CASDA Queries (astroquery.casda)

The CSIRO ASKAP Science Data Archive (CASDA) provides access to science-ready data products from observations at the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. These data products include source catalogues, images, spectral line and polarisation cubes, spectra and visbilities. This package allows querying of the data products available in CASDA (https://casda.csiro.au/).

Listing Data Products

The metadata for data products held in CASDA may be queried using the query_region() method. The results are returned in a Table. The method takes a location and either a radius or a height and width of the region to be queried. The location should be specified in ICRS coordinates or an astropy.coordinates.SkyCoord object. For example:

>>> from astroquery.casda import Casda
>>> from astropy.coordinates import SkyCoord
>>> from astropy import units as u
>>> centre = SkyCoord.from_name('NGC 7232')
>>> result_table = Casda.query_region(centre, radius=30*u.arcmin)
>>> print(result_table['obs_publisher_did','s_ra', 's_dec', 'released_date'])
obs_publisher_did       s_ra           s_dec            released_date
                        deg             deg
----------------- --------------- ---------------- ------------------------
         cube-502 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-503 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-504 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-505 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-506 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-507 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-508 333.16767306594 -45.302084636451 2017-08-02T03:51:19.728Z
         cube-453 332.53629746595 -44.850153699406 2017-07-10T05:18:13.482Z
         cube-454 332.53629746595 -44.850153699406 2017-07-10T05:18:13.482Z
         cube-455 332.53629746595 -44.850153699406 2017-07-10T05:18:13.482Z
              ...             ...              ...                      ...
         cube-468 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
         cube-469 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
         cube-470 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
         cube-471 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
         cube-472 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
         cube-473 332.53644868638 -44.834926604835 2017-07-10T05:18:48.812Z
        cube-1170 333.70448386919 -45.966341151806 2019-01-30T13:00:00.000Z
         cube-612 333.30189344648 -50.033321773361 2018-05-25T08:22:51.025Z
         cube-650 326.04487794126 -42.033324601808 2018-05-25T08:22:51.025Z
         cube-651 335.54487794126 -42.033324601808 2018-05-25T08:22:51.025Z
Length = 121 rows

Reference/API

astroquery.casda Package

CSIRO ASKAP Science Data Archive (CASDA)

Classes

CasdaClass() Class for accessing ASKAP data through the CSIRO ASKAP Science Data Archive (CASDA).