Landing page for project EM150

Luminous far-infrared quasars are thought to be transition objects with both extreme star-formation and AGN activity. However, the effect of the AGN activity on star-formation, through the mechanical feedback from radio-jets and the excitation provided by the extreme radiation field of the AGN is not well understood. In this proposal, we request 12 h of EVN imaging of the well-studied luminous, and gravitationally lensed quasar, the Cloverleaf (at redshift 2.56). This object has extensive optical (HST) and mm-continuum and -line observations (ALMA) that trace the burst of star-formation across the source. Here, we aim to map the radio jets from this source between 5 and 170 mas-scales, equivalent to ~5 to 150 parsecs, after correcting for the resolution boost provided by the gravitational lens. These data will be combined and compared to the extensive ancillary dataset for this object, to determine what effect the AGN-jets have on the triggering of star-formation within this object and test whether AGN feedback plays any role in the excitation and collapse of the molecular gas reservoir in this quasar. (Resubmission due to failed observation)

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197