NGC 4725

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NGC 4725
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NGC 4725 imaged by the Mount Lemmon SkyCenter
Observation data (J2000 epoch)
ConstellationComa Berenices[1]
Right ascensionTemplate:RA[2]
DeclinationTemplate:DEC[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]
Size150,700 ly (46.23 kpc) (estimated)[3]
Apparent size (V)9′.77 × 6′.76[7]
Other designations
Template:Odlist[8]

NGC 4725 is an intermediate barred spiral galaxy with a prominent ring structure,[9] located in the northern constellation of Coma Berenices near the north galactic pole.[10] It was discovered by German-born British astronomer William Herschel on April 6, 1785.[11] The galaxy lies at a distance of approximately 40 megalight-years[4] from the Milky Way. NGC 4725 is the brightest member of the Coma I Group[12] of the Coma-Sculptor Cloud, although it is relatively isolated from the other members of this group.[6] This galaxy is strongly disturbed and is interacting with neighboring spiral galaxy NGC 4747, with its spiral arms showing indications of warping. The pair have 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]

File:NGC 4725.jpg
A 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 discovered by Josef J. Johnson on a photograph taken May 5, 1940, about 2.5′ northeast of the galactic core.[16][17] The light curve indicates this was a Type II supernova.[18]
  • SN 1969H (Type I, mag. 15) was discovered by Anthony Fairall on 8 July 1969.[19][20] [Note: Many sources incorrectly report the discovery date as 17 June 1969.]
  • Candidate SN 1987E was detected April 24, 1987 with a magnitude of 15.65.[21][22] A follow-up studies failed to detect this event, and it is believed to be the result of a high proper motion foreground star.[23][24]
  • SN 1999gs (type unknown, mag. 19.3) was discovered by the Lick Observatory Supernova Search (LOSS) on 28 December 1999.[25] It was positioned 3″ west and 105″ south of the nucleus of NGC 4725.[26]
  • On automated images taken July 5, 2016, a magnitude 17.0 transient source was discovered at an angular separation of 324″ from the galactic nucleus. Designated ASASSN-16gu (AT 2016cyu), with an estimated absolute visual magnitude of –13.6, it was initially thought to be a supernova.[27] However, it was determined that the sighting was actually Kuiper belt object Makemake, a dwarf planet.[28]

