PKS J1158+2621

PKS J1158+2621 is classified as a Fanroff-Riley Type 2 radio galaxy. It has two pairs of radio lobes. The first pair are found on the inner side orientated from northwest to southeast directions while the other pair of lobes are on the outer sides in the same direction like the inner lobes. High resolution imaging also found the inner lobes show the presence of structures described as edge-brightened. The outer lobes display surface brightness at their far ends. Traces of radio emission can also be seen at outer ends of each outer lobe. The spectral ages of the outer lobes are estimated to be 135 and 92 million years old. There are also two warm spot features with an estimated age of 10.7 million years.^[4]

The radio core of the galaxy is described as weak with an X-ray spectrum. The spectrum is shown to have a flat photon index, with the core itself displaying an absence of a hard power law.^[6] There are also detections of molecular gas in the galaxy with the lower limit being 0.37 × 10⁹ M_☉ and an upper limit of around 2.09 × 10⁹ M_☉.^[7]

A two sided radio jet is found inside the galaxy with the first half of the jet going in a northwest direction while the other half of the jet is found heading in southeast direction on opposite side. The projected length of the first jet is around 66 kiloparsecs, while the second jet has a length of 56 kiloparsecs.^[8] Radio polarization has also been detected inside the northwestern region of the source when observed at 0.6 GHz frequencies.^[9]

• PKS J1158+2621 on SIMBAD