Arp 299

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Galaxy
Arp 299
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Hubble Interacting Galaxy NGC 3690 (2008-04-24) .jpg
HST image of the Arp 299 system, IC 694 below left
AladinLite
Constellation Big Bear
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 11 h 28 m 32.3 s
declination + 58 ° 33 ′ 43 ″
Appearance
Morphological type S pec
Sb pec
E-S0  
Brightness  (visual) 11.2 (NGC 3690A)
10.9 (NGC 3690B)
15.0 (IC 694) mag
Brightness  (B-band) 12.0 (NGC 3690A)
11.7 (NGC 3690B)
16.0 (IC 694) mag
Angular expansion 1.6 / 1.4 (NGC 3690A)
2 / 1.4 (NGC 3690B)
0.3 / 0.3 (IC 694)
Position angle 140 ° (NGC 3690A)
130 ° (NGC 3690B)
Surface brightness 11.9 (NGC 3690A)
11.9 (NGC 3690B)
12.5 (IC 694) mag / arcmin²
Physical data
Redshift 0.010411 ± 0.000010
0.013200 ± 0.000100  
Radial velocity 3121 ± 3
3957 ± 30 km / s  
Stroke distance
v rad  / H 0 		(143 ± 10)  ·  10 6  ly
(43.9 ± 3.1)  Mpc 
history
discovery Wilhelm Herschel
Bindon Stoney (IC 694)
Discovery date March 18, 1790
January 27, 1852
Catalog names
NGC  3690 • IC  694 • UGC  6472 • PGC  35321/5/6 • CGCG  291-073 • MCG  + 10-17-02 / 03 • IRAS  11257 + 5850 • Arp  299 • VV  118 • GC  2425 • H  I 247 • h  896 •

Arp 299 is a system of interacting galaxies in the constellation Ursa Major, approximately 143 million light years away . The system consists of a merging pair of galaxies, the nuclei of which are only about 22 ″ apart, and a small E / S0 galaxy (IC 694) about one arc minute to the northwest.

The catalog names NGC 3690 and IC 694 refer to this system, although the assignment is inconsistent. Further confusion was caused by the fact that in Arp's Atlas of Peculiar Galaxies the names NGC 3690 and IC 694 are mistakenly assigned to Arp 296 , another interacting galaxy pair just a few arc minutes away from Arp 299. Halton Arp organized his catalog of unusual galaxies into groups according to purely morphological criteria. This pair of galaxies belongs to the class Unclassified double galaxies .

In the Arp-299 system, the supernovae SN 1992bu, SN 1993G, SN 1998T and SN 1999D as well as SN 1990al and SN 2005U were observed.

False color image of the merging galaxy pair (combination of a VLA image with an HST image)

Web links

Commons : Arp 299  - 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 NGC 3690
  2. ↑ a b c NASA / IPAC EXTRAGALACTIC DATABASE IC 694
  3. ↑ a b c d e f SEDS : NGC 3690
  4. ↑ a b c d e f SEDS : IC 694
  5. ↑ Seligman