(Analysis -> Image Serves -> ESO DSS I/II)īut DS9 scales these images arbitrarily. Here I've imported the galaxy in the optical from the DSS II Blue I've adjusted another image (right) to only show color structure over a short range, giving enhanced contrast.īut you can do more than just use DS9 as a poor substitute for Photoshop!īecause FITS files can contain coordinate information, We can import images from other surveys of the same object.ĭS9 comes with several image servers across several wavelengths: the DSS, 2MASS, FIRST. The Scale menu lets you change how the color table is mapped to different pixel values. Here's the lovely cubehelix-1 rainbow (left). Switch between different color table (or import your own). There is a colorbar at the bottom of the image, helpfully letting you know what values are mapped to what colors.ĭS9 gives you many options to display your image.You can see the right ascension and declination beside the fk5 entry. If you have a FITS file, the coordinate system is probably implanted in the image date.As you mouse over the image, the Value entry at the top lets you know the value of that particular pixel.This is a combination of a poor subtraction of the continuum source (in the lower right) and either an error in calibrating the amplitudes or the phases. This moment map is pretty bad: you can see significant ripples throughout the image. Here is my moment 0 map, after loading it in (you can right-click and drag to adjust the contrast, as I've done). The 2D image is just the zeroeth moment of the 3D data cube (where all the flux has been summed up across each channel). This data is my EVLA observations of the HI line emission of galaxy AGC9037. I'm going to give several examples of things that can be done with DS9 with both a 2D image and 3D data cube (both can be found in /home/hatillo/ghallenbeck/misc/). It's very useful for quickly making images for your own use, or for making very pretty images for publication.
SAOIMAGE DS9 STANDS FOR SOFTWARE
DS9 is software for imaging and visualizing both 2-dimensional images and multi-dimensional data cubes, and is aimed at astronomers.
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