NGC 985

Source: Wikipedia, the free encyclopedia.
567 Mly (174 Mpc)[1]
Apparent magnitude (V)13.5
Characteristics
TypeRing pec [1]
Apparent size (V)1.0′ × 0.9′[1]
Notable featuresSeyfert galaxy
Other designations
VV 285, Mrk 1048, MCG -02-07-035, PGC 9817[1]

NGC 985 is a

Francis Leavenworth in 1886.[2] It is a type 1 Seyfert galaxy.[3]

NGC 985 is characterised by its ring shape. It is believed it was formed as a result of a

infrared light, a second nucleus was found 3.8 arcseconds northwest of the active nucleus. It is much redder than the rest of the galaxy, indicating the presence of old stars. It has been suggested that the collision between a disk galaxy with another galaxy caused the formation of the ring and displaced the nucleus of the galaxy, creating an empty ring. Based on the kinematics of the galaxy, the secondary nucleus belonged to the intruder galaxy, while the active nucleus is associated with the main stellar component.[5][6]

As is common with merger remnants, NGC 985 has increased star formation rate, and as a result shines bright in the infrared. The total infrared luminosity of NGC 985 is 1.8×1011 L☉ and it is characterised as a luminous infrared galaxy. The total molecular gas mass of the galaxy is estimated to be 2×1010 M☉. Very large molecular clouds exist near the nuclei. They may be clouds gathering around the nucleus in the process of forming a disk around the two nuclei or molecular clouds disrupted by an outflow from the nucleus of the galaxy.[7]

NGC 985 is a powerful X-ray source, detected by ROSAT. It is a complex X-ray source, whose spectrum cannot be accounted for by a simple power law at 0.6 keV and suggests the presence of a warm absorber.[8] The hard X-ray emission on the other hand is characterised by a simple power law.[9] The X-ray flux, especially soft X-rays, diminished in NGC 985 in 2013. The variability of the X-ray and ultraviolet emission from the nucleus was observed using the XMM-Newton and Hubble Space Telescope respectively. These observations revealed the presence of outflowing wind from an accretion disk formed around a supermassive black hole that obstructed the nucleus in soft X-rays and UV. The nucleus is otherwise seen unobstructed.[10]

References

  1. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 985. Retrieved 2017-04-18.
  2. ^ Seligman, Courtney. "NGC 985 (= PGC 9817)". Celestial Atlas. Retrieved 19 November 2018.
  3. S2CID 119264651
    .
  4. doi:10.1086/173293
    .
  5. doi:10.1086/118147
    .
  6. doi:10.1086/306706
    .
  7. doi:10.1086/338227
    .
  8. S2CID 119066001
    .
  9. ISSN 0004-6361
    .
  10. S2CID 119229536
    .

External links

Wikimedia Commons has media related to NGC 985.


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