# 3C 300

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Radio galaxy in the constellation of Boötes

3C 300 SDSS image of 3C 300. Observation data (J2000.0 epoch) Constellation Boötes Right ascension 14h 23m 01.00s[1] Declination +19° 35′ 17.98″[1] Redshift 0.270000[1] Heliocentric radial velocity 80,944 km/s[1] Distance 3.243 Gly Apparent magnitude (V) 18.73 Characteristics Type E;Radio galaxy HEG[1] Other designations 4C +19.46, PKS 1420+19, DA 366, OQ +134, NRAO 0443, TXS 1420+198, CoNFIG 192, Cul 1420+198[1]

**3C 300** is a [radio galaxy](/source/Radio_galaxy)[2] located in the constellation of [Boötes](/source/Bo%C3%B6tes). The [redshift](/source/Redshift) of the object is (z) 0.270[1] and it was first discovered as a [radio source](/source/Astronomical_radio_source) in 1959.[3] It was subsequently identified with a galaxy counterpart in June 1966 and designated as **4C 19.46** by the [Fourth Cambridge Survey](/source/Fourth_Cambridge_Survey) in 1968.[4][5]

## Description

VLT [MUSE](/source/Multi-unit_spectroscopic_explorer) image of the EELR with oxgen in green and [H-alpha](/source/Hydrogen-alpha) in orange.

3C 300 is a high-excitation [Fanaroff-Riley Class](/source/Fanaroff%E2%80%93Riley_classification) Type 2 radio galaxy,[6] hosted by a compact [elliptical galaxy](/source/Elliptical_galaxy) that is located in a poor [galaxy cluster](/source/Galaxy_cluster).[7][8] The appearance of the galaxy is described as highly elongated with faint tidal distortions, a boxy isophotal structure and an apparent [V magnitude](/source/Apparent_magnitude) of 19.0.[8][9][10] A small companion galaxy is located 8.14 [arcseconds](/source/Minute_and_second_of_arc) away in the west direction, shown to be heavily involved in the interaction and [merging process](/source/Galaxy_merger) with the galaxy.[11] There are also high [surface brightness](/source/Surface_brightness) regions in the galaxy along with a patch of [radio emission](/source/Radio_wave) located east from its extended nucleus.[7][12] The total [star formation](/source/Star_formation) of 3C 300 is 3.3+0.7-0.7 M☉ per year, with a total [infrared](/source/Infrared) luminosity of 19.0+3.8-4.1 × 109 [L☉](/source/Solar_luminosity).[13]

The [extended emission-line region](/source/Extended_emission-line_region) (EELR) of 3C 300,[14] has an S-shaped morphology with a total extent of 60 kiloparsecs in east to west direction and displaying [rotation](/source/Rotation) that is well-ordered along the position of its major radio [axis](/source/Axial_tilt). Diffused emission is seen on the north and west side of the region.[15] Nuclear outflows are evident, with the outflow being mainly influenced by a blue component whose maximum [velocity](/source/Velocity) peaks at 2160 kilometers per seconds.[16]

The radio source of 3C 300 is classified as a double, based on observations made by J.M. Riley and G.G. Pooley using the Cambridge 50-km Telescope in 1975.[17] When observed on a radio map, the source contains multiple components with a total [spectra index](/source/Spectral_index) value of 0.83 ± 0.10.[18] High resolution imaging made by the [Very Long Baseline Array](/source/Very_Long_Baseline_Array) (VLA) would paint a different picture for the source, describing it as asymmetrical with a hotspot located in the eastern direction. When further imaged, the hotspot has a double structure with an elongated component at its western edge and a brighter component that is being extended back towards the radio core position. Two other components are located inside a high surface brightness area.[19] The northern [radio lobe](/source/Radio_galaxy) of 3C 300 displays a high speed of 0.026 ± 0.045c, compared to its shorter southern radio lobe. This implies the northern radio lobe is residing within a low external [gas density](/source/Density) area.[20]

A [jet](/source/Astrophysical_jet) is present inside the western radio lobe of 3C 300, from the core to the terminating point of the hotspot region. This jet might also be bent too, given the change of [angle](/source/Angle) between 10° and 15°.[19] An observation made in 1998 found the jet is straight with a [flux](/source/Flux) density of 8.06 [GHz](/source/Hertz) and has a length of 4.70 kiloparsecs.[21] A [supermassive black hole](/source/Supermassive_black_hole) mass of 12.7+5.6-5.0 × 107 M☉ has been estimated for the galaxy.[13]

## 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 300"](https://ned.ipac.caltech.edu/byname?objname=3C+300&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1). *NASA/IPAC Extragalactic Database*. Retrieved 2025-09-21.

