ATLAS2P3GH ivo://nasa.heasarc/atlas2p3gh NASA/GSFC HEASARC Zinn et al. 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Australia Telescope Large Area Survey (ATLAS) aims to image a 7 deg<sup>2</sup> region centered on the European Large Area ISO Survey - South 1 (ELAIS-S1) field and the Chandra Deep Field South (CDF-S) at 1.4 GHz with high sensitivity (up to sigma ~ 10 uJy) to study the evolution of star-forming galaxies (SFGs) and Active Galactic Nuclei (AGN) over a wide range of cosmic time. The main goal of the present work is to study the radio spectra of an unprecedentedly large sample of sources (~ 2000 observed, ~ 600 detected in both frequencies). This table contains the results from ancillary radio observations at a frequency of 2.3 GHz which were obtained with the Australia Telescope Compact Array (ATCA). It comprises the catalog of sources with measured 1.4 GHz to 2.3 GHz spectral indices (Table 2 in the reference paper), compiled in the framework of ATLAS. It comprises only such sources which have unambiguous detections at both 1.4 GHz and 2.3 GHz, so no upper or lower limits on the spectral index based on non-detections are included. The 2.3-GHz detection limit is 300 uJy (equivalent to 4.5 sigma in the ELAIS-S1 field and 4.0 sigma in the CDF-S). The authors compute spectral indices between 1.4 GHz and 2.3 GHz using matched-resolution images and investigate various properties of their source sample in their dependence on their spectral indices. The authors find the entire source sample to have a median spectral index of -0.74, in good agreement with both the canonical value of -0.7 for optically thin synchrotron radiation and other spectral index studies conducted by various groups. Regarding the radio spectral index Alpha as indicator for source type, they find only marginal correlations so that flat or inverted spectrum sources are usually powered by AGN and hence conclude that, at least for the faint population, the spectral index is not a strong discriminator. They investigate the z-Alpha relation for their source sample and find no such correlation between spectral index and redshift at all. The authors do find a significant correlation between redshift and radio to near-infrared flux ratio, making this a much stronger tracer of high-z radio sources. They also find no evidence for a dependence of the radio-IR correlation on spectral index. This table was created by the HEASARC in August 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/544/A38">CDS Catalog J/A+A/544/A38</a> file spix_pub.dat. This is a service provided by NASA HEASARC . 2012A&A...544A..38Z https://heasarc.gsfc.nasa.gov/W3Browse/all/atlas2p3gh.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=atlas2p3gh& GET text/xml 180 99999 true 9.313625 -44.597136 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=atlas2p3gh GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_atlas2p3gh&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public atlas2p3gh AT Large Area Survey (ATLAS) ELAIS-S1 & CDF-S 2.3-GHz Source Cat name Source Designation, [ZMN2012] F NNNCN meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable flux_2p3_ghz Integrated Flux Density at 2.3GHz mJy phot.flux.density;em.radio.1500-3000MHz double nullable flux_2p3_ghz_error Error in Integrated Flux Density at 2.3GHz mJy stat.error;phot.flux.density;em.radio.1500-3000MHz double nullable flux_1p4_ghz Integrated Flux Density at 1.4GHz in High Resolution Map mJy phot.flux.density;em.radio.750-1500MHz double nullable flux_1p4_ghz_error Error in Integrated Flux Density at 1.4GHz in High Resolution Map mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable spectral_index 1.4GHz (Low Resolution Map) to 2.3GHz Spectral Index spect.index;em.radio.750-1500MHz;em.radio.1500-3000MHz double nullable spectral_index_error Error in Spectral Index stat.error;spect.index;em.radio.750-1500MHz;em.radio.1500-3000MHz double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable field_id Flag [CE] Indicates Field: C=CDF-S or E=ELAIS-S1 meta.id;obs.field char nullable flux_1p4_ghz_low_error Error in Integrated Flux Density at 1.4GHz in Low Resolution Map mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable rms_2p3_ghz Local RMS Noise at 2.3GHz mJy stat.error;phot.flux.density;em.radio.1500-3000MHz double nullable rms_1p4_ghz_low Local RMS Noise at 1.4GHz in Low Resolution Map mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable spectral_class Spectral Classification meta.code;src.class char nullable redshift Spectroscopic Redshift src.redshift double nullable flux_1p4_ghz_low Integrated Flux Density at 1.4GHz in Low Resolution Map mJy phot.flux.density;em.radio.750-1500MHz double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable