Information on Service 'Liverpool Quasar Lens Monitoring'

[Use this service from your browser]

Further access options are discussed below

This collection includes optical monitorings of gravitationally lensed quasars. The frames can be used to make light curves of quasar images and field objects. From quasar light curves, one may measure time delays and flux ratios, analyse variability and chromaticity, etc. These direct analyses/measurements are basic tools for different astrophysical studies, e.g., expansion rate of the Universe, mechanism of intrinsic variability in quasars, accretion disk structure, supermassive black holes, dark halos of galaxies (dust, collapsed dark matter, smoothly distributed dark matter,...)

For a list of all services and tables belonging to this service's resource, see Information on resource 'Liverpool Quasar Lens Monitoring'

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.

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):

NameTable Head DescriptionUnitUCD
airmass Air mass Air mass at center of observation N/A obs.airMass
background Background Background in counts ct.s**-1 instr.background
bandpassId Bandpass Freeform name of the bandpass used N/A instr.bandpass
dateObs Obs. date Epoch at midpoint of observation d time;obs.exposure
exposure Exp. time Exposure time s time.duration;obs.exposure
object Target Object Object observed, Simbad resolvable identifier N/A meta.id
seeing Seeing Estimate for seeing at observation time arcsec instr.obsty.seeing

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
accref Product key Access key for the data N/A meta.ref.url
accsize File size Size of the data in bytes byte VOX:Image_FileSize
airmass Air mass Air mass at center of observation N/A obs.airMass
background Background Background in counts ct.s**-1 instr.background
bandpassId Bandpass Freeform name of the bandpass used N/A instr.bandpass
exposure Exp. time Exposure time s time.duration;obs.exposure
moondist Lunar dist. Lunar distance from target deg pos.angDistance
moonfrac Moon illum. Fraction of illuminated area of the moon at obs. time N/A obs.param;arith.ratio
object Target Object Object observed, Simbad resolvable identifier N/A meta.id
seeing Seeing Estimate for seeing at observation time arcsec instr.obsty.seeing
startTime UT of obs. start UT at start of observation N/A time.start

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
centerAlpha Ctr. RA Approximate center of image, RA deg pos.eq.ra 0
centerDelta Ctr. Dec Approximate center of image, Dec deg pos.eq.dec 0
imageTitle Title Synthetic name of the image N/A meta.title 0
dateObs Obs. date Epoch at midpoint of observation d time;obs.exposure 0
accref Product key Access key for the data N/A meta.ref.url 1
bandpassId Bandpass Freeform name of the bandpass used N/A instr.bandpass 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 pos.wcs.scale 12
instId Instrument Identifier of the originating instrument N/A meta.id;instr 15
pixelSize Axes Lengths Number of pixels along each of the axes pix pos.wcs.naxis 15
mime Type MIME type of the file served N/A meta.code.mime 20
nAxes #axes Number of axes in data N/A pos.wcs.naxes 20
refFrame Ref. Frame Coordinate system reference frame N/A pos.frame 20
wcs_equinox Equinox Equinox of the given coordinates yr time.equinox 20
wcs_projection Proj. FITS WCS projection type N/A pos.wcs.ctype 20
wcs_refPixel Ref. pixel WCS reference pixel pix pos.wcs.crpix 20
wcs_refValues Ref. values World coordinates at WCS reference pixel deg pos.wcs.crval 20
wcs_cdmatrix CD matrix FITS WCS CDij matrix deg/pix pos.wcs.cdmatrix 20
bandpassUnit Bandpass unit Unit of bandpass specifications (always m). N/A N/A 20
bandpassRefval Band Ref. Characteristic quantity for the bandpass of the image m instr.bandpass;stat.median 20
bandpassHi Band upper Upper limit of the bandpass (in BandPass_Unit units) m instr.bandpass;stat.max 20
bandpassLo Band lower Lower limit of the bandpass (in BandPass_Unit units) m instr.bandpass;stat.min 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 meta.code 20
coverage Coverage Field covered by the image deg N/A 20
creation_date Creation Date Date of FITS file creation d time.creation 20
type Obs. Type Type of the observation (Science, Flat...) N/A meta.code.class 20
object Target Object Object observed, Simbad resolvable identifier N/A meta.id 20
raw_object Target Object (Header) Object observed as given in the header N/A meta.id 20
observatory Observed at Observatory of origin for this frame N/A meta.id;instr.obsty 20
telescope Telescope Telescope used to obtain the frame N/A instr.tel 20
instrument Instrument Identifier of the originating instrument N/A N/A 20
detector Detector Detector used N/A meta.id;instr 20
exposure Exp. time Exposure time s time.duration;obs.exposure 20
airmass Air mass Air mass at center of observation N/A obs.airMass 20
moonfrac Moon illum. Fraction of illuminated area of the moon at obs. time N/A obs.param;arith.ratio 20
moondist Lunar dist. Lunar distance from target deg pos.angDistance 20
l1sat Saturated? Saturation of the brightest object in the field ct instr.saturation;stat.max 20
background Background Background in counts ct.s**-1 instr.background 20
seeing Seeing Estimate for seeing at observation time arcsec instr.obsty.seeing 20
startTime UT of obs. start UT at start of observation N/A time.start 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

The Liverpool robotic telescope frames have been obtained from different observational programmes conducted by the GLENDAMA team, and are in the public domain. Additional information (Liverpool Quasar Lens Monitoring project, data releases and other scientific outputs, etc) are available at the GLENDAMA Web Site.

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