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
- 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
The Display link brings up the HLA interactive display, which allows
panning, zooming, changing the contrast, and overlaying some external
- 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.
Richard L. White, firstname.lastname@example.org
2019 April 16