README.md

Astro Scripts

Various astronomy scripts

1. Download DECalS Image Script: decal_image_download.py

   Downloading optical image from DeCALS survers (https://www.legacysurvey.org/decamls/)

   python decal_image_download.py <index> <ra> <dec> <name> <redshift> <fraction_size>

   • <redshift>: set value to 0 when you do not know the redshift
   • <fraction_size>: 1 = 2048px, 2 = 2048/2, 4 = 2048/4; (Increase to zoom in and reduce the file size)

   Example:
   Download jpeg: python decal_image_download.py 1 57.8554 -15.4054 test 0.2 4

   Download FITS file: python decal_image_download.py 1 57.8554 -15.4054 test 0.2 4 --fits

2. Download SDSS Catalog Data: download_SDSS_catalog_withSciServer.ipynb

   • This code can only be run on SciServer https://apps.sciserver.org/compute/, and cannot be run on your own machine.
   • To get access to the SciServer, You will have to create an account at https://apps.sciserver.org/login-portal/.
   • Please follow the installation steps in the Example-Notebooks to be able to run your own codes https://github.com/sciserver/Example-Notebooks#installation.
   • Once you create a persistent folder in /Storage/<username>/persistent/, upload this code to that folder. The script should work in this environment. Additional Information:
     • One of the main components of the code is using SQL to query the data we want. Here is a quick tutorial on how to use SQL: https://www.w3schools.com/sql/.
     • Description of each column in each SDSS Table can be found here https://skyserver.sdss.org/dr14/en/help/docs/tabledesc.aspx.