Information on Service 'LoTSS-DR3 Gaussian catalog cone search'

Further access options are discussed below

In this data release from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 88% of the northern sky. The individual pointing images (at 6'' and 20'' resolution) were derived from 12,950 hrs (18.6 PB) of LOFAR High Band Antenna data which were processed through fully automated direction-independent and direction-dependent calibration pipelines that correct for instrumental effects as well as spatially and temporally varying ionospheric distortions. The Stokes I images were then combined, accounting for the rms noise level and telescope beam, to form the final Stokes I mosaic images at 6'' and 20'' resolution, with a central frequency of 144MHz. From the 6'' resolution Stokes mosaics we derived a catalogue of 13,664,379 radio sources (consisting of 16,943,656 Gaussian components), the majority of which have never been detected at radio wavelengths before. These mosaics have a median rms sensitivity of 92 μJy/beam; a random and systematic flux density scale accuracy of approximately 6% and 2%, respectively; an astrometric accuracy of 0.24''; and we estimate that we detect more than 95% of sources with integrated flux densities exceeding nine times the local root mean square noise. To enable thorough scientific exploitation of this unique dataset, we have published two sub-collections. The first contains all the Stokes I mosaic products described above. The second contains the individual pointing products, including calibrated uv data (measurement sets and direction-dependent calibration solutions) to allow for re-imaging or post-processing; Stokes I images at 6' ' and 20'' resolution (with associated scaling factors required to reproduce the mosaic images); Stokes V images at 6'' resolution for each observing epoch; and Stokes Q and U image cubes at 20'' and 4' resolution. This service queries the Stokes I continuum mosaic gaussian component catalogue.

For a list of all services and tables belonging to this service's resource, see Information on resource 'lotss_dr3/q'

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/lotss_dr3/q/gaus_cone/scs.xml? to access the service

This service is published as follows:

Within the set(s) local with the renderer form
Within the set(s) ivo_managed with the renderer scs.xml
Within the set(s) ivo_managed with the renderer tap

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

Other services provided on the underlying data include:

Spatial Coverage

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
DC_Maj	DC_Maj	The FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize
DC_Min	DC_Min	The FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize
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	pos.posang
DEC	Dec	Position from PyBDSF or combination of PyBDSF components	deg	pos.eq.dec;meta.main
E_DC_Maj	E_DC_Maj	The 1-sigma error on the FWHM of the deconvolved major axis of the source	arcsec	stat.error;phys.angsize
E_DC_Min	E_DC_Min	The 1-sigma error on the FWHM of the deconvolved minor axis of the source	arcsec	stat.error;phys.angsize
E_DC_PA	E_DC_PA	The 1-sigma error on the position angle of the deconvolved major axis of the source	deg	stat.error;pos.posang
E_DEC	error Dec	Estimated by PyBDSF. Only fitting uncertainties are included	arcsec	stat.error;pos.eq.dec
E_Isl_Total_flux	Error island total flux	The 1-sigma error on the integrated Stokes I flux density of the island	mJy	stat.error;phot.flux.density;em.radio
E_Maj	E_Maj	The 1-sigma error on the FWHM of the major axis of the source	arcsec	stat.error;phys.angsize
E_Min	E_Min	The 1-sigma error on the FWHM of the minor axis of the source	arcsec	stat.error;phys.angsize
E_PA	E_PA	The 1-sigma error on the position angle of the major axis of the source	deg	stat.error;pos.posang
E_Peak_flux	Error peak flux	The 1-sigma error on the peak flux density per beam of the source	mJy/beam	stat.error;phot.flux.density;em.radio
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-sigma error on the total flux density of the source	mJy	stat.error;phot.flux.density;em.radio
E_Xposn	Error X position	Error in X image coordinate of the source	pix	stat.error;pos.cartesian.x
E_Yposn	Error Y position	Error in Y image coordinate of the source	pix	stat.error;pos.cartesian.y
Gaus_id	Gaussian ID	ID of the fitted Gaussian.	N/A	meta.id
HEALPIX	Mosaic	The name of the mosaic in which the FITS image can be found	N/A	meta.id;obs.image
Isl_rms	RMS noise	The average background rms value of the island	mJy/beam	instr.det.noise
Isl_Total_flux	Island total flux	The total, integrated Stokes I flux density of the island	mJy	phot.flux.density;em.radio
Majax	Major axis	The FWHM of the major axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize
Minax	Minor axis	The FWHM of the minor axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize
mosaic_url	Mosaic_url	DataLink to the corresponding mosaic	N/A	meta.id;obs.image
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	pos.posang
Peak_flux	Peak flux	The peak Stokes I flux density per beam of the source	mJy/beam	phot.flux.density;em.radio
RA	RA	Position from PyBDSF or combination of PyBDSF components	deg	pos.eq.ra;meta.main
Resolution	Resolution	The angular resolution of the mosaic image	arcsec	pos.angResolution;phys.angSize
S_Code	Morphological code	A code that defines the source structure 'S' for single Gaussian, 'M' for multiple Gaussian, 'C' = a single-Gaussian source in an island with other sources	N/A	meta.code;src.morph
Source_Name	ID	The radio name of the source, automatically generated from RA and DEC in most cases	N/A	meta.id;meta.main
Total_flux	Total flux	The total, integrated Stokes I flux density of the source at the reference frequency	mJy	phot.flux.density;em.radio
Wave_id	Wavelet ID	Wavelet scale from which the source was extracted	N/A	meta.id
Wave_Isl_mean	Wavelet mean	The average background mean value of the island	Jy/beam	instr.background;stat.mean
Wave_Isl_rms	Wavelet RMS noise	The average background rms value of the island in the wavelet	Jy/beam	instr.background;stat.rms
Xposn	X position	X image coordinate of the source	pix	pos.cartesian.x
Yposn	Y position	Y image coordinate of the source	pix	pos.cartesian.y