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1. **[^](#cite_ref-18)** Burch, S. F. (1979-03-01). ["Multifrequency studies of seven 3CR radio sources - II. Results and interpretation"](https://watermark02.silverchair.com/mnras186-0519.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA14wggNaBgkqhkiG9w0BBwagggNLMIIDRwIBADCCA0AGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMJFyIYTfumdMyfA-kAgEQgIIDESDNmyD8S0_6-O6HmvzF7hY1KYDxVd1GpnrQkBecExpNWGhNC3noKY2sm8jOucAwawiXiJrfw6VjKI4tGrhYmtCoof6FTTAxkvFy1HqHHMqtURhabwye4yc0LpgOmFLKTzEVeWfCJEQqvMxNG2fsRjtAajTLyd1mfe8k-W8PyogaXEbEnB_XEAE3M729vRfzmQ4HL6axNl1rFNv-p086izon70A_4fcz9RTa-Y7MCPggQV8nz-0eJ38-sdgK18Qao_JlnX6hvhr-zDZEpIVIHixqUKjmP4tC9xbRNo5Tdi2SJPreTHTa9Du4P0ZUiCzp6C2xi40EUnM1RrzEhDk2XB7eWLGP0eo5DsmaLOhJkH7VTk1R-4Z8eM0Ix9Ic1iinr85knhalsN5QCcKDGzLpDdlR6QSIVjlJh_2SONPxz3XjXsVwv6GLtBT0ngeX_5UiAJBC0mJrtHgzAGkqXEvzvXiV408oCvVZXzyZNw1A9YIMx9Vjz7D5L1RifLBNIJyVSfnrwsw1OjV_nIXWigaAyH6xBeiJv0GzdkP36XekU-L7ldHB_cbt8YpQTZ7D664cLBQXOQNlKsPljDCDGjFpyfenzsP8LHc5nR2Cdn9sDSSTTxbWoxYY1wSOCGXBXAVLuK6O-ISNxrPyJQdIYZd4BiGJ_swN_BhX_fsNZyVYv5TvnZQczQBmQ462qLTtqZhHVxfcj5-8sdk_2JjOzS6WkHAsHnmy35tCdgBxUSQCxcUSg4yFlX5jmBFC7oIkaRtLbMCeNCBHSLyQ7y4nnLa7DFqvL1SfsXOTAbfDVnZPjSG0ytAExv3NxtAcniYjA2p_rHT2kondy1Q74o-CKT7pjcCcuv9OZ_zlzxOp53wzsJr3MhPXtRrqJ54x4IzWRa-KcfWbXVp77TC5QqPBl_MWCqkjPjlSp8Tzo_mUVUyMgvUprswJozkk-iCcY_T_Nnb8JvZFFcR_ydrbyYQRa3CVVH79zurZ62KXUcXc5F1RtXg1gqjb8LH-QWvmbE9KprIdI_9YPG6ofnqmdApARgnjuRPo) (PDF). *Monthly Notices of the Royal Astronomical Society*. **186** (3): 519–553. [doi](/source/Doi_(identifier)):[10.1093/mnras/186.3.519](https://doi.org/10.1093%2Fmnras%2F186.3.519). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. ^ [***a***](#cite_ref-:3_19-0) [***b***](#cite_ref-:3_19-1) Hardcastle, M. J.; Alexander, P.; Pooley, G. G.; Riley, J. M. (July 1997). ["High-resolution observations at 3.6cm of seventeen FRII radio galaxies with 0.15<z<0.30"](https://articles.adsabs.harvard.edu/pdf/1997MNRAS.288..859H). *Monthly Notices of the Royal Astronomical Society*. **288** (4): 859–890. [doi](/source/Doi_(identifier)):[10.1093/mnras/288.4.859](https://doi.org/10.1093%2Fmnras%2F288.4.859). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-20)** Harwood, Jeremy J.; Hardcastle, Martin J.; Croston, Judith H.; Goodger, Joanna L. (2013-09-12). ["Spectral ageing in the lobes of FR-II radio galaxies: new methods of analysis for broad-band radio data"](https://doi.org/10.1093%2Fmnras%2Fstt1526). *Monthly Notices of the Royal Astronomical Society*. **435** (4): 3353–3375. [arXiv](/source/ArXiv_(identifier)):[1308.4137](https://arxiv.org/abs/1308.4137). [doi](/source/Doi_(identifier)):[10.1093/mnras/stt1526](https://doi.org/10.1093%2Fmnras%2Fstt1526). [ISSN](/source/ISSN_(identifier)) [1365-2966](https://search.worldcat.org/issn/1365-2966).

