GMRT detection of a New Wide-Angle Tail (WAT) radio source associated with the galaxy PGC 1519010 |
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Authors: | N G Kantharia M Das Gopal-Krishna |
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Institution: | (1) National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Post Bag 3, Ganeshkhind, Pune University Campus, Pune, 411 007, India;(2) Raman Research Institute, Sadashivnagar, Bangalore, 560 080, India |
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Abstract: | We report the serendipitous detection of a Wide-Angle Tail (WAT) radio galaxy at 240 and 610 MHz, using the Giant Metrewave
Radio Telescope (GMRT). This WAT is hosted by a cD galaxy PGC 1519010 whose photometric redshift given in the SDSS DR6 catalogue
is close to the spectroscopic redshifts (0.105, 0.106 and 0.107) of three galaxies found within 4′ of the cD. Using the SDSS
DR6, we have identified a total of 37 galaxies within 15′ of the cD, whose photometric redshifts are between 0.08 and 0.14.
This strongly suggests that the cD is associated with a group of galaxies whose conspicuous feature is a north-south chain
of galaxies (filament) extending to at least 2.6 Mpc. The ROSAT all-sky survey shows a faint, diffuse X-ray source in this direction, which probably marks the hot intracluster gas in the
potential well of this group.
We combine the radio structural information for this WAT with the galaxy clustering in that region to check its overall consistency
with the models of WAT formation. The bending of the jet before and after its disruption forming the radio plume, are found
to be correlated in this WAT, as seen from the contrasting morphological patterns on the two sides of the core. Probable constraints
imposed by this on the models of WAT formation are pointed out. We also briefly report on the other interesting radio sources
found in the proximity of the WAT. These include a highly asymmetric double radio source and an ultra-steep spectrum radio
source for which no optical counterpart is detected in the SDSS. |
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Keywords: | Radio galaxies cluster of galaxies ram pressure intracluster medium |
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