NGC 4945

Database links to NGC 4945

Galaxy NGC 4945
ESO : image taken by the 2.2 m telescope in the La Silla Observatory
AladinLite
Constellation	centaur
Position equinox :  J2000.0 , epoch : J2000.0
Right ascension	13 h 05 m 27.477 s
declination	-49 ° 28 ′ 05.57 ″
Appearance
Morphological type	SB (s) cd: / sp / Sy2
Brightness  (visual)	8.6 likes
Brightness  (B-band)	9.3 mag
Angular expansion	19.8 ′ × 4 ′
Position angle	43 °
Surface brightness	13.2 mag / arcmin²
Physical data
Affiliation	M83 group NGC 5128 group LGG 344
Redshift	0.001878 ± 0.000010
Radial velocity	563 ± 3 km / s
Stroke distance v rad  / H 0	(17 ± 1)  x  10 6  ly (5.28 ± 0.38)  Mpc
diameter	80,000 ly
history
discovery	James Dunlop
Discovery date	April 29, 1826
Catalog names
NGC  4945 • PGC  45279 • ESO  219-024 • IRAS  13025-4911 • 2MASX  J13052727-4928044 • SGC  130231-4912.2 • GC  3386 • h  3459 • HIPASS J1305-49 • LDCE 993 NED001 • WISEA J130527.45-492804.9

NGC 4945 is a bar-spiral galaxy of the Hubble type SBc in the constellation Centaur in the southern sky . It is an estimated 17 million light rays from the Milky Way and is approximately 140,000 light years across. The galaxy belongs to the so-called Seyfert galaxies , a special type of active galaxies whose centers emit far more energy than quieter galaxies like our Milky Way. A special feature is their very strong H ₂ O maser emission.

Together with seven other galaxies, it forms the NGC 5128 group ( LGG 344 ).
The galaxy NGC 4976 is located in the same area of ​​the sky .

On February 8, 2005, the Type IIP supernova SN2005af was discovered here .

The object was discovered by James Dunlop on April 29, 1826 .

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  ESO: detailed display

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  Detailed study using the Hubble Space Telescope

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  ESO: Infrared image at 2.2 µm - the supermassive black hole in the center emerges.

See also

• PGC 45380 (also NGC 4945A )

Web links

Commons : NGC 4945  - collection of images, videos, and audio files

• Astronews
• ESO: NGC 4945: Milky Way with a bright core (+ photos & animation) September 2, 2009
• GoBlack
• Nearby Spiral Galaxy NGC 4945 - Astronomy Picture of the Day from July 21, 2002.
• IAS
• Antilhue Chile
• Capella Observatory
• NGC4945
• NGC4945 astro-pics
• Spektrum .de: amateur recordings [1] [2] [3]
• Aladin Lite

Individual evidence

1. ↑ ^{a b c d e} NASA / IPAC EXTRAGALACTIC DATABASE
2. ↑ ^{a b c d e f} SEDS : NGC 4945
3. ↑ http://www.eso.org/public/germany/news/eso0931/
4. ↑ PR Dos Santos, JRD Lepine: Detection of strong H2O emission from galaxy NGC494 . In: Nature . 1979. bibcode : 1979Natur.278 ... 34D .
5. ↑ Simbad
6. ↑ Seligman