NGC 4725

Source: Wikipedia, the free encyclopedia.
NGC 4725
J2000 epoch)
ConstellationComa Berenices[1]
Right ascension12h 50m 26.56929s[2]
Declination+25° 30′ 02.7376″[2]
Heliocentric radial velocity1,206±3 km/s[3]
Distance40.1 ± 6.2 Mly (12.3 ± 1.9 Mpc)[4]
Apparent magnitude (V)10.1[3]
Characteristics
TypeSAB(r)ab pec[5] or Sb/SB(r)II[6]
Apparent size (V)9′.77 × 6′.76[7]
Other designations
IRAS 12480+2547, NGC 4725, UGC 7989, LEDA 43451, PGC 43451[7][8]

NGC 4725 is an

angular separation of 24′, which corresponds to a projected linear separation of 370 kly.[5] A tidal plume extends from NGC 4747 toward NGC 4725.[10]

mid-infrared image of NGC 4725 taken by the Spitzer Space Telescope
(SST)

NGC 4725 is a suspected type 2 Seyfert galaxy with a supermassive black hole at the core.[13] The morphological classification of this galaxy is SAB(r)ab pec,[5] indicating a peculiar, weakly-barred spiral galaxy (SAB) with a complete ring surrounding the bar (r) and somewhat tightly-wound spiral arms (ab). It is actually double-barred, a feature found among about a third of all barred spirals.[14] The galactic plane is inclined by approximately 46° to the line of sight from the Earth.[6]

The ring structure of the galaxy is a region of star formation. It is offset from the galactic center and displays non-circular motion.[15] There is a compact radio source positioned approximately 6.2 kly from the nucleus of NGC 4725. Since there is no optical counterpart at that position, this may be a star forming region that is heavily obscured by dust.[9]

Supernovae

Multiple supernova candidate events have been detected in this galaxy:

  • SN 1940B was detected on a photograph taken May 5, 1940, about 2.5′ northeast of the galactic core.[16] The light curve indicates this was a type II supernova.[17]
  • SN 1969H was discovered on 17 June 1969, with a magnitude of 15.[18]
  • Candidate
    gravitational lensing.[20]
  • SN 1999gs was detected on December 28, 1999 with a magnitude of 19.3. It was positioned 3″ west and 105″ south of the nucleus of NGC 4725.[21]
  • On automated images taken July 5, 2016, a magnitude 17.0 transient source was discovered at an angular separation of 324
    absolute visual magnitude of –13.6.[22]

References

  1. ISBN 978-0-933346-51-2
    .
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 4725. Retrieved 2006-11-25.
  4. ^
    S2CID 551714
    .
  5. ^
    Bibcode:1984A&A...140..125W
    .
  6. ^
    S2CID 117635398
    .
  7. ^
    doi:10.1051/0004-6361:20031411
    .
  8. ^ "NGC 4725". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-11.
  9. ^
    S2CID 56089579
    . 20.
  10. ^
    doi:10.1093/mnras/267.2.270
    .
  11. ^ Seligman, Courtney. "NGC Objects: NGC 4700 - 4749". Retrieved 2020-10-13.
  12. ISSN 0004-637X
    .
  13. S2CID 119089306
    .
  14. S2CID 17252225
    .
  15. doi:10.1086/191255
    .
  16. S2CID 122418047
    .
  17. doi:10.1146/annurev.aa.02.090164.001335
    .
  18. ^ Transient Name Server entry for SN 1969H. Retrieved 25 March 2023.
  19. Bibcode:1987IAUC.4374....2R
    .
  20. Bibcode:1987IAUC.4385....2F
    .
  21. Bibcode:2000IAUC.7345....2L
    .
  22. Bibcode:2016ATel.9211....1B
    .

External links

Wikimedia Commons has media related to NGC 4725.
Retrieved from "https://en.wikipedia.org/w/index.php?title=NGC_4725&oldid=1218302893"