J/other/PASA/41.3 Rapid ASKAP Continuum Survey. V. 1367.5MHz (Duchesne+, 2024)
The Rapid ASKAP Continuum Survey.
V: Cataloguing the sky at 1 367.5 MHz and the second data release of RACS-mid.
Duchesne S., Grundy J.A., Heald George H., Lenc E., Leung J.K.,
McConnell D., Murphy T., Pritchard J., Rose K., Thomson A.J.M., Wang Y.,
Wang Z., Whiting M.T.
<Publ. Astron. Soc. Australia, 41, e003 (2024)>
=2024PASA...41....3D 2024PASA...41....3D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio sources ; Radio continuum ; Morphology
Keywords: catalogues - surveys - radio continuum: general -
radio continuum: galaxies - radio continuum: stars
Abstract:
The Australian SKA Pathfinder (ASKAP) has surveyed the sky at multiple
frequencies as part of the Rapid ASKAP Continuum Survey (RACS). The
first two RACS observing epochs, at 887.5 (RACS-low) and 1367.5
(RACS-mid) MHz, have been released (McConnell, et al.
2020PASA...37...48M 2020PASA...37...48M; Duchesne, et al. 2023PASA...40...34D 2023PASA...40...34D). A
catalogue of radio sources from RACS-low has also been released,
covering the sky south of declination +30° (Hale, et al.,
2021PASA...38...58H 2021PASA...38...58H). With this paper, we describe and release the
first set of catalogues from RACS-mid, covering the sky below
declination +49°. The catalogues are created in a similar manner
to the RACS-low catalogue, and we discuss this process and highlight
additional changes. The general purpose primary catalogue covering
36200 sq deg features a variable angular resolution to maximise
sensitivity and sky coverage across the catalogued area, with a median
angular resolution of 11.2"x9.3". The primary catalogue comprises
3105668 radio sources, including those in the Galactic Plane (2861923
excluding Galactic latitudes of |b|<5°), and we estimate the
catalogue to be 95% complete for sources above 2mJy.
Description:
Stokes I catalogues from the Rapid ASKAP Continuum Survey (RACS) at
1367.5MHz (RACS-mid). This work took the images of the tiles
associated with the RACS-mid survey at 1367.5MHz, convolved them to a
common resolution, and mosaicked them with neighbouring images to
obtain near-uniform sensitivity images covering the sky up to
declination +49 degrees. Catalogues were made by running PyBDSF (see
Mohan and Rafferty: 2015ascl.soft02007M) over each mosaicked tile
image. These tile catalogues were combined together and duplicates
removed.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
sourcesm.dat 411 3105668 RACS-mid primary source or island catalogue
(RACS-mid_sources)
gcompsm.dat 406 4199578 RACS-mid primary Gaussian component catalogue
(RACS-mid_components)
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See also:
J/other/PASA/38.58 : Rapid ASKAP Continuum Survey. II. RACS cat. (Hale+, 2021)
J/other/PASA/42.38 : RACS VI. RACS-high 1655.5MHz catalogue (Duchesne+, 2025)
https://research.csiro.au/racs/ : RACS project website
https://doi.org/10.25919/p524-xb81 : RACS-mid collection on CASDA
Byte-by-byte Description of file: sourcesm.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 25 A25 --- RACS-MID1 Source name following IAU source name
convention: RACS-MID1 JHHMMSS.s+DDMMSS
(Name)
27- 43 A17 --- SourceID Unique identifier based on the field the
source is located in and the index
assigned by PyBDSF (Source_ID)
45- 56 A12 --- FieldID Field name: RACS_HHMM±DD (Field_ID)
58- 70 F13.9 deg RAdeg Right ascension (J2000) of the source
(RA)
72- 84 F13.9 deg DEdeg Declination (J2000) of the source (Dec)
86- 96 F11.7 deg DEdegc Declination (J2000) of the source after
Declination-dependent offsets applied
