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ERASS1HARD - eROSITA All-Sky Survey (First 6 Months; eRASS1) Three-Band (2.3-5.0 keV) Source Catalog

 HEASARC
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Overview

The eROSITA telescope array aboard the Spektrum Roentgen Gamma (SRG) satellite began surveying the sky in December 2019, with the aim of producing all-sky X-ray source lists and sky maps of an unprecedented depth. The authors present catalogs of both point-like and extended sources using the data acquired in the first six months of survey operations (eRASS1; completed June 2020) over the half sky whose proprietary data rights lie with the German eROSITA Consortium.

This catalog contains all X-ray sources detected in the 2.3-5 keV band with detection likelihood > 12. The 5466 sources detected in the less sensitive but harder 2.3-5 keV band is the result of the first true imaging survey of the entire sky above 2 keV.

The eRASS1 main catalog, eRASS1MAIN, contains nearly 930000 entries detected in the most sensitive 0.2-2.3 keV energy range and the sources (only the strongly associated ones) from the main catalog have been linked to eRASS1MAIN in this catalog.

The reference paper presents methods to identify and flag potential spurious sources in the catalogs, which were applied for this work, and the authors tested and validated the astrometric accuracy via cross-comparison with other X-ray and multi-wavelength catalogs.

The catalogs form part of the first data release (DR1) of the SRG/eROSITA all-sky survey. Beyond the X-ray catalogs, DR1 contains all detected and calibrated event files, source products (light curves and spectra), and all-sky maps. The data files are linked to the table and also accessible from the HEASARC eROSITA and eROSITA-DE ERASS1 websites.

The catalog uses the following designation for indicating the bands for the different measurement: 

    Band              Energy range (keV)
    0                 0.2 - 5.0
    1		      0.2 - 0.6
    2		      0.6 - 2.3
    3		      2.3 - 5.0

Catalog Bibcode

2024A&A...682A..34M

References

The SRG/eROSITA all-sky survey, First X-ray catalogues and data release of
    the Western Galactic hemisphere. Merloni A., Lamer G., Liu T., Ramos-Ceja
    M.E., Brunner H. Bulbul E., Dennerl K., Doroshenko V., Freyberg M.J.,
    Friedrich S., Gatuzz E., Georgakakis A., Haberl F., Igo Z., Kreykenbohm
    I., Liu A., Maitra C., Malyali A., Mayer M.G.F., Nandra K., Predehl P.,
    Robrade J., Salvato M., Sanders J.S., Stewart I., Tubin-Arenas D., Weber
    P., Wilms J., Arcodia R., Artis E., Aschersleben J., Avakyan A., Aydar
    C., Bahar Y.E., Balzer F., Becker W., Berger K., Boller T., Bornemann W.,
    Brueggen M., Brusa M., Buchner J., Burwitz V., Camilloni F., Clerc N.,
    Comparat J., Coutinho D., Czesla S., Dannhauer S.M., Dauner L., Dauser
    T., Dietl J., Dolag K., Dwelly T., Egg K., Ehl E., Freund S., Friedrich
    P., Gaida R., Garrel C., Ghirardini V., Gokus A., Gruenwald G., Grandis
    S., Grotova I., Gruen D., Gueguen A., Haemmerich S., Hamaus N., Hasinger
    G., Haubner K., Homan D., Ider Chitham J., Joseph W.M., Joyce A., Koenig
    O., Kaltenbrunner D.M., Khokhriakova A., Kink W., Kirsch C., Kluge M.,
    Knies J., Krippendorf S., Krumpe M., Kurpas J., Li P., Liu Z., Locatelli
    N., Lorenz M., Mueller S., Magaudda E., Mannes C., McCall H., Meidinger
    N., Michailidis M., Migkas K., Munoz-Giraldo D., Musiimenta B.,
    Nguyen-Dang N.T., Ni Q., Olechowska A., Ota N., Pacaud F., Pasini T.,
    Perinati E., Pires A.M., Pommranz C., Ponti G., Poppenhaeger K.,
    Puehlhofer G., Rau A., Reh M., Reiprich T.H., Roster W., Saeedi S.,
    Santangelo A., Sasaki M., Schmitt J., Schneider P.C., Schrabback T.,
    Schuster N., Schwope A., Seppi R., Serim M.M., Shreeram S., Sokolova-Lapa
    E., Starck H., Stelzer B., Stierhof J., Suleimanov V., Tenzer C.,
    Traulsen I., Truemper J., Tsuge K., Urrutia T., Veronica A., Waddell
    S.G.H., Willer R., Wolf J., Yeung M.C.H., Zainab A., Zangrandi F., Zhang
    X., Zhang Y., Zheng X. <Astron. Astrophys. 682, A34 (2024)>
    =2024A&A...682A..34M (SIMBAD/NED BibCode)

