M33 0.75x0.75 deg combined 6cm+20cm (2016 July 31)

Display notes

• You can change the Display size of the displayed image (2700 is full resolution with 1 arcsec pixels). Click the Blink frames button to blink between images. It cycles through all the images that have the "Include in blink" column checked. The FITS links allow downloading the images (and note that there are links above for the catalog). The Display link brings up the HLA interactive display, which allows panning, zooming, changing the contrast, and overlaying some external catalogs.
• Click boxes from the Overlays to show graphical overlays for the radio detection islands, Knox's SNR catalog, and the radio catalog from these images. You can also use the keystroke commands i=Islands, s=SNRs, and c=catalog to toggle the visibility of these overlays. You can also type b=blink to start or stop blinking. That makes it easy to turn them on and off even if you have scrolled down to the middle of the image and can't see the checkboxes.
• The islands show the regions used for source fitting. Red islands have source entries in the catalog; green islands either are too faint (less than 4-sigma or failed in fitting, usually because the region was crowded. The source-subtracted image has Gaussian source models from the catalog subtracted and can be used to identify sources where the Gaussian fits are poor.
• The DSS and Subaru images are matched optical images. There is clearly excellent agreement in the optical and radio morphologies for H II regions. I noticed one region southwest of the nucleus where there is a misaligned patch in the Subaru mosaic; in general the DSS astrometry is more trustworthy than the Subaru astrometry where they disagree.