| QSO B0153+744 | |
|---|---|
 The quasar QSO B0153+744. | |
| Observation data (J2000.0epoch) | |
| Constellation | Cassiopeia |
| Right ascension | 01h 57m 34.964s |
| Declination | +74° 42′ 43.230″ |
| Redshift | 2.338000 |
| Heliocentric radial velocity | 700,915km/s |
| Distance | 10.512Gly |
| Apparent magnitude (V) | 16.0 |
| Apparent magnitude (B) | 16.0 |
| Characteristics | |
| Type | LPQ, RLQ |
| Other designations | |
| S5 0153+74,NVSS J015735+744241,QSO J0157+1442, RORF 0153+744, 1RXS J015735.2+744246, [HB89] 0153+744 | |
QSO B0153+744 is aquasar[1] located in theconstellation ofCassiopeia. It has aredshift of (z) 2.338[2] and has an optical brightness of mR = 17.5magnitude.[3] It was first discovered as anastronomical radio source in 1988. Theradio spectrum of the source appears as flat when seen at centimeterwavelengths but optically thin atmillimeter wavelengths.[1] This object is also classified as radio-loud and exhibits lowpolarization, making it a low polarized quasar (LPQ).[4]
The radio source of QSO B0153+744 is found to be both one-sided[5] and complex.[6] However, when shown at bothfrequencies, it is revealed as double source that is embedded inside a halo.[7] In its radio structure, the 15.4GHz emission is found to be dominated by two main components with a separation gap of 10milliarcseconds.[5] These two main components are classified as the northern component and southern component respectively. The northern component contains an inverted spectrum whereas the southern component has a steepspectra.[7]
In 1997, these two components of QSO B0153+744 were studied further. This in turn, were confirmed as a jet-core component and a bright secondary component. The former shows core-jet structure made up of four distinctive components, when resolved at 1.3centimeter (cm)wavelengths whereas the latter is stationary and exhibits a complicated structure. Further evidence shows thespectral index of the bright component's emission is near to one of the steep-spectrum jet components at ranges between 6 cm and 3.6 cm.[2]
A strong one-sidedjet is present in QSO B0153+744 with its projected direction changing by an 180°angle.[8][2] There are three other sub-components present (the jet's innermost regions). The two sub-components are shown trailing the jet's direction with a switch of 65° ± 3° at distance r = (0.65 ± 0.05) mas to 88° ± 8° at distance r = (1.35 ± 0.05) mas, while the third sub-component is trailing the jet's outermost regions.[5] Based on the jet's speed and its change of direction, this indicates the radio source of QSO B0153+744 is relatively young.[9]
