Contents
The main science story for this tutorial is Connecting Young Star Magnetospheres & Circumstellar Disks but one should also consider reading Quasars, Fermi, ALMA, oh my!: the underlying story is how do we discover and merge panchromatic data from different wavelength regimes to give us insight into underlying physical processes.
Questions
The goal of this part of the tutorial is to search the Chandra Source Catalog for sources near the Orion Nebula and retrieve their flux and positions. With this data you will then cross-correlate the sources to the 2MASS catalog with a 1 arcsec radius from each and retrieve their magnitudes. Using the merged catalog of X-ray and near-IR measurements we will look for a simple correlation in flux/magnitude.
The application starts in the Guide mode. Click on the Form icon to start building a query.
Click on Services and select Chandra Source Catalog (CSC) TAP Service. This opens the remote tables in the application.
Now you want to select the columns you wish to retain from this service. Open the master_source table in the Contents area on the left.
We will now build the query to find sources near the center of the Orion nebula and that are close to on-axis for Chandra.
In the Jobs window, once the job status shows as Pending hit Run.
When the status becomes Completed view the results and hit Save to save them in a file e.g. csc_orion.xml
Note
If your query fails to run you can continue this tutorial by downloading the csc_orion.xml file from here.
Return to the Query form and under Services select GAVO Data Center TAP Service
Hit Upload and upload the table of previously saved Chandra sources (e.g. csc_orion.xml) it will appear as TAP_UPLOAD.user_table in Contents.
From the GAVO tables select the twomass.data table and add the raj2000, dej2000, Jmag, Hmag and Kmag columns to the Output Columns.
Add a Position Search.
In the Jobs window hit run
When completed send results to TOPCAT
Question
What is the incidence of X-ray activity in different types of galaxies?
Approach
Find optical and X-ray emitting galaxies with redshift > .1 and study their X-ray and optical properties
Resources & Outline
Use the Chandra Source Catalog (CSC) TAP Service and the SDSS DR7 - SLoan Digital Sky Survey Data Release 7 services to extract the relevant X-ray and Optical Properties.
Analysis
Export the merged catalog to TOPCAT for visualization and analysis.
You can download the script seleste_independent_exercise.txt for doing this exercise off this website.