Dying radio galaxies in the LOFAR Lockman Hole

M. Brienza, E. K. Mahony, R. Morganti, Isabella Prandoni, Leith Godfrey

Research output: Contribution to conferencePaperAcademic

Abstract

After the jets have switched off, radio galaxies undergo a fading phase which is often named the dying phase. The luminosity evolution of the remnant plasma during this period is still poorly constrained because of the paucity of objects detected. Using the new 150-MHz deep LOFAR observations of the well-known extragalactic field the Lockman Hole, we performed a systematic search of dying radio sources aiming to provide good statistics on their detection and properties. To avoid selection biases towards any specific class of dying sources we used both morphological and spectral selection criteria. To do this we combined the LOFAR data with publicly available surveys at other frequencies as well as dedicated deep observations. Our preliminary results, show that the fraction of candidate dying radio sources is < 6-8% of the entire radio source population and is dominated by steep spectrum sources. By comparing these observational results with statistical modelling of the radio sky population we will be able to constrain the main mechanisms contributing to the dying radio galaxy luminosity evolution.

Original languageEnglish
Publication statusPublished - 2015
EventMany Facets of Extragalactic Radio Surveys, EXTRA-RADSUR 2015: CNR Research Area - Bologna, Italy
Duration: 20-Oct-201523-Oct-2015

Conference

ConferenceMany Facets of Extragalactic Radio Surveys, EXTRA-RADSUR 2015
CountryItaly
CityBologna
Period20/10/201523/10/2015

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