Information on Service 'LOFAR HETDEX Source Catalogue'

Further access options are discussed below

This service queries the catalog of radio sources from the LOFAR Two-metre Sky Survey First Data Release (LoTSS-DR1). This 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

You can access this service using:

static -- static (i.e. prepared) data or custom client-side code; probably used to access ancillary files here
form -- allows access via an HTML form
scs.xml -- a standard SCS interface as defined by the IVOA to access catalog-type data; SCS clients use https://vo.astron.nl/hetdex/hetdex/cone/scs.xml? to access the service

This service is published as follows:

Within the set(s) local with the renderer form

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):

Name	Table Head	Description	Unit	UCD
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.

Name	Table Head	Description	Unit	UCD
_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;meta.main
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;meta.main
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;meta.main
Optical_ID	Optical_ID	N/A	N/A	meta.id;meta.main
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.

Name	Table Head	Description	Unit	UCD	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;meta.main	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;meta.main	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;meta.main	1
objid	objid	The PanSTARRs object ID	N/A	meta.id;meta.main	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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