MeerKAT's Epic Image of the Galactic Centre, what are we seeing? In this answer as well as this one, I've linked to New Jersey Institute of Technology's Dr. Dale Gary's nicely-written Physics 728 Radio Astronomy; Lecture #1 notes where I can see the image below. It links to Gizmodo.au's New South African Telescope Releases Epic Image Of The Galactic Centre.

I have heard of the Meerkat array earlier (Which 16 antenna locations are used for the MeerKAT radio image recently announced?), but I am wondering how to read further about this spectacular image. What is the scale for example? How would it look pasted into the arc of the Milky Way; just a tiny patch of a few arc-minutes, or several tens of degrees?

How will this compare to the radio image of Sag A* that we will see in the next day or two?

Also, if anyone knows, what are those spiky arcs sticking up, and those puff-ball things on the left?



Source: Gizmodo "The black hole at the centre of the Milky Way and filaments." Credit: SARAO, click for full size.
LaRosa et al 2000 present a 90 cm VLA image and catalog of sources near the galactic center.
Here is their schematic diagram with the 2&deg;x1&deg;, 18-33 cm band MeerKAT image region highlighted.



The compact source Sgr A* is a small dot within the bright, pear-shaped blob Sgr A right of center.
Recent millimeter VLBI images (Issaoun et al 2019) indicate a width on the order of 200 &mu;as, or 1/7000 of a pixel in the image you uploaded.

The bright pair of blobs left of center, Sgr B1 and Sgr B2, are massive molecular clouds.

Most of the bubble shapes are either supernova remnants (SNRs) or H II regions ionized by UV-bright young stars.
The far left pair Sgr D has one of each.

The various non-thermal filaments (NTFs) align with the local magnetic field and emit synchrotron radiation but are not well understood otherwise.
The bundle of filaments near the center of the image are known as the galactic center radio arc (GCRA) or just the Arc.