# 3C 343.1

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/3C_343.1
> Markdown URL: https://mediated.wiki/source/3C_343.1.md
> Source: https://en.wikipedia.org/wiki/3C_343.1
> Source revision: 1348373960
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Radio galaxy in the constellation Draco

3C 343.1 SDSS image of 3C 343.1 Observation data (J2000.0 epoch) Constellation Draco Right ascension 16h 38m 28.22s[1] Declination +62° 34′ 44.31″[1] Redshift 0.752380[1] Heliocentric radial velocity 225,558 km/s[1] Distance 6.777 Gly Apparent magnitude (V) 20.7 Characteristics Type NLRG 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](/source/Radio_galaxy) located in the constellation of [Draco](/source/Draco_(constellation)). The [redshift](/source/Redshift) of the object is (z) 0.752[1] and it was first recorded in the [Third Cambridge Catalogue of Radio Sources](/source/Third_Cambridge_Catalogue_of_Radio_Sources) survey in 1966.[2] It is also a [quasar](/source/Quasar), pairing up with a foreground galaxy located at (z) 0.344,[3] and is classified as a compact steep [spectrum](/source/Spectrum) source (CSS).[4][5]

## Description

The host galaxy of 3C 343.1 has a blue appearance mainly due to the presence of an early-type [stellar population](/source/Stellar_population) or a recent wave of [star formation](/source/Star_formation).[6] The total star formation rate of the galaxy is estimated to be 1.7+0.5-0.4 × 1011 M☉, with the host [infrared](/source/Infrared) [luminosity](/source/Luminosity) estimated to be 2.9+0.6-0.5 × 1011 [L☉](/source/Solar_luminosity). It has a [supermassive black hole](/source/Supermassive_black_hole) mass of 28.7 × 107 M☉.[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](/source/Very_Large_Array) (VLA), the source has an elongated appearance in the [position angle](/source/Position_angle) of 110°, with two clearly resolved components observed on a 15 [GHz](/source/Hertz) radio map.[9] An 18 [centimeter](/source/Centimetre) observation with [Very Long Baseline Interferometry](/source/Very-long-baseline_interferometry) (VLBI), showed the source is double with two asymmetrical components displaying high [surface brightness](/source/Surface_brightness) profiles. The components also display a steep [radio spectrum](/source/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](/source/Minute_and_second_of_arc). No radio core has been discovered, although the components have a flat [radio spectrum](/source/Radio_spectrum) with observed steepening at 610 [MHz](/source/Hertz).[11] A [radio jet](/source/Astrophysical_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](/source/Spectral_line) nebula region. The [radio emission](/source/Radio_wave) of the region is extended along the direction of the source for more than five [arcseconds](/source/Minute_and_second_of_arc). making it possible that this could be classified as an [extended emission-line region](/source/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](/source/Ionization) lines or none at all. Little signs of [polarization](/source/Polarization_(waves)) have also been detected in the galaxy.[15]

## References

1. ^ [***a***](#cite_ref-ned_1-0) [***b***](#cite_ref-ned_1-1) [***c***](#cite_ref-ned_1-2) [***d***](#cite_ref-ned_1-3) [***e***](#cite_ref-ned_1-4) [***f***](#cite_ref-ned_1-5) [***g***](#cite_ref-ned_1-6) ["NED Search results for 3C 343.1"](https://ned.ipac.caltech.edu/byname?objname=3C+343.1&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2025-09-28.

