This page allows you to browse through the X-ray and optical properties (if any) of ChaMPlane X-ray sources. Browsing is based on Chandra Observation ID (obsid) and source ID (srcid). For searching ChaMPlane sources around a given sky position, try search by coordinate page. Source and field properties are organized in a tab-based text table format (RDB), which can be saved as it is. For easy browsing, one can sort the contents of the table by clicking on the column header The column header with dot (...) allows double column sorting.

Panels
There are four panels in the browsing page.

1. Top Panel
   The top panel lists the tables and files for the selected (from the left panel) ObsID along with the basic information about the observation such as the number of the detected sources exposure time, aim-point, instruments, list of the used CCD ID, the aimpoint in galactic coordinates and RA-Dec.
   1. [summary] : X-ray source detection summary table
   2. [images] : exposure map corrected smoothed X-ray images and region files for sources and FoV
   3. [astrometry]: astrometric information of X-ray sources given by wavdetect
   4. [photometry]: photometric information of X-ray sources given by aperture photometry
   5. [quantile] : X-ray quantile values of X-ray sources, a part of X-ray aperture photometry
   6. [flux_a] : Flux estimation based on 3-point quantile estimation
   7. [flux_b] : Flux estimation based on continuous quantile estimation
   8. [nH] : nH value estimation by various methods.
   9. [mosaic] : optical mosaic photometry data for counter part of X-ray sources (can have multiple counterparts)
   10. [spectra] : optical spectra and related information of the optical counterparts

2. Left Panel
   The left panel lists the properties of each Chandra observation along with corresponding Mosaic observation. See here for the column definition of the table.

3. Middle Panel
   The middle panel lists the table contents or related files for a selected information in the top panel. In the case of the table, one can choose a source ID to list all the available X-ray or optical information of the source. The spectra table lists links for the optical spectra, which can be viewed in the right panel.

4. Right Panel
   The right panel lists the proerpties of a select source such as X-ray or optical properties, or spectra, etc.

1. Source ID and source name
   The chandra sources in ChaMPlane can be uniquely addressed by their source ID (srcid). X-ray source ID is defined as XS + x-ray ObsID + energy band + CCD ID + source number. For example, XS02787B3_015 is the 15th source in CCD 3 of Obs. ID 2787 detected in B (Bx) band. The optical source ID (optid) is defined as OS + optical ObsID + source number. For example, OS001_0014482 is the 14482nd source of Obs. ID 1. The name convention of the ChaMPlane chandra source is CXOPS Jhhmmss.s+-ddmmss, and the prefix of optical source names is ChOPS J.

2. Source coordinates
   Two sets of coordinates are given for each source; one is before aspect correction and the other is after aspect correction. For example, in the source position table of "browsing by ObsID" mode, "ra" and "dec" columns are before aspect correction, and "ac_ra" and "ac_dec" columns are after aspect correction. This is true for "gl", "gb", "srcname", "ac_gl", "ac_gb", and "ac_srcname" columns. In "selecting sources by coordinates" mode, the user defined coordinates are matched against aspected corrected coordinates (ac_*).

3. Energy bands used in ChaMPlane
   

      Name	 Range
      Bx	0.3 - 8.0 keV : wavdetect band (also used as B)
      Sx	0.3 - 2.5 keV : wavdetect band (also used as S)
      Hx	2.5 - 8.0 keV : wavdetect band (also used as H)
   
      Bc	0.5 - 8.0 keV 
      Sc	0.5 - 2.0 keV
      Hc	2.0 - 8.0 keV
   
      Si	0.3 - 2.0 keV : Red for three color images
      Mi	2.0 - 4.0 keV : Green for three color images
      Hi	4.0 - 8.0 keV : Blue for three color images
   

4. Level
   A "level" is assigned to each source for confirming validity of the source and making the analysis convenient.

     Level ≥ 0: wavdetect
               everything detected by wavdetect
     Level ≥ 1: valid sources after V&V and source flag based cut
               flag ≠ 11x, 12x, 146
     Level ≥ 2: CCD selection
               sources in CCD 0, 1, 2, 3 for ACIS-I obs.
               sources in CCD 2, 3, 6, 7 for ACIS-S obs.
     Level ≥ 3: Off-axis limit
               sources within 400″ from the aimpoint for ACIS-I obs.
               sources in CCD 7 for ACIS-S obs.
   

5. Match
   The wavdetect is performed on the three bands (Sx, Hx, Bx) and it generates three list of sources for a given observation. One can cross-correlate source list among different bands or among multiple observations.

     XMatch ≥ 0: everything (level ≥ 1) detected by wavdetect in all three bands
   		and all the observations
     XMatch ≥ 1: unique source list from all three band detections
   		of each observation
     XMatch ≥ 2: unique source list from cross-correlating multiple
   		observations (level ≥ 2)
     XMatch ≥ 3: unique source list found in a longer observation 
   		with more significance
     XMatch ≥ 4: strong candidates for transients,
   		found in a shorter observation with more significance
   

6. Flag definition
   

    False sources by V&V
    	111 	False source by hot pixels or by bad bias values 
    	112 	False source by bad columns 
    	113 	False source due to readout streaks by a very strong source 
    	114 	False source by the FEP 0/3 problem
    	115 	Double source detected by the PSF effect
    	121 	Other spurious sources 
    Valid sources but source properties may be subject to a large uncertainty
    	141	Source region overlaps with neighbors' source regions 
    	142	No refinement on source region due to severe source region overlap 
    	143	Background region overlaps with neighbors' source regions
    	146	Source at the chip boundary 
    	147	Pile-up candidate (> 100 cts/ksec)	
    	148	Uncertain source position by flag = 115
    Other cases
    	151	Source is extended 
    	153	Target of the observation
    	154	Sources in the target region (e.g. point sources in a target cluster) 
    	157	The same source is found in other observations	
    	158	The same source is found in the stacked image
   

7. Flux estimation
   For each source in a given energy band, multiple flux estimations are given from a few spectral and extinction models.

      extinction models
   	nh1 : Drimmel et al. 2003, ApJ, 409, 205.
   		assume  NH/E(B-V) = 5.8×1021 cm-2/mag
   	nh2 : Schlegel et al. 1998, ApJ, 500, 525
   		assume  NH/A(V) = 1.79×1021 cm-2/mag
      spectral models
   	sp1 : Powerlaw 1.7
   	sp2 : Powerlaw 1.4
   

8. References
   

   Survey   Overview: Grindlay J. et al., 2005,  2005, ApJ, 635, 920 (astro-ph/0509781)
   X-ray    analysis: Hong, J. et al., 2005,  ApJ, 635, 907H (astro-ph/0509782) 
   Optical  analysis: Zhao, P. et al., 2005, ApJS, 161, 429 (astro-ph/0509785)
   Quantile analysis: Hong, J. et al., 2004, ApJ, 614, 508 (astro-ph/0406463)(software)