Information on Service 'LOFAR HETDEX Source Catalogue'

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The LOFAR Two-metre Sky Survey First Data Release contains images and catalogs that characterise the low-frequency radio emission in the region of the HETDEX Spring Field (right ascension 10h45m00s to15h30m00s and declination 45◦00′00′′ to 57◦00′00′′). A total of 365,694 radio sources are detected in a region covering 424 square degrees. The maps have a median sensitivity of 71 uJy/beam and a resolution of 6 arcsec. Optical counterparts for 71% of the radio sources have been identified and where possible photometric redshifts for these sources have been derived.

For a list of all services and tables belonging to this service's resource, see Information on resource 'LOFAR HETDEX Source Catalogue'

Service Documentation

Overview

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This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
MAXREC Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
RESPONSEFORMAT Output Format File format requested for output. N/A meta.code.mime
SR Search Radius Search radius deg N/A
VERB Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_2RXS_ID 2RXS_ID ID in 2RXS catalog N/A N/A
AllWISE AllWISE Name of the source in the AllWISE catalogue N/A meta.id
DC_Maj DC_Maj The FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec N/A
DC_Min DC_Min The FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec N/A
DC_PA DC_PA The position angle of the major axis of the source measured east of north, after de-convolution with the 6-arcsec LOFAR beam deg N/A
Deblended_from Deblended_from Name of PyBDSF multiple Gaussian component source from which this source was deblended N/A N/A
DEC Dec Position from PyBDSF or combination of PyBDSF components deg pos.eq.dec;meta.main
E_DC_Maj E_DC_Maj The 1-σ error on the FWHM of the deconvolved major axis of the source arcsec N/A
E_DC_Min E_DC_Min The 1-σ error on the FWHM of the deconvolved minor axis of the source arcsec N/A
E_DC_PA E_DC_PA The 1-σ error on the position angle of the deconvolved major axis of the source deg N/A
E_DEC error Dec Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.dec
E_Maj E_Maj The 1-σ error on the FWHM of the major axis of the source arcsec N/A
E_Min E_Min The 1-σ error on the FWHM of the minor axis of the source arcsec N/A
E_PA E_PA The 1-σ error on the position angle of the major axis of the source deg N/A
E_Peak_flux error Peak flux The 1-σ error on the peak flux density per beam of the source mJy/beam N/A
E_RA error RA Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.ra
E_Total_flux error Total flux The 1-σ on the total flux density of the source mJy N/A
EBV EBV E(B-V) galactic extinction for the source based on its position and Schlegel, Finkbeiner and Davis (1998) extinction maps - http://argonaut.skymaps.info. Fluxes and magnitudes in the catalog have already been corrected based on this value. N/A N/A
FApFlux FApFlux PanSTARRs y-band forced aperture photometry flux uJy N/A
FApFluxErr FApFluxErr PanSTARRs y-band forced aperture photometry flux error uJy N/A
FApMag FApMag PanSTARRs y-band forced aperture photometry magnitude mag N/A
FApMagErr FApMagErr PanSTARRs y-band forced aperture photometry magnitude error mag N/A
Flux Flux AllWISE W1 profile-fit photometry flux uJy N/A
FluxErr FluxErr AllWISE W1 profile-fit photometry flux error uJy N/A
ID_dec ID_dec Declination of optical identification deg pos.eq.dec
