The MeerKAT 1.3 GHz Survey of the Small Magellanic Cloud
arxiv(2024)
摘要
We present new radio continuum images and a source catalogue from the MeerKAT
survey in the direction of the Small Magellanic Cloud (SMC). The observations,
at a central frequency of 1.3 GHz across a bandwidth of 0.8 GHz, encompass a
field of view 7 x 7 degrees and result in images with resolution of 8 arcsec.
The median broad-band Stokes I image Root Mean Squared noise value is 11
microJy/beam. The catalogue produced from these images contains 108,330 point
sources and 517 compact extended sources. We also describe a UHF (544-1088 MHz)
single pointing observation. We report the detection of a new confirmed
Supernova Remnant (SNR) (MCSNR J0100-7211) with an X-ray magnetar at its centre
and 10 new SNR candidates. This is in addition to the detection of 21
previously confirmed SNRs and two previously noted SNR candidates. Our new SNR
candidates have typical surface brightness an order of magnitude below those
previously known, and on the whole they are larger. The high sensitivity of the
MeerKAT survey also enabled us to detect the bright end of the SMC Planetary
Nebulae (PNe) sample - point-like radio emission is associated with 38 of 102
optically known PNe, of which 19 are new detections. Lastly, we present the
detection of three foreground radio stars amidst 11 circularly polarised
sources, and a few examples of morphologically interesting background radio
galaxies from which the radio ring galaxy ESO 029-G034 may represent a new type
of radio object.
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