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SUMMARY:From Young to Restarted: Investigating Peaked-Spectrum Radio AGN u
 sing LoTSS
DTSTART;VALUE=DATE-TIME:20261022T071500Z
DTEND;VALUE=DATE-TIME:20261022T081500Z
DTSTAMP;VALUE=DATE-TIME:20261110T161742Z
UID:indico-contribution-2273@events.ncbj.gov.pl
DESCRIPTION:Speakers: Anupama Mohanan ()\nPeaked-spectrum (PS) radio sourc
 es are often associated with young radio active galactic nuclei (AGN)\, re
 presenting an early stage of radio galaxy evolution. However\, some PS sou
 rces exhibit compact radio emission embedded within much larger\, extended
  radio structures\, suggesting that they may represent a new episode of je
 t activity in systems with a previous evolutionary history. Identifying su
 ch sources provides an opportunity to investigate the episodic nature of A
 GN activity and constrain the duty cycles of radio galaxies. \n\nIn this t
 alk\, I will present a systematic investigation of PS radio AGN using the 
 LOFAR Two-metre Sky Survey (LoTSS). First\, I will discuss our search for 
 extended radio emission around candidate gigahertz-peaked-spectrum (GPS) a
 nd megahertz-peaked-spectrum (MPS) sources from the literature using LoTSS
 . This study identified 30 candidate restarted radio galaxies\, including 
 systems with large-scale radio structures extending well beyond their comp
 act PS components. These sources provide a valuable sample for investigati
 ng the connection between compact radio activity and the long-term evoluti
 on of radio galaxies. Building on this work\, I will present an ongoing pr
 oject to establish a robust census of PS sources using LoTSS\, which cover
 s approximately 89% of the northern sky and contains 13.7 million radio so
 urces. By combining radio catalogues across multiple frequencies and apply
 ing systematic spectral-selection criteria\, we have identified approximat
 ely 12\,000 PS candidates. Redshifts have been assembled for around half o
 f the sample\, enabling further investigation of their physical properties
  and large-scale radio morphologies. Preliminary results also reveal exten
 ded radio emission associated with a significant fraction of these PS samp
 les. Together\, these studies provide a foundation for investigating\n the
  evolutionary diversity of PS radio AGN\, identifying promising restarted 
 candidates\, and developing a statistically robust sample for future popul
 ation studies.\n\nhttps://events.ncbj.gov.pl/event/509/contributions/2273/
LOCATION:NCBJ Room 207
URL:https://events.ncbj.gov.pl/event/509/contributions/2273/
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