Properties of Convex-Hull Sources in CSC 2.0
Convex-hull sources - representing large, or irregular, X-ray sources that are much larger than the Chandra PSF - are new in release 2.0 of the CSC, and should be considered an alpha release. Only a small-number of the properties calculated for compact sources - given in the master source table - are calculated for convex-hull sources. The Convex-Hull pipeline page outlines the steps taken in calculating the properties and the following table lists these columns:
| Column name | Description |
|---|---|
| name | Source name in the format '2CXO Jhhmmss.s{+|-}ddmmss[X]' |
| ra | Source position, ICRS right ascension |
| dec | Source position, ICRS declination |
| err_ellipse_r0 | Major radius of the 95% confidence level position error ellipse |
| err_ellipse_r1 | Minor radius of the 95% confidence level position error ellipse |
| err_ellipse_ang | Position angle (ref. local true north) of the major axis of the 95% confidence level error ellipse |
| gal_b | Source position, Galactic latitude (equinox J2000.0, epoch J2000.0) |
| gal_l | Source position, Galactic longitude (equinox J2000.0, epoch J2000.0) |
| extent_flag | Source is extended, or deconvolved source extent is inconsistent with a point source at the 90% confidence level in one or more observations and energy bands |
| streak_src_flag | Source is located on an ACIS readout streak in all observations; source properties may be affected |
| man_add_flag | Source was manually added in the catalog via human review |
| man_inc_flag | Source was manually included in the catalog via human review (detection was rejected by automated criteria) |
| man_reg_flag | Source region parameters (dimensions, initial guess position input to the Maximum Likelihood Estimator fit) were manually modified via human review |
| man_match_flag | Source detections were manually matched between overlapping stacked observations via human review |
| man_pos_flag | Best fit source position was manually modified via human review |
| src_area_b | Area of the deconvolved source extent ellipse, or area of the source polygon for extended sources; ACIS broad (0.5-7.0 keV) energy band |
| src_area_h | Area of the deconvolved source extent ellipse, or area of the source polygon for extended sources; ACIS hard (2.0-7.0 keV) energy band |
| src_area_m | Area of the deconvolved source extent ellipse, or area of the source polygon for extended sources; ACIS medium (1.2-2.0 keV) energy band |
| src_area_s | Area of the deconvolved source extent ellipse, or area of the source polygon for extended sources; ACIS soft (0.5-1.2 keV) energy band |
| src_area_u | Area of the deconvolved source extent ellipse, or area of the source polygon for extended sources; ACIS ultrasoft (0.2-0.5 keV) energy band |
| phot_nsrcs | Number of sources fit simultaneously to compute aperture photometry quantities |
| photflux_aper_avg_b | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS broad (0.5-7.0 keV) energy band |
| photflux_aper_avg_h | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS hard (2.0-7.0 keV) energy band |
| photflux_aper_avg_m | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS medium (1.2-2.0 keV) energy band |
| photflux_aper_avg_s | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS soft (0.5-1.2 keV) energy band |
| photflux_aper_avg_u | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS ultrasoft (0.2-0.5 keV) energy band |
| photflux_aper_avg_lolim_b | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS broad (0.5-7.0 keV) energy band |
| photflux_aper_avg_lolim_h | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS hard (2.0-7.0 keV) energy band |
| photflux_aper_avg_lolim_m | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS medium (1.2-2.0 keV) energy band |
| photflux_aper_avg_lolim_s | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS soft (0.5-1.2 keV) energy band |
| photflux_aper_avg_lolim_u | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS ultrasoft (0.2-0.5 keV) energy band |
| photflux_aper_avg_hilim_b | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS broad (0.5-7.0 keV) energy band |
| photflux_aper_avg_hilim_h | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS hard (2.0-7.0 keV) energy band |
| photflux_aper_avg_hilim_m | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS medium (1.2-2.0 keV) energy band |
| photflux_aper_avg_hilim_s | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS soft (0.5-1.2 keV) energy band |
| photflux_aper_avg_hilim_u | Aperture-corrected net photon flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS ultrasoft (0.2-0.5 keV) energy band |
| flux_aper_avg_b | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS broad (0.5-7.0 keV) energy band |
| flux_aper_avg_h | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS hard (2.0-7.0 keV) energy band |
| flux_aper_avg_m | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS medium (1.2-2.0 keV) energy band |
| flux_aper_avg_s | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS soft (0.5-1.2 keV) energy band |
| flux_aper_avg_u | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS ultrasoft (0.2-0.5 keV) energy band |
| flux_aper_avg_lolim_b | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS broad (0.5-7.0 keV) energy band |
| flux_aper_avg_lolim_h | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS hard (2.0-7.0 keV) energy band |
| flux_aper_avg_lolim_m | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS medium (1.2-2.0 keV) energy band |
| flux_aper_avg_lolim_s | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS soft (0.5-1.2 keV) energy band |
| flux_aper_avg_lolim_u | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% lower confidence limit); ACIS ultrasoft (0.2-0.5 keV) energy band |
| flux_aper_avg_hilim_b | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS broad (0.5-7.0 keV) energy band |
| flux_aper_avg_hilim_h | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS hard (2.0-7.0 keV) energy band |
| flux_aper_avg_hilim_m | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS medium (1.2-2.0 keV) energy band |
| flux_aper_avg_hilim_s | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS soft (0.5-1.2 keV) energy band |
| flux_aper_avg_hilim_u | Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events (68% upper confidence limit); ACIS ultrasoft (0.2-0.5 keV) energy band |
| likelihood | Highest detection log likelihood across all stacked observations and energy bands |
| likelihood_class | Highest detection likelihood classification across all stacked observations and energy bands |
| significance | Highest flux significance (S/N) across all stacked observations and energy bands |
| nh_gal | Galactic N_H column density in direction of source |
| dither_warning_flag | Highest statistically significant peak in the power spectrum of the source region count rate occurs at the dither frequency or at a beat frequency of the dither frequency in one or more observations |
| acis_num | Total number of ACIS imaging observations contributing to the Master Sources Table record of the source |
| acis_hetg_num | Total number of ACIS/HETG observations contributing to the Master Sources Table record of the source |
| acis_letg_num | Total number of ACIS/LETG observations contributing to the Master Sources Table record of the source |
| acis_time | Total livetime for all ACIS imaging observations contributing to the Master Sources Table record of the source |
| hrc_num | Total number of HRC imaging observations contributing to the Master Sources Table record of the source |
| hrc_hetg_num | Total number of HRC/HETG observations contributing to the Master Sources Table record of the source |
| hrc_letg_num | Total number of HRC/LETG observations contributing to the Master Sources Table record of the source |