NGC 1097

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NGC 1097
Observation data (J2000 epoch)
Constellation Fornax
Right ascension 02h 46m 19.0s[1]
Declination −30° 16′ 30″[1]
Redshift 1271 ± 3 km/s[1]
Distance 45 million ly [2]
Type (R'_1:)SB(r'l)bSy1[1]
Apparent dimensions (V) 9′.3 × 6′.3[1]
Apparent magnitude (V) 10.2[1]
Other designations
ESO 416- G 20, PGC 10488,[1] Arp 77[1] Caldwell 67
See also: Galaxy, List of galaxies

NGC 1097 is a barred spiral galaxy about 45 million light-years away in the constellation Fornax. It was discovered by William Herschel on 9 October 1790. Three supernovae (SN 1992bd, SN 1999eu, and SN 2003B) have been observed in NGC 1097.

NGC 1097 is also a Seyfert galaxy. Deep photographs revealed four narrow optical jets that appear to emanate from the nucleus. These have been interpreted as manifestations of the (currently weak) active nucleus. Subsequent analysis of the brightest jet's radio-to-X-ray spectral energy distribution were able to rule out synchrotron and thermal free-free emission. The optical jets are in fact composed of stars. The failure to detect atomic hydrogen gas in the jets (under the assumption that they were an example of tidal tails) using deep 21 cm HI imaging with the Very Large Array radio telescope and numerical simulations led to the current interpretation that the jets are actually the shattered remains of a cannibalized dwarf galaxy.

Like most massive galaxies, NGC 1097 has a supermassive black hole at its center. Around the central black hole is a ring of star-forming regions with a network of gas and dust that spirals from the ring to the black hole.

NGC 1097 has two satellite galaxies. Dwarf elliptical galaxy NGC 1097A is the larger of the two. It is a peculiar elliptical galaxy that orbits 42,000 light-years from the center of NGC 1097. Dwarf galaxy NGC 1097B (5 x 106 solar masses), the outermost one, was discovered by its HI emission, and appears to be a typical dwarf irregular. Little else is known about it.

Gallery

  • Star forming ring in NGC 1097. HST. 0.9′ view

  • Colour-composite image of the central 5,500 light-years wide region of the spiral galaxy NGC 1097, obtained with the NACO adaptive optics on the VLT. Credit: ESO

  • NGC 1097 seen by the Spitzer Space Telescope

See also

  • Spiral Galaxy NGC 1300
  • Spiral Galaxy NGC 1232

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NASA/IPAC Extragalactic Database". Results for NGC 1097. Retrieved 2006-11-25. 
  2. ↑ "Feeding the Monster: New VLT Images Reveal the Surroundings of a Super-massive Black Hole". European Southern Observatory. Retrieved 2008-03-15. 

External links

 
NGC
  • NGC 1092
  • NGC 1093
  • NGC 1094
  • NGC 1095
  • NGC 1096
  • NGC 1097
  • NGC 1098
  • NGC 1099
  • NGC 1100
  • NGC 1101
  • NGC 1102
PGC
  • PGC 10484
  • PGC 10485
  • PGC 10486
  • PGC 10487
  • PGC 10488
  • PGC 10489
  • PGC 10490
  • PGC 10491
  • PGC 10492
Caldwell
  • C58
  • C59
  • C60
  • C61
  • C62
  • C63
  • C64
  • C65
  • C66
  • C67
  • C68
  • C69
  • C70
  • C71
  • C72
  • C73
  • C74
  • C75
  • C76
Arp
  • Arp 71
  • Arp 72
  • Arp 73
  • Arp 74
  • Arp 75
  • Arp 76
  • Arp 77
  • Arp 78
  • Arp 79
  • Arp 80
  • Arp 81
  • Arp 82
  • Arp 83

Coordinates: 02h 46m 19.0s, −30° 16′ 30″

List
See also
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