Abstract Details
| Name: Pratik Dabhade Affiliation: IUCAA Conference ID: ASI2018_601 Title : Giant Radio Galaxies from LOFAR Two Metre Sky Survey Authors and Co-Authors : Huub Rottgering(Leiden Observatory) Joydeep Bagchi(IUCAA) Shishir Sankhyayan( IISER Pune) Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : Giant Radio Galaxies (GRGs) are the single largest objects known in the Universe. Their sizes extend from 0.5 Mpc to ~5 Mpc. The ‘central engine’ is an accreting SMBH of mass 10^8 to 10^10 msun which is responsible for the ejection of the collimated, bipolar relativistic jets orthogonal to an accretion disc. GRGs are believed to be the last stop of radio galaxy evolution owing to their sizes. This helps in imposing constraints on evolutionary models of radio galaxies. GRGs can serve as outstanding probes of the IGM. GRGs can also transport enriched material from the host galaxy to large distances and pollute the IGM with non-thermal particles and magnetic fields. Low frequency surveys are ideal to search for new GRGs as the radio emission is least suppressed by spectral ageing effects in the extended radio lobes and is prone to detect more diffuse relic plasma from lobes of GRGs. We use the new LOFAR Two-metre Sky Survey (LoTSS) which is a deep 120-168 MHz imaging survey and which has a unprecedented sensitivity (~0.1 mJy) and resolution (~5â€). This makes it ideal for GRG (re)search. We have found confirmed 150 GRGs from the LoTSS, of which several are hosted by quasars with z >1. This is the biggest sample of GRGs unearthed from any survey of any frequency. Also, about 250 GRG candidates were also identified which most likely to be high (z>1) redshift galaxies. These candidates will be followed with the WEAVE-LOFAR program. This study will allow us to probe powerful high z radio sources and its evolution. We will present all these results in detail along with the future plan. |