ID_flag ID_flag Flag indicating the origin of the optical identification. 0 - no ID possible (too large or otherwise difficult) 1 - identification (or alck thereof) from maximum likelihood analysis 2 - match to a bright galaxy (either 2MASX or SDSS) 3? - association and identification (or lack therof) from LGZ, second digit is further flag 31 - output from LGZ 32 - output from LGZ (too-zoomed-in) 4? - association and identification (or lack therof) through deblend workflow 41 - deblend following flowchart classification of m sources 42 - deblend following LG N/A N/A
ID_name ID_name PanSTARRs, AllWISE, 2MASX or SDSS name of optical identification N/A meta.id
ID_ra ID_ra Right ascension of optical identification deg pos.eq.ra
IRClass IRClass Bit-flag indicating WISE AGN Class based on Assef+2012 selection criteria. 1 - 90% Completeness criteria, 2 - 75% Completeness criteria, 4 - 75% Reliability criteria, 8 - 90% Reliability criteria N/A N/A
Isl_rms RMS noise The average background rms value of the island mJy/beam N/A
LGZ_Assoc LGZ_Assoc Number of sources in the LGZ association N/A N/A
LGZ_Assoc_Qual LGZ_Assoc_Qual LGZ association quality flag N/A N/A
LGZ_ID_Qual LGZ_ID_Qual LGZ identification quality flag N/A N/A
LGZ_PA LGZ_PA The position angle on the sky, measured east of north, of that largest diameter deg N/A
LGZ_Size LGZ_Size Length of the largest diameter of the convex hull around the set of component elliptical Gaussians arcsec N/A
LGZ_Width LGZ_Width Twice the maximum perpendicular distance of points on the convex hull to the largest diameter line arcsec N/A
Mag Mag AllWISE W1 profile-fit photometry magnitude mag N/A
MagErr MagErr AllWISE W1 profile-fit photometry magnitude error mag N/A
Major Major Axis The FWHM of the major axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec N/A
Masked_Fraction Masked_Fraction The fraction of the source that is in the CLEAN mask N/A N/A
Minor Minor Axis The FWHM of the minor axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec N/A
ML_LR ML_LR Likelihood ratio from maximum likelihood analysis N/A N/A
Mosaic_ID Mosaic The name of the HETDEX mosaic in which the FITS image can be found N/A N/A
mqcAGN mqcAGN Flag indicating source is included in Million Quasar Catalog compilation N/A N/A
objid objid The PanSTARRs object ID N/A meta.id
Optical_ID Optical_ID N/A N/A meta.id
PA PA The position angle of the major axis of the source measured east of north, INCLUDING convolution with the 6-arcsec LOFAR beam deg N/A
Peak_flux Peak flux The peak Stokes I flux density per beam of the source mJy/beam N/A
RA RA Position from PyBDSF or combination of PyBDSF components deg pos.eq.ra;meta.main
S_Code Gaus A code the defines the source structure in terms of the fitted Gaussian components: ’S’ indicates an isolated source that is fit with a single Gaussian; ‘C’ represents sources that are fit by a single Gaussian but are within an island of emission that also contains other sources; and ‘M’ is used for sources with are extended and fit with multiple Gaussians. N/A N/A
Source_Name ID The radio name of the source, automatically generated from RA and DEC in most cases N/A meta.id;meta.main
specAGN specAGN Flag indicating spectroscopically identified AGN N/A N/A
Total_flux Total flux The total, integrated Stokes I flux density of the source at the reference frequency mJy N/A
XMMSL2_ID XMMSL2_ID ID in XMMSL2 catalog N/A N/A
XrayClass XrayClass 2RXS or XMMSL2 X-ray source class: 1=AGN, 2=Galaxy/Star (based on criteria in Salvato+2017) N/A N/A

