Quasar in the constellation Ursa Major
3C 254 is a radio-loudquasar [ 1] constellation ofUrsa Major . The object has aredshift of (z) 0.734 and is classified as aFanaroff-Riley class type II source.[ 2] astronomers as anastronomical radio source in 1965.[ 3]
3C 254 contains an asymmetrical radio structure consisting of two radio lobes and a central component.[ 4] [ 5] radio spectrum is found straight and steep.[ 6] MERLIN (Multi-Element Radio-linked Interferometer Network) at 1539MHz , the western lobe is made up of two hotspots, a compact primary hotspot and a more diffused secondary hotspot with an approximate peakbrightness of 36mJy . In addition, the western lobe is found to be significantlypolarized compared to the eastern lobe, whoseemission is less compact and stretching in a south-east direction.[ 5] [ 7] [ 8]
The host galaxy of 3C 354 according to imaging byHubble Space Telescope (HST), has a complex morphology. It is orientated in an east-west direction, showing traces of emission plumes along theposition angles of 285° and 45°.[ 9] galaxy cluster .[ 10]
Anextended emission-line region has been discovered around 3C 254. Based on observations, the region is extended by 80kiloparsecs (kpc).[ 11] [ 12] kinematics and intensity in itsemission lines , hinting thejet is interacting with agas cloud .[ 12] X-ray emission source was discovered although an optical counterpart wasn't found.[ 13]
^ Megn, A. V.; Braude, S. Ya.; Rashkovskij, S. L.; Sharykin, N. K.; Shepelev, V. A.; Inyutin, G. A.; Khristenko, A. D.; Brazhenko, A. I.; Bulatsen, V. G. (1 January 1996)."Interferometer observations of the quasar 3C 254 in the decameter wavelengths range" .Kinematika I Fizika Nebesnykh Tel .12 (6):3– 12.Bibcode :1996KFNT...12f...3M .ISSN 0233-7665 . ^ Donahue, Megan; Daly, Ruth A.; Horner, Donald J. (20 February 2003)."Constraints on the Cluster Environments and Hot Spot Magnetic Field Strengths of the Radio Sources 3C 280 and 3C 254" .The Astrophysical Journal .584 (2):643– 656.arXiv :astro-ph/0211145 Bibcode :2003ApJ...584..643D .doi :10.1086/345831 .ISSN 0004-637X . ^ Schmidt, Maarten (April 1965)."Large Redshifts of Five Quasi-Stellar Sources" .The Astrophysical Journal .141 : 1295.Bibcode :1965ApJ...141.1295S .doi :10.1086/148217 .ISSN 0004-637X . ^ Davis, R. J.; Stannard, D.; Conway, R. G. (1 December 1983)."Interferometric observations of compact components in extragalactic radio sources - II" .Monthly Notices of the Royal Astronomical Society .205 (4):1267– 1278.Bibcode :1983MNRAS.205.1267D .doi :10.1093/mnras/205.4.1267 ISSN 0035-8711 . ^a b Thomasson, P.; Saikia, D. J.; Muxlow, T. W. B. (11 November 2006)."3C 254: MERLIN observations of a highly asymmetric quasar" .Monthly Notices of the Royal Astronomical Society .372 (4):1607– 1613.arXiv :astro-ph/0608481 Bibcode :2006MNRAS.372.1607T .doi :10.1111/j.1365-2966.2006.10955.x ISSN 0035-8711 . ^ Hooimeyer, J. R. A.; Barthel, P. D.; Schilizzi, R. T.; Miley, G. K. (1 July 1992)."The radio structure of extended quasars. I. A VLBI survey of the nuclear emission" .Astronomy and Astrophysics .261 :18– 24.Bibcode :1992A&A...261...18H .ISSN 0004-6361 . ^ Schilizzi, R. T.; Kapahi, V. K.; Neff, S. G. (1 June 1982)."VLA Observations of Hot Spots in High Luminosity Radio Sources" .Journal of Astrophysics and Astronomy .3 (2):173– 187.Bibcode :1982JApA....3..173S .doi :10.1007/BF02714801 .ISSN 0250-6335 . ^ Liu, R.; Pooley, G.; Riley, J. M. (15 August 1992)."Spectral ageing in a sample of 14 high-luminosity double radio sources" .Monthly Notices of the Royal Astronomical Society .257 (4):545– 571.Bibcode :1992MNRAS.257..545L .doi :10.1093/mnras/257.4.545 ISSN 0035-8711 . ^ Lehnert, Matthew D.; Miley, George K.; Sparks, William B.; Baum, Stefi A.; Biretta, John; Golombek, Daniel; de Koff, Sigrid; Macchetto, Ferdinando D.; McCarthy, Patrick J. (August 1999)."HUBBLE SPACE TELESCOPE Snapshot Survey of 3CR Quasars: The Data" The Astrophysical Journal Supplement Series .123 (2):351– 376.Bibcode :1999ApJS..123..351L .doi :10.1086/313239 .ISSN 0067-0049 . ^ Bremer, M. N. (1 January 1997)."3C 254: the alignment effect and unification schemes" .Monthly Notices of the Royal Astronomical Society .284 :126– 136.doi :10.1093/mnras/284.1.126 hdl :1887/6700 ISSN 0035-8711 . ^ Forbes, D. A.; Crawford, C. S.; Fabian, A. C.; Johnstone, R. M. (1 June 1990)."Extended emission-line gas around the quasars 3C 254 and 3C 309.1 . Very massive cooling flows" .Monthly Notices of the Royal Astronomical Society .244 : 680.Bibcode :1990MNRAS.244..680F .ISSN 0035-8711 . ^a b Crawford, C. S.; Vanderriest, C. (1 March 1997)."Integral field spectroscopy of a jet-cloud interaction in the quasar 3C254" .Monthly Notices of the Royal Astronomical Society .285 (3):580– 592.Bibcode :1997MNRAS.285..580C .doi :10.1093/mnras/285.3.580 ISSN 0035-8711 . ^ Crawford, C. S.; Lehmann, I.; Fabian, A. C.; Bremer, M. N.; Hasinger, G. (1 October 1999)."Detection of X-ray emission from the host clusters of 3CR quasars" .Monthly Notices of the Royal Astronomical Society .308 (4):1159– 1172.arXiv :astro-ph/9904371 Bibcode :1999MNRAS.308.1159C .doi :10.1046/j.1365-8711.1999.02804.x ISSN 0035-8711 .
