Data Products¶
Several data outputs are produced by caesar{} at the end of the processing if corresponding options are activated in the configuration file:
ROOT Output¶
If saveToFile option is enabled, a ROOT file is produced with different stored objects (depending on the activated options):
ROOT TTree (named SourceInfo) with caesar Source objects, containing summary parameters plus detailed information at pixel level (see Source API section);
ROOT TTree (named ConfigInfo) with a list of configuration options used in the run;
ROOT TTree (named PerformanceInfo) with a list of run parameters (runtimes at different stages, used memory, etc);
Input map, stored as a caesar Image object (see Image API section)
Background, noise and significance maps, stored as caesar Image objects (see Image API section)
Residual map, stored as a caesar Image object (see Image API section)
Segmentation and saliency maps, stored as a caesar Image object (see Image API section)
DS9 Output¶
If saveDS9Region option is enabled, two ds9 region files are produced with the list of catalogued source islands and fitted components, respectively reported as labeled polygon or ellipse regions, each with a series of tags assigned (e.g. compact/point-like vs extended, real vs spurious, etc).
Ascii Output¶
If saveToCatalogFile option is enabled, two tabular ascii files are produced with a series of summary parameters for each catalogued source islands and fitted components, respectively.
Table format for source islands is described below:
Col No. |
Name |
Unit |
Description |
---|---|---|---|
1 |
|
Source name assigned by finder |
|
2 |
|
Source name in IAU notation |
|
3 |
|
Number of pixels in island |
|
4 |
|
Number of fitted components (=0 if fit not performed or failed) |
|
5 |
|
Number of nested sources found in island |
|
6-7 |
|
Source x,y position |
|
8-9 |
|
Source x,y position weighted by pixel fluxes |
|
10-11 |
|
deg |
Source x,y sky position |
12-13 |
|
deg |
Source x,y sky position weighted by pixel fluxes |
14-15 |
|
Source pixel min, max x coord. |
|
16-17 |
|
Source pixel min, max y coord. |
|
18-19 |
|
deg |
Source pixel min, max x sky coord. |
20-21 |
|
deg |
Source pixel min, max y sky coord. |
22 |
|
GHz |
Frequency value extracted from image header |
23 |
|
Jy/beam |
Sum of island pixel brightness |
24 |
|
Jy/beam |
Max pixel brightness in island |
25-26 |
|
Jy/beam |
Source fitted flux brightness (not corrected by beam area) and its error |
27 |
|
Number of pixels in beam |
|
28 |
|
Jy/beam |
Background summed over island pixels |
29 |
|
Jy/beam |
Background noise summed over island pixels |
30 |
|
Source morph. flag {1=COMPACT,2=POINT-LIKE, 3=EXTENDED,4=COMPACT-EXTENDED} |
|
31 |
|
Sourceness flag{1=REAL,2=CANDIDATE,3=FAKE} |
|
32 |
|
Boolean flag indicating if source was tagged as good (true) or bad (false) in finding process |
|
33 |
|
Source depth level flag (nested source if >0) |
Table format for source components is described below:
Col No. |
Name |
Unit |
Description |
---|---|---|---|
1 |
|
Source name assigned by finder |
|
2 |
|
Number of pixels in island |
|
3 |
|
Component id |
|
4 |
|
Source name in IAU notation |
|
5-6 |
|
Component x,y position |
|
7-8 |
|
Component x,y position errors |
|
9-10 |
|
deg |
Component x,y sky position |
11-12 |
|
deg |
Component x,y sky position errors |
13 |
|
GHz |
Frequency value extracted from image header |
14-15 |
|
Jy/beam |
Component peak brightness and error |
16-17 |
|
Jy/beam |
Component brightness (not corrected by beam area) and error |
18-19 |
|
Jy/beam |
Island brightness (not corrected by beam area) and error |
20 |
|
Number of pixels in beam |
|
21-23 |
|
Component ellipse pars |
|
24-26 |
|
Component ellipse par errors |
|
27-29 |
|
“,”,deg |
Component ellipse pars in sky coords |
30-32 |
|
“,”,deg |
Component ellipse par errors in sky coords |
33-35 |
|
“,”,deg |
Beam ellipse pars in sky coords |
36-38 |
|
“,”,deg |
Component ellipse par in sky coords, deconvolved by beam |
39 |
|
Ratio of fitted and beam ellipse eccentricities |
|
40 |
|
Ratio of fitted and beam ellipse areas |
|
41 |
|
deg |
Rotation angle between fit and beam ellipse |
42 |
|
Jy/beam |
Background summed over island pixels |
43 |
|
Jy/beam |
Background noise summed over island pixels |
44-45 |
|
Source island fit chisquare and degrees of freedom |
|
46 |
|
Source fit quality flag {0=BAD,1=LOW,2=MEDIUM,3=HIGH} |
|
47 |
|
Component sourceness flag {1=REAL,2=CANDIDATE,3=FAKE} |
|
48 |
|
Component morph. flag {1=COMPACT,2=POINT-LIKE,3=EXTENDED, 4=COMPACT-EXTENDED} |
FITS Output¶
If saveToFITSFile option is enabled, a series of FITS image files are produced (if corresponding options are activated):
Input map
Background, noise and significance maps
Residual map
Saliency map