J/MNRAS/529/L88 SMGPS Great Attractor HI galaxy catalogue (Steyn+, 2024)
H I galaxy signatures in the SARAO MeerKAT Galactic Plane Survey.
I. Probing the richness of the great attractor wall across the inner zone of
avoidance.
Steyn N., Kraan-korteweg R.C., Rajohnson S.H.A., Kurapati S., Chen H.,
Frank B., Serra P., Staveley-smith L., Camilo F., Goedhart S.
<Mon. Not. R. Astron. Soc. 529, L88 (2024)>
=2024MNRAS.529L..88S 2024MNRAS.529L..88S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galactic plane ; Surveys ; H I data ;
Radial velocities
Keywords: surveys - galaxies: distances and redshifts -
large-scale structure of Universe - radio lines: galaxies
Abstract:
This paper presents the first HI results extracted from the South
African Radio Astronomy Observatory (SARAO) MeerKAT Galactic Plane
Survey (SMGPS) - a narrow strip (|b|<1.5deg) along the southern Milky
Way. The primary goal consisted in tracing the great attractor (GA)
wall across the innermost zone of avoidance. We reduced a segment
spanning the longitude range 302deg<l<332deg for the redshift range z
< 0.08. The superb SMGPS sensitivity (rms=0.3-0.5mJy/beam- per 44km/s
channel) and angular resolution (∼31"x26") lead to a detection limit
of log(MHI/M☉)<8.5 at the GA distance (Vhel∼3500-6500km/s). A
total of 477 galaxy candidates were identified over the full redshift
range. A comparison of the few HI detections with counterparts in the
literature (mostly HIZOA) found the HI fluxes and other HI parameters
to be highly consistent. The continuation of the GA wall is confirmed
through a prominent overdensity of N=214 detections in the GA
distance range. At higher latitudes, the wall moves to higher
redshifts, supportive of a possible link with the Ophiuchus cluster
located behind the Galactic Bulge. This deep interferometric HI survey
demonstrates the power of the SMGPS in improving our insight of
large-scale structures at these extremely low latitudes, despite the
high obscuration and continuum background.
Description:
SMGPS Great Attractor region full HI galaxy catalogue (Appendix B).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ga-smgps.dat 132 477 GA-SMGPS HI galaxy catalogue
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See also:
J/MNRAS/528/542 : SMGPS Local Void HI galaxy catalogue (Kurapati+, 2024)
J/A+A/695/A144 : SMGPS extended source catalogue (Bordiu+, 2025)
J/MNRAS/546/F1849 : SMGPS compact source catalogue (Mutale+, 2026)
Byte-by-byte Description of file: ga-smgps.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name SMGPS name (SMGPS-HI-JHHMMSS+DDMMSS)
16- 18 A3 --- Mosaic Mosaic in which the galaxy is measured
(T10 - T19)
20- 26 F7.3 deg GLON Galactic longitude
28- 33 F6.3 deg GLAT Galactic latitude
35- 39 F5.3 Jy Fpeak Peak flux density (in 856-1712MHz band )
41- 45 F5.2 Jy.km/s Fint Integrated flux (in 856-1712MHz band )
47- 50 F4.2 Jy.km/s e_Fint Integrated flux error
52- 55 F4.2 mJy RMS Measured local RMS around the detection in
mJy/beam per channel
57- 61 I5 km/s HRV Optical heliocentric velocity
63- 65 I3 km/s W20 The measured line width at 20% of
the peak flux
67- 69 I3 km/s W50 The measured line width at 50% of
the peak flux
71- 75 F5.2 [Msun] log(MHI) HI mass
77 I1 --- Flag Flag (1)
79-130 A52 --- Note Counterpart names or any other note
(JHHMM-DD names represent HIZOA galaxies)
132 A1 --- Note2 [1/2] Additional note (2)
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Note (1): Flag as follows:
1 = definite detection
2 = possible detection
Note (2): Additional note as follows:
1 = Consists of a galaxy A (V∼16483-16532km/s), which could be a
close pair, plus an offset neighbour B (V∼16928km/s).
2 = Special case: very extended on-sky. The dispersed emission does
not appear clear in the moment maps.
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Acknowledgements:
Nadia Steyn, nadia.steyn(at)uwa.edu.au
License: CC-BY-4.0
(End) Patricia Vannier [CDS] 10-Aug-2026