Further access options are discussed below
For a list of all services and tables belonging to this service's resource, see Information on resource 'Apertif DR-1'
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:
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 |
---|---|---|---|---|
beam_number | Beam number | Beam number | N/A | meta.id;instr.beam |
DEC | Delta (ICRS) | Declination (ICRS decimal) | deg | pos.eq.dec |
FORMAT | Output format | Requested format of the image data | N/A | N/A |
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 |
INTERSECT | Intersection type | Relation of image and specified Region of Interest. | N/A | N/A |
MAXREC | Match limit | Maximum number of records returned. Pass 0 to retrieve service parameters. | N/A | N/A |
obsid | ObsId | Observation id | N/A | meta.id |
POS | Position | ICRS Position, RA,DEC decimal degrees (e.g., 234.234,-32.46) | deg | pos.eq |
RA | Alpha (ICRS) | Right Ascension (ICRS decimal) | deg | pos.eq.ra |
RESPONSEFORMAT | Output Format | File format requested for output. | N/A | meta.code.mime |
SIZE | Field size | Size in decimal degrees (e.g., 0.2 or 1,0.1) | deg | N/A |
SR | Search Radius | Search radius | deg | N/A |
target | Field Name | Name of the field | N/A | meta.id |
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 |
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 |
---|---|---|---|---|
_r | Dist. | Distance to cone center | deg | pos.distance |
accref | Product key | Access key for the data | N/A | N/A |
accsize | File size | Size of the data in bytes | byte | VOX:Image_FileSize |
bandpassHi | Band upper | Upper limit of the bandpass (in BandPass_Unit units) | m | VOX:BandPass_HiLimit |
bandpassId | Bandpass | Freeform name of the bandpass used | N/A | VOX:BandPass_ID |
bandpassLo | Band lower | Lower limit of the bandpass (in BandPass_Unit units) | m | VOX:BandPass_LoLimit |
bandpassRefval | Band Ref. | Characteristic quantity for the bandpass of the image | m | VOX:BandPass_RefValue |
bandpassUnit | Bandpass unit | Unit of bandpass specifications (always m). | N/A | VOX:BandPass_Unit |
beam_number | Beam | Number of the beam | N/A | meta.id;instr.beam |
centerAlpha | Ctr. RA | Approximate center of image, RA | deg | pos.eq.ra;meta.main |
centerDelta | Ctr. Dec | Approximate center of image, Dec | deg | pos.eq.dec;meta.main |
coverage | Coverage | Field covered by the image | deg | N/A |
cube_key | Cube key | N/A | N/A | meta.id |
cube_qual | Qual. flag | Quality flag (G: Good, O: Okay, B: Bad) | N/A | meta.code.qual |
dateObs | Obs. date | Epoch at midpoint of observation | d | VOX:Image_MJDateObs |
f_ex | f_ex | Fraction of the total number of pixels with an absolute value > 6.75 sigma | N/A | stat.value |
freqMax | max. Frequency | Maximum frequency | MHz | em.freq |
freqMin | min. Frequency | Minimum frequency | MHz | em.freq |
imageTitle | Title | Synthetic name of the image | N/A | VOX:Image_Title |
instId | Instrument | Identifier of the originating instrument | N/A | INST_ID |
mime | Type | MIME type of the file served | N/A | meta.code.mime |
n_channels | # channels | Number of channels | N/A | em.bin |
nAxes | #axes | Number of axes in data | N/A | VOX:Image_Naxes |
obsid | ObsId | Unique id | N/A | meta.id |
p_0pt8 | p_0.8 | Ratio between the width of the noise histogram at a level of 0.8% of the maximum and rms | N/A | stat.value |
pixelScale | Scales | The pixel scale on each image axis | deg/pix | VOX:Image_Scale |
pixelSize | Axes Lengths | Number of pixels along each of the axes | pix | VOX:Image_Naxis |
pixflags | P. Flags | Flags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display only | N/A | VOX:Image_PixFlags |
pub_did | P. DID | Dataset identifier assigned by the publisher | N/A | meta.id;meta.main |
refFrame | Ref. Frame | Coordinate system reference frame | N/A | VOX:STC_CoordRefFrame |
related_products | Related products | Link related products for the observation | N/A | meta.ref.url |
sigma | Noise rms | rms noise in the central velocity channel | mJy/beam | stat.error |
target | Field | Name of the field | N/A | meta.id |
task_id | Task id | ID of the task | N/A | meta.id |
valid | Passed validation | Whether or not the dataset has passed validation | N/A | meta.code.qual |
wcs_cdmatrix | CD matrix | FITS WCS CDij matrix | deg/pix | VOX:WCS_CDMatrix |
