3C 343.1

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3C 343.1
SDSS image of 3C 343.1
Observation data (J2000.0 epoch)
ConstellationDraco
Right ascension16h 38m 28.22s[1]
Declination+62° 34′ 44.31″[1]
Redshift0.752380[1]
Heliocentric radial velocity225,558 km/s[1]
Distance6.777 Gly
Apparent magnitude (V)20.7
Characteristics
TypeNLRG Sy2[1]
Other designations
LEDA 2821600, 4C +62.27, NVSS J163828+623443, 87GB 163755.4+624035, 7C 1637+6240, 8C 1637+626, DA 419, NRAO 0511, CoNFIG 258, VIPS 1002, ICRF J163828.2+623444[1]

3C 343.1 is a radio galaxy located in the constellation of Draco. The redshift of the object is (z) 0.752[1] and it was first recorded in the Third Cambridge Catalogue of Radio Sources survey in 1966.[2] It is also a quasar, pairing up with a foreground galaxy located at (z) 0.344,[3] and is classified as a compact steep spectrum source (CSS).[4][5]

Description

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The host galaxy of 3C 343.1 has a blue appearance mainly due to the presence of an early-type stellar population or a recent wave of star formation.[6] The total star formation rate of the galaxy is estimated to be 1.7+0.5-0.4 x 1011 Mʘ, with the host infrared luminosity estimated to be 2.9+0.6-0.5 x 1011 Lʘ. It has a supermassive black hole mass of 28.7 x 107 Mʘ.[7] The nucleus of the galaxy has been categorized as compact.[8]

3C 343.1 has a compact source. When observed with the Very Large Array (VLA), the source has an elongated appearance in the position angle of 110°, with two clearly resolved components observed on a 15 GHz radio map.[9] An 18 centimeter observation with Very Long Baseline Interferometry (VLBI), showed the source is double with two asymmetrical components displaying high surface brightness profiles. The components also display a steep radio spectrum described as straight.[10] Newer VLBI observations made in 2021 at 327 GHz frequencies found the source displays asymmetric lobes that are separated by around 215 milliarcseconds. No radio core has been discovered, although the components have a flat radio spectrum with observed steepening at 610 MHz.[11] A radio jet is present in the source, with a linear size of 1.57 kiloparsecs.[12]

An observation conducted in 1995, found 3C 343.1 has an emission-line nebula region. The radio emission of the region is extended along the direction of the source for more than five arcseconds. making it possible that this could be classified as an extended emission-line region.[13] A linear feature is seen orientating along the east-west axis based on broad-band images.[14] The nuclear spectrum of the galaxy has been found to show either the presence of weak ionization lines or none at all. Little signs of polarization have also been detected in the galaxy.[15]

