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Paper: A Program to Search for Ultra-Steep Spectrum Radio Sources with the GMRT
Volume: 407, The Low-Frequency Radio Universe
Page: 43
Authors: Ishwara-Chandra, C.H.; Sirothia, S.K.; Pal, S.; Wadadekar, Y.
Abstract: It has been known for over two decades that the high redshift radio sources exhibit steep radio spectra and hence ultra-steep spectrum radio sources can be used as tracers of high-redshift radio galaxies. Here we present preliminary results from our program to search for ultra-steep spectrum radio sources at 150 MHz with GMRT, with an aim to detect high redshift radio galaxies. Deep observations at 150 MHz with GMRT have already been obtained for several well studied fields such as LBDSLynx, three of the DEEP2 fields, VIRMOS-VLT, VLA-COSMOS and GOODS-N. The present observations are more than 10 times deeper than the earlier search for ultrasteep spectrum radio sources using the catalogues at 327 and 1400 MHz. In addition, some of these fields are well studied at higher radio frequencies and at X-Ray, Optical and IR bands. Here we present results from the LBDS-Lynx field, which has been observed with GMRT at 150 MHz and also previously observed with WSRT (325 and 1412 MHz) and with VLA (1.4 and 5 GHz).
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