Gravitational arc candidates in the CFHTLS-Archive-Research Survey
CARS
Short Name:
carsarcs scs
Date:
27 Dec 2024 08:31:02
Publisher:
The GAVO DC team
Description:
Candidate gravitational arcs in the 37 deg^2 of
CFHTLS-Archive-Research Survey (CARS). The data include their
post-stamp images, astrometry, photometry (u*,g',r',i'), geometric
properties (length, length-to-width ratio, profile curvature, area),
and photometric redshifts. The arc candidates were selected booth with
an automatic arcfinder, based on a tailored image segmentation and a
color selection, and by visually inspecting the survey.
A collection of images of lensed quasars from various sources.
Included are images from Maidanak Observatory
(ivo://org.gavo.dc/maidanak/res/rawframes/siap), Apache Point
Observatory, from the MiNDSTEp project
(ivo://org.gavo.dc/danish/red/q), and from the Liverpool Robotic
Telescope (ivo://org.gavo.dc/liverpool/res/rawframes/q).
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,...)
Reduced frames of lensed quasar observations from Maidanak
Observatory. See the referenceURL for details on the reduction
procedure and calibration data.
An archive of optical and near-infrared spectra of strongly lensed
quasars and the lensing galaxies. The spectra are resolved to about a
few Ångstroms and are flux-calibrated. The spectra resulted from
deblending the lensed images in bidimensional spectra available from
the SSAP service for `ivo://org.gavo.dc/mlqso/q/s
<http://dc.g-vo.org/mlqso/q/s/info>`_.
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