NGC 4698

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NGC 4698
N4698s.jpg
NGC 4698 imaged with the 32-inch Schulman Telescope at Mount Lemmon Observatory
Observation data (J2000 epoch)
Constellation Virgo
Right ascension 12h 34m 20.310s [1]
Declination +08° 11′ 51.94″ [1]
Heliocentric radial velocity 1,002 [2] km/s
Distance 54.8 Mly (16.8 Mpc) [3]
Group or cluster Virgo Cluster
Apparent magnitude  (V)10.6 [4]
Apparent magnitude  (B)11.46 [5]
Characteristics
Type SA(s)ab [3]
Apparent size  (V)4′.0 × 2′.9 [4]
Notable featuresSeyfert-2 galaxy [6]
Other designations
PGC 43254, UGC 7970, VCC 2070

NGC 4698 is a barred spiral galaxy [5] located around 55 [3] million light years away from Earth in the constellation of Virgo. It belongs to the Virgo Cluster of galaxies and is positioned near the northeastern edge of this assemblage. [4] The morphological classification of NGC 4698 in the De Vaucouleurs system is SA(s)ab, [3] which indicates a purely spiral structure with moderate to tightly wound arms. [7] It is inclined to the line of sight from the Earth by an angle of 53° along a position angle of 170°. [8]

Contents

A unique feature of this galaxy is that the stars and dust of the nuclear disk are rotating in a direction that is aligned perpendicularly to the galactic disk. The bulge likewise appears elongated out of the galactic plane. This unusual alignment may have been the result of a past merger event. [5]

NGC 4698 is classified as a Seyfert-2 galaxy with an active galactic nucleus, which displays a prominent emission of radio and X-ray energy from the core while showing narrow emission lines in the optical spectrum. [6] The unified model of Seyfert galaxies proposes that the nucleus of a Seyfert 2 galaxy is obscured by a thick torus of gas and dust. However, the varying X-ray emission of the core of NGC 4698 shows little indication of being obstructed, suggesting instead that the source of the energy emission is generally unobscured but anemic in nature. [9]

References

  1. 1 2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi: 10.1086/498708 . ISSN   0004-6256. S2CID   18913331.
  2. ↑ Crook, Aidan C.; et al. (February 2007), "Groups of Galaxies in the Two Micron All Sky Redshift Survey", The Astrophysical Journal, 655 (2): 790–813, arXiv: astro-ph/0610732 , Bibcode:2007ApJ...655..790C, doi:10.1086/510201, S2CID   11672751.
  3. 1 2 3 4 de Looze, Ilse; et al. (October 2011), "The reliability of [C II] as an indicator of the star formation rate", Monthly Notices of the Royal Astronomical Society, 416 (4): 2712–2724, arXiv: 1106.1643 , Bibcode:2011MNRAS.416.2712D, doi: 10.1111/j.1365-2966.2011.19223.x .
  4. 1 2 3 Finlay, W. H. (2003), Concise Catalog of Deep-sky Objects: Astrophysical Information for 500 Galaxies, Clusters and Nebulae, Springer, p. 175, ISBN   978-1852336912.
  5. 1 2 3 Corsini, E. M.; et al. (June 2012), "Polar bulges and polar nuclear discs: the case of NGC 4698", Monthly Notices of the Royal Astronomical Society: Letters , 423 (1): L79 –L83, arXiv: 1204.2265 , Bibcode:2012MNRAS.423L..79C, doi: 10.1111/j.1745-3933.2012.01261.x , S2CID   119099390.
  6. 1 2 Georgantopoulos, I.; et al. (September 2003), "Chandra Observations of NGC 4698: A Seyfert 2 Galaxy with No Absorption", The Astrophysical Journal, 594 (2): 704–708, arXiv: astro-ph/0305488 , Bibcode:2003ApJ...594..704G, doi:10.1086/377120, S2CID   13982986.
  7. ↑ Buta, Ronald J.; et al. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN   978-0521820486.
  8. ↑ Giovanardi, C.; et al. (March 1996), "Near-Infrared Low-Resolution Mapping of Early-Type Spirals", Astronomical Journal, 111 (2): 1086–1097, Bibcode:1996AJ....111.1086G, doi:10.1086/117854.
  9. ↑ Tran, Hien D.; et al. (January 2011), "Indecent Exposure in Seyfert 2 Galaxies: A Close Look", The Astrophysical Journal Letters, 726 (2): L21, arXiv: 1012.1865 , Bibcode:2011ApJ...726L..21T, doi:10.1088/2041-8205/726/2/L21, S2CID   119190993.


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