NGC 4889

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Galaxy
NGC 4889 / NGC 4884
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The elliptical galaxy NGC 4889 (left) captured by the Hubble Space Telescope
The elliptical galaxy NGC 4889 (left) captured by the Hubble Space Telescope
AladinLite
Constellation Berenike's hair
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 13 h 00 m 08.1 s
declination + 27 ° 58 ′ 37 ″
Appearance
Morphological type cD; E4; Dd / PAS  
Brightness  (visual) 11.5 likes
Brightness  (B-band) 12.5 mag
Angular expansion 2.8 ′ × 2 ′
Position angle 80 °
Surface brightness 13.4 mag / arcmin²
Physical data
Affiliation Coma Pile
Abell 1656  
Redshift 0.021665 ± 0.000043  
Radial velocity (6495 ± 13) km / s  
Stroke distance
v rad  / H 0 		(291 ± 20)  x  10 6  ly
(89.2 ± 6.2)  Mpc 
history
discovery Wilhelm Herschel
Discovery date April 11, 1785
Catalog names
NGC  4889/4884 • UGC  8110 • PGC  44715 • CGCG  160-241 • MCG  + 05-31-077 • 2MASX  J13000809 + 2758372 • GC  3351 • H  II 391 • h  1507 • LDCE 0926 NED051

NGC 4889 is a very large elliptical galaxy in the constellation Haar der Berenike , located almost in the center of the Coma Cluster and about 291 million light years from the Milky Way.

It is of the cD galaxy type and dominates - together with a second, somewhat weaker giant galaxy called NGC 4874 - the gravity field of the galaxy cluster . The two star systems are very old and probably formed from the merging of several small spiral galaxies .

NGC 4889 was discovered on April 11, 1785 by the German-British astronomer Wilhelm Herschel . In 1973, Jack Sulentic and William Tifft declared the galaxy NGC 4884, described by Heinrich Ludwig d'Arrest on April 6, 1864, to be identical to NGC 4889 in the RNGC .

In the center of NGC 4889 is the largest black hole that has been directly measured to date (as of December 2019) , with a mass of an estimated 21 billion solar masses ('best fit' from the range 6 to 37 billion solar masses).

Web links

Individual evidence

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 4889
  3. ↑ Seligman
  4. ^ Nicholas J. McConnell: Two ten-billion-solar-mass black holes at the centers of giant elliptical galaxies . Nature. December 8, 2011. Archived from the original on December 6, 2011. Retrieved on December 6, 2011.