文章基本信息

标题：Deep images at metre-wavelengths
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作者：S.K. Sirothia ; D.J. Saikia ; D. Burgarella 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2010
卷号：2010
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We have been studying several elds at low radio frequencies, such as ELAIS-N1, GOODS-N/S and the AKARI deep eld, and making deep images at metre-wavelengths using the Giant Metrewave Radio Telescope (GMRT). In this paper we largely summarise the results of the observations of ELAIS-N1 at 325 MHz, and present new results on the ECDFS at 150 and 325 MHz. These elds have been studied extensively at different wave-bands using the most powerful groundbased and space telescopes. The ELAIS-N1 image with the GMRT has an rms noise of 40 mJy beam􀀀1 towards the phase centre, while for the ECDFS eld the rms noise values are 2.5 mJy beam􀀀1 and 75mJy beam􀀀1 at 150 and 325 MHz respectively. The ECDFS observations also show a attening of the source counts at 1 mJy at 325 MHz, consistent with the results reported earlier for the ELAIS-N1 eld. The sub-mJy sources show a larger scatter in their spectral indices which is possibly at least partly due to a population of both starburst galaxies and low-luminosity AGN. These deep observations with the GMRT have helped identify a signicant number of very steep-spectrum sources, which could be either relic sources or candidate high-redshift galaxies.