AGNSDSSXM2 - Sloan Digital Sky Survey/XMM-Newton Type1 AGN X-Ray and Radio Properties Catalog

Overview

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.

Catalog Bibcode

2012A&A...545A..66B

References

Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3.
     Ballo L., Heras F.J.H., Barcons X., Carrera F.J.
    <Astron. Astrophys. 545, A66 (2012)>
    =2012A&A...545A..66B      (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in October 2012 based on CDS Catalog J/A+A/545/A66 files table3.dat, table4.dat and table5.dat.

Parameters

Srcid_2xmmi
The XMM-Newton Serendipitous Source Catalog incremental 2nd release (2XMMi) source identification number for the (852) X-ray detected sources.

Srcid_Noxmm
For the 11 X-ray-undetected sources, this is an arbitrary identification number, viz., 01X to 11X.

Name
The HEASARC-constructed CDS-style source designation for the type 1 AGN, using the prefix of '[BHB2012]' for Ballo, Heras, Barcons (2012) and the srcid_2xmmi identification (for the 852 X-ray-detected sources) or the srcid_noxmm (for the 11 X-ray-undetected sources), e.g., '[BHB2012] 100067', or '[BHB2012] 9X', respectively.

RA
The Right Ascension of the XMM-Newton source position in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-6 degrees (0.0036 arcseconds) in the original table.

Dec
The Declination of the XMM-Newton source position in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-6 degrees (0.0036 arcseconds) in the original table.

LII
The Galactic Longitude of the XMM-Newton source position.

BII
The Galactic Latitude of the XMM-Newton source position.

Fx_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Fx
The XMM-Newton EPIC pn flux of the type 1 AGN between 0.2 and 12 keV (XMM-Newton Band 8) of the source, in erg cm^-2 s^-1, specifically the value of the xmm_pn_8_flux parameter in the 2XMMi Catalog, or, for the X-ray-undetected sources, the upper limit to this quantity from FLIX.

Fx_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Redshift
The redshift for the SDSS counterpart of the type 1 AGN.

Redshift_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

SDSS_ID
The unique spectroscopic identification number for the SDSS counterpart of the type 1 AGN.

SDSS_RA
The Right Ascension of the SDSS source position in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-6 degrees (0.0036 arcseconds) in the original table.

SDSS_Dec
The Declination of the SDSS source position in the selected equinox. This was given in J2000.0 coordinates to a precision of 10^-6 degrees (0.0036 arcseconds) in the original table.

Gmag
The SDSS g-filter magnitude of the type 1 AGN.

Rmag
The SDSS r-filter magnitude of the type 1 AGN.

Imag
The SDSS i-filter magnitude of the type 1 AGN.

Mg_II_Line_Sigma
The standard deviation of the Gaussian fitted to the Mg II 2799 Angstrom emission line of the type 1 AGN, in Angstroms.

Mg_II_Line_Sigma_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Mg_II_Continuum_Flux
The monochromatic continuum flux of the type 1 AGN at 2799 Angstroms beneath the Mg II emission line, in erg cm^-2 s^-1 A^-1.

Flux_20_cm
The FIRST Catalog integrated radio flux density of the type 1 AGN at 1.5 GHz (observed frame), in mJy.

Flux_20_cm_Flag
This flag parameter gives the reason why no 20-cm FIRST flux density is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST, while 'u' means the object was in a region of the sky covered by FIRST, but was undetected.

Flux_20_cm_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

NH_Gal
The Galactic column density in the direction of the type 1 AGN from Kalberla et al. (2005, A&A, 440, 775), in H atoms cm^-2.

Mg_II_Line_FWHM_Flag
This flag parameter is set to 'Y' to indicate that the value of the Mg II 2799 Angstrom emission line FWHM is taken from the SDSS DR7, while, if set to ' ', it is taken from Shen et al. (2011, ApJS, 194, 45).

