A deep ATCA 20 cm radio survey of theAKARIDeep Field South near the South Ecliptic Pole

Abstract

The results of a deep radio survey at 20 cm wavelength are reported for a region containing the AKARI Deep Field South (ADF-S) near the South Ecliptic Pole (SEP), using the Australia Telescope Compact Array (ATCA). The survey (hereafter referred to as the ATCA-ADFS survey) has 1σ detection limits ranging from 18.7 to 50 µJy beam −1 over an area of ∼1.1 deg 2 , and ∼2.5 deg 2 to lower sensitivity. The observations, data reduction and source count analysis are presented along with a description of the overall scientific objectives, and a catalogue containing 530 radio sources detected with a resolution of 6.2 × 4.9 arcsec. The derived differential source counts show a pronounced excess of sources fainter than ∼1 mJy, consistent with an emerging population of star-forming galaxies. Cross-correlating the radio with AKARI sources and archival data we find 95 cross-matches, with most galaxies having optical R-magnitudes in the range 18-24 mag, similar to that found in other optical deep field identifications, and 52 components lying within 1 arcsec of a radio position in at least one further catalogue (either IR or optical). We have reported redshifts for a sub-sample of our catalogue finding that they vary between galaxies in the local Universe and those having redshifts of up to 0.825. Associating the radio sources with the Spitzer catalogue at 24 µm, we find 173 matches within one Spitzer pixel, of which a small sample of the identifications

[Ultra] luminous infrared galaxies selected at 90μm in the AKARI deep field: a study of AGN types contributing to their infrared emission

“…In the present paper, new measurements, mainly from GALEX, Spitzer/MIPS sample (Rieke et al 2004, taken from public database and for a part of ADF-S sources, measured directly from images by ourselves), WISE (Wright et al 2010), and ATCA-ADFS survey (White et al 2012), as well as new spectroscopic data not included in our previous studies (Sedgwick et al 2011;Jones et al 2009), were added to create the extended version of our multi-wavelength catalog.…”

“…Eight of our sources have 20 cm counterparts from the ACTA-AKARI survey. Unfortunately, two of them are unresolved (according to White et al 2012, the ratio of the integrated flux density and peak flux density for unresolved sources is lower than 1.3). As for our SED fitting method, every additional model requires additional parameters.…”

Properties of star forming galaxies in AKARI Deep Field-South

“…The ADF-S field was also observed in other wavelength ranges, i.e., at millimeter and submillimeter wavelengths (Hatsukade et al 2011), radio wavelengths (White et al 2012), and mid-and far-infrared wavelengths (Clements et al 2011). Additionally, dedicated spectroscopic measurements of selected ADF-S sources were performed by Sedgwick et al (2011) in order to build the FIR luminosity function of local star-forming galaxies.…”

Local Group dSph radio survey with ATCA – I: observations and background sources

“…A criterium often adopted in the literature is to consider sources with Stot/S peak < 1.3 to be unresolved (White et al 2012). However, since we combine two different maps and the total flux density can come from the tapered image, this kind of analysis is somewhat misleading.…”