References

  1. ^ Page Module:Citation/CS1/styles.css has no content.Sinnott, R. W., ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 978-0-933346-51-2.
  2. ^ a b Template:Cite Gaia DR2
  3. ^ a b c Page Module:Citation/CS1/styles.css has no content."NASA/IPAC Extragalactic Database". Results for NGC 4725. Retrieved 2006-11-25.
  4. ^ a b Page Module:Citation/CS1/styles.css has no content.Jensen, Joseph B.; Tonry, John L.; Barris, Brian J.; Thompson, Rodger I.; et al. (February 2003). "Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations". Astrophysical Journal. 583 (2): 712–726. arXiv:astro-ph/0210129. Bibcode:2003ApJ...583..712J. doi:10.1086/345430. S2CID 551714.
  5. ^ a b c Page Module:Citation/CS1/styles.css has no content.Wevers, B. M. H. R.; et al. (November 1984). "Neutral hydrogen observations of the interacting galaxies NGC 4725 and NGC 4747". Astronomy and Astrophysics. 140: 125–140. Bibcode:1984A&A...140..125W.
  6. ^ a b c Page Module:Citation/CS1/styles.css has no content.Gibson, Brad K.; et al. (February 1999). "The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. XVII. The Cepheid Distance to NGC 4725". The Astrophysical Journal. 512 (1): 48–64. arXiv:astro-ph/9810003. Bibcode:1999ApJ...512...48G. doi:10.1086/306762. S2CID 117635398.
  7. ^ Page Module:Citation/CS1/styles.css has no content.Paturel, G.; et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics. 412: 45–55. Bibcode:2003A&A...412...45P. doi:10.1051/0004-6361:20031411.
  8. ^ Page Module:Citation/CS1/styles.css has no content."NGC 4725". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-10-11. {{cite web}}: Invalid |mode=Script error: No such module "Citation mode". (help)
  9. ^ a b Page Module:Citation/CS1/styles.css has no content.Murphy, E. J.; et al. (July 2018). "A New Detection of Extragalactic Anomalous Microwave Emission in a Compact, Optically Faint Region of NGC 4725". The Astrophysical Journal. 862 (1): 7. arXiv:1805.05965. Bibcode:2018ApJ...862...20M. doi:10.3847/1538-4357/aac5f5. S2CID 56089579. 20.
  10. ^ a b Page Module:Citation/CS1/styles.css has no content.Barber, C. R.; Warwick, R. S. (March 1994). "The spectrum of the extragalactic X-ray background below 3 keV". Monthly Notices of the Royal Astronomical Society. 267 (2): 270–282. Bibcode:1994MNRAS.267..270B. doi:10.1093/mnras/267.2.270.
  11. ^ Page Module:Citation/CS1/styles.css has no content.Seligman, Courtney. "NGC Objects: NGC 4700 - 4749". Retrieved 2020-10-13.
  12. ^ Page Module:Citation/CS1/styles.css has no content.Gregory, S.A.; Thompson, L. A. (1977). "The Coma I Galaxy Cloud". The Astrophysical Journal. 213: 345–350. Bibcode:1977ApJ...213..345G. doi:10.1086/155160. ISSN 0004-637X.
  13. ^ Page Module:Citation/CS1/styles.css has no content.Chiaraluce, E.; et al. (May 2019). "From radio-quiet to radio-silent: low-luminosity Seyfert radio cores". Monthly Notices of the Royal Astronomical Society. 485 (3): 3185–3202. arXiv:1902.10670. Bibcode:2019MNRAS.485.3185C. doi:10.1093/mnras/stz595. S2CID 119089306.
  14. ^ Page Module:Citation/CS1/styles.css has no content.de Lorenzo-Cáceres, A.; Falcón-Barroso, J.; Vazdekis, A.; Martínez-Valpuesta, I. (September 2008). "Stellar Kinematics in Double-Barred Galaxies: The σ-Hollows". The Astrophysical Journal Letters. 684 (2): L83. arXiv:0808.0517. Bibcode:2008ApJ...684L..83D. doi:10.1086/592145. S2CID 17252225.
  15. ^ Page Module:Citation/CS1/styles.css has no content.Buta, R. (March 1988). "The Structure and Dynamics of Ringed Galaxies. V. The Kinematics of NGC 1512, NGC 3351, NGC 4725, and NGC 4736". Astrophysical Journal Supplement. 66: 233. Bibcode:1988ApJS...66..233B. doi:10.1086/191255.
  16. ^ Page Module:Citation/CS1/styles.css has no content.Johnson, J. J. (1940). "A Supernova in NGC 4725". Publications of the Astronomical Society of the Pacific. 52 (307): 206. Bibcode:1940PASP...52..206J. doi:10.1086/125168.
  17. ^ Page Module:Citation/CS1/styles.css has no content.Minkowski, R. (June 1940). "Spectra of the Supernova in NGC 4725". Publications of the Astronomical Society of the Pacific. 52 (307): 206. Bibcode:1940PASP...52..206M. doi:10.1086/125169. S2CID 122418047.
  18. ^ Page Module:Citation/CS1/styles.css has no content.Minkowski, R. (1964). "Supernovae and Supernova Remnants". Annual Review of Astronomy and Astrophysics. 2: 247. Bibcode:1964ARA&A...2..247M. doi:10.1146/annurev.aa.02.090164.001335.
  19. ^ Transient Name Server entry for SN 1969H. Retrieved 25 March 2023.
  20. ^ Page Module:Citation/CS1/styles.css has no content.Schmidt, M.; Fairall, A. P. (11 July 1969). Marsden, Brian G. (ed.). "SUPERNOVA IN NGC 4725". Central Bureau for Astronomical Telegrams. 2155. IAU: 1. Retrieved 27 November 2024.
  21. ^ Page Module:Citation/CS1/styles.css has no content.Rosa, M. (1987). "Supernova 1987E in NGC 4725". International Astronomical Union Circular (4373): 1. Bibcode:1987IAUC.4373....1R.
  22. ^ Page Module:Citation/CS1/styles.css has no content.Rosa, M.; Koishikawa, M. (April 1987). Green, D. W. E. (ed.). "Supernova 1987E in NGC 4725". IAU Circular. 4374 (2): 2. Bibcode:1987IAUC.4374....2R.
  23. ^ Page Module:Citation/CS1/styles.css has no content.Wild, P. (1987). "Supernova 1987E in NGC 4725?". International Astronomical Union Circular (4382): 1. Bibcode:1987IAUC.4382....1W.
  24. ^ Page Module:Citation/CS1/styles.css has no content.Filippenko, A. V. (May 1987). Green, D. W. E. (ed.). "No Supernova in NGC 4725". IAU Circular. 4385 (2): 2. Bibcode:1987IAUC.4385....2F.
  25. ^ Page Module:Citation/CS1/styles.css has no content."SN 1999gs". Transient Name Server. IAU. Retrieved 27 November 2024.
  26. ^ Page Module:Citation/CS1/styles.css has no content.Li, W. D. (January 2000). Green, D. W. E. (ed.). "Supernova 1999gs in NGC 4725". IAU Circular. 7345 (2): 2. Bibcode:2000IAUC.7345....2L.
  27. ^ Page Module:Citation/CS1/styles.css has no content.Brimacombe, J.; et al. (July 2016). "ASASSN-16gu: Discovery of A Probable Supernova in NGC 4725". The Astronomer's Telegram. 9211: 1. Bibcode:2016ATel.9211....1B.
  28. ^ Page Module:Citation/CS1/styles.css has no content.Dong, Subo; ASAS-SN Team (2016). "ASASSN-16gu = dwarf planet Makemake (136472)". The Astronomer's Telegram. 9214: 1. Bibcode:2016ATel.9214....1D.

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