References

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  1. ^ a b c d e f g "NED Search results for 3C 343.1". NASA/IPAC Extragalactic Database. Retrieved 2025-09-28.
  2. ^ Véron, P. (June 1966). "Optical Positions for Radio Sources in the 3c Revised Catalogue". The Astrophysical Journal. 144: 861. Bibcode:1966ApJ...144..861V. doi:10.1086/148682. ISSN 0004-637X.
  3. ^ Arp, H.; Burbidge, E. M.; Burbidge, G. (2004-02-01). "The double radio source 3C 343.1: A galaxy-QSO pair with very different redshifts". Astronomy & Astrophysics. 414 (3): L37 – L40. arXiv:astro-ph/0401007. Bibcode:2004A&A...414L..37A. doi:10.1051/0004-6361:20031745. ISSN 0004-6361.
  4. ^ Hirst, Paul; Jackson, Neal; Rawlings, Steve (December 2003). "Near-infrared spectroscopy of powerful compact steep-spectrum radio sources". Monthly Notices of the Royal Astronomical Society. 346 (3): 1009–1020. arXiv:astro-ph/0309055. Bibcode:2003MNRAS.346.1009H. doi:10.1111/j.1365-2966.2003.07155.x. ISSN 0035-8711.
  5. ^ Privon, G. C.; O’Dea, C. P.; Baum, S. A.; Axon, D. J.; Kharb, P.; Buchanan, C. L.; Sparks, W.; Chiaberge, M. (April 2008). "WFPC2 LRF Imaging of Emission-Line Nebulae in 3CR Radio Galaxies". The Astrophysical Journal Supplement Series. 175 (2): 423–461. arXiv:0710.3105. Bibcode:2008ApJS..175..423P. doi:10.1086/525024. ISSN 0067-0049.
  6. ^ Spinrad, H.; Westphal, J.; Kristian, J.; Sandage, A. (September 1977). "Spectroscopy and photometry of the distant radio galaxy 3C 343.1". The Astrophysical Journal. 216: L87. Bibcode:1977ApJ...216L..87S. doi:10.1086/182517. ISSN 0004-637X.
  7. ^ Westhues, Christian; Haas, Martin; Barthel, Peter; Wilkes, Belinda J.; Willner, S. P; Kuraszkiewicz, Joanna; Podigachoski, Pece; Leipski, Christian; Meisenheimer, Klaus; Siebenmorgen, Ralf; Chini, Rolf (2016-04-20). "Star Formation in 3CR Radio Galaxies and Quasars at AT z < 1*". The Astronomical Journal. 151 (5): 120. arXiv:1602.07443. Bibcode:2016AJ....151..120W. doi:10.3847/0004-6256/151/5/120. ISSN 0004-6256.
  8. ^ McCarthy, Patrick J.; Miley, George K.; de Koff, Sigrid; Baum, Stefi A.; Sparks, William B.; Golombek, Daniel; Biretta, John; Macchetto, Ferdinando (October 1997). "Hubble Space Telescope Snapshot Survey of 3CR Radio Source Counterparts. II. Radio Galaxies with z > 0.5". The Astrophysical Journal Supplement Series. 112 (2): 415–421. Bibcode:1997ApJS..112..415M. doi:10.1086/313035. ISSN 0067-0049.
  9. ^ 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.
  10. ^ Fanti, C.; Fanti, R.; Parma, P.; Schilizzi, R.T.; 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.
  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. ^ Kawakatu, Nozomu; Nagao, Tohru; Woo, Jong-Hak (2009-03-10). "Exploring the Disk-Jet Connection From the Properties of Narrow-Line Regions in Power Young Radio-Loud Activie Galactic Nuclei". The Astrophysical Journal. 693 (2): 1686–1695. arXiv:0812.1329. doi:10.1088/0004-637x/693/2/1686. ISSN 0004-637X.
  13. ^ McCarthy, Patrick J.; Spinrad, Hyron; van Breugel, Wil (July 1995). "Emission-Line Imaging of 3CR Radio Galaxies. I. Imaging Data". The Astrophysical Journal Supplement Series. 99: 27. Bibcode:1995ApJS...99...27M. doi:10.1086/192178. ISSN 0067-0049. Archived from the original on 2024-02-16.
  14. ^ Axon, D. J.; Capetti, A.; Fanti, R.; Morganti, R.; Robinson, A.; Spencer, R. (November 2000). "The Morphology of the Emission-Line Region Of Compact Steep-Spectrum Radio Sources". The Astronomical Journal. 120 (5): 2284–2299. arXiv:astro-ph/0006355. Bibcode:2000AJ....120.2284A. doi:10.1086/316838. ISSN 0004-6256.
  15. ^ Tran, Hien D.; Cohen, Marshall H.; Ogle, Patrick M.; Goodrich, Robert W.; di Serego Alighieri, Sperello (1998-06-20). "Scattered Radiation from Obscured Quasars in Distant Radio Galaxies". The Astrophysical Journal. 500 (2): 660–672. arXiv:astro-ph/9801063. Bibcode:1998ApJ...500..660T. doi:10.1086/305752. ISSN 0004-637X.
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