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Spectra and Polarisation In Cutouts of Extragalactic sources from RACS First Data Release (SPICE-RACS-DR1)

CSIRO RDS Repository

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Title Spectra and Polarisation In Cutouts of Extragalactic sources from RACS First Data Release (SPICE-RACS-DR1)
 
Creator Alec Thomson
 
Subject Cosmology and extragalactic astronomy
Cosmology and extragalactic astronomy
Astronomical sciences not elsewhere classified
 
Description Spectra and Polarisation In Cutouts of Extragalactic sources from RACS (SPICE-RACS) is a project to derive an all-Southern-sky, linear polarisation map from the Rapid ASKAP Continuum Survey (RACS). Through this project, we will derive the following products:
- Cutout image cubes in Stokes I, Q, and U around every source detected in total intensity as a function of frequency
- Polarisation spectra as a function of frequency and Faraday depth for every component detected in total intensity
- A catalogue summarising the polarisation properties, including rotation measure (RM), for every component.

This collection represents a subset of the data presented in SPICE-RACS-DR1 (Thomson et al. 2023). This subset refers to the 24680 components ('cut') (out of the 'full' 105912) for which a reliable polynomial fit could be derived for the Stokes I spectra that were extracted. This collection contains the 'cut' subset, please see the linked collections for the 'full' data.

Our final data products are as follows:

spice-racs.dr1.corrected.{cut,full}.xml:

- Our component catalogue in VOTable format for the first (cut) and second (full) sets of components described above. The former is included with this deposit.

{source_id}.cutout.{image,weights}.*.fits:

- Image and weights cube cutout in Stokes I, Q, and U cutout around a RACS-low source identified by ‘source_id’. The data dimensions are J2000 right ascension and declination, Stokes parameter, and frequency.

{cat_id}_polspec.fits:

- Polarisation spectra extracted on the position of the RACS-low component identified by ‘cat_id’ in POLSPECTRA format. Each table contains a single row, corresponding to the component.

spice_racs_dr1_polspec_{cut,full}.tar:
- A tarball containing all of the POLSPECTRA for the 'cut' and second 'full' sets of components described above. These are available in the linked collections.

Recommended catalogue subsets:
Our 'full' catalogue contains extracted polarisation data for all 105912 Stokes I components detected in our DR1 region. It is important to note that the majority of these do not have reliably detected polarised emission. When using this catalogue please use the provided flags, and uncertainty/quality metrics to derive a subset suitable for your science goals. If you're unsure where to start, these are our recommended basic subsets:

- 'goodI' : Where our Stokes I model is reliable -- channel_flag and stokesI_fit_flag are False (this produces the 'cut' catalogue from the 'full').
- 'goodL': Where we have a reliable detection of polarised signal, but not necessarily a reliable RM -- goodI plus leakage_flag is False and snr_polint >= 5.
- 'goodRM': Where the RM is reliable -- goodL plus snr_flag is False.
 
Publisher CSIRO
 
Contributor David McConnell
Emil Lenc
Tim Galvin
Lawrence Rudnick
George Heald
Catherine Laura Hale
Stefan Duchesne
Craig Anderson
Ettore Carretti
Christoph Federrath
Bryan Gaensler
Lisa Harvey-Smith
Marijke Haverkorn
Aidan Hotan
Jackie Ma
Tara Murphy
Naomi Mcclure-Griffiths
Vanessa Moss
Shane O'Sullivan
Wasim Raja
Amit Seta
Cameron Van Eck
Jennifer West
Matthew Whiting
Mark Wieringa
Minh Huynh
 
Date 2023-08-21
 
Type —
 
Format —
 
Identifier csiro:58508
 
Language —
 
Coverage —
 
Rights —