(Dec_corr)
98-108 F11.9 deg e_RAdeg Uncertainty on right ascension from
fitting the source position (E_RA)
110-118 F9.7 deg e_DEdeg Uncertainty on declination from fitting
the source position (E_Dec)
120-128 F9.7 deg e_DEdegc Uncertainty on corrected declination
from fitting (EDeccorr)
130-140 F11.3 mJy Ftot Total flux density of the source
(Total_flux)
142-150 F9.4 mJy e_FtotPy Uncertainty in the total flux density
from PyBDSF fitting
(ETotalflux_PyBDSF)
152-160 F9.3 mJy e_Ftot Quadrature sum of the brightness scale
and PyBDSF uncertainties for total flux
density (ETotalflux)
162-171 F10.3 mJy/beam Fpeak Peak flux density of the source
(Peak_flux)
173-180 F8.4 mJy/beam e_FpeakPy Uncertainty in the peak flux density
from PyBDSF fitting
(EPeakflux_PyBDSF)
182-190 F9.3 mJy/beam e_Fpeak Quadrature sum of the brightness scale
and PyBDSF uncertainties for peak flux
density (EPeakflux)
192-199 F8.4 arcsec Maj Size of the major axis of the source
(Maj_axis)
201-208 F8.4 arcsec Min Size of the minor axis of the source
(Min_axis)
210-220 F11.7 deg PA Position angle of the source,
east of north (PA)
222-229 F8.4 arcsec e_Maj Uncertainty in the source major axis
(EMajaxis)
231-238 F8.4 arcsec e_Min Uncertainty in the source minor axis
(EMinaxis)
240-246 E7.2 deg e_PA Uncertainty in the source PA (E_PA)
248-255 F8.4 arcsec DCMaj Deconvolved source major axis
(DCMajaxis)
257-264 F8.4 arcsec DCMin Deconvolved source minor axis
(DCMinaxis)
266-276 F11.7 deg DCPA Deconvolved source PA (DC_PA)
278-285 F8.4 arcsec e_DCMaj Uncertainty in the deconvolved source
major axis (EDCMaj_axis)
287-294 F8.4 arcsec e_DCMin Uncertainty in the deconvolved source
minor axis (EDCMin_axis)
296-302 E7.2 deg e_DCPA Uncertainty in the deconvolved source
PA (EDCPA)
304-310 F7.3 mJy/beam Noise Local estimate of the root-mean-square
noise (Noise)
312-319 F8.5 deg Tilel Direction cosine l of the source with
respect to the field centre (Tile_l)
321-328 F8.5 deg Tilem Direction cosine m of the source with
respect to the field centre (Tile_m)
330-336 F7.5 deg Tilesep Angular separation from the field centre
(Tile_sep)
338-346 F9.5 deg GLON Galactic longitude of the source
(Gal_lon)
348-356 F9.5 deg GLAT Galactic latitude of the source
(Gal_lat)
358-361 F4.1 arcsec PSFMaj Major axis FWHM of the PSF for the field
(PSF_Maj)
363-366 F4.1 arcsec PSFMin Minor axis FWHM of the PSF for the field
(PSF_Min)
368-373 F6.2 deg PSFPA PA of the PSF for the field (PSF_PA)
375 A1 --- SCode Source structure classification by
PyBDSF (S_Code)
377-378 I2 --- NGauss Number of Gaussian components comprising
the source (N_Gaussians)
380 A1 --- Flag [012] Source type flag (Flag) (G1)
382-393 F12.6 yr ScanStartMJD Observation start time in MJD of the
field (ScanstartMJD)
395-400 F6.2 s ScanLength Observation length of the field
(Scan_length)
402-406 I5 --- SBID [20147/41554] Scheduling block ID of
the field (SBID)
408-411 F4.2 --- e_FluxScale Fractional brightness scale uncertainty
(EFluxscale)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: gcompsm.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- RACS-MID1 Source name following IAU source name
convention: RACS-MID1 JHHMMSS.S+DDMMSS
(Name)
20- 36 A17 --- SourceID Unique identifier based on the field the
source is located in and the index
assigned by PyBDSF (Source_ID)
38- 49 A12 --- FieldID Field name: RACS_HHMM+DD (Field_ID)
51- 63 F13.9 deg RAdeg Right ascension (J2000) of the source
(RA)
65- 77 F13.9 deg DEdeg Declination (J2000) of the source (Dec)
79- 89 F11.7 deg DEdegc Declination (J2000) of the source after
declination-dependent offsets applied
