubble Uncovers Hidden Mysteries in Messier 77
The galaxy belongs to a class of galaxies known as Seyfert galaxies, which have ... 1780 by Pierre Mechain, this active Seyfert galaxy is magnificent to behold in ... «Universe Today, mars 13»
Hubble eyes spiral galaxy's bright beating heart
NGC 1097 is a Seyfert galaxy. Lurking at the very center of the galaxy, a supermassive black hole 100 million times the mass of our sun is gradually sucking in ... «Astronomy Now Online, déc 12»