Mg_II_Line_FWHM
The full-width at half-maximum (FWHM) of the Mg II 2799 Angstrom emission line in the type 1 AGN, in km s^-1.

Mg_II_Line_FWHM_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_RF_3000a_Lum_Flag
This flag parameter is set to 'Y' to indicate that the value of the monochromatic continuum luminosity at 3000 Angstroms in the rest frame has been recovered as described in Section 3 of the reference paper, while, if set to ' ', it is taken from Shen et al. (2011, ApJS, 194, 45).

Log_RF_3000a_Lum
The logarithm of the monochromatic continuum luminosity of the type 1 AGN at 3000 Angstroms in the rest frame, in erg s^-1 A^-1.

Log_RF_3000a_Lum_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_BH_Mass_Flag
This flag parameter is set to 'Y' to indicate that the value of the central black hole mass in the type 1 AGN has been computed using equation (1) of the reference paper, while, if set to ' ', it is taken from Shen et al. (2011, ApJS, 194, 45).

Log_BH_Mass
The logarithm of the mass of the central black hole in the type 1 AGN, in solar masses.

Log_BH_Mass_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_Lx_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Log_Lx
The logarithm of the hard X-ray luminosity L_X of the type 1 AGN in the 2 - 10 keV band, in erg s^-1, recovered as described in Section 3 of the reference paper.

Log_Lx_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_Lx_Ledd_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Log_Lx_Ledd
The logarithmic ratio of the hard X-ray luminosity L_X of the type 1 AGN in the 2 - 10 keV band to the Eddington luminosity L_Edd of its central black hole, where L_Edd = 1.3 x 10³⁸ (M_BH/M_Sun) erg s^-1.

Log_Lx_Ledd_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_Kx_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Log_Kx
The logarithm of the luminosity-dependent X-ray (2-10 keV) bolometric correction, k_X = L_bol/L_X, calculated using equation (2) of the reference paper based on Marconi et al. (2004, MNRAS, 351, 169).

Log_Kx_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_Lbol_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Log_Lbol
The logarithm of the bolometric luminosity of the type 1 AGN, in erg s^-1, recovered as described in Section 3 of the reference paper.

Log_Lbol_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Log_Lbol_Ledd_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Log_Lbol_Ledd
The Eddington ratio, Lambda = L_bol/L_Edd, i.e., the ratio of the bolometric and Eddington luminosities, for the type 1 AGN.

Log_Lbol_Ledd_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

RF_2500a_Flux
The monochromatic optical continuum flux of the type 1 AGN at 2500 Angstroms in the rest frame of the type 1 AGN, in mJy, recovered as described in Sections 3 and 4 of the reference paper.

RF_2500a_Flux_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Alpha_Ox_Limit
This flag parameter is set to '<' if the corresponding parameter value is an upper limit.

Alpha_Ox
The X-ray-to-optical spectral index of the type 1 AGN, alpha_ox = log (F_2keV/F_2500A)/log(nu_2keV/nu_2500A).

Alpha_Ox_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

RF_4400a_Flux
The monochromatic optical continuum flux of the type 1 AGN at 4400 Angstroms in the rest frame of the type 1 AGN, in mJy, recovered as described in Sections 3 and 4.2 of the reference paper. No value is given for those sources lacking an H-beta line in their spectra.

RF_4400a_Flux_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter. No value is given for those sources lacking an H-beta line in their spectra.

RF_Flux_6_cm
The monochromatic radio flux density of the type 1 AGN at 5 GHz in the rest frame, in mJy, recovered from the integrated flux density at 1.5 GHz by assuming a power-law spectrum F_nu ~ nu^-alpha, where alpha = 0.5, as described in Section 4 of the reference paper.

RF_Flux_6_cm_Flag
This flag parameter gives the reason why no rf 6-cm flux density is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST, while 'u' means the object was in a region of the sky covered by FIRST, but was undetected.

