Dying radio galaxies in the LOFAR Lockman Hole

Journal
Date Issued
2015
Author(s)
•
Mahony, E.
•
Morganti, R.
•
•
Godfrey, L.
DOI
Abstract
After the jets have switched off, radio galaxies undergo a fading phase which is often named thedying phase. The luminosity evolution of the remnant plasma during this period is still poorlyconstrained because of the paucity of objects detected. Using the new 150-MHz deep LOFARobservations of the well-known extragalactic field the Lockman Hole, we performed a systematicsearch 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.
Coverage
The many facets of extragalactic radio surveys: towards new scientific challenges (EXTRA-RADSUR2015)
Volume
267
Start page
69
Conferenece
The many facets of extragalactic radio surveys: towards new scientific challenges (EXTRA-RADSUR2015)
Conferenece place
Bologna, Italy
Conferenece date
20-23 October, 2015
Uri
Url
Issn Identifier
1824-8039
Ads BibCode
2015fers.confE..69B
Rights
open.access
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