X-ray photometry
Full (0.5–7), soft (0.5–2) and hard (2–7 keV) bands.
Detection here uses PB < 0.01 at a supplied position, unlike the paper’s ΔC ≥ 25 criterion; this is not a blind source search.
Results
This position is within the central 3′ ICM region. Diffuse intracluster emission can bias the background estimate, affecting the flux, upper limit and detection significance.
The quoted intervals do not include this uncertainty. Contact Shouyi Wang at sywang0302@gmail.com for a dedicated analysis.
| Band / PB | Γ = 1.4 | Γ = 2.0 | Status | ||
|---|---|---|---|---|---|
| Flux / upper limit | Sensimap | Flux / upper limit | Sensimap (converted) | ||
Flux: erg cm−2 s−1. Detections: net-count flux [Gehrels 1σ bounds]. “<”: upper endpoint of the 90% Kraft–Burrows–Nousek interval. Background is treated as fixed; uncertainties are statistical only. Sensimap: nominal ΔC = 25 depth, not a measured upper limit.
Source: 1 R90 · Background: 1.7–5 R90Catalog full-band R90 (XID)Catalog mask
Counts & diagnostics
Method
Photometry. The default source radius is 1 full-band R90, with a 1.7–5 R90 background annulus. You can change these in Aperture & background; catalogued sources remain masked. Each band returns a flux for PB < 0.01 or a 90% upper limit otherwise. Photometry is rejected if the target R90 or selected source aperture overlaps a catalogued source’s R90. Errors follow Gehrels (1986); upper bounds follow Kraft et al. (1991).
Flux conversion. Counts are converted to flux using model-weighted CIAO exposure maps for power-law spectra with Γ = 1.4 and 2.0 and fixed Galactic absorption. Fluxes are corrected for aperture losses, but not for absorption.
Sensitivity. Sensimap reports the local survey sensitivity at ΔC = 25. Its Γ = 2 values are rescaled from the Γ = 1.4 map using the corresponding flux conversion. This survey depth differs from the 90% upper limit derived from the observed counts.
Tests at five positions show that our upper limits broadly agree with those from CIAO’s srcflux tool. For detailed extraction, response generation or spectral analysis, contact Shouyi Wang at sywang0302@gmail.com.
Citation & data
Please cite Wang et al. (2026), CLUES I: A 2 Ms Point-Source Catalog of the Abell 2744 Field when using this tool or the CLUES data products.
Catalog and data releases: CLUES on GitHub.