RF_Flux_6_cm_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Lim_RF_Flux_6_cm
For sources not detected by FIRST, the upper limit to the monochromatic radio flux at 5 GHz (rest frame), in mJy, calculated from the 1 mJy flux limit at 1.5 GHz of the FIRST survey, assuming the same spectral shape as for the , viz., a power-law spectrum F_nu ~ nu^-alpha, where alpha = 0.5,

Lim_RF_Flux_6_cm_Flag
This flag parameter gives the reason why no limiting rf 6-cm flux density is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST.

Lim_RF_Flux_6_cm_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Ru_Radio_Loud
The radio-to-UV radio loudness parameter value for the type 1 AGN, defined as the ratio between the radio flux at 5 GHz and the optical flux at 2500 Angstroms, both in the rest frame.

Ru_Radio_Loud_Flag
This flag parameter gives the reason why no radio-to-UV radio loudness parameter value is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST, while 'u' means the object was in a region of the sky covered by FIRST, but was undetected.

Ru_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Lim_Ru_Radio_Loud
For sources not detected by FIRST, the upper limit to the radio-to-UV radio loudness parameter, calculated from the limit to the radio flux at 5 GHz and the optical flux at 2500 Angstroms, both in the rest frame.

Lim_Ru_Radio_Loud_Flag
This flag parameter gives the reason why no limiting radio-to-UV radio loudness parameter is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST.

Lim_Ru_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Radio_Class
The radio classification of the type 1 AGN, coded as follows:

     RL   = radio-loud;
     dRI  = detected radio-intermediate;
     ndRI = non-detected with 1 < lim_ru_radio_loud <= 10;
     RQ   = radio-quiet;
     NC   = non-classified.

RO_Radio_Loud
The radio-to-optical radio loudness parameter value for the type 1 AGN, defined as the ratio between the radio flux at 5 GHz and the optical flux at 4400 Angstroms, both in the rest frame.

RO_Radio_Loud_Flag
This flag parameter gives the reason why no radio-to-optical radio loudness parameter value is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST, while 'u' means the object was in a region of the sky covered by FIRST, but was undetected.

RO_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Lim_Ro_Radio_Loud
For sources not detected by FIRST, the upper limit to the radio-to-optical radio loudness parameter, calculated from the limit to the radio flux at 5 GHz and the optical flux at 4400 Angstroms, both in the rest frame.

Lim_Ro_Radio_Loud_Flag
This flag parameter gives the reason why no limiting radio-to-optical radio loudness parameter is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST.

Lim_Ro_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Rx_Radio_Loud
The radio-to-X-ray radio loudness parameter value for the type 1 AGN, defined as the ratio between the radio luminosity at 5 GHz and the X-ray luminosity in the 2 - 10 keV energy range.

Rx_Radio_Loud_Flag
This flag parameter gives the reason why no radio-to-X-ray radio loudness parameter value is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST, while 'u' means the object was in a region of the sky covered by FIRST, but was undetected.

Rx_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Lim_Rx_Radio_Loud_Limit
This flag parameter is set to '>' if the corresponding parameter value is a lower limit.

Lim_Rx_Radio_Loud
The limit to the radio-to-X-ray radio loudness parameter, calculated from the limit to the radio luminosity at 5 GHz and the X-ray luminosity in the 2 - 10 keV energy range. Note that, for the X-ray detected AGN not detected by FIRST, it is an upper limit, while for the X-ray-undetected and radio-detected sources, it is a lower limit.

Lim_Rx_Radio_Loud_Flag
This flag parameter gives the reason why no limiting radio-to-X-ray radio loudness parameter is listed for the type 1 AGN: 'O' means that the object was in a region of the sky not covered by FIRST.

Lim_Rx_Radio_Loud_Error
The uncertainty in the corresponding parameter value for the source, in the same units as the latter.

Contact Person

Questions regarding the AGNSDSSXM2 database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:24:10 EDT