Table A.1
Descriptions of the X-ray source catalog columns.
| Column | Units | Description |
|---|---|---|
| 1. Source properties and PSF-fitting results | ||
| Name | Source name | |
| UID | Unique source ID | |
| ID_SRC | Source ID in each field | |
| Field | Field name | |
| inMskPnt | bool | Whether in the point-source subsurvey region |
| RA_corr | deg | Right ascension, corrected using CatWISE2020 |
| DEC_corr | deg | Declination, corrected using CatWISE2020 |
| RADEC_ERR_corr | arcsec | Combined positional error, corrected |
| RA | deg | Right ascension (J2000), uncorrected |
| RA_LOWERR | arcsec | 1-σ RA lower error |
| RA_UPERR | arcsec | 1-σ RA upper error |
| DEC | deg | Declination (J2000), uncorrected |
| DEC_LOWERR | arcsec | 1-σ DEC lower error |
| DEC_UPERR | arcsec | 1-σ DEC upper error |
| RADEC_ERR | arcsec | Combined positional error, uncorrected |
| DET_LIKE_n | Detection likelihood for each detection band (n=1,2,3) or combining them (n=0) | |
| EXT | arcsec | Source extent parameter |
| EXT_err | arcsec | 1-σ Extent error |
| EXT_LIKE | Extent likelihood | |
| Exp | s | Unvignetted exposure time |
| galNHI | cm−2 | Galactic HI column density |
| galNH | cm−2 | Galactic total column density |
| ML_RATE_band | cts/s | Source count rate measured by PSF-fitting |
| ML_RATE_err_band | cts/s | 1-σ count rate error |
| ML_CTS_band | cts | Source net counts measured from count rate |
| ML_CTS_err_band | cts | 1-σ source counts error |
| ML_EXP_band | s | Vignetted exposure time at the source position |
| ML_BKG_band | cts/arcmin2 | Background at the source position |
| ML_EEF_band | s | PSF enclosed energy fraction in the fitting aperture |
| ECF_2d3_5_h | cm2/erg | Energy conversion factor between ML_FLUX_h and ML_RATE_t |
| ECF_0d5_2_s | cm2/erg | Energy conversion factor between ML_FLUX_s and ML_RATE_s |
| ECF_2d3_5 | cm2/erg | Energy conversion factor between ML_FLUX_3 and ML_RATE_3 |
| ECF_0d6_2d3 | cm2/erg | Energy conversion factor between ML_FLUX_2 and ML_RATE_2 |
| ECF_0d2_0d6 | cm2/erg | Energy conversion factor between ML_FLUX_1 and ML_RATE_1 |
| ML_FLUX_band | erg/cm2/s | Source flux corrected for Galactic absorption |
| ML_FLUX_err_band | erg/cm2/s | 1-σ source flux error |
| 2. Aperture photometry results in two Bands: s and t | ||
| APE_CTS_Band | cts | Total counts extracted within the aperture |
| APE_EXP_Band | s | Vignetted exposure time at the given position |
| APE_BKG_Band | cts | Background counts extracted within the aperture |
| APE_RADIUS_Band | pixels | Extraction radius |
| APE_POIS_Band | Poisson probability of the source being background fluctuation | |
| 3. Observed fluxes measured from spectra in five Bands: b1, b2, b3, b4, t | ||
| FluxObsv_Med_Band | erg/cm2/s | Observed fluxes, median |
| FluxObsv_Lo1_Band | erg/cm2/s | Observed fluxes, 1-σ lower limit |
| FluxObsv_Lo2_Band | erg/cm2/s | Observed fluxes, 2-σ lower limit |
| FluxObsv_Up1_Band | erg/cm2/s | Observed fluxes, 1-σ upper limit |
| FluxObsv_Up2_Band | erg/cm2/s | Observed fluxes, 2-σ upper limit |
Notes. The involved energy bands are listed in Table. A.2. In section 1, the PSF-fitting energy bands (band suffix) include three source-detection bands (1, 2, 3) and two forced-photometry bands (s, t). The count rate in the bands 1, 2, 3, s, and t are converted to Galactic-absorption-corrected flux in the bands 1, 2, 3, s, and h. The err suffix can be “LOWERR”, “UPERR”, or “ERR”, which correspond to 1-σ lower error, upper error, and combined error, respectively. The current version of the eSASS PSF-fitting task ermldet fails in estimating errors in a small fraction of cases, leaving an undefined value (NULL). ML_EXP_3 is not given, since it equals ML_EXP_t. In section 2, the aperture photometry is done in bands s and t. In section 3, the fluxes are measured from spectra in the band t and four bands b1-b4 used in the 4XMM catalog (Webb et al. 2020).
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