Messier 90

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Galaxy
Messier 90
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Image of the central area of ​​Messier 90, created using the Hubble Space Telescope
Image of the central area of ​​Messier 90, created using the Hubble Space Telescope
AladinLite
Constellation Virgin
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 12 h 36 m 49.8 s
declination + 13 ° 09 ′ 47 ″
Appearance
Morphological type SAB (rs) ab; LINER; Sy  
Brightness  (visual) 9.4 mag
Brightness  (B-band) 10.2 mag
Angular expansion 9.5 ′ × 4.4 ′
Position angle 23 °
Surface brightness 13.3 mag / arcmin²
Physical data
Affiliation Virgo Galaxy Clusters  
Redshift −0.000784 ± 0.000013  
Radial velocity (−235 ± 4) km / s  
Stroke distance
v rad  / H 0 		(44 ± 8)  x  10 6  ly
(13.5 ± 2.5)  Mpc 
Dimensions approx. 5 × 1012 M☉ M ☉
history
discovery Charles Messier
Discovery date March 18, 1781
Catalog names
M  90 • NGC  4569 • UGC  7786 • PGC  42089 • CGCG  70-192 • MCG  + 2-32-155 • IRAS  12343 + 1326 • VCC  1690 • Arp  76 • GC  3111 •

Messier 90 (also known as NGC 4569) is a 9.4 mag bright bar-spiral galaxy with an area of ​​9.5 '× 4.4' in the constellation Virgo . The galaxy is a member of the Virgo galaxy cluster and is believed to be gravitationally coupled to the galaxy IC 3583 ( Arp 76 ). Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class spiral galaxies with a small companion of high surface brightness on one arm (Arp catalog) .

Messier 90 is a Sab-type galaxy in the Hubble sequence , but appears to be quite old for a galaxy of this type. The galaxy has no star formation regions and it is therefore believed that the galaxy will evolve into a lenticular system with no S0-type spiral arms.

The distance has been determined variously, mainly with the help of the Tully-Fisher relationship , with values ​​ranging from 9.3 to 16.8  Mpc .

In contrast to the similarly large galaxy Messier 89 , which is only 0.6 ° south, it is moving towards us at almost the same speed . This can be explained by the dynamics of the very massive Virgo Cluster.

The galaxy was discovered on March 18, 1781 by the French astronomer Charles Messier .

  • Messier 90 (center) and IC 3583 (top), SDSS false color image: Visible spectral range and near infrared , angle of view 14 'x 14'

  • Messier 90 (center) and IC 3583 (top), image of the ultraviolet radiation, GALEX

Web links

Commons : Messier 90  - 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 NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 4569
  3. ↑ Seligman