NGC 4651

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Galaxy
NGC 4651
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NGC 4651, the Umbrella Galaxy
NGC 4651, the Umbrella Galaxy
AladinLite
Constellation Berenike's hair
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 12 h 43 m 42.6 s
declination + 16 ° 23 ′ 36 ″
Appearance
Morphological type SA (rs) c LINER  
Brightness  (visual) 10.6 mag
Brightness  (B-band) 11.3 mag
Angular expansion 4 ′ × 2.7 ′
Position angle 80 °
Surface brightness 13.0 mag / arcmin²
Physical data
Affiliation LGG 289  
Redshift 0.002625 ± 0.000007  
Radial velocity (+798 ± 2) km / s  
Stroke distance
v rad  / H 0 		(34 ± 2)  x  10 6  ly
(10.3 ± 0.7)  Mpc 
history
discovery William Herschel
Discovery date December 30, 1783
Catalog names
NGC  4651 • UGC  7901 • PGC  42833 • CGCG  100-004 • MCG  + 03-33-001 • IRAS  12412 + 1639 • 2MASX  J12434262 + 1623362 • Arp  189 • VV  56 • GC  3184 • H  II 12 • h  1409 • Kara 549

NGC 4651 = Arp 189 , also called Umbrella Galaxy , is a spiral galaxy of the Hubble type SA (rs) c pec in the constellation Haar der Berenike in the northern sky . It is about 34 million light years from the Milky Way . It has a filament-like structure of ancient stars that extends eastward for more than 50,000 light-years like a jet and ends in an umbrella-like appendage. Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of narrow filament galaxies .

Apparently, six to ten billion years ago, a dwarf galaxy got into the gravitational field and was slowly pulled apart by the tidal forces along its orbit around its bigger sister. This leads to a loose group of stars winding around the parent galaxy as a stellar current , moving particularly slowly at the apex and having the highest star density there.

The object was discovered on December 30, 1783 by the German-British astronomer Friedrich Wilhelm Herschel .

Web links

Commons : NGC 4651  - collection of images, videos, and audio files

literature

  • Jeff Kanipe, Dennis Webb: The Arp Atlas of Peculiar Galaxies - A Chronicle and Observer's Guide. Richmond 2006, ISBN 978-0-943396-76-7 .

Individual evidence

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 4651
  3. ↑ Nadja Podbregar: Milky Way twin is a cannibal. Astronomers detect the remains of intertwined dwarf galaxies in the umbrella galaxy. In: scinexx . MMCD NEW MEDIA, July 2, 2014, accessed July 25, 2014 .
  4. ↑ Stars and Space . December 2011, p. 12f.
  5. ↑ Seligman