The Westerbork Northern Sky Survey (<i>WENSS</i>) is a low-frequency
radio survey that covers the whole sky north of delta=30 degree at a
wavelength of 92 cm to a limiting flux density of approximately 18 mJy
(5 sigma). This survey has a resolution of 54" x 54" cosec (delta)
and a positional accuracy for strong sources of 1.5''.
<p>
Further information on the survey including links to catalogs
derived from the survey is available at the
<a href="https://web.archive.org/web/20041204180313/http://www.strw.leidenuniv.nl/wenss/"><i>WENSS</i> website</a>.
<p>
The <i>WENSS</i> survey is included on the <b>SkyView High Resolution Radio
Coverage </b><a href="https://skyview.gsfc.nasa.gov/images/high_res_radio.jpg"> map</a>. This map shows
coverage on an Aitoff projection of the sky in equatorial coordinates.
<p> Provenance: <i>WENSS</i> Team. Data downloaded
from
<a href=ftp://vliet.strw.leidenuniv.nl/pub/wenss/HIGHRES/>
<i>WENSS</i> FTP site</a> 1999-03-18.
The <i>WENSS</i> project is a collaboration between the
<a href="https://www.astron.nl/astronomy/">Netherlands Foundation for Research in
Astronomy</a> (NFRA/ASTRON) and the
<a href="https://local.strw.leidenuniv.nl/">Leiden Observatory</a>.. This is a service of NASA HEASARC.
WISE 3\.4 Micron All-Sky Survey>: All-WISE data release
Short Name:
WISE
Date:
07 Mar 2025
Publisher:
NASA/GSFC HEASARC
Description:
From the <a href="https://wise2.ipac.caltech.edu/docs/release/allsky">WISE mission site:</a>.
<hr>
NASA's Wide-field Infrared Survey Explorer (WISE) mapped the
sky at 3.4, 4.6, 12 and 22 micrometers in 2010 with an
angular resolution of 6.1", 6.4", 6.5" and 12.0" in the four bands.
WISE achieved a 5 sigma point source sensitivities better and 0.08, 0.11
1 and 6 mJy in unconfused regions on the ecliptic in the four
bands. Sensitivity improves toward the ecliptic poles due to denser
coverage and lower zodaical background.
<p>
The WISE All-WISE
includes all data taking during the WISE full cryogenic phase, from January 7, 2010 to August 6, 2010, that were processed
with improved calibrations and reduction algorithms and combines this with the NEOWISE postcryogenic
survey to form the most comprehensive view of the full mid-infrared sky.
bibcode=1995ApJ...451..564V,2010ApJ...713..912W <hr>
<p>
SkyView includes the four WISE bands as separate surveys. Many non-image
data products are available at the WISE site. Note that WISE data is
distributed in relatively large (>50 MB) image files. When SkyView generates
an image for a part of the sky where it has not yet cached the
data from the IPAC server there may be a delay as full tiles are downloaded
even when only a small fraction of a tile is needed. Images
in cached regions, are generated much faster. Access to
the WISE data uses the VO SIA interface maintained at IPAC. Even when
data is cached, the SIA service must still be available for successful
queries. Provenance: WISE Archive (IRSA/IPAC). This is a service of NASA HEASARC.
These survey represents a combination of the 9-year data combined
in a way that is intended
to minimize the contribution from the galaxy. The data measure the temperature deviation
from a uniform black body.
<p>
The original data are available at the <https://lambda.gsfc.nasa.gov>LAMBDA archive</a>.
<p>
The original data are stored in HEALPix pixels. SkyView treats HEALPix as a standard
projection but assumes that the HEALPix data is in a projection plane with a rotation of -45 degrees.
The rotation transforms the HEALPix pixels from diamonds to squares so that the boundaries of the
pixels are treated properly. The special HealPixImage class is used so that SkyView can use
the HEALPix FITS files directly. The HealPixImage simulates a rectangular image but
translates the pixels from that image to the nested HEALPix structure that is used
by the WMAP data.
</p> Provenance: WMAP Mission/LAMBDA archive. This is a service of NASA HEASARC.
