NGC 1097

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NGC 1097
Phot-35d-04-fullres.jpg
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.

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