NGC 3254

Galaxie
NGC 3254
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Aufnahme mithilfe des Hubble-Weltraumteleskops
AladinLite
SternbildKleiner Löwe
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension10h 29m 19,9s[1]
Deklination+29° 29′ 31″[1]
Erscheinungsbild
Morphologischer TypSA(s)bc / Sy2[1]
Helligkeit (visuell)11,6 mag[2]
Helligkeit (B-Band)12,4 mag[2]
Winkel­ausdehnung4.50 × 1.4[2]
Positionswinkel46°[2]
Flächen­helligkeit13,4 mag/arcmin²[2]
Physikalische Daten
ZugehörigkeitLGG 197[3]
Rotverschiebung0.004520 ± 0.000003[1]
Radial­geschwin­digkeit(1355 ± 1) km/s[1]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(59 ± 4) · 106 Lj
(18,0 ± 1,3) Mpc [1]
Durchmesser75.000 Lj[4]
Geschichte
EntdeckungWilliam Herschel
Entdeckungsdatum13. März 1785
Katalogbezeichnungen
NGC 3254 • UGC 5685 • PGC 30895 • CGCG 154-020 • MCG +05-25-018 • IRAS F10265+2944 • 2MASX J10291992+2929291 • GC 2112 • H I 72 • h 714 • LDCE 734 NED002

NGC 3254 ist eine Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ Sbc im Sternbild Kleiner Löwe am Nordsternhimmel. Sie ist schätzungsweise 59 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 80.000 Lj.

Im selben Himmelsareal befindet sich u. a. die Galaxie NGC 3265.

Das Objekt wurde am 13. März 1785 von Wilhelm Herschel entdeckt.[5]

NGC 3254-Gruppe (LGG 197)

GalaxieAlternativnameEntfernung/Mio. Lj
NGC 3254PGC 3089559
NGC 3245PGC 3074457
NGC 3265PGC 3102957
NGC 3277PGC 3116661
PGC 30714NGC 3245A57

Weblinks

Einzelnachweise

  1. ↑ a b c d NASA/IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS: NGC 3254
  3. ↑ VizieR
  4. ↑ NASA/IPAC
  5. ↑ Seligman

Auf dieser Seite verwendete Medien

NGC3254 - SDSS DR14.jpg
Autor/Urheber: Sloan Digital Sky Survey, Lizenz: CC BY 4.0
Color mapping
The sky image is obtained by Sloan Digital Sky Survey, DR14 with SciServer.

Angle of view: 4' × 4' (0.3" per pixel), north is up.

Details on the image processing pipeline: https://www.sdss.org/dr14/imaging/jpg-images-on-skyserver/
NGC3254 - HST - Potw2124a.jpg
Autor/Urheber:

Credit:

ESA/Hubble & NASA, A. Riess et al., Lizenz: CC BY 4.0
A Galactic Powerhouse

This image shows the spiral galaxy NGC 3254, observed using Hubble's Wide Field Camera 3 (WFC3). WFC3 has the capacity to observe ultraviolet, visible and near-infrared light, and this image is a composite of observations taken in the visible and infrared. In this image, NGC 3254 looks like a typical spiral galaxy, viewed side-on. However, NGC 3254 has a fascinating secret that it is hiding in plain sight — it is a Seyfert galaxy, meaning that it has an extraordinarily active core, known as an active galactic nucleus, which releases as much energy as the rest of the galaxy put together.

Seyfert galaxies are not rare — about 10% of all galaxies are thought to be Seyfert galaxies. They belong to the class of “active galaxies” — galaxies that have supermassive black holes at their centres that are actively accreting material, which releases vast amounts of radiation as it is accreted. There is a second, far more active, type of active galaxy that is known as a quasar. The active cores of Seyfert galaxies, such as NGC 3254, are brightest when observed in light outside the visible spectrum. At other wavelengths, this image would look very different, with the galaxy’s core shining extremely brightly.

Credit:

ESA/Hubble & NASA, A. Riess et al. 


Coordinates
Position (RA):  	10 29 23.83
Position (Dec): 	29° 30' 6.70"
Field of view:  	2.41 x 2.03 arcminutes
Orientation:    	North is 7.3° left of vertical

Colours & filters Band	Wavelength	Telescope
Optical Long pass   	350 nm   	Hubble Space Telescope WFC3
Optical V           	555 nm   	Hubble Space Telescope WFC3
Optical I           	814 nm   	Hubble Space Telescope WFC3
Infrared H          	1.6 μm   	Hubble Space Telescope WFC3
.