CHE SIGNIFICA SEYFERT GALAXY IN INGLESE
Seyfert galassia
Le galassie di Seyfert sono uno dei due più grandi gruppi di galassie attive, insieme a quasari. Hanno nuclei simili a quasar con luminosità superficiali molto elevate i cui spettri rivelano forti linee di emissione ad alta ionizzazione, ma a differenza dei quasar, le loro galassie ospite sono chiaramente rilevabili. Le galassie di Seyfert rappresentano circa il 10% di tutte le galassie e sono alcuni degli oggetti più studiati in astronomia, in quanto sono considerati alimentati dagli stessi fenomeni che si verificano nei quasar, sebbene siano più vicini e meno luminosi dei quasari. Queste galassie hanno buchi neri supermassici nei loro centri circondati da dischi di accrescimento di materiale in caduta. Si ritiene che i dischi di accrescimento siano la fonte della radiazione ultravioletta osservata. Le linee di emissione e assorbimento ultraviolette forniscono la migliore diagnostica per la composizione del materiale circostante. Viste in luce visibile, la maggior parte delle galassie di Seyfert sembrano le galassie a spirale normale, ma quando studiata sotto altre lunghezze d'onda, risulta chiaro che la luminosità dei loro nuclei è di intensità paragonabile alla luminosità delle galassie intere della dimensione della Via Lattea.
definizione di Seyfert galaxy nel dizionario inglese
La definizione di galassia di Seyfert nel dizionario è una classe di galassie a spirale con un nucleo molto luminoso, che potrebbe corrispondere a un periodo attivo nella vita di tutte le galassie a spirale.
PAROLE IN INGLESE ASSOCIATE CON «SEYFERT GALAXY»
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10 LIBRI IN INGLESE ASSOCIATI CON «SEYFERT GALAXY»
Scopri l'uso di
Seyfert galaxy nella seguente selezione bibliografica. Libri associati con
Seyfert galaxy e piccoli estratti per contestualizzare il loro uso nella letteratura.
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 NOTIZIE DOVE SI INCLUDE IL TERMINE «SEYFERT GALAXY»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
Seyfert galaxy nel contesto delle seguenti notizie.
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, apr 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, gen 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, ago 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, lug 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, lug 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, lug 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, giu 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, mar 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, dic 12»