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- 3C 286, also known by its position as 1328+307 (B1950 coordinates) or 1331+305 (J2000 coordinates), is a quasar at redshift 0.8493 with a radial velocity of 164,137 km/s. It is part of the Third Cambridge Catalogue of Radio Sources (3C Survey). The 3C Survey was conducted at the relatively low radio frequencies of 159 and 178 MHz. The total power measurements were made with an instrument that produced a 4.6 degree by 13.6 arc minute fan-beam, and interferometric measurements were made with a synthesized beam width of about 7.5 arc minutes. Those beams were too broad to produce coordinates precise enough to allow the radio source to be matched with a corresponding faint optical counterpart. In 1962, 3C 286 was observed with the higher frequency two-element interferometer at Owens Valley Radio Observatory, which produced improved source coordinates with a precision of ~10 arc seconds. With the new coordinates, observations at the Palomar Observatory allowed the optical counterpart to be unambiguously identified: a magnitude 17.25 object with a star-like appearance. Because of this early identification of an optical counterpart, 3C 286 was one of the objects described in the paper where the term quaser was first used. 3C 286 is a Compact Steep Spectrum (CSS) source, which means that its size is less than 15 kiloparsecs (13.7 in the case of 3C 286), and the observed spectral flux density is proportional to να, where ν is the frequency and α ≤ -0.5 (in the case of 3C 286 α ≈ -0.61). CSS sources may be relatively young, with jets that are still expanding. While CSS sources represent a large fraction of the radio galaxies found in flux limited surveys, 3C 286 is one of only two CSS sources whose γ-rays were detected by Fermi-LAT. High resolution images made at 8.4 GHz with the Very Large Array show that 3C 286 has a jet about 2.6 arc seconds long extending west-south-west from the core, and a counter jet extending 0.8 arc seconds east from the core. Emission from the jet to the west-south-west is highly polarized, with E-vectors parallel to the jet axis. 3C 286 is one of four primary calibrators used by the Very Large Array (along with 3C 48, , and 3C 147). Visibilities of all other sources are calibrated using observed visibilities of one of these four calibrators. It is an important calibrator for polarization measurements made by radio interferometers, because it has a relatively high degree of linear polarization (~10% at a wavelength of 20 cm, increasing to ~17% at 1.3 mm), and the angle of polarization does not change with time (although it is not independent of the wavelength observed). (en)
- DLA-3C286 è una galassia remota, situata in direzione della costellazione dei Cani da Caccia alla distanza di 6,88 miliardi di anni luce dalla Terra. È dotata di un fortissimo campo magnetico che, nel 2008, è stato misurato da un team di astronomi utilizzando il Radiotelescopio di Green Bank, ed è risultato almeno 10 volte più intenso di quello della Via Lattea con un'estensione di circa 600 anni luce. Il campo magnetico delle galassie, secondo la teoria più accreditata, sarebbe prodotto da un generato dalla rotazione della galassia che crea il campo magnetico in un arco di diversi miliardi di anni. Sorprende pertanto di trovare un campo magnetico così intenso in una galassia molto giovane come DLA-3C286 e ciò porta a considerare la possibilità anche di altri meccanismi.Una spiegazione alternativa potrebbe essere la comparsa di un campo magnetico diretto verso il centro di una galassia massiccia, dato che è noto che i campi magnetici sono più intensi in direzione di galassie vicine. Oppure un campo magnetico così intenso può essere il risultato di un'onda d'urto generato dalla collisione di due galassie. Comunque sia, i ricercatori ritengono che i campi magnetici possono essere fattori importanti per l'evoluzione delle galassie; in particolare possono essere responsabili dei bassi tassi di formazione stellare osservati nelle protogalassie dell'universo primordiale. (it)
- DLA-3C286 – młoda galaktyka o bardzo silnym polu magnetycznym. Galaktyka znajduje się około 6,4 miliardów lat świetlnych od Ziemi i ma około 4 miliardy lat, jej pole magnetyczne zostało zmierzone w 2008 przy pomocy radioteleskopu Green Bank. Naukowcy odkryli, że jest ono ok. 10 razy silniejsze od pola magnetycznego galaktyki, w której znajduje się Ziemia (Droga Mleczna) i rozciąga się aż na 600 lat świetlnych. Według obecnie panujących teorii pole magnetyczne galaktyki powstaje na zasadzie tzw. – buduje się ono początkowo wokół cząsteczek wyrzuconych w kosmos w wyniku wybuchów supernowych, w ciągu miliardów lat, w wyniku ruchu obrotowego galaktyk, cząsteczki te zaczynają działać jak dynamo wzmacniając i ukierunkowując pole magnetyczne galaktyki. Silne i rozległe pole magnetyczne galaktyki tak młodej jak DLA-3C286 sugeruje jednak inny, niewyjaśniony jeszcze model powstawania tych pól. (pl)
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- Quasar 3C 286 as observed with ALMA. The elliptical shape of the image is caused by ALMA's noncircular point spread function . (en)
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- 3C 286, also known by its position as 1328+307 (B1950 coordinates) or 1331+305 (J2000 coordinates), is a quasar at redshift 0.8493 with a radial velocity of 164,137 km/s. It is part of the Third Cambridge Catalogue of Radio Sources (3C Survey). High resolution images made at 8.4 GHz with the Very Large Array show that 3C 286 has a jet about 2.6 arc seconds long extending west-south-west from the core, and a counter jet extending 0.8 arc seconds east from the core. Emission from the jet to the west-south-west is highly polarized, with E-vectors parallel to the jet axis. (en)
- DLA-3C286 è una galassia remota, situata in direzione della costellazione dei Cani da Caccia alla distanza di 6,88 miliardi di anni luce dalla Terra. È dotata di un fortissimo campo magnetico che, nel 2008, è stato misurato da un team di astronomi utilizzando il Radiotelescopio di Green Bank, ed è risultato almeno 10 volte più intenso di quello della Via Lattea con un'estensione di circa 600 anni luce. (it)
- DLA-3C286 – młoda galaktyka o bardzo silnym polu magnetycznym. Galaktyka znajduje się około 6,4 miliardów lat świetlnych od Ziemi i ma około 4 miliardy lat, jej pole magnetyczne zostało zmierzone w 2008 przy pomocy radioteleskopu Green Bank. Naukowcy odkryli, że jest ono ok. 10 razy silniejsze od pola magnetycznego galaktyki, w której znajduje się Ziemia (Droga Mleczna) i rozciąga się aż na 600 lat świetlnych. Silne i rozległe pole magnetyczne galaktyki tak młodej jak DLA-3C286 sugeruje jednak inny, niewyjaśniony jeszcze model powstawania tych pól. (pl)
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- 3C 286 (en)
- DLA-3C286 (it)
- DLA-3C286 (pl)
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