1. **[^](#cite_ref-2)** Véron, P. (June 1966). ["Optical Positions for Radio Sources in the 3c Revised Catalogue"](https://doi.org/10.1086/148682). *The Astrophysical Journal*. **144**: 861. [Bibcode](/source/Bibcode_(identifier)):[1966ApJ...144..861V](https://ui.adsabs.harvard.edu/abs/1966ApJ...144..861V). [doi](/source/Doi_(identifier)):[10.1086/148682](https://doi.org/10.1086%2F148682). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-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"](https://www.aanda.org/articles/aa/abs/2004/06/aafj201/aafj201.html). *Astronomy & Astrophysics*. **414** (3): L37–L40. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0401007](https://arxiv.org/abs/astro-ph/0401007). [Bibcode](/source/Bibcode_(identifier)):[2004A&A...414L..37A](https://ui.adsabs.harvard.edu/abs/2004A&A...414L..37A). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20031745](https://doi.org/10.1051%2F0004-6361%3A20031745). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-4)** Hirst, Paul; Jackson, Neal; Rawlings, Steve (December 2003). ["Near-infrared spectroscopy of powerful compact steep-spectrum radio sources"](https://doi.org/10.1111%2Fj.1365-2966.2003.07155.x). *Monthly Notices of the Royal Astronomical Society*. **346** (3): 1009–1020. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0309055](https://arxiv.org/abs/astro-ph/0309055). [Bibcode](/source/Bibcode_(identifier)):[2003MNRAS.346.1009H](https://ui.adsabs.harvard.edu/abs/2003MNRAS.346.1009H). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2003.07155.x](https://doi.org/10.1111%2Fj.1365-2966.2003.07155.x). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-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](/source/ArXiv_(identifier)):[0710.3105](https://arxiv.org/abs/0710.3105). [Bibcode](/source/Bibcode_(identifier)):[2008ApJS..175..423P](https://ui.adsabs.harvard.edu/abs/2008ApJS..175..423P). [doi](/source/Doi_(identifier)):[10.1086/525024](https://doi.org/10.1086%2F525024). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. **[^](#cite_ref-6)** Spinrad, H.; Westphal, J.; Kristian, J.; Sandage, A. (September 1977). ["Spectroscopy and photometry of the distant radio galaxy 3C 343.1"](https://articles.adsabs.harvard.edu/pdf/1977ApJ...216L..87S). *The Astrophysical Journal*. **216**: L87. [Bibcode](/source/Bibcode_(identifier)):[1977ApJ...216L..87S](https://ui.adsabs.harvard.edu/abs/1977ApJ...216L..87S). [doi](/source/Doi_(identifier)):[10.1086/182517](https://doi.org/10.1086%2F182517). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-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*"](https://doi.org/10.3847%2F0004-6256%2F151%2F5%2F120). *The Astronomical Journal*. **151** (5): 120. [arXiv](/source/ArXiv_(identifier)):[1602.07443](https://arxiv.org/abs/1602.07443). [Bibcode](/source/Bibcode_(identifier)):[2016AJ....151..120W](https://ui.adsabs.harvard.edu/abs/2016AJ....151..120W). [doi](/source/Doi_(identifier)):[10.3847/0004-6256/151/5/120](https://doi.org/10.3847%2F0004-6256%2F151%2F5%2F120). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-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"](https://iopscience.iop.org/article/10.1086/313035/pdf). *The Astrophysical Journal Supplement Series*. **112** (2): 415–421. [Bibcode](/source/Bibcode_(identifier)):[1997ApJS..112..415M](https://ui.adsabs.harvard.edu/abs/1997ApJS..112..415M). [doi](/source/Doi_(identifier)):[10.1086/313035](https://doi.org/10.1086%2F313035). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. **[^](#cite_ref-9)** Pearson, T. J.; Readhead, A. C. S.; Perley, R. A. (May 1985). ["Compact radio sources in the 3C catalog"](https://articles.adsabs.harvard.edu/pdf/1985AJ.....90..738P). *The Astronomical Journal*. **90**: 738. [Bibcode](/source/Bibcode_(identifier)):[1985AJ.....90..738P](https://ui.adsabs.harvard.edu/abs/1985AJ.....90..738P). [doi](/source/Doi_(identifier)):[10.1086/113782](https://doi.org/10.1086%2F113782). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-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"](https://web.archive.org/web/20240327105002/https://ui.adsabs.harvard.edu/abs/1985A&A...143..292F/abstract). *Astronomy and Astrophysics*. **143**: 292. [Bibcode](/source/Bibcode_(identifier)):[1985A&A...143..292F](https://ui.adsabs.harvard.edu/abs/1985A&A...143..292F). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). Archived from [the original](https://articles.adsabs.harvard.edu/pdf/1985A%26A...143..292F) on 2024-03-27.

1. **[^](#cite_ref-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"](https://doi.org/10.1093%2Fmnras%2Fstab1014). *Monthly Notices of the Royal Astronomical Society*. **504** (2): 2312–2324. [arXiv](/source/ArXiv_(identifier)):[2104.12804](https://arxiv.org/abs/2104.12804). [doi](/source/Doi_(identifier)):[10.1093/mnras/stab1014](https://doi.org/10.1093%2Fmnras%2Fstab1014). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-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](/source/ArXiv_(identifier)):[0812.1329](https://arxiv.org/abs/0812.1329). [doi](/source/Doi_(identifier)):[10.1088/0004-637x/693/2/1686](https://doi.org/10.1088%2F0004-637x%2F693%2F2%2F1686). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-13)** McCarthy, Patrick J.; Spinrad, Hyron; van Breugel, Wil (July 1995). ["Emission-Line Imaging of 3CR Radio Galaxies. I. Imaging Data"](https://web.archive.org/web/20240216072934/https://ui.adsabs.harvard.edu/abs/1995ApJS...99...27M/abstract). *The Astrophysical Journal Supplement Series*. **99**: 27. [Bibcode](/source/Bibcode_(identifier)):[1995ApJS...99...27M](https://ui.adsabs.harvard.edu/abs/1995ApJS...99...27M). [doi](/source/Doi_(identifier)):[10.1086/192178](https://doi.org/10.1086%2F192178). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049). Archived from [the original](https://articles.adsabs.harvard.edu/pdf/1995ApJS...99...27M) on 2024-02-16.

1. **[^](#cite_ref-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](/source/ArXiv_(identifier)):[astro-ph/0006355](https://arxiv.org/abs/astro-ph/0006355). [Bibcode](/source/Bibcode_(identifier)):[2000AJ....120.2284A](https://ui.adsabs.harvard.edu/abs/2000AJ....120.2284A). [doi](/source/Doi_(identifier)):[10.1086/316838](https://doi.org/10.1086%2F316838). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-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"](https://iopscience.iop.org/article/10.1086/305752/fulltext/). *The Astrophysical Journal*. **500** (2): 660–672. [arXiv](/source/ArXiv_(identifier)):[astro-ph/9801063](https://arxiv.org/abs/astro-ph/9801063). [Bibcode](/source/Bibcode_(identifier)):[1998ApJ...500..660T](https://ui.adsabs.harvard.edu/abs/1998ApJ...500..660T). [doi](/source/Doi_(identifier)):[10.1086/305752](https://doi.org/10.1086%2F305752). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

## External links

- 3C 343.1 on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=3C+343.1&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=3C+343.1&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=3C+343.1&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=3C+343.1&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=3C+343.1&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=3C+343.1&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=3C+343.1&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=3C+343.1), [Articles and images](http://www.wikisky.org/starview?object=3C+343.1)

- [3C 343.1 on SIMBAD](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ICRF%20J163828.2%2B623444)

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

---
Adapted from the Wikipedia article [3C 343.1](https://en.wikipedia.org/wiki/3C_343.1) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/3C_343.1?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.