TXS 0211−122 is a high redshiftradio galaxy located in the constellation ofCetus. Theredshift of the object is (z) 2.338[1] and it was first discovered by R. van Ojik and otherastronomers in September 1994, who found the object has an ultra steepradio spectrum.[2]
The host galaxy of TXS 0211−122 is found to be extremely massive, containing a bright central nucleus with a much smaller clump feature, based on imaging made byHubble Space Telescope (HST). It is also shown to be astarburst galaxy undergoing an immense wave ofstar formation in its central region.[3][2][4] The totalmolecular hydrogen amount of the galaxy is 1011 Mʘ and it has astellar mass of around 1.45 x 1011 Mʘ.[5][6]
Theradio source is classified as a double with aFanaroff-Riley Class Type II morphology. Thefluxdensity of the source has been estimated to be 189mJy at 1465 MHz. A weak radio core is found between theradio lobes of the source.[2] A curved and bentradio jet has also been discovered, extending outwards from the core towards the eastern lobe.[4] This has been suggested to interact with the interstellar medium.[7]
A study showed the jet is driving the outflows from the galaxy. The narrow component containsinterstellar gas that is both extended and elongated along the radioaxis position from the south-east to north-west. On the eastern side of the nucleus, the line widths are different, with afull-width at half maximum of 300kilometers perseconds which is more compared to the western side.[8] The galaxy is also surrounded by a largeLyman-alpha emissionnebula with polarization which increases east from the nucleus to 16.4 ± 4.6%. A shell structure is found associated with the nebula, interpreted as a product ofsupernovae depositingenergy into the interstellar medium, thus creating expanding gas bubbles.[9]
^Pentericci, L.; McCarthy, P. J.; Röttgering, H. J. A.; Miley, G. K.; van Breugel, W. J. M.; Fosbury, R. (July 2001). "NICMOS Observations of High-Redshift Radio Galaxies: Witnessing the Formation of Bright Elliptical Galaxies?".The Astrophysical Journal Supplement Series.135 (1):63–85.arXiv:astro-ph/0102323.Bibcode:2001ApJS..135...63P.doi:10.1086/321781.ISSN0067-0049.
^abPentericci, L.; Rottgering, H. J. A.; Miley, G. K.; McCarthy, P.; Spinrad, H.; Breugel, W. J. M. van; Macchetto, F. (1998-09-05),HST images and properties of the most distant radio galaxies,arXiv:astro-ph/9809056, arXiv:astro-ph/9809056