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
Source_Name ID The radio name of the source, automatically generated from RA and DEC in most cases N/A meta.id;meta.main 1
RA RA Position from PyBDSF or combination of PyBDSF components deg pos.eq.ra;meta.main 1
E_RA error RA Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.ra 1
DEC Dec Position from PyBDSF or combination of PyBDSF components deg pos.eq.dec;meta.main 1
E_DEC error Dec Estimated by PyBDSF. Only fitting uncertainties are included arcsec stat.error;pos.eq.dec 1
Peak_flux Peak flux The peak Stokes I flux density per beam of the source mJy/beam N/A 1
E_Peak_flux error Peak flux The 1-σ error on the peak flux density per beam of the source mJy/beam N/A 1
Total_flux Total flux The total, integrated Stokes I flux density of the source at the reference frequency mJy N/A 1
E_Total_flux error Total flux The 1-σ on the total flux density of the source mJy N/A 1
Major Major Axis The FWHM of the major axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec N/A 1
E_Maj E_Maj The 1-σ error on the FWHM of the major axis of the source arcsec N/A 1
Minor Minor Axis The FWHM of the minor axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam arcsec N/A 1
E_Min E_Min The 1-σ error on the FWHM of the minor axis of the source arcsec N/A 1
PA PA The position angle of the major axis of the source measured east of north, INCLUDING convolution with the 6-arcsec LOFAR beam deg N/A 1
E_PA E_PA The 1-σ error on the position angle of the major axis of the source deg N/A 1
DC_Maj DC_Maj The FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec N/A 1
E_DC_Maj E_DC_Maj The 1-σ error on the FWHM of the deconvolved major axis of the source arcsec N/A 1
DC_Min DC_Min The FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam arcsec N/A 1
E_DC_Min E_DC_Min The 1-σ error on the FWHM of the deconvolved minor axis of the source arcsec N/A 1
DC_PA DC_PA The position angle of the major axis of the source measured east of north, after de-convolution with the 6-arcsec LOFAR beam deg N/A 1
E_DC_PA E_DC_PA The 1-σ error on the position angle of the deconvolved major axis of the source deg N/A 1
Isl_rms RMS noise The average background rms value of the island mJy/beam N/A 1
S_Code Gaus A code the defines the source structure in terms of the fitted Gaussian components: ’S’ indicates an isolated source that is fit with a single Gaussian; ‘C’ represents sources that are fit by a single Gaussian but are within an island of emission that also contains other sources; and ‘M’ is used for sources with are extended and fit with multiple Gaussians. N/A N/A 1
Mosaic_ID Mosaic The name of the HETDEX mosaic in which the FITS image can be found N/A N/A 1
Masked_Fraction Masked_Fraction The fraction of the source that is in the CLEAN mask N/A N/A 1
Optical_ID Optical_ID N/A N/A meta.id 1
ID_flag ID_flag Flag indicating the origin of the optical identification. 0 - no ID possible (too large or otherwise difficult) 1 - identification (or alck thereof) from maximum likelihood analysis 2 - match to a bright galaxy (either 2MASX or SDSS) 3? - association and identification (or lack therof) from LGZ, second digit is further flag 31 - output from LGZ 32 - output from LGZ (too-zoomed-in) 4? - association and identification (or lack therof) through deblend workflow 41 - deblend following flowchart classification of m sources 42 - deblend following LG N/A N/A 1
ID_name ID_name PanSTARRs, AllWISE, 2MASX or SDSS name of optical identification N/A meta.id 1
ID_ra ID_ra Right ascension of optical identification deg pos.eq.ra 1
ID_dec ID_dec Declination of optical identification deg pos.eq.dec 1
ML_LR ML_LR Likelihood ratio from maximum likelihood analysis N/A N/A 1
LGZ_Size LGZ_Size Length of the largest diameter of the convex hull around the set of component elliptical Gaussians arcsec N/A 1
LGZ_Width LGZ_Width Twice the maximum perpendicular distance of points on the convex hull to the largest diameter line arcsec N/A 1
LGZ_PA LGZ_PA The position angle on the sky, measured east of north, of that largest diameter deg N/A 1
LGZ_Assoc LGZ_Assoc Number of sources in the LGZ association N/A N/A 1
LGZ_Assoc_Qual LGZ_Assoc_Qual LGZ association quality flag N/A N/A 1
LGZ_ID_Qual LGZ_ID_Qual LGZ identification quality flag N/A N/A 1
Deblended_from Deblended_from Name of PyBDSF multiple Gaussian component source from which this source was deblended N/A N/A 1
AllWISE AllWISE Name of the source in the AllWISE catalogue N/A meta.id 1
objid objid The PanSTARRs object ID N/A meta.id 1
specAGN specAGN Flag indicating spectroscopically identified AGN N/A N/A 1
mqcAGN mqcAGN Flag indicating source is included in Million Quasar Catalog compilation N/A N/A 1
XrayClass XrayClass 2RXS or XMMSL2 X-ray source class: 1=AGN, 2=Galaxy/Star (based on criteria in Salvato+2017) N/A N/A 1
_2RXS_ID 2RXS_ID ID in 2RXS catalog N/A N/A 1
XMMSL2_ID XMMSL2_ID ID in XMMSL2 catalog N/A N/A 1
IRClass IRClass Bit-flag indicating WISE AGN Class based on Assef+2012 selection criteria. 1 - 90% Completeness criteria, 2 - 75% Completeness criteria, 4 - 75% Reliability criteria, 8 - 90% Reliability criteria N/A N/A 1
EBV EBV E(B-V) galactic extinction for the source based on its position and Schlegel, Finkbeiner and Davis (1998) extinction maps - http://argonaut.skymaps.info. Fluxes and magnitudes in the catalog have already been corrected based on this value. N/A N/A 1
FApFlux FApFlux PanSTARRs y-band forced aperture photometry flux uJy N/A 20
FApFluxErr FApFluxErr PanSTARRs y-band forced aperture photometry flux error uJy N/A 20
FApMag FApMag PanSTARRs y-band forced aperture photometry magnitude mag N/A 20
FApMagErr FApMagErr PanSTARRs y-band forced aperture photometry magnitude error mag N/A 20
Flux Flux AllWISE W1 profile-fit photometry flux uJy N/A 20
FluxErr FluxErr AllWISE W1 profile-fit photometry flux error uJy N/A 20
Mag Mag AllWISE W1 profile-fit photometry magnitude mag N/A 20
MagErr MagErr AllWISE W1 profile-fit photometry magnitude error mag N/A 20

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