Arp 299
Galaxy Arp 299 |
|
---|---|
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.
Web links
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