All names should have an "S" at the end of them this stands for scaled and "A" is for aligned.Ħ. Open up Aligned.list and add "A" at the end of all file names. Obviously, update this line for whatever field/filter with which you're working.ĥ. Enter: ls /data/photometry/GALAXY/TELESCOPE/FILTER/*A.fit > ToAlign.list. Go back and redo those photometry steps.Ĥ. It usually means that you accidentally hit spacebar on the wrong star during phot, or you spacebar'd the stars in the wrong order. If the grid becomes askew (you'll know), or if the plus signs suddenly move around, something's wrong. The small plus signs should stay in relatively the same place, and the grid of lines should remain basically horizontal and vertical. IMPORTANT!! Watch carefully as the Textronic window cycles through the images. Hit "q" in the Textronic window to cycle through all the images. Enter into iraf: geomap Coordinates.list 1 xpix 1 ypix where x/ypix are the size of your image. Enter into a terminal: ls *.txt > ToCoordinates.listģ. Change to the galaxies/GALAXY/TELESCOPE/FILTER/ direcotry.Ģ. The following steps will align your images around the center image you chose.ġ. These pixel values will be used by an IRAF task to shift each image to that of the center image. This program also create *.txt files in the "galaxies/GALAXY/TELESCOPE/FILTER/ directory with the center and image pixel values of all 5 stars from the photometry steps. ![]() Copy and paste into an IRAF terminal for the directory /data/stack/. This program creates a file called "scale.cl" which has IRAF scripts to scale the images for the appropriate airmass. For each galaxy/filter combination the location of the center.mag.1 file will indicate the beginning of a new galaxy/filter/ set of individual *.mag.1 files: Add the new image's *.mag.1 to the file called image.list (or generate a brand new one). I will explain here, in greater detail, the procedures.Ĭorrect for Airmass and Setup Files for Aligning the imagesġ. The file stack.txt contains an overview of the steps involved in stacking, for quick reference later. Stacking, in short, consists of aligning and literally stacking images of like fields on top of one another to increase flux and depth. Additional funding was provided by the JWST Mission office at Space Telescope Science Institute to improve capabilities for 3-D data visualization.After reducing, calibrating, and performing photometry on data, we are finally able to stack. ![]() SAOImageDS9 development has been made possible by funding from the Chandra X-ray Science Center (CXC) and the High Energy Astrophysics Science Archive Center (HEASARC). GUI elements such as the coordinate display, panner, magnifier, horizontal and vertical graphs, button bar, and color bar can be configured via menus or the command line. All versions and platforms support a consistent set of GUI and functional capabilities.ĭS9 supports advanced features such as 2-D, 3-D and RGB frame buffers, mosaic images, tiling, blinking, geometric markers, colormap manipulation, scaling, arbitrary zoom, cropping, rotation, pan, and a variety of coordinate systems. It requires no installation or support files. It provides for easy communication with external analysis tasks and is highly configurable and extensible via XPA and SAMP.ĭS9 is a stand-alone application. DS9 supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps. ![]() SAOImageDS9 is an astronomical imaging and data visualization application.
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