1. **[^](#cite_ref-21)** Hardcastle, M. J.; Alexander, P.; Pooley, G. G.; Riley, J. M. (May 1998). ["FRII radio galaxies with z<0.3 - I. Properties of jets, cores and hotspots"](https://watermark02.silverchair.com/296-2-445.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA2IwggNeBgkqhkiG9w0BBwagggNPMIIDSwIBADCCA0QGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMbbh8RjeMi81W0X9LAgEQgIIDFXM-hJ0sp-1l72sZ09YhvIvL7KfsgJ_sF6FaVm-DjSZkhQAGdbhISjieimMeTUray2KVOS5TkT7wLA5dVsV2ek3D2bbEUfLcfU1_FE8CAJrliuwMsS4F0SPf355DoIKZ-Btj_1KnXS9LE1Mls6C0Kkvb02oAjNHlnwXfp_ALD9yWtsoMb4HetqAbTDFHP_rI-CDqHVvEGmzRhTE4o9ER0ZCFy5S_FxtBth1r9msecFGjSUlNKNPbdSOc5ztM-s0HyhYQT82QThDI7eiJh2I-kB4zJ1AsIj8ERcjIz60kg4W6njVV1nB2Ji6rhrkPQ665CtB_dP8grkS-zPLBtCGgBhYk6TRYTpvtigQSQ5unhkF-wFeq3YPY71QsTFxKGKfrB6XcjuQ-VYUReru5TRHr-skzZfuLP7-2rHksVZ-kaVIbpDy3hBYKTTXwjxjbcUc_JzMlh5nu2xMejkQPwErFTSxwPcvr1c0WjJQBRdTPQYhFdwk_mnpeCY1ys6FfSxjP0oKG9Np5GVKwA7nq3PFgsidMgeqahSqCV2tBGVbvl7UVnUBtc4k8gab3eEjR-Hqs-KKLM-U44PmeHXChXrZDN5J8CgTTwB1CEHlm7dV5oQSPFRyEfFBpiV1b9gU7yyX0zGXiuyoPbQH5uE0nSVov9SSoS7AkPnXSY3mznasVGduwse-i7oSNa_SdINNuTe-wpl6RZptP_idGJKM1is1z31F12zFecWzD7B_BG2LpaiZxJKTHqmjLIZ4KhPbOFZNgkcgPzyZnsbK37LOIU9b4bBXyipkQxB_ia-oVpn81blhoZ38LjBd1iVBT-HmrE7uV2ke5BYy61vHQZBT3hjZwib5SkI_fP8lG2jysi1S0tv585936SKooGq7DnSZ-RTtBw3VxGgBgtFSykC_0TArkWk-ayV0Pu5JDOz-e3gxvP6CpTpPFkNW7h48_3K3nVxKgJhWxUNMuvt9bC357bECxDLEnpZF2K-mwPIN7DZiuydY85Mjzck3LI19F74NKmXrei855vYZPUGvJCRIcKLu2AUDnEKiSRA) (PDF). *Monthly Notices of the Royal Astronomical Society*. **296** (2): 445–462. [arXiv](/source/ArXiv_(identifier)):[astro-ph/9801179](https://arxiv.org/abs/astro-ph/9801179). [Bibcode](/source/Bibcode_(identifier)):[1998MNRAS.296..445H](https://ui.adsabs.harvard.edu/abs/1998MNRAS.296..445H). [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.1998.01480.x](https://doi.org/10.1046%2Fj.1365-8711.1998.01480.x). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

## External links

- 3C 300 on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=3C+300&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=3C+300&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=3C+300&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=3C+300&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=3C+300&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=3C+300&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=3C+300&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=3C+300), [Articles and images](http://www.wikisky.org/starview?object=3C+300)

