NGC 7674

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Galaxy
NGC 7674
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NGC7674 (m) & “NGC 7674A” (u) with LEDA 71507 [1] (Hubble space telescope).
NGC7674 (m) & “NGC 7674A” (u) with LEDA 71507 ( Hubble space telescope ).
AladinLite
Constellation Pegasus
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 23 h 27 m 56.7 s
declination + 08 ° 46 ′ 45 ″
Appearance
Morphological type SA (r) bc / pec / HII / Sy2  
Brightness  (visual) 13.1 mag
Brightness  (B-band) 13.9 likes
Angular expansion 1.1 ′ × 1 ′
Position angle 150 °
Surface brightness 13.1 mag / arcmin²
Physical data
Affiliation HCG 96
WBL 716  
Redshift 0.028924 ± 0.000030  
Radial velocity (8671 ± 9) km / s  
Stroke distance
v rad  / H 0 		(394 ± 28)  ·  10 6  ly
(120.8 ± 8.5)  Mpc 
history
discovery John Herschel
Discovery date August 16, 1830
Catalog names
NGC  7674 • UGC  12608 • PGC  71504 • CGCG  406-112 • MCG  + 01-59-080 • IRAS  23254 + 0830 • KUG  2325 + 085 • 2MASX  J23275670 + 0846443 • Arp  182 • HCG  96A • VV  343a • GC  4968 • h  2243 • GALEX ASC J232756.81 + 084644.9

NGC 7674 is an active bar-spiral galaxy with extensive star formation regions of the Hubble type SBbc in the constellation Pegasus in the northern sky . It is an estimated 394 million light years away from the Milky Way and about 130,000 light years in diameter. Together with PGC 71505 ( NGC 7674A ) it forms the interacting galaxy pair Arp 182 and together with NGC 7675 and PGC 71507 the galaxy quartet HCG 96 .

Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This galaxy belongs to the class of narrow filament galaxies .

In September 2017, a double supermassive black hole was observed here using Very Long Baseline Interferometry (VLBI). These are two objects orbiting each other at a distance of 1.1 light years with a total mass of 36 million solar masses .

The object was discovered by John Herschel on August 16, 1830 .

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

Web links

Commons : NGC 7674  - collection of images, videos, and audio files

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e NGC 7674
  4. ^ Rainer Kayser: Double Black Hole Observed , Welt der Physik, September 18, 2017, accessed on September 20, 2017.
  5. ↑ Seligman