ACTEGSRCAT ivo://nasa.heasarc/actegsrcat NASA/GSFC HEASARC Marriage et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a list of extragalactic radio sources detected in a 455 square-degree map of the southern sky made at a frequency of 148 GHz from the Atacama Cosmology Telescope (ACT) 2008 observing season. This catalog has 157 sources with flux densities spanning two orders of magnitude from 15 to 1500 mJy. Comparison to other catalogs shows that 98% of the ACT detections correspond to sources detected at lower radio frequencies. Three of the sources appear to be associated with the brightest cluster galaxies of low redshift X-ray selected galaxy clusters. Estimates of the radio to mm-wave spectral indices and differential counts of the sources further bolster the hypothesis that they are nearly all radio sources, and that their emission is not dominated by re-emission from warm dust. In a bright (>50 mJy) 148 GHz-selected sample with complete cross-identifications from the Australia Telescope 20-GHz survey, the authors of the study observe an average steepening of the spectra between 5, 20, and 148 GHz with median spectral indices of alpha<sub>5-20</sub> = -0.07 +/- 0.06, alpha<sub>20-148</sub> = -0.39 +/- 0.04, and alpha<sub>5-148</sub> = -0.20 +/- 0.03. When the measured spectral indices are taken into account, the 148-GHz differential source counts are consistent with previous measurements at 30 GHz in the context of a source count model dominated by flat spectrum radio sources. Extrapolating with an appropriately rescaled model for the radio source counts, the Poisson contribution to the spatial power spectrum from synchrotron-dominated sources with flux density less than 20 mJy is C<sub>Sync</sub> = (2.8 +/- 0.3) x 10<sup>-6</sup> microKelvin<sup>2</sup>. This table was created by the HEASARC in January 2011 based on an electronic version of Table A1 from the paper (the Point Source Catalog) which was obtained from the LAMBDA website at <a href="http://lambda.gsfc.nasa.gov/product/suborbit/act_prod_table.cfm">http://lambda.gsfc.nasa.gov/product/suborbit/act_prod_table.cfm</a> This is a service provided by NASA HEASARC . 2011ApJ...731..100M https://heasarc.gsfc.nasa.gov/W3Browse/all/actegsrcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=actegsrcat& GET text/xml 180 99999 true 63.195833333333 -56.012222222222 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=actegsrcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_actegsrcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GROUND-BASED 0.0833333333333333 Radio public actegsrcat Atacama Cosmology Telescope 2008 Survey 148-GHz Extragalactic So name Source Designation meta.id;meta.main char nullable at20g_name AT20G Identification (Murphy et al.2010MNRAS.402.2403M) meta.id.assoc char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable meas_flux_148_ghz Measured 148-GHz Flux Density (mJy) mJy phot.flux.density;em.mm.100-200GHz double nullable flux_148_ghz Deboosted 148-GHz Flux Density (mJy) mJy phot.flux.density;em.mm.100-200GHz 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 snr 148-GHz Signal-to-Noise Ratio stat.snr;phot.flux.density;em.mm.100-200GHz double nullable flux_148_ghz_pos_err Positive Error in Deboosted Flux Density (mJy) mJy stat.error;phot.flux.density;em.mm.100-200GHz double nullable bii Galactic Latitude degree pos.galactic.lat double nullable flux_148_ghz_neg_err Negative Error in Deboosted Flux Density (mJy) mJy stat.error;phot.flux.density;em.mm.100-200GHz double nullable lii Galactic Longitude degree pos.galactic.lon double nullable