Lab3_archives - AST 4723 Lab 3: Data Archives and Image...

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AST 4723 Lab 3: Data Archives and Image Viewers Objective: The purpose of the lab this week is for you to learn how to acquire images from online archives, display images using a standard image viewer (ds9 in this case), and perform quick, first-look analysis of the images using IRAF. These skills will be directly relevant for the independent projects and subsequent labs. During this lab you will be downloading data from the HST archive and the ESO archive. Getting Started: 1. Open a web browser from your desktop 2. Using cygwin connect to siesta or one of the other department computers (same procedure as in previous labs). 3. On this computer, change directories to /astro/data/siesta1/users/ast4723/lab3. Create a new directory corresponding to your name or username and cd into this directory. Lab Instructions: 1. Creating an account with the ESO Archive The ESO archive contains data from the suite of ESO ground-based telescopes (including the four VLT telescopes, the NTT, the MPG-ESO 2.2m, the ESO 3.6m, and the APEX submm telescope), and also hosts a copy of the HST archive. The first thing that you have to do to use the ESO archive is register as an ESO archive user. a. Go to archive.eso.org. The top item on the lefthand menu should say “ESO User Portal”. Click on this link and then “User Portal Login”. From this window, then click “I would like to create a new account. b. Fill out the archive registration form. If given the option of choosing “Media Type”, select “FTP”. Once you have submitted the form, you should shortly receive an email confirming your account. We will return to the ESO archive later in this lab. 2. Downloading data from the ESO Archive The ESO Archive contains data from all ESO observatories, including the VLT, NTT (New Technology Telescope), and several smaller telescopes. For this part of the lab, the goal will be to retrieve ESO images for a specific object that you will be assigned during lab. Note that each person/team will have a different object for which they will be retrieving data. a. Go to the search page on the ESO site (under “ESO Data” on the menu) and perform a search for imaging of this target, requesting only images under the category “science”. b. Record in your notebook the instruments, exposure times, filters, and observation dates for the longest exposure and the longest exposure with a VLT instrument (if any). If there are multiple observations with the same maximum exposure time, pick one of them. Note that the observation date can be found as part of the “Dataset ID”.
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c. Select the frames with the longest exposure time (regardless of whether the data was taken with the VLT or another telescope), and request this data set. On the next screen you will be asked to select your output media. Choose
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This note was uploaded on 02/13/2012 for the course AST 4723 taught by Professor Anthony during the Fall '10 term at University of Florida.

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Lab3_archives - AST 4723 Lab 3: Data Archives and Image...

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