3C 343

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3C 343
SDSS image of 3C 343.
Observation data (J2000.0 epoch)
ConstellationDraco
Right ascension16h 34m 33.80s[1]
Declination+62° 45′ 35.89″[1]
Redshift0.988000[1]
Heliocentric radial velocity296,195 km/s[1]
Distance7.880 Gly
Apparent magnitude (B)21.06
Characteristics
TypeHEG, CSS[1]
Other designations
4C +62.26, LEDA 2817689, NVSS J163433+624535, 6C B163400.8+625137, DA 416, NRAO 0509, CoNFIG 255[1]

3C 343 is a quasar[2] located in the constellation of Draco. The redshift of the object is (z) 0.988[1] and it was first recorded in the Third Cambridge Catalogue of Radio Sources survey in 1962.[3] It is a Seyfert type 2 galaxy[4] and such contains a compact steep spectrum source that is classified as double.[5][6][7]

Description

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3C 343 is classified as a young radio-loud active galaxy with a radio power of 27.7 GHz.[8] It contains a compact source described as a single component that is around 200 milliseconds in diameter.[5] Polarimetric observations made with the Very Long Baseline Array (VLBA) reveal two components that are surrounded by weak radio emission. Both of these components are shown to have a steep radio spectrum between the frequencies of 4.8 and 8.4 GHz.[9]

Observations with European Very Long Baseline Interferometry (VLBI) at 18 centimeters showed the source has several emission ridges distributed across multiple position angles, while newer VLBI observations described the source as elongated from north to west.[10][11] A complex structure is found inside a core component by VLBI.[12] There is a radio jet present in 3C 343, having a knotty appearance and deflated through collisions with interstellar medium.[6] This jet is estimated to have a linear size of 1.45 kiloparsecs.[8]

A new component was discovered in 3C 343 via an 8.4 GHz radio image. This component is found in an eastern direction from the first component and has an estimated flux density of 7.7 mJy. It is noted to have a radio spectrum that is inverted, making it possible this is the radio core. Further evidence also revealed the component is situated on the jet's curved trajectory path. Polarization is found in 3C 343, with the percentage of it being around 0.96%.[9] It is noted to be variable, increasing rapidly though wavelength observations.[13] A supermassive black hole mass of 7.5 Mʘ has been found for the quasar.[14]

References

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  1. ^ a b c d e f g "NED Search results for 3C 343". NASA/IPAC Extragalactic Database. Retrieved 2025-09-28.
  2. ^ Spencer, R.E.; McDowell, J.C.; Charlesworth, M.; Fanti, C.; Parma, P.; Peacock, J.A. (October 1989). "MERLIN and VLA observations of compact steep-spectrum radio sources". Monthly Notices of the Royal Astronomical Society. 240 (3): 657–687. doi:10.1093/mnras/240.3.657. ISSN 0035-8711. Archived from the original on 2024-06-26.
  3. ^ S., Bennett, A. (1962). "The revised 3C catalogue of radio sources". Memoirs of the Royal Astronomical Society. 68: 163. Bibcode:1962MmRAS..68..163B. Archived from the original on 2024-04-13.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ Aldcroft, Thomas L.; Bechtold, Jill; Elvis, Martin (July 1994). "MG II absorption in a sample of 56 steep-spectrum quasars". The Astrophysical Journal Supplement Series. 93: 1. Bibcode:1994ApJS...93....1A. doi:10.1086/192044. ISSN 0067-0049. Archived from the original on 2024-07-06.
  5. ^ a b Pearson, T. J.; Readhead, A. C. S. (May 1988). "The milliarcsecond structure of a complete sample of radio sources. II - First-epoch maps at 5 GHz". The Astrophysical Journal. 328: 114. Bibcode:1988ApJ...328..114P. doi:10.1086/166274. ISSN 0004-637X. Archived from the original on 2022-11-07.
  6. ^ a b N., Ren-Dong; T., Schilizzi, R.; C., Fanti; R., Fanti; van Breugel, W. J. M.; W., Muxlow, T. (1988). "The radio structure of the compact steep spectrum sources 3C 119, 3C 287 and 3C 343". The Impact of VLBI on Astrophysics and Geophysics. 129. ISSN 1743-9221. Archived from the original on 2024-11-10.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  7. ^ Moffet, AT (1965). "3C 343, a Double Radio Source with Very Wide Component Separation". American Astronomical Society.
  8. ^ a b Kawakatu, Nozomu; Nagao, Tohru; Woo, Jong-Hak (2009-03-10). "Exploring the Disk-Jet Connection From the Properties of Narrow-Line Regions in Powerful Young Radio-Loud Active Galactic Nuceli". The Astrophysical Journal. 693 (2): 1686–1695. arXiv:0812.1329. Bibcode:2009ApJ...693.1686K. doi:10.1088/0004-637X/693/2/1686. ISSN 0004-637X.
  9. ^ a b Mantovani, F.; Rossetti, A.; Junor, W.; Saikia, D. J.; Salter, C. J. (2010-07-01). "Radio polarimetry of 3C 119, 3C 318, and 3C 343 at milliarcsecond resolution". Astronomy & Astrophysics. 518: A33. arXiv:1005.2950. Bibcode:2010A&A...518A..33M. doi:10.1051/0004-6361/201014400. ISSN 0004-6361.
  10. ^ C., Fanti; R., Fanti; P., Parma; T., Schilizzi, R.; van Breugel, W. J. M. (February 1985). "Compact steep spectrum 3 CR radio sources. VLBI observations at 18 cm". Astronomy and Astrophysics. 143: 292. Bibcode:1985A&A...143..292F. ISSN 0004-6361. Archived from the original on 2024-03-27.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  11. ^ Dallacasa, D; Orienti, M; Fanti, C; Fanti, R (2021-04-13). "VLBI images at 327 MHz of compact steep spectrum and GHz-peaked spectrum sources from the 3C and PW samples". Monthly Notices of the Royal Astronomical Society. 504 (2): 2312–2324. doi:10.1093/mnras/stab1014. ISSN 0035-8711.
  12. ^ Pearson, T. J.; Readhead, A. C. S.; Perley, R. A. (May 1985). "Compact radio sources in the 3C catalog". The Astronomical Journal. 90: 738. Bibcode:1985AJ.....90..738P. doi:10.1086/113782. ISSN 0004-6256. Archived from the original on 2024-06-09.
  13. ^ van Breugel, W.; Miley, G.; Heckman, T. (January 1984). "Studies of kiloparsec-scale, steep-spectrum radio cores. I VLA maps". The Astronomical Journal. 89: 5. Bibcode:1984AJ.....89....5V. doi:10.1086/113480. ISSN 0004-6256. Archived from the original on 2024-06-09.
  14. ^ Wu, Qingwen (2009-05-22), "The black hole mass, Eddington ratio and M BH-σ[O III]relation in young radio galaxies", Monthly Notices of the Royal Astronomical Society, 398 (4): 1905–1914, arXiv:0905.3663, Bibcode:2009MNRAS.398.1905W, doi:10.1111/j.1365-2966.2009.15127.x
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