AGNSDSSXM2 ivo://nasa.heasarc/agnsdssxm2 NASA/GSFC HEASARC Ballo et al. 2026-09-11 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source X-ray emission from active galactic nuclei (AGN) is dominated by the accretion disk around a supermassive black hole. The radio luminosity, however, has not such a clear origin except in the most powerful sources where jets are evident. The origin (and even the very existence) of the local bi-modal distribution in radio-loudness is also a debated issue. By analyzing X-ray, optical and radio properties of a large sample of type 1 AGN and quasars (QSOs) up to z > 2, where the bulk of this population resides, the authors aim to explore the interplay between radio and X-ray emission in AGN, in order to further our knowledge on the origin of radio emission, and its relation to accretion. They analyze a large (~800 sources) sample of type 1 AGN and QSOs selected from the 2XMMi XMM-Newton X-ray source catalog, cross-correlated with the SDSS DR7 spectroscopic catalog, covering a redshift range from z ~ 0.3 to z ~ 2.3. Supermassive black hole masses are estimated from the Mg II emission line, bolometric luminosities from the X-ray data, and radio emission or upper limits from the FIRST catalog. Most of the sources accrete close to the Eddington limit and the distribution in radio-loudness does not appear to have a bi-modal behavior. This study confirms that radio-loud AGN are also X-ray loud, with an X-ray-to-optical ratio up to twice that of radio-quiet objects, even excluding the most extreme strongly jetted sources. By analyzing complementary radio-selected control samples, the authors find evidence that these conclusions are not an effect of the X-ray selection, but are likely a property of the dominant QSO population. The authors of this catalog conclude that their findings are best interpreted in a context where radio emission in AGN, with the exception of a minority of beamed sources, arises from very close to the accretion disk and is therefore heavily linked to X-ray emission. They also speculate that the radio-loud/radio-quiet dichotomy might either be an evolutionary effect that developed well after the QSO peak epoch, or an effect of incompleteness in small samples. Basic information and derived properties are presented for the sample of X-ray selected type 1 AGN (as well as for the 11 X-ray undetected type 1 AGN in the "control sample"): coordinates, redshift, X-ray and radio fluxes, optical magnitudes, from the SDSS, 2XMMi, and FIRST catalogs; continuum luminosities at 3000 Angstroms and in the X-ray band, black hole masses, bolometric luminosities, Eddington ratios; for the sources falling in the FIRST field, optical fluxes at 2500 and 4400 Angstroms, X-ray-to-optical index, radio classification, and the ratios between the radio and the UV, optical, and X-ray fluxes. This table was created by the HEASARC in October 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/545/A66">CDS Catalog J/A+A/545/A66</a> files table3.dat, table4.dat and table5.dat. This is a service provided by NASA HEASARC . 2012A&A...545A..66B https://heasarc.gsfc.nasa.gov/W3Browse/all/agnsdssxm2.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=agnsdssxm2& GET text/xml 180 99999 true 32.500916 -10.064916 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=agnsdssxm2 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_agnsdssxm2&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 Optical Radio X-ray public agnsdssxm2 Sloan Digital Sky Survey/XMM-Newton Type1 AGN X-Ray and Radio Pr name Source Designation meta.id;meta.main char nullable ra XMM-Newton Right Ascension degree pos.eq.ra;meta.main double nullable dec XMM-Newton Declination degree pos.eq.dec;meta.main double nullable fx_limit Limit Flag for X-Ray Flux meta.code;phot.flux;em.X-ray char nullable fx X-Ray Flux (0.2-12keV) erg/s/cm^2 phot.flux;em.X-ray double nullable fx_error X-Ray Flux Error (0.2-12keV) erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable