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.
From 1986 through 1991, the Astronomical Institute of Münster
University performed a search for flare stars in several southern
associations and open stellar clusters using the GPO telescope (d=40
cm, WFPDB identifier ESO040); the fields suveyed include Coalsack,
M42, B228 Lup, the Chameleon T1 association, omicron Vel cluster, R
CrA association, the Pipe nebula (B59 Oph), and the Sco-Oph
association. This was done primarily through multiple exposures. The
files published here are plate scans done in 2017.
The obscore collection name for these files is Muenster Flare Survey.
In the context of Kapteyn's plan to obtain a photometric standard, in
Potsdam more than 400 photographic plates of several Selected Areas,
Special Areas, and Kapteyn-Pritchard areas were obtained between 1910 and
1933, both as direct images and with an object prism. This service
provides FITS images of the science area of the plates as well as images of
the entire plates, including previous markings.
Sasmirala Subarcsecond mid-infrared atlas of local AGN
Short Name:
sasmirala atlas
Date:
27 Dec 2024 08:31:05
Publisher:
The GAVO DC team
Description:
These FITS images were generated with the IDL package MIRphot
[Asmus2014]_ by extraction (and combination) of the sub-images from the
chopped/nodded total images from COMICS, Michelle, T-ReCS and VISIR (see
[Asmus2014]_ for details).
The FITS images contain the central ~4 arcsec of each source centered on
the (putative) nuclear position with North being up and East to the
left. The WCS registration has been performed after extraction by using
coordinates of the nucleus from other wavelengths (mostly 2MASS and
NED). The uncertainty of these reference position is usually less than 1
arcsec. In addition, the imprecision of the assignment itself is ~1px ~
0.1".
The FITS images are flux calibrated (unit is mJy) using the Gaussian 2D
fits to the corresponding STD observation (where available, otherwise
using the median conversion factor for the used instrument/filter
settings). Therefore, correction factors have to be applied in case
other flux measurement methods are applied to the images. The flux
values given in the FITS headers should be regarded as approximate
values. In particular for the instruments, VISIR and COMICS, they are
not necessarily exactly equal to the values provided in the photometry
results table, because many flux measurements were performed during the
process of combining individual subimages (all in MIRphot), instead of
in the final combined image, provided here. The used total images are
available upon request. Note, however, that these are just the products
of the observatory-delivered pipelines with default parameters.
.. [Asmus2014] Asmus D., Hoenig S.F., Gandhi P., Smette A.,
Duschl W.: The subarcsecond mid-infrared view of local active
galactic nuclei: I. The N- and Q-band imaging atlas,
`2014MNRAS.439.1648A <http://ads.ari.uni-heidelberg.de/abs/2014MNRAS.439.1648A>`_
This service publishes plate scans of the Palomar-Leiden Troian
surveys conducted between 1960 and 1977. The surveys led to the
discovery of more than 2,000 asteroids (1,800 with orbital information),
with another 2,400 asteroids, including 19 Trojans, found after further
analysis of the plates.
Note that because of the large size of the plates, in this service each
original plate is contained in two parts, marked with "_1" and "_2",
respectively. The central parts
of the two parts overlap.
![To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to the HDAP scans. For details, see the `Creative Commons CC0 1.0 Public Domain dedication <http://creativecommons.org/publicdomain/zero/1.0/>`_. Of course, you should still give proper credit when using this data as required by good scientific practice. .. image:: /static/img/cc0.png :alt: [CC0]](/registry-search/?f%5BcapabilityType_facet%5D%5B%5D=Simple+Image+Access+Protocol&f%5Bpublisher_facet_trim%5D%5B%5D=The+GAVO+DC+team&f%5Brights_facet%5D%5B%5D=To+the+extent+possible+under+law%2C+the+publisher+has+waived+all+copyright+and+related+or+neighboring+rights+to+the+HDAP+scans.++For+details%2C+see+the+%60Creative+Commons+CC0+1.0+Public+Domain+dedication+%3Chttp%3A%2F%2Fcreativecommons.org%2Fpublicdomain%2Fzero%2F1.0%2F%3E%60_.++Of+course%2C+you+should+still+give+proper+credit+when+using+this+data+as+required+by+good+scientific+practice.%0A%0A..+image%3A%3A+%2Fstatic%2Fimg%2Fcc0.png%0A+++%3Aalt%3A+%5BCC0%5D%0A%0A){kind=link}
![the Fornax VST Survey is licensed under the `Creative Commons Attribution 4.0 License <http://creativecommons.org/licenses/by/4.0/>`_ .. image:: /static/img/ccby.png :alt: [CC-BY]](/registry-search/?f%5BcapabilityType_facet%5D%5B%5D=Simple+Image+Access+Protocol&f%5Bpublisher_facet_trim%5D%5B%5D=The+GAVO+DC+team&f%5Brights_facet%5D%5B%5D=the+Fornax+VST+Survey+is+licensed+under+the+%60Creative+Commons+Attribution+4.0+License+%3Chttp%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby%2F4.0%2F%3E%60_%0A%0A..+image%3A%3A+%2Fstatic%2Fimg%2Fccby.png%0A+++%3Aalt%3A+%5BCC-BY%5D%0A%0A){kind=link}