Messier 49

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Galaxy
Messier 49
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Photo from the Hubble Space Telescope
Photo from the Hubble Space Telescope
AladinLite
Constellation Virgin
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 12 h 29 m 46.7 s
declination + 08 ° 00 ′ 02 ″
Appearance
Morphological type E2 / S0;
Sy2 LINER  
Brightness  (visual) 8.3 mag
Brightness  (B-band) 9.3 mag
Angular expansion 10.2 ′ × 8.3 ′
Position angle 155 °
Surface brightness 13.2 mag / arcmin²
Physical data
Affiliation Virgo Galaxy
Cluster , LGG 292  
Redshift 0.003272 ± 0.000017  
Radial velocity (+981 ± 5) km / s  
Stroke distance
v rad  / H 0 		(41 ± 3)  x  10 6  ly
(12.5 ± 0.9)  Mpc 
history
discovery Charles Messier
Discovery date February 19, 1771
Catalog names
M  49 • NGC  4472 • UGC  7629 • PGC  41220 • CGCG  42-134 • MCG  + 01-32-083 • 2MASX  J12294679 + 0800014 • VCC  1226 • Arp  134 • GC  3021 • H  I 7 • h  1294 • 0904 NED146

Messier 49 (also known as NGC 4472 ) is an 8.3 mag bright elliptical galaxy with an area of ​​10.2 '× 8.3' in the constellation Virgo . Together with the irregular galaxy UGC 7636 , this forms an entry in the Arp catalog ( Arp 134 ). Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of elliptical galaxies with nearby fragments (Arp catalog) .

Messier 49 was the first galaxy in the Virgo Galaxy Cluster to be found. It was discovered on February 19, 1771 by Charles Messier . M49 is also the brightest member of this galaxy cluster, which is about 41 million light years away. Just like the two galaxies M60 and M87 , which are also members of this cluster, M49 is a giant elliptical galaxy that has a bright compact core and a wide, diffuse halo . In the Hubble sequence , this galaxy is given the type E2. It is the main galaxy of the southern subgroup Cluster B of the Virgo Cluster.

The galaxy has a system of globular clusters , but with around 7000 members it is far smaller than the globular cluster system of M87 . As determined by the XMM-Newton satellite , one of the brightest of these globular clusters emits powerful X-rays. Scientists suspect that the source is a black hole in the center of the globular cluster.

Web links

Commons : Messier 49  - album with pictures, 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 NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 4472
  3. ↑ Seligman
  4. ^ TJ Maccarone et al .: A black hole in a globular cluster . In: Nature . tape 445 , 2007, pp. 183-185 , doi : 10.1038 / nature05434 .