imag SDSS i-Filter Magnitude mag phot.mag;em.opt.I double nullable redshift SDSS Redshift src.redshift double nullable redshift_error SDSS Redshift Error stat.error;src.redshift double nullable log_lx_limit Limit Flag for X-Ray Luminosity (2-10keV) meta.code;phys.luminosity;em.X-ray char nullable log_lx X-Ray Luminosity (2-10keV) log(erg/s) phys.luminosity;em.X-ray double nullable log_lx_error RMS Uncertainty in X-Ray Luminosity (2-10keV) log(erg/s) stat.error;phys.luminosity;em.X-ray 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 rx_radio_loud_error RMS Uncertainty in Radio-to-X-Ray Radioloudness stat.error;phot.flux;arith.ratio;em.radio;em.X-ray double nullable ru_radio_loud_error Radio-to-UV Radioloudness Error stat.error;phot.flux;arith.ratio;em.radio;em.UV double nullable alpha_ox_error RMS Uncertainty in alpha_ox stat.error;spect.index;em.opt;em.X-ray double nullable lim_ru_radio_loud_flag Flag [O] for Upper Limit to Radio-to-UV Radioloudness meta.code;phot.flux;arith.ratio;em.radio;em.UV char nullable rf_flux_6_cm_flag Flag [Ou] for Flux at 5GHz Rest Frame meta.code;phot.flux.density;em.radio.3-6GHz char nullable lim_ru_radio_loud_error RMS Uncertainty in Upper Limit to Radio-to-UV Radioloudness stat.error;phot.flux;arith.ratio;em.radio;em.UV double nullable sdss_id SDSS Source Identification Number meta.id.cross char nullable log_lx_ledd_limit Limit Flag for X-Ray/Eddington Luminosity Ratio meta.code;phys.luminosity;arith.ratio char nullable log_lx_ledd X-Ray/Eddington Luminosity Ratio phys.luminosity;arith.ratio double nullable log_bh_mass_flag Flag [Y] Indicates Black Hole Mass from Shen et al. (2011ApJS..194...45S) meta.code;phys.mass char nullable radio_class Radio Classification src.class char nullable log_rf_3000a_lum Luminosity at 3000-Angstrom Rest Frame log(erg/s/Angstrom) phys.luminosity;em.UV double nullable mg_ii_line_fwhm_flag Flag [Y] Indicates Value from Shen et al. (2011ApJS..194...45S) meta.code;spect.line.width;em.UV char nullable rx_radio_loud_flag Flag [Ou] for Radio-to-X-Ray Radioloudness meta.code;phot.flux;arith.ratio;em.radio;em.X-ray char nullable mg_ii_line_fwhm FWHM of the MgII Emission Line km/s spect.line.width;em.UV double nullable rf_2500a_flux_error RMS Uncertainty in Flux at 2500-Angstrom Rest Frame mJy stat.error;phot.flux.density;em.UV double nullable nh_gal Galactic Column Density cm^-2 phys.columnDensity double nullable gmag SDSS g-Filter Magnitude mag phot.mag;em.opt double nullable log_kx X-Ray (2-10keV) Bolometric Correction phot.mag.bc;em.X-ray double nullable lim_rf_flux_6_cm_error RMS Uncertainty in Upper Limit to Flux at 5GHz mJy stat.error;phot.flux.density;em.radio.3-6GHz double nullable lii SDSS Galactic Longitude degree pos.galactic.lon double nullable log_lbol_ledd_error RMS Uncertainty in Eddington Ratio stat.error;phys.luminosity;arith.ratio double nullable ro_radio_loud Radio-Optical Radioloudness phot.flux;arith.ratio;em.radio;em.opt double nullable log_lbol_ledd_limit Limit Flag for Eddington Ratio meta.code;phys.luminosity;arith.ratio char nullable sdss_dec SDSS Declination degree pos.eq.dec double nullable lim_rx_radio_loud Upper Limit for X-Ray Detected AGN Not Detected by FIRST phot.flux;arith.ratio;em.radio;em.X-ray double nullable log_bh_mass Logarithm of Mass of the Central Black Hole log(Solar_Mass) phys.mass double nullable log_kx_limit Limit Flag for X-Ray (2-10keV) Bolometric Correction meta.code;phot.mag.bc;em.X-ray char nullable alpha_ox_limit Limit Flag for alpha_ox meta.code;spect.index;em.opt;em.X-ray char nullable lim_ru_radio_loud Upper Limit to Radio-to-UV Radioloudness phot.flux;arith.ratio;em.radio;em.UV double nullable rx_radio_loud Radio-to-X-Ray Radioloudness phot.flux;arith.ratio;em.radio;em.X-ray double nullable alpha_ox X-Ray-to-Optical Spectral Index spect.index;em.opt;em.X-ray double nullable log_lbol_limit Limit Flag for the Bolometric Luminosity meta.code;phys.luminosity char nullable srcid_noxmm Arbitrary Identification