J/A+A/695/A144 SMGPS extended source catalogue (Bordiu+, 2025)
The SARAO MeerKAT Galactic Plane Survey extended source catalogue.
Bordiu C., Riggi S., Bufano F., Cavallaro F., Cecconello T., Camilo F.,
Umana G., Cotton W.D., Thompson M.A., Bietenholz M., Goedhart S.,
Anderson L.D., Buemi C.S., Chibueze J.O., Ingallinera A., Leto P., Loru S.,
Mutale M., Rigby A., Trigilio C., Williams G.M.
<Astron. Astrophys. 695, A144 (2025)>
=2025A&A...695A.144B 2025A&A...695A.144B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galactic plane ; Radio continuum
Keywords: catalogs - surveys - HII regions - ISM: supernova remnants -
Galaxy: general - radio continuum: general
Abstract:
We present a catalogue of extended radio sources in the SARAO MeerKAT
Galactic Plane Survey (SMGPS). Compiled from 56 survey tiles and
covering approximately 500 deg2 across the 1st, 3rd and 4th Galactic
quadrants, the catalogue includes 16534 extended and diffuse sources
with areas larger than 5 synthesized beams. Among these, 3891 (24% of
the total) can be confidently associated with known Galactic
radio-emitting objects in the literature, such as HII regions,
supernova remnants, planetary nebulae, luminous blue variables, and
Wolf-Rayet stars. A significant fraction of the remaining sources,
5462 (33%), are candidate extragalactic sources, while 7181 (43%)
remain unclassified. Isolated radio filaments are excluded from the
catalogue. The diversity of extended sources underscores MeerKAT's
contribution to the completeness of censuses of Galactic radio
emitters, and its potential for new scientific discoveries. For the
catalogued sources, we derive basic positional and morphological
parameters, as well as flux density estimates using standard aperture
photometry. This paper describes the methods followed to generate the
catalogue from the original SMGPS tiles, detailing the source
extraction, characterization, and cross-matching procedures.
Additionally, we analyse the statistical properties of the catalogued
populations.
Description:
Name, coordinates, bounding boxes, morphological tags, flux estimates
and related uncertainties and crossmatch information for 16534
extended radio sources (area larger than 5 beams) identified in the
SARAO MeerKAT Galactic Plane Survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
smgpsext.dat 2155 16534 SMGPS extended source catalogue
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Byte-by-byte Description of file: smgpsext.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- TileId SMGPS tile image name (tileid)
12- 23 A12 --- Name Source name (internal) (name)
25- 39 A15 --- IAUName Source IAU name, GLLL.lll+BB.bbb
(iauName)
41- 48 I8 --- npix Number of pixels (npix)
50- 54 I5 --- nnested Number of nested sources (nnested)
56- 58 I3 --- nnestedExt Number of extended nested sources
(nnested_ext)
60-1260 A1201 --- nestedExt List of extended nested sources
(nested_ext)
1262 I1 --- MType Morphology tag (morph_type)
1264-1269 F6.1 pix bboxX Bounding box x coordinate (bbox_x)
1271-1276 F6.1 pix bboxY Bounding box y coordinate (bbox_y)
1278-1281 I4 pix bboxW Bounding box width (bbox_w)
1283-1286 I4 pix bboxH Bounding box height (bbox_h)
1288-1293 F6.1 pix bboxrX Rotated bounding box x coordinate
(bboxrotx)
1295-1300 F6.1 pix bboxrY Rotated bounding box y coordinate
(bboxroty)
1302-1307 F6.1 pix bboxrW Rotated bounding box width (bboxrotw)
1309-1314 F6.1 pix bboxrH Rotated bounding box height (bboxroth)
1316-1321 F6.1 deg bboxrtheta Bounding box rotation angle
(bboxrottheta)
1323-1328 F6.1 pix x0 Centroid x coordinate (x0)
1330-1335 F6.1 pix y0 Centroid y coordinate (y0)
1337-1345 F9.5 deg GLON Centroid Galactic longitude (l)
1347-1354 F8.5 deg GLAT Centroid Galactic latitude (b)
1356-1364 F9.5 deg RAdeg Centroid Right Ascension (J2000) (ra)
1366-1374 F9.5 deg DEdeg Centroid Declination (J2000) (dec)
1376-1384 F9.1 pix x0w ?=-999.0 Flux-weighted centroid
