Periodic Reporting for period 1 - Spiral DRAGNs (Here be Spiral DRAGNs)
Reporting period: 2016-05-01 to 2018-04-30
2. The first observation of 0313-192, the archetypal spiral DRAGN, at very long baseline interferometry (VLBI) resolutions. 0313-192 is an edge-on spiral galaxy that appears to host a 360 kpc double-lobed radio source. The core of this galaxy is clearly detected at multiple frequencies using the Very Long Baseline Array, signifying an ongoing active nucleus in the galaxy. This rules out the possibility that the spiral DRAGN is merely a chance alignment. The radio core has L(1.4 GHz) ~ 3.0 × 10^23 W Hz-1. Radio components are detected to the south-west of the core, but there are no detections of a counter jet. Assuming a symmetric, relativistic jet, we estimate an upper limit to the inclination angle of θ ≲ 72 deg. The VLBI-detected radio jet components are extremely well aligned with the larger scale radio source suggesting little to no jet disruption or interaction with the interstellar medium of the host galaxy.
3. Investigations of the circumgalactic medium in the environment of proto-cluster galaxies from observations with the with the Atacama Large Millimeter Array and Australia Telescope Compact Array revealing a cold molecular halo. The molecular cold galactic medium was found to be metal-rich and not diffuse, confirming a link between the cold gas and in situ star formation. This demonstrated that galaxies are able to grow using recycled gas from the cold galactic medium and not necessarily only directly through accretion of gas from the cosmic web.
2. The project has produced the first VLBI scale image of a spiral DRAGN, revealing the central active galactic nucleus for the first time.