325-MHz Observations of the ELAIS-N1 Field

Details 325-MHz Observations of the ELAIS-N1 Field 325-MHz Observations of the ELAIS-N1 Field

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..407...27s&link_type=abstract

The Low-Frequency Radio Universe ASP Conference Series, Vol. 407, proceedings of the conference held 8-12 December 2008, at Nati

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present observations of the European Large-Area ISO Survey-North 1 (ELAIS-N1) at 325 MHz using the GMRT, with the ultimate objective of identifying active galactic nuclei and starburst galaxies and examining their evolution with cosmic epoch. After combining the data from two different days we have achieved a median rms noise of ≈ μJy beam-1, which is the lowest that has been achieved at this frequency. We detect 1286 sources with a total flux density above ≈ μJy. We use our deep radio image to identify very steep spectrum sources which are likely to be either relic sources or high-redshift objects as well as inverted-spectra objects which could be Giga-Hertz Peaked Spectrum objects. We present the source counts, and report the possibility of a flattening in the normalized differential counts at low flux densities which has so far been reported at higher radio frequencies.

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