Informazioni sull’evento


Coffee talks

Friday 02/12/2022 @ 11:30, Sala riunioni quarto piano e on-line (

Gulay Gurkan (Thuringia State Observatory - TLS), "Science updates from the ASKAP - GAMA23 survey"

Deep wide-field radio surveys in conjunction with available multi-wavelength data open a range of new exploration windows to the Universe. A 60 square degree southern region was observed with ASKAP at 888 MHz as part of EMU Early Science program, reaching 35microJy/beam sensitivity and 10 arcsec resolution. The observed region has excellent legacy data sets: (i) optical spectroscopy up to z~0.4 provided by GAMA project; (ii) photometric data from optical to mid- and far-infrared; (iii) photometric redshifts reaching distances beyond the spectroscopic limit. The dedicated analysis and source identification along with visual inspection provided ~40000 radio sources detected at 5?, of which 63% have optical counterparts. Initial investigation of the radio sources in the field has revealed 63 giant radio galaxies with sizes going up to 2.7 Mpc. A number of these giant radio galaxies also show linearly polarised emission. As part of ongoing studies of normal and active galaxies, we utilised the depth of this radio survey and the available spectroscopic data to investigate the physical properties of radio-quiet active galaxies at much lower luminosities than any study attempted before. The results show that a link between radio emission and AGN outflows still persists even at low-luminosities. I will present the radio survey (Gurkan et al. 2022) along with the new science results, which are the first steps towards the exciting science with ASKAP in the pre-SKA era.