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Second largest giant radio quasar, one of the largest galaxies
QSO J0931+3204 is a type I seyfert galaxy, quasar, and elliptical galaxy in the constellation of Leo.[1] The galaxy is at redshift z = 0.022551, equivalent to roughly 3.265 billion light years (1,000.97 megaparsecs) away and has an apparent visual magnitude of 18.76.[1][2] It was discovered in 2003 in the HyperLEDA survey of over 950,000 galaxies.[3]
Physical properties
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QSO J0931+3204 is a large elliptical galaxy and is in fact one of the largest galaxies discovered.[1] The galaxy is 865,600 light years (265.38 kiloparsecs) across based on a distance of 3.265 billion light years (1,000.97 megaparsecs) and an angular diameter of 54.8 arcsecs.[2]
In the galactic center of QSO J0931+3204 is an extremely luminous quasar that has a luminosity of 2.04e+38 watts equal to 533.6 billion L☉.[4] The galactic center contains a massive 100 million M☉ central black hole which is accreting on huge amounts of matter, which is ejecting mass amounts of gas outside the galaxy forming radio lobes.[4] It is possible that QSO J0931+3204 has binary central black holes (BBHs), however this is unlikely.[5]
In 2017, it was discovered using FIRST that QSO J0931+3204 generated a 14.5 million light year (4.447 megaparsec) radio structure based on an angular diameter of 15.2 arcmin and a distance of 1,000.97 megaparsecs.[4] At the time of discovery, QSO J0931+3204 was the largest giant radio quasar (GRQ) ever discovered however a newer 2023 article discovered a larger giant radio quasar designated FBQS J1318+2626 spanning 4.622 megaparsecs.[6]
