Information on Service 'Apertif Lockman - Catalogue'

[Use this service from your browser]

Further access options are discussed below

Apertif is a phased-array feed system for the Westerbork Synthesis Radio Telescope (WSRT), operating at 1.4 GHz and providing forty instantaneous beams over 300 MHz of bandwidth. This data release includes the image of the Lockman Hole field observed with Apertif. The image covers 136 square degree region, has an angular resolution of 15x13 arcseconds and a median background noise of 27 μJy/beam. The corresponding source catalog, complete down to the 0.3 mJy level, includes 55166 sources. https://science.astron.nl/telescopes/wsrt-apertif/apertif-data-access/data-releases/apertif-single-fields/

For a list of all services and tables belonging to this service's resource, see Information on resource 'Apertif Lockman'

Overview

You can access this service using:

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.

Other services provided on the underlying data include:

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
_r Dist. Distance to cone center deg pos.distance
DEC DEC the declination of the source (for the equinox of the image) deg pos.eq.dec;meta.main
E_DEC DEC error the 1-sigma error on the declination of the source deg pos.eq.dec;stat.error
E_Peak_flux Peak flu error the 1-sigma error on the peak flux density per beam of the source mJy/beam N/A
E_RA RA error the error on the right ascension of the source deg pos.eq.ra;stat.error
E_Total_flux Total flux error the 1-sigma error on the total flux density of the source mJy N/A
Isl_rms Island background RMS the average background rms value of the island mJy/beam N/A
Name Source name N/A N/A meta.id;meta.main
Peak_flux Peak flux the peak Stokes I flux density per beam of the source mJy/beam N/A
RA RA the right ascension of the source (for the equinox of the image) deg pos.eq.ra;meta.main
S_Code 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
Total_flux Total flux the total, integrated Stokes I flux density of the source at the reference frequency mJy 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
_r Dist. Distance to cone center deg pos.distance 10
Name Source name N/A N/A meta.id;meta.main 20
RA RA the right ascension of the source (for the equinox of the image) deg pos.eq.ra;meta.main 20
E_RA RA error the error on the right ascension of the source deg pos.eq.ra;stat.error 20
DEC DEC the declination of the source (for the equinox of the image) deg pos.eq.dec;meta.main 20
E_DEC DEC error the 1-sigma error on the declination of the source deg pos.eq.dec;stat.error 20
Total_flux Total flux the total, integrated Stokes I flux density of the source at the reference frequency mJy N/A 20
E_Total_flux Total flux error the 1-sigma error on the total flux density of the source mJy N/A 20
Peak_flux Peak flux the peak Stokes I flux density per beam of the source mJy/beam N/A 20
E_Peak_flux Peak flu error the 1-sigma error on the peak flux density per beam of the source mJy/beam N/A 20
Isl_rms Island background RMS the average background rms value of the island mJy/beam N/A 20
S_Code 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 20

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