Research on CSS 1150+497(4C49.22) in the Radio Band

The compact steep-spectrum(CSS) source 1150+497 was observed with the Very Long Baseline Array(VLBA) at 5GHz and 8GHz bands.The obtained total intensity image at 5GHz shows that 1150+497 has a bright one-side jet.At 5GHz,there are three knots in the southwest and one knot in the northeast.At 8GHz,two knots can be modeled in the southwest.Analyzing imagesat 5GHz band in 3 epochs from1 982 to 2001,an estimate of separation velocity 0.478±0.007mas/year is derived as the relative motions of components A and E.