eROSITA-DE DR1 Main¶
The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019. Data Release 1 (DR1) presents X-ray catalogues, calibrated event files, source products, and all-sky maps from the first eROSITA All-Sky Survey (eRASS1), which spanned six months of operations from December 2019 to June 2020. This release comprises data covering the western Galactic hemisphere, the half-sky proprietary to the German eROSITA Consortium (eROSITA-DE).
The DR1 data is organized into 2447 sky tiles and provides source catalogues in two primary X-ray bands: a main catalogue from the most sensitive 0.2–2.3 keV energy range, and a hard catalogue from the 2.3–5.0 keV band.
The resultant eRASS1 main catalogue (0.2–2.3 keV) contains 930,203 entries (903,521 point-like and 26,682 extended sources) selected with a detection likelihood DET_LIKE_0 ≥ 6 (or EXT_LIKE > 0). A smaller catalogue of 5,466 sources is presented from the hard (2.3–5.0 keV) band, selected with DET_LIKE_3 ≥ 12. This eRASS1 main catalogue increases the number of known X-ray sources in the published literature by more than 60%.
Key performance metrics and survey characteristics include:
- Median Survey PSF HEW (0.2–2.3 keV): 30.0"
- Median Survey PSF HEW (2.3–5.0 keV): 34.4"
- Flux Limit (0.5–2 keV, 50% completeness): F(0.5–2 keV) > 5 × 10⁻¹⁴ erg s⁻¹ cm⁻²
- Absolute Flux Accuracy (0.5–2 keV): ~6% systematic uncertainty (relative to XMM-Newton)
- Astrometric Systematic Uncertainty: σ₀ = 0.9" ± 0.1" (based on Gaia/unWISE QSO cross-matching)
- Spurious Source Fraction (Main Cat.): ~14% (for DET_LIKE_0 ≥ 6)
- Spurious Source Fraction (Hard Cat.): ~8–10% (for DET_LIKE_3 ≥ 12)
- Resolved CXB Fraction (1–2 keV): ~19% (median value at the uniform flux limit)
Load using LSDB¶
>>> lsdb.open_catalog('https://linea.data.lsdb.io/hats/erosita')
Download with wget¶
$ wget -e robots=off -r -np -nH --cut-dirs=1 -c -R "index.html*" -l 0 https://linea.data.lsdb.io/hats/erosita/
Catalog metadata¶
| Number of rows | Number of columns | Number of partitions | Size on disk |
|---|---|---|---|
| 930,203 | 255 | 10 | 994 MB |