4 research outputs found
SkyMapper Southern Survey: Data Release 4
We present the fourth data release (DR4) of the SkyMapper Southern Survey
(SMSS), the last major step in our hemispheric survey with six optical filters:
u, v, g, r, i, z. SMSS DR4 covers 26,000 sq.deg from over 400,000 images
acquired by the 1.3m SkyMapper telescope between 2014-03 and 2021-09. The
6-band sky coverage extends from the South Celestial Pole to Dec = +16deg, with
some images reaching Dec ~ +28deg. In contrast to previous DRs, we include all
good-quality images from the facility taken during that time span, not only
those explicitly taken for the public Survey. From the image dataset, we
produce a catalogue of nearly 13 billion detections made from ~700 million
unique astrophysical objects. The typical 10sigma depths for each field range
between 18.5 and 20.5 mag, depending on the filter, but certain sky regions
include longer exposures that reach as deep as 22 mag in some filters. As with
previous SMSS catalogues, we have cross-matched with a host of other imaging
and spectroscopic datasets to facilitate additional science outcomes. SMSS DR4
is now available to the worldwide astronomical community.Comment: 32 pages. Submitted to the Publications of the Astronomical Society
of Australi
SkyMapper Southern Survey: Second Data Release (DR2)
We present the second data release (DR2) of the SkyMapper Southern Survey, a
hemispheric survey carried out with the SkyMapper Telescope at Siding Spring
Observatory in Australia, using six optical filters: . DR2 is the
first release to go beyond the 18mag (10) limit of the Shallow
Survey released in DR1, and includes portions of the sky at full survey depth
that reach >21mag in and filters. The DR2 photometry has a precision as
measured by internal reproducibility of 1% in and , and 0.7% in .
More than 21 000 deg have data in some filters (at either Shallow or Main
Survey depth) and over 7 000 deg have deep Main Survey coverage in all six
filters. Finally, about 18 000 deg have Main Survey data in and
filters, albeit not yet at full depth. The release contains over 120 000
images, as well as catalogues with over 500 million unique astrophysical
objects and nearly 5 billion individual detections. It also contains
cross-matches with a range of external catalogues such as Gaia DR2, Pan-STARRS1
DR1, GALEX GUVcat, 2MASS, and AllWISE, as well as spectroscopic surveys such as
2MRS, GALAH, 6dFGS, and 2dFLenS.Comment: 21 pages, 17 figures. As of 25 Aug 2020, DR2 is available to the
world at http://skymapper.anu.edu.a
SkyMapper Southern Survey: First Data Release (DR1)
We present the first data release (DR1) of the SkyMapper Southern Survey, a
hemispheric survey carried out with the SkyMapper Telescope at Siding Spring
Observatory in Australia. Here, we present the survey strategy, data
processing, catalogue construction and database schema. The DR1 dataset
includes over 66,000 images from the Shallow Survey component, covering an area
of 17,200 deg in all six SkyMapper passbands , while the full area
covered by any passband exceeds 20,000 deg. The catalogues contain over 285
million unique astrophysical objects, complete to roughly 18 mag in all bands.
We compare our point-source photometry with PanSTARRS1 DR1 and note an
RMS scatter of 2%. The internal reproducibility of SkyMapper photometry is on
the order of 1%. Astrometric precision is better than 0.2 arcsec based on
comparison with Gaia DR1. We describe the end-user database, through which data
are presented to the world community, and provide some illustrative science
queries.Comment: 31 pages, 19 figures, 10 tables, PASA, accepte