wcs_equinox | Equinox | Equinox of the given coordinates | yr | VOX:STC_CoordEquinox |
wcs_projection | Proj. | FITS WCS projection type | N/A | VOX:WCS_CoordProjection |
wcs_refPixel | Ref. pixel | WCS reference pixel | pix | VOX:WCS_CoordRefPixel |
wcs_refValues | Ref. values | World coordinates at WCS reference pixel | deg | VOX:WCS_CoordRefValue |
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 |
---|---|---|---|---|---|
centerAlpha | Ctr. RA | Approximate center of image, RA | deg | pos.eq.ra;meta.main | 0 |
centerDelta | Ctr. Dec | Approximate center of image, Dec | deg | pos.eq.dec;meta.main | 0 |
imageTitle | Title | Synthetic name of the image | N/A | VOX:Image_Title | 0 |
dateObs | Obs. date | Epoch at midpoint of observation | d | VOX:Image_MJDateObs | 0 |
accref | Product key | Access key for the data | N/A | N/A | 1 |
target | Field | Name of the field | N/A | meta.id | 1 |
related_products | Related products | Link related products for the observation | N/A | meta.ref.url | 1 |
_r | Dist. | Distance to cone center | deg | pos.distance | 10 |
bandpassId | Bandpass | Freeform name of the bandpass used | N/A | VOX:BandPass_ID | 10 |
accsize | File size | Size of the data in bytes | byte | VOX:Image_FileSize | 11 |
pixelScale | Scales | The pixel scale on each image axis | deg/pix | VOX:Image_Scale | 12 |
instId | Instrument | Identifier of the originating instrument | N/A | INST_ID | 15 |
pixelSize | Axes Lengths | Number of pixels along each of the axes | pix | VOX:Image_Naxis | 15 |
pub_did | P. DID | Dataset identifier assigned by the publisher | N/A | meta.id;meta.main | 15 |
mime | Type | MIME type of the file served | N/A | meta.code.mime | 20 |
nAxes | #axes | Number of axes in data | N/A | VOX:Image_Naxes | 20 |
refFrame | Ref. Frame | Coordinate system reference frame | N/A | VOX:STC_CoordRefFrame | 20 |
wcs_equinox | Equinox | Equinox of the given coordinates | yr | VOX:STC_CoordEquinox | 20 |
wcs_projection | Proj. | FITS WCS projection type | N/A | VOX:WCS_CoordProjection | 20 |
wcs_refPixel | Ref. pixel | WCS reference pixel | pix | VOX:WCS_CoordRefPixel | 20 |
wcs_refValues | Ref. values | World coordinates at WCS reference pixel | deg | VOX:WCS_CoordRefValue | 20 |
wcs_cdmatrix | CD matrix | FITS WCS CDij matrix | deg/pix | VOX:WCS_CDMatrix | 20 |
bandpassUnit | Bandpass unit | Unit of bandpass specifications (always m). | N/A | VOX:BandPass_Unit | 20 |
bandpassRefval | Band Ref. | Characteristic quantity for the bandpass of the image | m | VOX:BandPass_RefValue | 20 |
bandpassHi | Band upper | Upper limit of the bandpass (in BandPass_Unit units) | m | VOX:BandPass_HiLimit | 20 |
bandpassLo | Band lower | Lower limit of the bandpass (in BandPass_Unit units) | m | VOX:BandPass_LoLimit | 20 |
pixflags | P. Flags | Flags specifying the processing done (C-original; F-resampled; Z-fluxes valid; X-not resampled; V-for display only | N/A | VOX:Image_PixFlags | 20 |
coverage | Coverage | Field covered by the image | deg | N/A | 20 |
obsid | ObsId | Unique id | N/A | meta.id | 20 |
valid | Passed validation | Whether or not the dataset has passed validation | N/A | meta.code.qual | 20 |
task_id | Task id | ID of the task | N/A | meta.id | 20 |
beam_number | Beam | Number of the beam | N/A | meta.id;instr.beam | 20 |
freqMin | min. Frequency | Minimum frequency | MHz | em.freq | 20 |
freqMax | max. Frequency | Maximum frequency | MHz | em.freq | 20 |
n_channels | # channels | Number of channels | N/A | em.bin | 20 |
cube_key | Cube key | N/A | N/A | meta.id | 20 |
cube_qual | Qual. flag | Quality flag (G: Good, O: Okay, B: Bad) | N/A | meta.code.qual | 20 |
sigma | Noise rms | rms noise in the central velocity channel | mJy/beam | stat.error | 20 |
f_ex | f_ex | Fraction of the total number of pixels with an absolute value > 6.75 sigma | N/A | stat.value | 20 |
p_0pt8 | p_0.8 | Ratio between the width of the noise histogram at a level of 0.8% of the maximum and rms | N/A | stat.value | 20 |
owner | Owner | Owner of the data | N/A | N/A | 25 |
embargo | Embargo ends | Date the data will become/became public | a | N/A | 25 |
If you use this data, cite Adams et al. 2022 (2022A&A...667A..38A). Additionally, you can cite the service reference. The Apertif data release 1 is licensed under the Creative Commons Attribution 3.0 License
VOResource XML (that's something exclusively for VO nerds)