- [3C 300 on SIMBAD](http://simbad.u-strasbg.fr/simbad/sim-id?bibyear1=1850&bibyear2=%24currentYear&submit=Display&Ident=%402252761&Name=3C+300&bibdisplay=refsum&bibyear1=1850&bibyear2=%24currentYear#lab_bib)

v t e Constellation of Boötes Boötes in Chinese astronomy Boötes Void List of stars in Boötes Stars Bayer α (Arcturus) β (Nekkar) γ (Seginus) δ (Qigong) ε (Izar, Pulcherrima) ζ η (Muphrid) θ ι κ λ (Xuange) μ1 (Alkalurops) μ2 ν1 ν2 ξ ο π ρ (Kalasungsang) σ (Genghe) τ (Tepiamenit) υ φ χ ψ ω Flamsteed 1 2 3 6 (e) 7 9 10 11 12 (d) 13 14 15 18 20 22 (f) 24 (g) 26 31 32 33 34 (Alrumh) 38 (Merga) 39 40 44 (Quadrans) 45 (c) 46 (b) 47 (k) 50 Variable R S T RX ZZ AB BL BP BX BY CE CH CI CN CP CR CX CY (101 Vir) DE EK HN HP HD 118508 118889 122563 125040 125351 (A) 125658 126128 126129 126141 126200 126271 127304 127334 127726 128093 128198 129132 129357 130084 130603 130917 131040 131473 131496 (Arcalís) 132029 132406 132563 134064 134335 135438 135530 135944 141399 Other 2MASS J15031961+2525196 CFBDSIR 1458+10 Gliese 526 HAT-P-4 LHS 2924 PSR J1544+4937 SDSS J1416+1348 SDSS J1433+1011 TVLM 513-46546 WASP-14 WD 1425+540 ZTF J153932.16+502738.8 Exoplanets HAT-P-4b HD 128311 b c HD 132406 b HD 136418 b (Awasis) τ Boötis b TOI-1853 b WASP-14b Star clusters NGC 5466 Galaxies NGC 5008 5248 5251 5416 5490 5500 5504 5508 5514 5523 5529 5532 5533 5535 5539 5541 5544 5545 5548 5557 5559 5562 5579 5582 5591 5601 5603 5609 5613 5614 5615 5624 5629 5630 5641 5642 5653 5665 5676 5681 5682 5683 5698 5714 5722 5752 5753 5754 5755 5772 5778 5784 5790 5820 5821 5829 5837 5857 5875 5876 5886 5888 5896 5929 5930 5966 Numbered I II III Other 3C 295 3C 299 3C 300 3C 303 3C 315 4C 19.44 4C +26.42 7C 1354+2552 Abell 2009 BCG Arp 302 B2 1420+32 B2 1441+26 CEERS-2112 CEERS-93316 CEERS2-588 CLASS B1359+154 Cloverleaf quasar DDO 190 EGS-zs8-1 EGS-z11-R0 EGSY8p7 H1426+428 IC 4397 IC 4461 IC 4462 IC 4481 IC 4516 IRAS 13349+2438 IRAS 14394+5332 IRAS 15206+3342 LEDA 2108986 MACS 1423-z7p64 MACS J1447.4+0827 BCG Maisie's Galaxy Markarian 463 Markarian 471 Markarian 478 MS 1455.0+2232 BCG MS 1512-cB58 NVSS J141343+433945 OQ 172 OQ 530 PG 1411+442 PG 1543+489 PGC 93125 PGC 1470080 PKS 1345+125 PKS 1413+135 QSO B1422+202 RBS 1467 RGZ J145001.5+144747 RGZ J145039.8+441829 SBS 1415+437 SDSS J135646.10+102609.0 SDSS J1430+2303 Teacup galaxy UGC 8669 UGC 9128 UGC 9425 UGC 9684 UGC 9796 ULAS J1342+0928 VV 191 Galaxy clusters Abell 1795 Abell 1991 BoRG-58 IDCS J1426.5+3508 Astronomical events GRB 990123 GRB 080319B SCP 06F6 SN 2003fg SN 2005bc SN 2020tlf Category

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Adapted from the Wikipedia article [3C 300](https://en.wikipedia.org/wiki/3C_300) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/3C_300?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.