Messier 32

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Galaxy
Messier 32
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Utraviolet Light Source in an Old Galaxy (9464531619) .jpg
Photo from the Hubble Space Telescope
AladinLite
Constellation Andromeda
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 00 h 42 m 41.8 s
declination + 40 ° 51 ′ 55 ″
Appearance
Morphological type cE2 / AGN  
Brightness  (visual) 8.1 likes
Brightness  (B-band) 9.2 likes
Angular expansion 8.5 ′ × 6.5 ′
Position angle 179 °
Surface brightness 12.5 mag / arcmin²
Physical data
Affiliation Local group , LGG 01  
Redshift −0.000667 ± 0.000020  
Radial velocity (−200 ± 6) km / s  
distance approx. 2.3 million  ly  
Dimensions 3  ·  10 9 M ☉
diameter 8000 ly
history
discovery Guillaume Le Gentil
Discovery date October 29, 1749
Catalog names
M  32 • NGC  221 • UGC  452 • PGC  2555 • CGCG  535-016 • MCG  + 07-02-015 • IRAS  00399 + 4035 • Arp  168 • GC  117 • h  51 • Ark 12 • Bode 2 • Struve 1

Messier 32 (also known as NGC 221 or Andro-Beta) is an elliptical dwarf galaxy measuring 8.5 '× 6.5' and an apparent magnitude of 8.1 mag in the constellation Andromeda . Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class galaxies with diffuse opposing arms .

M 32 is a companion of the Andromeda galaxy (M 31) and thus part of the local group . Because of the relatively low surface brightness , it is difficult to observe in small telescopes. Messier M 32 is 2.3 million light years away, has a diameter of around 8,000 light years, and has a mass of around 3 billion solar masses . In the vicinity of the center of M 32, star densities of 5000 suns per cubic parsec are reached, as in the central region of the Andromeda galaxy. The mass of the central region is also similar to the central region of the Andromeda galaxy with 100 million solar masses.

About two billion years ago, the Andromeda galaxy absorbed most of M 32. The solar mass before this event is estimated to be 25 billion.

Messier 32 was discovered on October 29, 1749 by the French astronomer Guillaume Le Gentil .

Web links

Commons : Messier 32  - collection of images, videos and audio files

literature

  • Jeff Kanipe and 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 221
  3. ↑ http://www.physik.uni-regensburg.de/forschung/gebhardt/gebhardt_files/skripten/StrukturbildungIu.II.pdf , p. 7
  4. ↑ Andromeda likely consumed the Milky Way's long-lost sibling . In: Astronomy.com . ( astronomy.com [accessed July 24, 2018]).
  5. ↑ Seligman