M33 JVLA Radio Survey 1.4 GHz and 5 GHz 1x1 deg (2019 March 4)

This web page includes links to data from the paper "A New, Deep JVLA Radio Survey of M33" by White, Long, Becker, Blair, Helfand & Winkler (2019, ApJS, 241, 37). The page provides access to ASCII machine-readable tables, FITS tables, FITS images, and image cutouts from our radio survey as well as some other associated data on M33.

See the paper and the catalog description for details on the images and the catalog. There is a radio catalog (creating by doing source detection on our radio images) and also forced photometry catalogs for SNRs and X-ray sources (created by integrating the radio data over the elliptical or circular regions for the sources.) This page also provides a simple interactive viewer for the radio and other images and for the catalogs.

The M33 image cutout server provides an easy way to examine the radio, H-alpha, X-ray, etc. images at a particular position or at a list of positions.

Display notes

• You can change the Display size of the displayed image (3869 is full resolution with 1 arcsec pixels) either by clicking on the size buttons or by using the + and - keys. 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 and the "island" maps that show the locations of sources). 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, the combined SNR catalog from Long et al. (2010) and Lee & Lee (2014), and the Tuellmann et al. (2011) X-ray catalog. The first row plots the actual boundaries of the islands, while the second row just plots (larger) circles at the source positions. You can toggle the visibility of these overlays using the keystroke commands r=Radio Islands, s=SNRs, and x=X-ray sources. The correponding keystrokes for the catalogs are c, t, and y. 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 radio islands show the regions used for radio source fitting. Red islands have source entries in the catalog; yellow islands either are too faint (less than 4-sigma) or failed in fitting, usually because the region was crowded.
• The DSS and Subaru images are matched optical images. There is clearly excellent agreement in the optical and radio morphologies for H II regions. One region southwest of the nucleus has a misaligned patch in the Subaru mosaic; in general the DSS astrometry is more trustworthy than the Subaru astrometry where they disagree.