AEGIS20ID ivo://nasa.heasarc/aegis20id NASA/GSFC HEASARC Willner et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source Infrared 3.6 - 8.0 micron (µm) images of the Extended Groth Strip (EGS) yield plausible counterpart identifications for all but one of 510 radio sources in the AEGIS20 S(1.4 GHz) > 50 microJansky (µJy) sample (Ivison et al. 2007, ApJ, 660, L77, available at the HEASARC as the AEGIS20 database table). This is the first such deep sample that has been effectively 100% identified. Achieving the same identification rate at R band would require observations reaching R<sub>AB</sub> > 27. Spectroscopic redshifts are available for 46% of the sample and photometric redshifts for an additional 47%. Almost all of the sources with 3.6-um AB magnitudes brighter than 19 have spectroscopic redshifts z < 1.1, while fainter objects predominantly have photometric redshifts with 1 <~ z <~ 3. Unlike more powerful radio sources that are hosted by galaxies having large stellar masses within a relatively narrow range, the AEGIS20 counterparts have stellar masses spanning more than a factor of 10 at z ~ 1. The sources are roughly 10% - 15% starbursts at z <~ 0.5 and 20%-25% active galactic nuclei mostly at z > 1, with the remainder of uncertain nature. Throughout this study, magnitudes are in the AB system, and the notation [w] means the AB magnitude at wavelength w in um. Source distances are based on standard Lambda-CDM cosmology with H<sub>0</sub> = 71 km s<sup>-1</sup> Mpc<sup>-1</sup> and Omega<sub>M</sub> = 0.27. Practical calculation of luminosity distances was based on the program ANGSIX (Kayser et al. 1997, A&A, 318, 680). This table was created by the HEASARC in July 2013 based on the electronic versions of Tables 1, 3, 4, and 5 from the reference paper which were obtained from the ApJ web site. This is a service provided by NASA HEASARC . 2012ApJ...756...72W https://heasarc.gsfc.nasa.gov/W3Browse/all/aegis20id.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=aegis20id& GET text/xml 180 99999 true 214.49231 52.5263 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=aegis20id GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_aegis20id&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0166666666666667 Radio public aegis20id All-Wavelength Extended Groth Strip Int. Survey (AEGIS) 20-cm Fu source_number Sequential Identification Number for Each Radio Source in Catalog meta.id;src short nullable aegis20_name AEGIS20 Source Identifier char nullable int_flux_20_cm Integrated 20-cm Flux Density mJy phot.flux.density;em.radio.750-1500MHz double nullable int_flux_20_cm_error 1-Sigma Uncertainty in Integrated 20-cm Flux Density mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable counterpart_id Counterpart Index Identifier meta.id.cross char nullable name EGSIRAC Identifier; Barmby et al. 2008 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 redshift Redshift src.redshift double nullable irac_3p6_um_mag Spitzer/IRAC 3.6-Micron Band AB Magnitude mag phot.mag;em.IR.3-4um double nullable irac_3p6_um_mag_error Uncertainty in Spitzer/IRAC 3.6-Micron Band AB Magnitude mag stat.error;phot.mag;em.IR.3-4um double nullable irac_rainbow_offset Radial Offset from IRAC to Rainbow Position arcsec pos.angDistance;em.IR double nullable position_angle Position Angle degree pos.posAng double nullable irac_5p8_um_mag_error Uncertainty in Spitzer/IRAC 5.8-Micron Band AB Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable irac_radio_offset Radial Offset from IRAC to Radio Position arcsec pos.angDistance;em.radio.750-1500MHz;em.IR double nullable rband_irac_offset Offset from R-Band to IRAC Position of Counterpart arcsec pos.angDistance;em.opt.R;em.IR double nullable irac_5p8_um_mag Spitzer/IRAC 5.8-Micron Band AB Magnitude mag phot.mag;em.IR.4-8um double nullable rband_ra Right Ascension of R-Band Source degree pos.eq.ra double nullable irac_4p5_um_mag Spitzer/IRAC 4.5-Micron Band AB Magnitude mag phot.mag;em.IR.4-8um double nullable rmag_type Magnitude Type meta.code;phot.mag;em.opt.R short nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable irac_8p0_um_mag Spitzer/IRAC 8.0-Micron Band AB Magnitude mag phot.mag;em.IR.4-8um double nullable major_axis Major Axis arcsec phys.angSize.smajAxis double nullable ref_redshift Reference Code for Source of Redshift Value meta.ref;src.redshift short nullable irac_8p0_um_mag_error Uncertainty in Spitzer/IRAC 8.0-Micron Band AB Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable min_number_irac_images Minimum Number of Useful Images meta.number short nullable rband_dec Declination of R-Band Source degree pos.eq.dec double nullable rmag_error Uncertainty in R-Band AB Magnitude mag stat.error;phot.mag;em.opt.R double nullable flux_20_cm_error 1-Sigma Uncertainty in 20-cm Peak Flux Density mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable rmag R-Band AB Magnitude mag phot.mag;em.opt.R double nullable irac_4p5_um_mag_error Uncertainty in Spitzer/IRAC 4.5-Micron Band AB Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable minor_axis Minor Axis arcsec phys.angSize.sminAxis double nullable luminosity_3_ghz The 3-GHz Luminosity W/Hz phys.luminosity;em.radio.1500-3000MHz double nullable irac_mag_type Spitzer/IRAC Magnitude Type meta.code;phot.mag;em.IR short nullable flux_20_cm 20-cm Peak Flux Density mJy phot.flux.density;em.radio.750-1500MHz double nullable rainbow_irac_name Source Designation in Rainbow Database meta.id.cross char nullable irac_comments Additional Comments meta.note char 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