Table information for 'emi.main'


This table is available for ADQL queries and through the TAP endpoint.

Resource Description: These are 1.4GHz Very Long Baseline Interferometry images of 532 radio sources with a flux density exceeding 100uJy as determined by Ibar et al. (2009, MNRAS, 397, 281), obtained between 2010-06-03 and 2010-09-03. For all fields, we give frames processed using natural weighting to preserve maximal sensitivity. For the 65 detected sources, we additionally give frames processed using uniform weighting to suppress sidelobes (see Middelberg et al. 2013, A&A 551, 97 for details) in flux density measurements. Some sources have larger images to cover a larger area because the initial coordinates were not sufficiently accurate.

For a list of all services and tables belonging to this table's resource, see Information on resource 'VLBI images of Lockman Hole radio sources'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference 2013A&A...551A..97M (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.

To cite the table as such, we suggest the following BibTeX entry:

  title={{VLBI} images of Lockman Hole radio sources},
  author={Middelberg, E. and Deller, A. and Norris, R. and Fotopuoulou, S. and Salvato, M. and Morgan, J. and Brisken, W. and Lutz, D. and Rovilos, E.},
  howpublished={{VO} resource provided by the {GAVO} Data Center}


Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
dataproduct_type Product type High level scientific classification of the data product, taken from an enumeration N/A meta.code.class
dataproduct_subtype Subtype Data product specific type N/A meta.code.class
calib_level Calibration level Amount of data processing that has been applied to the data [Note calib] N/A meta.code;obs.calib
obs_collection Collection Name of a data collection (e.g., project name) this data belongs to N/A
obs_id Obs. Id Unique identifier for an observation N/A
obs_title Title Free-from title of the data set N/A meta.title;obs
obs_publisher_did Pub. DID Dataset identifier assigned by the publisher. N/A meta.ref.ivoid
obs_creator_did Creator DID Dataset identifier assigned by the creator. N/A
access_url Access URL The URL at which to obtain the data set. N/A meta.ref.url
access_format Media Type MIME type of the resource at access_url N/A meta.code.mime
access_estsize Size Estimated size of data product kbyte phys.size;meta.file
target_name Target Name Source name as in 2009MNRAS.397..281I (VizieR J/MNRAS/397/281) N/A;src
target_class Target Class Class of the target object (star, QSO, ...) N/A src.class
s_ra RA RA of (center of) observation, ICRS deg pos.eq.ra
s_dec Dec Dec of (center of) observation, ICRS deg pos.eq.dec
s_fov FoV Approximate spatial extent for the region covered by the observation deg phys.angSize;instr.fov
s_region coverage Region covered by the observation, as a polygon N/A pos.outline;obs.field
s_resolution Space Res. Best spatial resolution within the data set arcsec pos.angResolution
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure
t_max T_max Upper bound of times represented in the data set d time.end;obs.exposure
t_exptime Exp. Time Total exposure time s time.duration;obs.exposure
t_resolution Res. t Minimal significant time interval along the time axis s time.resolution
em_min λ_min Minimal wavelength represented within the data set m em.wl;stat.min
em_max λ_max Maximal wavelength represented within the data set m em.wl;stat.max
em_res_power λ/Δλ Spectral resolving power lambda/delta lambda N/A spect.resolution
o_ucd Obs. UCD UCD for the product's observable N/A meta.ucd
pol_states Pol. States List of polarization states in the data set N/A meta.code;phys.polarization
facility_name Facility Name of the facility at which data was taken N/A;
instrument_name Instrument Name of the instrument that produced the data N/A;instr
s_xel1 |X| Number of elements (typically pixels) along the first spatial axis. N/A meta.number
s_xel2 |Y| Number of elements (typically pixels) along the second spatial axis. N/A meta.number
t_xel |t| Number of elements (typically pixels) along the time axis. N/A meta.number
em_xel |λ| Number of elements (typically pixels) along the spectral axis. N/A meta.number
pol_xel |Pol| Number of elements (typically pixels) along the polarization axis. N/A meta.number
s_pixel_scale Pix. Scale Sampling period in world coordinate units along the spatial axis arcsec phys.angSize;instr.pixel
em_ucd Spect. UCD Nature of the product's spectral axis (typically, em.freq, em.wl, or N/A meta.ucd
source_table Source Table Name of a TAP-queriable table this data originates from. This source table usually provides more information on the the data than what is given in obscore. See the TAP_SCHEMA of the originating TAP server for details. N/A;meta.table
obsra Obsra Antenna pointing, RA deg pos.eq.ra
obsdec Obsdec Antenna pointing, Dec deg pos.eq.dec
weighting Weighting Natural or uniform, according to weighting method. N/A meta.code
s_resolution_min S_resolution_min Angular resolution, longest baseline and max frequency dependent arcsec pos.angResolution;stat.min
s_resolution_max S_resolution_max Angular resolution, longest baseline and min frequency dependent arcsec pos.angResolution;stat.max

Columns that are parts of indices are marked like this.


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Note calib

The calib_level flag takes the following values:

0 Raw Instrumental data requiring instrument-specific tools
1 Instrumental data processable with standard tools
2 Calibrated, science-ready data without instrument signature
3 Enhanced data products (e.g., mosaics)