4C 25.43, DA 345, NRAO 424,LEDA 2817651, LHE 347, CTA 61,QSO B1328+254
3C 287 is aquasar located in theconstellation ofComa Berenices. It has aredshift of (z) 1.055,[1][2] and such classified as a prototype compact steep spectrum source (CSS).[3] This object was first discovered between January and February 1964 via a photographictwo-color technique.[4]
3C 287 is classified as radio-loud quasar with agigahertz peakedspectrum.[1] It is found to havecontinuumradio emission in southwest direction, likely originating from either anM-type star or an underlyinggalaxy that is located from the object.[5] It is a candidate precessing source, shown to have a position displacement between 2014 and 2017, likely caused by the brightening of a new component.[6][7] A bright companion can be found southwest from the object.[8]
The radio source of 3C 287 is compact with no signs of a secondary structure.[9] Based on radio mapping images made byvery long baseline interferometry (VLBI) andMERLIN, it contains several filamentary structures located both west and southwest directions, hinting the continuation of aspiral pattern.[10] There is a bright compact component located in the center of the source, revealed to be a small radio core whose extent is measured lower than 4milliarcseconds.[1][3] There is a curvedjet. At both frequencies, thebrightness of the source exhibits a decrease with its two-pointspectral index showing a shift from 0.5 to 1.5 along a ridge line.[3][6] Radio polarimetric observations taken byVery Long Baseline Array (VLBA) at sub-arcsecond resolutions, showed the source is classified as point-like. There is a much weaker extension located in the south.[11]
X-bandpolarimetric observations of 3C 287 captured by VLBA, found most of thepolarized emission originated from the brightest region. Based on results, itsmagnetic field geometry is found complex exhibiting a 90° on a milliarcsecond scale.[12]
