Langbahn Team – Weltmeisterschaft

NGC 2484

NGC 2484
NGC 2484 captured by Sloan Digital Sky Survey
Observation data (J2000 epoch)
ConstellationLynx
Right ascension07h 58m 28.1081s[1]
Declination+37° 47′ 11.808″[1]
Redshift0.04082 0.00001
Heliocentric radial velocity11,770 km/s
Distance558.5 Mly (171.2 Mpc)
Apparent magnitude (V)14.9
Characteristics
TypeS0[1]
Size304,000 ly
Notable featuresRadio galaxy
Other designations
PGC 22350, UGC 4125, 2MASX J07582810+3747121, MCG+06-18-004, 7C 075509.69+375523.00, NVSS J075828+374713, 4C +37.21, 3C 189, NSA 015647, IRCF J075828.1+374711, CALIFA 011, B2 0755+37, LEDA 22350

NGC 2484 is a large lenticular galaxy located in the Lynx constellation.[2] It is situated 560 million light-years away from the Milky Way, which given by its apparent dimensions, means NGC 2484 is around 304,000 light-years across.[1] It is classified a Fanaroff and Riley radio galaxy.[3]

Observation history

NGC 2484 was discovered on 21 January in 1885, by French astronomer Edouard Stephan, who first described the object as "very faint, very small round with a bright middle and mottled, but not resolved."[4]

Characteristics

NGC 2484 has an active galactic nucleus. It also hosts a radio source in its center called 3C 189.[5] According to a study, in which exploring the magnetic environment was done, researchers learnt that the rotation measure was complex, which they gave as evidence for anisotropic fluctuations in two regions.[6] An unusual stripe was shown along its jet axis, which has a low uniform rotation measure (RM) in the approaching lobe and arc-like RM structures, showing sign reversals in receding lobes. They found that the amplitude across its source is inconsistent and believed it is most likely caused by compressed gas around the lobe's leading edges.[6]

Another study shows the x-ray emitting atmospheres of NGC 2484 which indicates it as a low-power radio galaxy.[7] There were multiple x-ray components present and each gas component has a wide range of liner sizes that follow cluster X-ray luminosity and temperature correlations, hinting no relationship of its presence and its gas friction, although the intergalactic medium is enough to confine the outer radio structures.[7]

NGC 2484 is one of the 8 galaxies to be included as part of the 4th Fermi Point Source Catalogue, among them: MRK 421, MRK 501, NGC 315, 3C 264, 3C 274 and FR 0 galaxy, 4C 39.12.[8] Most of them have low redshifts. It also produces extragalactic jets[9] and is the source of gamma-rays.[10]

References

  1. ^ a b c d "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-04-23.
  2. ^ "NGC 2484 - Lenticular Galaxy in Lynx | TheSkyLive.com". theskylive.com. Retrieved 2024-04-23.
  3. ^ Giovannini, G.; Feretti, L.; Venturi, T.; Lara, L.; Marcaide, J.; Rioja, M.; Spangler, S. R.; Wehrle, A. E. (1994-11-01). "VLBI observations of a complete sample of radio galaxies. 4: The radio galaxies NGC 2484, 3C 109, and 3C 382". Astrophysical Journal, Part 1. 435 (1): 116. arXiv:astro-ph/9406037. Bibcode:1994ApJ...435..116G. doi:10.1086/174799. ISSN 0004-637X.
  4. ^ "New General Catalog Objects: NGC 2450 - 2499". cseligman.com. Retrieved 2024-04-23.
  5. ^ Kellermann, K. I.; Pauliny-Toth, I. I. K.; Williams, P. J. S. (1 July 1969). "The Spectra of Radio Sources in the Revised 3c Catalogue". The Astrophysical Journal. 157: 1. Bibcode:1969ApJ...157....1K. doi:10.1086/150046. ISSN 0004-637X.
  6. ^ a b Guidetti, D.; Laing, R. A.; Croston, J. H.; Bridle, A. H.; Parma, P. (21 June 2012). "The magnetized medium around the radio galaxy B2 0755+37: an interaction with the intragroup gas: The magnetized medium around B2 0755+37". Monthly Notices of the Royal Astronomical Society. 423 (2): 1335–1350. arXiv:1203.4582. doi:10.1111/j.1365-2966.2012.20961.x.
  7. ^ a b Worrall, D. M.; Birkinshaw, M. (2000-02-20). "X-ray-emitting Atmospheres of B2 Radio Galaxies". The Astrophysical Journal. 530 (2): 719–732. arXiv:astro-ph/9910141. Bibcode:2000ApJ...530..719W. doi:10.1086/308411. ISSN 0004-637X.
  8. ^ Harvey, Max; Rulten, Cameron B; Chadwick, Paula M (21 July 2020). "A search for γ-ray emission from a sample of local Universe low-frequency selected radio galaxies". Monthly Notices of the Royal Astronomical Society. 496 (1): 903–912. arXiv:2006.02831. doi:10.1093/mnras/staa1593.
  9. ^ "Extragalactic Radio Jets - A.H. Bridle and R.A. Perley". ned.ipac.caltech.edu. Retrieved 2024-04-23.
  10. ^ Chen 陈, Yongyun 永云; Gu 顾, Qiusheng 秋生; Fan 樊, Junhui 军辉; Yu 俞, Xiaoling 效龄; Ding 丁, Nan 楠; Xiong 熊, Dingrong 定荣; Guo 郭, Xiaotong 晓通 (2023-04-01). "General Physical Properties of Gamma-Ray-emitting Radio Galaxies". The Astrophysical Journal Supplement Series. 265 (2): 60. arXiv:2304.05551. Bibcode:2023ApJS..265...60C. doi:10.3847/1538-4365/acc57f. ISSN 0067-0049.
Quelle: https://en.wikipedia.org/wiki/NGC_2484