CSC Master Sources Data Products
In addition to the tabulated properties for each detected source and observation in the Master Sources Table, Stacked Observation Detections Table, and Per-Observation Detections Table, a number of file-based Level 3 data products are produced for each source and observation individually, in formats suitable for analysis in CIAO. These include such things as:
- Bayesian blocks source properties
- Marginalized probability distribution functions for aperture photometry
- Convex hull polygon regions for extended sources
Master Source Level 3 Data Products
A set of master source data products is created for each identified source that undergoes catalog processing. They are identified by the master source name (name).
| Data product | Pipeline | Filename |
|---|---|---|
| Bayesian Blocks source properties | Source Properties | 〈m〉N〈v〉_blocks3.fits |
| Per-Master source region aperture photometry PDF | Source Properties | 〈m〉N〈v〉_〈b〉_phot3.fits |
| Per-Master extended source region polygons | Convex Hull | 〈m〉N〈v〉_poly3.fits |
How Do I Find These Data Products?
Master sources data products for one or more master sources can be retrieved using CSCview. They can be selected from the Data products pane in the Results tab of CSCview (see area highlighted in the figure), associated to one or more rows returned by the query, and by clicking on Search. The number of data products returned by CSCview as a function of the identifiers available in the rows select is determined as described in "CSCview and CSC 2.1 Help".
![[CSCView query results]](imgs/cscview_master_results.png)
Filename Example
〈m〉 refers to a Master Source name, formatted "2CXOJhhmmss{p|m}ddmmss", for example "2CXOJ0157505p374515", where "2CXO" refers the Second Chandra X-ray Observatory [Source Catalog] and "J0157505p374515N020" is the epoch J2000 celestial coordinates RA=1h 57m 50.5s and Dec=+37° 45′ 15″ or "2CXOJ0129152m734603" refers to the J2000 celestial coordinates RA=1h 29m 15.2s and Dec=-73° 46′ 3″. The "p" or "m" in the Master Source name refers to "+" or "-" source declination.
〈v〉 is a three digit data product revision number preceded by "N", N020 means file revision version 20. In the aperture photometry file, the _b_ refers to the "broad" science energy band.
The file name is ended with the data product type and appended with the gzipped FITS file extension .fits.gz, for example the Bayesian Blocks source properties file, 2CXOJ0129152m734603N020_blocks3.fits.gz, and the aperture photometry probability distribution function file, 2CXOJ0157505p374515N020_b_phot3.fits.gz.