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
Total_flux	Total flux	The total, integrated Stokes I flux density of the source at the reference frequency	mJy	phot.flux.density;em.radio	1
E_Total_flux	Error total flux	The 1-sigma error on the total flux density of the source	mJy	stat.error;phot.flux.density;em.radio	1
Peak_flux	Peak flux	The peak Stokes I flux density per beam of the source	mJy/beam	phot.flux.density;em.radio	1
E_Peak_flux	Error peak flux	The 1-sigma error on the peak flux density per beam of the source	mJy/beam	stat.error;phot.flux.density;em.radio	1
Majax	Major axis	The FWHM of the major axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize	1
E_Maj	E_Maj	The 1-sigma error on the FWHM of the major axis of the source	arcsec	stat.error;phys.angsize	1
Minax	Minor axis	The FWHM of the minor axis of the source, INCLUDING convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize	1
E_Min	E_Min	The 1-sigma error on the FWHM of the minor axis of the source	arcsec	stat.error;phys.angsize	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	pos.posang	1
E_PA	E_PA	The 1-sigma error on the position angle of the major axis of the source	deg	stat.error;pos.posang	1
DC_Maj	DC_Maj	The FWHM of the major axis of the source, after de-convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize	1
E_DC_Maj	E_DC_Maj	The 1-sigma error on the FWHM of the deconvolved major axis of the source	arcsec	stat.error;phys.angsize	1
DC_Min	DC_Min	The FWHM of the minor axis of the source, after de-convolution with the 6-arcsec LOFAR beam	arcsec	phys.angsize	1
E_DC_Min	E_DC_Min	The 1-sigma error on the FWHM of the deconvolved minor axis of the source	arcsec	stat.error;phys.angsize	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	pos.posang	1
E_DC_PA	E_DC_PA	The 1-sigma error on the position angle of the deconvolved major axis of the source	deg	stat.error;pos.posang	1
Isl_Total_flux	Island total flux	The total, integrated Stokes I flux density of the island	mJy	phot.flux.density;em.radio	1
E_Isl_Total_flux	Error island total flux	The 1-sigma error on the integrated Stokes I flux density of the island	mJy	stat.error;phot.flux.density;em.radio	1
Isl_rms	RMS noise	The average background rms value of the island	mJy/beam	instr.det.noise	1
S_Code	Morphological code	A code that defines the source structure 'S' for single Gaussian, 'M' for multiple Gaussian, 'C' = a single-Gaussian source in an island with other sources	N/A	meta.code;src.morph	1
HEALPIX	Mosaic	The name of the mosaic in which the FITS image can be found	N/A	meta.id;obs.image	1
Resolution	Resolution	The angular resolution of the mosaic image	arcsec	pos.angResolution;phys.angSize	1
mosaic_url	Mosaic_url	DataLink to the corresponding mosaic	N/A	meta.id;obs.image	1
Gaus_id	Gaussian ID	ID of the fitted Gaussian.	N/A	meta.id	1
Wave_id	Wavelet ID	Wavelet scale from which the source was extracted	N/A	meta.id	1
Xposn	X position	X image coordinate of the source	pix	pos.cartesian.x	1
E_Xposn	Error X position	Error in X image coordinate of the source	pix	stat.error;pos.cartesian.x	1
Yposn	Y position	Y image coordinate of the source	pix	pos.cartesian.y	1
E_Yposn	Error Y position	Error in Y image coordinate of the source	pix	stat.error;pos.cartesian.y	1
Wave_Isl_rms	Wavelet RMS noise	The average background rms value of the island in the wavelet	Jy/beam	instr.background;stat.rms	1
Wave_Isl_mean	Wavelet mean	The average background mean value of the island	Jy/beam	instr.background;stat.mean	1

Copyright, License, Acknowledgements

LoTSS Data Release 3 is licensed under the Creative Commons Attribution Share-Alike 3.0 License

VOResource XML (that's something exclusively for VO nerds)

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