(Dec_corr)
91-101 F11.9 deg e_RAdeg Uncertainty on right ascension from
fitting the source position (E_RA)
103-111 F9.7 deg e_Dedeg Uncertainty on declination from fitting
the source position (E_Dec)
113-121 F9.7 deg e_Dedegc Uncertainty on corrected declination
from fitting (EDeccorr)
123-131 E9.4 mJy Ftot Total flux density of the source
(Total_flux)
133-140 E8.3 mJy e_FtotPy Uncertainty in the total flux density
from PyBDSF fitting
(ETotalflux_PyBDSF)
142-148 E7.2 mJy e_Ftot Quadrature sum of the brightness scale
and PyBDSF uncertainties for total
flux density (ETotalflux)
150-160 F11.4 mJy/beam Fpeak Peak flux density of the source
(Peak_flux)
162-169 E8.3 mJy/beam e_FpeakPy Uncertainty in the peak flux density
from PyBDSF fitting
(EPeakflux_PyBDSF)
171-180 F10.4 mJy/beam e_Fpeak Quadrature sum of the brightness scale
and PyBDSF uncertainties for peak
flux density (EPeakflux)
182-194 F13.9 arcsec Maj Size of the major axis of the source
(Maj_axis)
196-210 F15.11 arcsec Min Size of the minor axis of the source
(Min_axis)
212-222 F11.7 deg PA Position angle of the source,
east of north (PA)
224-230 E7.2 arcsec e_Maj Uncertainty in the source major axis
(EMajaxis)
232-238 E7.2 arcsec e_Min Uncertainty in the source minor axis
(EMinaxis)
240-246 E7.2 deg e_PA Uncertainty in the source PA (E_PA)
248-255 F8.4 arcsec DCMaj Deconvolved source major axis
(DCMajaxis)
257-264 F8.4 arcsec DCMin Deconvolved source minor axis
(DCMinaxis)
266-276 F11.7 deg DCPA Deconvolved source PA (DC_PA)
278-284 E7.2 arcsec e_DCMaj Uncertainty in the deconvolved source
major axis (EDCMaj_axis)
286-292 E7.2 arcsec e_DCMin Uncertainty in the deconvolved source
minor axis (EDCMin_axis)
294-300 E7.2 deg e_DCPA Uncertainty in the deconvolved source
PA (EDCPA)
302-308 F7.3 mJy/beam Noise Local estimate of the root-mean-square
noise (Noise)
310-317 F8.5 deg Tilel Direction cosine l of the source with
respect to the field centre (Tile_l)
319-326 F8.5 deg Tilem Direction cosine m of the source with
respect to the field centre (Tile_m)
328-334 F7.5 deg Tilesep Angular separation from the field centre
(Tile_sep)
336-344 F9.5 deg GLON Galactic longitude of the source
(Gal_lon)
346-354 F9.5 deg GLAT Galactic latitude of the source
(Gal_lat)
356-359 F4.1 arcsec PSFMaj Major axis FWHM of the PSF for the field
(PSF_Maj)
361-364 F4.1 arcsec PSFMin Minor axis FWHM of the PSF for the field
(PSF_Min)
366-371 F6.2 deg PSFPA PA of the PSF for the field (PSF_PA)
373 A1 --- SCode Source structure classification by
PyBDSF (S_Code)
375 A1 --- Flag [012] Source type flag (Flag) (G1)
377-388 F12.6 yr ScanStartMJD Observation start time in MJD of the
field (ScanstartMJD)
390-395 F6.2 s ScanLength Observation length of the field
(Scan_length)
397-401 I5 --- SBID [20147/41554] Scheduling block ID of
the field (SBID)
403-406 F4.2 --- e_FluxScale Fractional brightness scale uncertainty
(EFluxscale)
--------------------------------------------------------------------------------
Global notes:
Note (G1): Flag as follows:
0 = unresolved
1 = resolved
2 = spurious
--------------------------------------------------------------------------------
Acknowledgements:
Stefan Duchesne, Stefan.Duchesne(at)csiro.au
References:
McConnell et al., Paper I 2020PASA...37...48M 2020PASA...37...48M
Hale et al., Paper II 2021PASA...38...58H 2021PASA...38...58H, Cat. J/other/PASA/38.58
Thomson et al., Paper III 2023PASA...40...40T 2023PASA...40...40T
Duchesne et al., Paper IV 2023PASA...40...34D 2023PASA...40...34D
Duchesne et al., Paper V 2024PASA...41....3D 2024PASA...41....3D
(End) Patricia Vannier [CDS] 26-Feb-2025