NGC 4605

Galaxie
NGC 4605
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Die Galaxie NGC 4605 aufgenommen von Hubble-Weltraumteleskop
AladinLite
SternbildGroßer Bär
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension12h 39m 59,4s[1]
Deklination+61° 36′ 33″[1]
Erscheinungsbild
Morphologischer TypSB(s)c pec/HII[1]
Helligkeit (visuell)10,1 mag[2]
Helligkeit (B-Band)10,8 mag[2]
Winkel­ausdehnung5,9′ × 2,4′[2]
Positionswinkel125°[2]
Flächen­helligkeit12,8 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitM81-Gruppe[1]
Rotverschiebung0,000454 ± 0,000010[1]
Radial­geschwin­digkeit136 ± 3 km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(11 ± 1) · 106 Lj
(3,37 ± 0,25) Mpc [1]
Durchmesser20.000 Lj
Geschichte
EntdeckungWilhelm Herschel
Entdeckungsdatum19. März 1790
Katalogbezeichnungen
NGC 4605 • UGC 7831 • PGC 42408 • CGCG 293-031 • MCG +10-18-074 • IRAS 12378+6152 • 2MASX J12395938+6136330 • GC 3142 • H I 254 • h 1381 • LDCE 0842 NED008

NGC 4605 ist eine Balkenspiralgalaxie vom Hubble-Typ SBc/P im Sternbild Großer Bär. Die Zwerggalaxie ist etwa 11 Millionen Lichtjahren von der Milchstraße entfernt und gehört zur M81-Gruppe, einer der uns nächstgelegenen Galaxiengruppen[3].

Sie wurde am 19. März 1790 von dem deutsch-britischen Astronomen Friedrich Wilhelm Herschel entdeckt.[4]

Weblinks

Commons: NGC 4605 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 4605
  3. ↑ http://www.astronews.com/bilddestages/2014/20140506.shtml
  4. ↑ Seligman

Auf dieser Seite verwendete Medien

Potw1418a.tif
Autor/Urheber: Credit: ESA/Hubble & NASA Acknowledgement: Det58, Lizenz: CC BY 3.0
The scale of the Universe


This bundle of bright stars and dark dust is a dwarf spiral galaxy known as NGC 4605, located around 16 million light-years away in the constellation of Ursa Major (The Great Bear). This galaxy’s spiral structure is not obvious from this image, but NGC 4605 is classified as an SBc type galaxy — meaning that it has sprawling, loosely wound arms and a bright bar of stars cutting through its centre.

NGC 4605 is a member of the Messier 81 group of galaxies, a gathering of bright galaxies including its namesake Messier 81 (heic0710), and the well-known Messier 82 (heic0604a). Galaxy groups like this usually contain around 50 galaxies, all loosely bound together by gravity. This group is famous for its unusual members, many of which formed from collisions between galaxies. With its somewhat unusual form, NGC 4605 fits in well with the family of perturbed galaxies in the M81 group, although the origin of its abnormal features is not yet clear.

The Messier 81 group is one of the nearest groups to our own, the Local Group, which houses the Milky Way and some of its well-known neighbours, including the Andromeda Galaxy and the Magellanic Clouds. Galaxy groups provide environments where galaxies can evolve through interactions like collisions and mergers. These galaxy groups are then lumped together into even larger gatherings of galaxies known as clusters and superclusters. The Local and Messier 81 groups both belong to the Virgo Supercluster, a large and massive collection of some 100 galaxy groups and clusters.

With so many galaxies swarming around, NGC 4605 may seem unremarkable. However, astronomers are using this galaxy to test our knowledge of stellar evolution. The newly-formed stars in NGC 4605 are being used to investigate how interactions between galaxies affect the formation, evolution, and behaviour of the stars within, how bright stellar nurseries come together to form stellar clusters and stellar associations, and how these stars evolve over time.

And that's not all — NGC 4605 is also proving to be a good testing ground for dark matter. Our theories on this hypothetical type of matter have had good success at describing how the Universe looks and behaves on a large scale — for example at the galaxy supercluster level — but when looking at individual galaxies, they have run into problems. Observations of NGC 4605 show that the way in which dark matter is spread throughout its halo is not quite as these models predict. While intriguing, observations in this area are still inconclusive, leaving astronomers to ponder over the contents of the Universe.

Credit:

ESA/Hubble & NASA Acknowledgement: D. Calzetti (University of Massachusetts) and the LEGUS Team


About the Object 

Name:	NGC 4605
Type:	• Local Universe : Galaxy : Type : Spiral 
       • X - Galaxies Images/Videos
Distance:	15 million light years

Colours & filters 

Band	Wavelength	Telescope
Infrared I 	814 nm 	Hubble Space Telescope WFC3
Optical V 	555 nm 	Hubble Space Telescope WFC3
Optical B 	438 nm 	Hubble Space Telescope WFC3
Ultraviolet U 	336 nm 	Hubble Space Telescope WFC3
Ultraviolet U 	275 nm 	Hubble Space Telescope WFC3
.