NGC 4395

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Galaxy
NGC 4395
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NGC 4395 imaged with the 81 cm reflecting telescope of the Mount Lemmon Observatory
NGC 4395 imaged with the 81 cm reflecting telescope of the Mount Lemmon Observatory
AladinLite
Constellation Hunting dogs
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 12 h 25 m 48.8 s
declination + 33 ° 32 ′ 49 ″
Appearance
Morphological type SA (s) m :;
LINER Sy1.8  
Brightness  (visual) 10.0 mag
Brightness  (B-band) 10.6 mag
Angular expansion 13 ′, 2 × 11 ′, 0
Position angle 147 °
Surface brightness 15.3 mag / arcmin²
Physical data
Affiliation Canes Venatici I group , LGG 291  
Redshift +0.001064 +/- 0.000004  
Radial velocity +319 ± 1 km / s  
Stroke distance
v rad  / H 0 		(15 ± 1)  x  10 6  ly
(4.59 ± 0.32)  Mpc 
diameter 55,000 ly
history
discovery Wilhelm Herschel
Discovery date January 2, 1786
Catalog names
NGC  4395 • UGC  7524 • PGC  40596 • CGCG  187-42 • MCG  + 06-27-053 • IRAS  12233 + 3348 • KUG  1223 + 338 • 2MASX  J12254892 + 3332482 • GC  2958 • H  V 29 (1) • h  1252 • LJHY 102 • BTS 135 • INTREF 495

NGC 4395 is a barred spiral galaxy of the Hubble type SA (n) m? in the constellation hounds in the north star sky. It is 15 million light years away from the Milky Way and 55,000 light years across. The property is a member of the Canes Venatici I group .
It is an active galaxy with a very bright center ; H. with an active galactic core (AGN), it is a Seyfert-1 galaxy .

Special

In NGC  4395, British and Japanese scientists working with Kazushi Iwasawa and Andrew Fabian from Cambridge University , using the Japanese X-ray satellite "Advanced Satellite for Cosmology and Astrophysics" ( ASCA ), found that at the time of publication in 2000, the smallest massive black hole with a Mass from 10,000 to 100,000 solar masses found. Thus it was 100 times smaller than all black holes of this type known to date. A short time later, an even smaller hole was discovered in the galaxy M82 .

There are also several H-II regions in the galaxy , three of which have found their way into the New General Catalog as separate objects : NGC 4399 , NGC 4400 and NGC 4401 .

NGC 4395 was discovered on January 2, 1786 by the German-British astronomer Wilhelm Herschel .

Web links

Commons : NGC 4395  - collection of images, videos, and audio files

swell

  1. ↑ a b c d e NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c d e SEDS : NGC 4395
  3. ^ General study of group membership. II - Determination of nearby groups 1993
  4. ^ A b Richard Powell, The Canes I Group - An Atlas of the Universe
  5. ↑ Max Planck Institute for Extraterrestrial Physics. (No longer available online.) Archived from the original on November 18, 2007 ; Retrieved December 29, 2007 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.mpe.mpg.de
  6. ↑ Heise. Retrieved December 29, 2007 .
  7. ↑ Astronews. Retrieved December 29, 2007 .
  8. ↑ Astronomie.de. (No longer available online.) Archived from the original on June 14, 2007 ; Retrieved December 29, 2007 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.astronomie.de
  9. ^ NED regions. Retrieved December 29, 2007 .
  10. ↑ Seligman