for X-Ray Undetected Sources meta.id char nullable mg_ii_continuum_flux Continuum Below the MgII Line erg/s/cm^2/Angstrom phot.flux.density;em.UV double nullable rf_flux_6_cm_error RMS Uncertainty in for Flux at 5GHz Rest Frame mJy stat.error;phot.flux.density;em.radio.3-6GHz double nullable log_lx_ledd_error RMS Uncertainty in X-Ray/Eddington Luminosity Ratio stat.error;phys.luminosity;arith.ratio double nullable srcid_2xmmi XMM-Newton Source Identification Number meta.id int nullable lim_ro_radio_loud_error RMS Uncertainty in Upper Limit to Radio-Optical Radioloudness stat.error;phot.flux;arith.ratio;em.radio;em.opt double nullable rf_4400a_flux_error RMS Uncertainty in Flux at 4400-Angstrom Rest Frame mJy stat.error;phot.flux.density;em.opt.B double nullable log_lbol_ledd Eddington Ratio phys.luminosity;arith.ratio double nullable lim_rx_radio_loud_limit Limit Flag Indicates Lower Limit for Radio-Detected and X-Ray Undetected Sources meta.code;phot.flux;arith.ratio;em.radio;em.X-ray char nullable lim_rx_radio_loud_flag Flag [O] for Upper Limit meta.code;phot.flux;arith.ratio;em.radio;em.X-ray char nullable log_rf_3000a_lum_error Error in the Luminosity at 3000-Angstrom Rest Frame log(erg/s/Angstrom) stat.error;phys.luminosity;em.UV double nullable log_lbol Bolometric Luminosity log(erg/s) phys.luminosity double nullable sdss_ra SDSS Right Ascension degree pos.eq.ra double nullable ru_radio_loud_flag [Ou] Flag on meta.code;phot.flux;arith.ratio;em.radio;em.UV char nullable ro_radio_loud_flag Flag [Ou] for Radio-Optical Radioloudness meta.code;phot.flux;arith.ratio;em.radio;em.opt char nullable rf_2500a_flux Flux at 2500-Angstrom Rest Frame mJy phot.flux.density;em.UV double nullable flux_20_cm FIRST (Cat. VIII/71) Integrated Radio Flux at 1.5GHz mJy phot.flux.density;em.radio.750-1500MHz double nullable log_lbol_error RMS Uncertainty in Bolometric Luminosity log(erg/s) stat.error;phys.luminosity double nullable rf_4400a_flux Flux at 4400-Angstrom Rest Frame mJy phot.flux.density;em.opt.B double nullable log_kx_error RMS Uncertainty in X-Ray (2-10keV) Bolometric Correction stat.error;phot.mag.bc;em.X-ray double nullable ru_radio_loud Radio-to-UV Radioloudness phot.flux;arith.ratio;em.radio;em.UV double nullable mg_ii_line_fwhm_error MgII FWHM Error km/s stat.error;spect.line.width;em.UV double nullable lim_ro_radio_loud Upper Limit to Radio-Optical Radioloudness phot.flux;arith.ratio;em.radio;em.opt double nullable ro_radio_loud_error Radio-Optical Radioloudness Error stat.error;phot.flux;arith.ratio;em.radio;em.opt double nullable mg_ii_line_sigma Standard Deviation of MgII Line Angstrom spect.line.width;em.UV double nullable rmag SDSS r-Filter Magnitude mag phot.mag;em.opt.R double nullable lim_rf_flux_6_cm Upper Limit to Flux at 5GHz mJy phot.flux.density;em.radio.3-6GHz double nullable lim_ro_radio_loud_flag Flag [O] for Upper Limit to Radio-Optical Radioloudness meta.code;phot.flux;arith.ratio;em.radio;em.opt char nullable lim_rx_radio_loud_error RMS Uncertainty in Upper Limit stat.error;phot.flux;arith.ratio;em.radio;em.X-ray double nullable lim_rf_flux_6_cm_flag Flag [O] on Upper Limit to Flux at 5GHz meta.code;phot.flux.density;em.radio.3-6GHz char nullable flux_20_cm_error Error in Integrated Radio Flux at 1.5GHz mJy stat.error;phot.flux.density;em.radio.750-1500MHz double nullable mg_ii_line_sigma_error Error in Standard Deviation of MgII Line Angstrom stat.error;spect.line.width;em.UV double nullable log_rf_3000a_lum_flag Flag [Y] Indicates Value from Shen et al. (2011ApJS..194...45S) meta.code;phys.luminosity;em.UV char nullable bii SDSS Galactic Latitude degree pos.galactic.lat double nullable rf_flux_6_cm Flux at 5GHz Rest Frame mJy phot.flux.density;em.radio.3-6GHz double nullable log_bh_mass_error Error in the Logarithm of Mass of the Central Black Hole log(Solar_Mass) stat.error;phys.mass double nullable flux_20_cm_flag Flag [Ou] When No Radio Flux Value meta.code;phot.flux.density;em.radio.750-1500MHz char nullable