NGC 5252 explained

NGC 5252
Epoch:J2000
Type:S0 [1]
Dist Ly:221 Mly (67.9 Mpc)
320 Mly (98.4 Mpc)[2]
Z:0.023093 ± 0.000005
H Radial V:6,923 ± 1 km/s
Appmag V:13.8
Size V:1.4 × 0.8
Constellation Name:Virgo
Notes:Seyfert galaxy
Names:UGC 8622, MCG +01-35-022, PGC 48189

NGC 5252 is a lenticular galaxy located in the constellation Virgo. It is located at a distance of about 220 to 320 million light years from Earth, which, given its apparent dimensions, means that NGC 5252 is about 100,000 light years across. It was discovered by William Herschel on February 2, 1786.[3]

Characteristics

Nucleus

The nucleus of NGC 5252 has been found to be active and it has been categorised as a type II Seyfert galaxy[4] or type 1.9.[5] A broad H-alpha line has been observed, indicating that a broad line region is partially hidden and the nucleus of NGC 5252 is more active than originally thought.[6]

The most accepted theory for the energy source of active galactic nuclei is the presence of an accretion disk around a supermassive black hole. The mass of the black hole in the centre of NGC 5252 is estimated to be based on the dynamics of the circumnuclear gas.[7] The mass of the black hole is larger than that observed in Seyfert galaxies and it is more in line with a radio-quiet quasar, with a black hole which is accreting at a slow rate.[7] The X-ray observations of the galaxy indicate a flat spectrum with a soft X-rays element due to ionised gas cones, which also indicate that the galaxy hosts a quasar relic.[8]

The nucleus is surrounded by filamentary structures which glow green due to the ionised oxygen. These were illuminated when the nucleus of the galaxy hosted a quasar.[9]

Ultraluminous X-ray source

An ultraluminous X-ray source has been observed 22 arcseconds from the nucleus of the galaxy, which corresponds to about 10 kiloparsec at the distance of the galaxy. Its luminosity is estimated to be erg s−1.[2] The source has also been observed in visual light and radiowaves. In radiowaves it features two components, one east and one west.[10] The redshift of the source is similar to that of the galaxy, indicating that it is gravitationally bound to the galaxy.[2] It probably is an intermediate-mass black hole with a mass over solar masses, probably the remnant of a nucleus of dwarf galaxy[2] [11] with low-luminosity activity, as the black hole is probably accreting weakly.[12]

See also

External links

Notes and References

  1. Web site: NASA/IPAC Extragalactic Database . Results for NGC 5252 . 2023-05-06 .
  2. Kim . Minjin . Ho . Luis C. . Wang . Junfeng . Fabbiano . Giuseppina . Bianchi . Stefano . Cappi . Massimo . Dadina . Mauro . Malaguti . Giuseppe . Wang . Chen . An Off-Nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252 . The Astrophysical Journal . 10 November 2015 . 814 . 1 . 8 . 10.1088/0004-637X/814/1/8. 1510.08854 . 2015ApJ...814....8K . 119121191 .
  3. Web site: Seligman . Courtney . NGC 5252 . Celestial Atlas . 19 November 2018.
  4. Veron-Cetty . M. -P. . Veron . P. . Miscellaneous observations of active galactic nuclei. . Astronomy and Astrophysics Supplement Series . 1 August 1986 . 65 . 241–258 . 1986A&AS...65..241V . 0365-0138.
  5. Osterbrock . Donald E. . Martel . Andre . Spectroscopic Study of the CfA Sample of Seyfert Galaxies . The Astrophysical Journal . 1 September 1993 . 414 . 552 . 10.1086/173102 . 1993ApJ...414..552O . 0004-637X.
  6. Acosta-Pulido . Jose A. . Vila-Vilaro . Baltasar . Perez-Fournon . Ismael . Wilson . Andrew S. . Tsvetanov . Zlatan I. . Toward an Understanding of the Seyfert Galaxy NGC 5252: A Spectroscopic Study . The Astrophysical Journal . June 1996 . 464 . 177 . 10.1086/177310. 1996ApJ...464..177A .
  7. Capetti . A. . Marconi . A. . Macchetto . D. . Axon . D. . The supermassive black hole in the Seyfert 2 galaxy NGC 5252 . Astronomy & Astrophysics . February 2005 . 431 . 2 . 465–475 . 10.1051/0004-6361:20041701. astro-ph/0411081 . 2005A&A...431..465C . free .
  8. Dadina . M. . Guainazzi . M. . Cappi . M. . Bianchi . S. . Vignali . C. . Malaguti . G. . Comastri . A. . X-ray imaging of the ionisation cones in NGC 5252 . Astronomy and Astrophysics . June 2010 . 516 . A9 . 10.1051/0004-6361/200913727. 1003.1665 . 2010A&A...516A...9D . 54615901 .
  9. Web site: Hubble view of green filament in galaxy NGC 5252 . www.spacetelescope.org . 2 April 2015 . 28 May 2023 . en.
  10. Mezcua . M. Mar Mezcua . Kim . M . Ho . L C . Lonsdale . C J . The extended radio jet of an off-nuclear low-mass AGN in NGC 5252 . Monthly Notices of the Royal Astronomical Society: Letters . 19 July 2018 . 480. L74–L78. 10.1093/mnrasl/sly130. free. 1807.03792 .
  11. Kim . Minjin . Ho . Luis C. . Im . Myungshin . Ionized Gas Kinematics around an Ultra-luminous X-Ray Source in NGC 5252: Additional Evidence for an Off-nuclear AGN . The Astrophysical Journal . 27 July 2017 . 844 . 2 . L21 . 10.3847/2041-8213/aa7fe8. 1707.05402 . 2017ApJ...844L..21K . free .
  12. Yang . Xiaolong . Yang . Jun . Paragi . Zsolt . Liu . Xiang . An . Tao . Bianchi . Stefano . Ho . Luis C. . Cui . Lang . Zhao . Wei . Wu . Xiaocong . NGC 5252: a pair of radio-emitting active galactic nuclei? . Monthly Notices of the Royal Astronomical Society: Letters . 1 January 2017 . 464 . 1 . L70–L74 . 10.1093/mnrasl/slw160. free . 1608.02200 .

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