x coordinate (x0_w)
1386-1394 F9.1 pix y0w ?=-999.0 Flux-weighted centroid
y coordinate (y0_w)
1396-1405 F10.5 deg GLONw ?=-99 Flux-weighted centroid
Galactic longitude (l_w)
1406-1414 F9.5 deg GLATw ?=-99 Flux-weighted centroid
Galactic latitude (b_w)
1416-1421 F6.1 pix Rad Bounding box half-diagonal (radius)
1423-1429 F7.3 arcmin RadWCS Bounding box half-diagonal (radius_wcs)
1431-1436 F6.1 pix x0minc Minimum bounding circle centroid
x coordinate (x0_mincircle)
1438-1443 F6.1 pix y0minc Minimum bounding circle centroid
y coordinate (y0_mincircle)
1445-1450 F6.1 pix Radminc Minimum bounding circle radius
(radius_mincircle)
1452-1460 F9.5 deg x0mincWCS Minimum bounding circle centroid
Galactic longitude (x0mincirclewcs)
1462-1469 F8.5 deg y0mincWCS Minimum bounding circle centroid
Galactic latitude (y0mincirclewcs)
1471-1477 F7.3 arcmin RadmincWCS Minimum bounding circle radius
(radiusmincirclewcs)
1479-1485 F7.3 arcmin minSizeWCS Minimum size of the minimum bounding
rectangle (minSize_wcs)
1487-1493 F7.3 arcmin maxSizeWCS Maximum size of the minimum bounding
rectangle (maxSize_wcs)
1495-1518 E24.17 Jy/beam S Sum of source brightness (S)
1520-1543 E24.17 Jy/beam Smin Minimum source brightness (Smin)
1545-1568 E24.17 Jy/beam Smax Maximum source brightness (Smax)
1570-1593 E24.17 Jy/beam Smean Mean source brightness (Smean)
1595-1618 E24.17 Jy/beam Smedian Median source brightness (Smedian)
1620-1641 E22.17 Jy/beam Sstddev Stddev of the source brightness
(Sstddev)
1643-1666 E24.17 Jy/beam Sbkg Sum of background brightness from
median estimator (Sbkg)
1668-1691 E24.17 Jy/beam SbkgInterp Sum of background brightness from
interpolation (Sbkg_interp)
1693-1716 E24.17 Jy/beam SbkgFit Sum of background brightness from
polynomial fit (Sbkg_fit)
1718-1740 E23.17 Jy/beam SerrBkg Background brightness uncertainty
(Serr_bkg)
1742-1763 E22.16 Jy/beam SerrNoise Total source brightness uncertainty
(Serr_noise)
1765-1786 F22.16 Jy/beam Snoise Sum of background rms extrapolated over
source size in beams (Snoise)
1788-1811 E24.17 Jy/beam Stot Background-subtracted source brightness
(Stot)
1813-1833 F21.16 Jy/beam e_Stot ?=-999 Background-subtracted source
brightness uncertainty (Stot_err)
1835-1858 E24.17 Jy Flux ?=-999 Source flux density
(background-subtracted) (flux)
1860-1881 E22.17 Jy e_Flux ?=-999 Source flux density uncertainty
(fluxErr)
1883-1904 F22.16 Jy/beam StotNested Sum of source brightness of nested
point-like and compact sources
(Stot_nested)
1906-1927 E22.16 Jy/beam e_StotNested ?=-999 Uncertaintyin the sum of source
brighness of nested point-like and
compact sources (Stoterrnested)
1929-1952 E24.17 Jy/beam StotnoPS Source brightness after subtracting
nested compact sources (Stot_noPS)
1954-1974 F21.16 Jy/beam e_StotnoPS ?=-999 Uncertainty of source brightness
after subtracting nested compact
sources (StoterrnoPS)
1976-1999 E24.17 Jy FluxnoPS Source flux density after subtracting
nested compact sources (flux_noPS)
2001-2022 E22.17 Jy e_FluxnoPS ?=-999 Uncertainty in source flux
density after subtracting nested
compact sources (fluxerrnoPS)
2024 I1 --- FluxReliab [0/1] Flux density is likely reliable
considering theoretical spatial
filtering (0=NO, 1=YES)
(isfluxreliable)
2026 I1 --- Border [0/1] Source is in the tile border
(0=NO,1=YES) (border)
2028-2040 A13 --- ClassName Source classification label (classname)
2042-2043 I2 --- ClassId [-1/6]? Source classification
(classid) (1)
2045-2155 A111 --- ONames Crossmatched catalogue source(s)
(objname)
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Note (1): Source classification code as follows:
-1 = MULTICLASS
0 = UNCLASSIFIED
1 = LBV/WR
2 = GALAXY
3 = PN
4 = SNR
6 = HII
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Acknowledgements:
Cristobal Bordiu, cristobal.bordiu(at)inaf.it
Simone Riggi, simone.riggi(at)inaf.it
(End) Patricia Vannier [CDS] 09-Feb-2025