Provenance

This database table was ingested by the HEASARC in June 2024 and is based upon the CDS Catalog J/A+A/682/A34 file erass1-h.dat. In some cases, the HEASARC has altered the original field names, as per HEASARC conventions, and provides the original field names in square brackets.

Parameters

Name
The eRASS1 source designation in the form '1eRASS JHHMMSS.s+DDMMSS', which uses the J2000.0 equatorial coordinates truncated to 0.1 arcseconds in RA and to 1 arcsecond in Declination. [IAUNAME]

Detuid
The unique detection identifier. [DETUID]

Skyfield_Number
The sky tile identification number. [SKYTILE]

Skyfield_Source_Number
The source identification number within each sky tile. The skyfield_number + skyfield_source_number identifies the corresponding source products. [ID_SRC]

Source_Number
The unique identification number for each source in this catalog. This number corresponds to 1011 + skyfield_number * 105 + skyfield_source_number. [UID]

Main_Source_Number
The identification number corresponding to source in the main eRASS1 (0.2-2.3 keV) catalog, eRASS1MAIN. The value is positive for a source with strong association, and negative value signifies a weak association with the listed source. The strong associations from the main catalog have been directly linked. [UID_1B]

Cluster_ID
The group identification of simultaneously fitted sources. [ID_CLUSTER]

RA
The astrometrically-corrected right ascension for the source in the selected equinox. This was given in J2000 decimal degree coordinates to an accuracy of 10-5 degrees (0.036 arcseconds) in the original reference. [RA]

Dec
The astrometrically-corrected declination of the source in the selected equinox. This was given in J2000 decimal degree coordinates to an accuracy of 10-6 degrees (0.0036 arcseconds) in the original reference. [DEC]

LII
The galactic longitude of the source, based on the corrected right ascension and declination. Note that the original catalog values provide the galactic coordinates based on the raw (uncorrected) coordinates which have been found to be faulty and therefore, the authors suggest using the corrected values, as is provided in this catalog. [LII]

BII
The galactic latitude of the source. Note that the original catalog values provide the galactic coordinates based on the raw (uncorrected) coordinates which have been found to be faulty and therefore, the authors suggest using the corrected values, as is provided in this catalog. [BII]

RA_Raw
The uncorrected right ascension of the source. [RA_RAW]

Dec_Raw
The uncorrected declination of the source. [DEC_RAW]

RA_Neg_Err
The 1-sigma lower uncertainty for right ascension. [RA_LOWERR]

RA_Pos_Err
The 1-sigma upper uncertainty for right ascension. [RA_UPERR]

Dec_Neg_Err
The 1-sigma lower uncertainty for declination. [DEC_LOWERR]

Dec_Pos_Err
The 1-sigma upper uncertainty for declination. [DEC_UPERR]

Error_Radius
The 1-sigma positional uncertainty. [POS_ERR]

Error_Radius_Raw
The combined positional error, based on PSF-fitting from the uncorrected source position. [RADEC_ERR]

Time_Onaxis
The date/time corresponding to the date of the observation, based on the source nearest to the optical axis of the telescope. [MJD]

Time
The date/time corresponding to the first observation of the source. [MJD_MIN]

End_Time
The date/time corresponding to the last observation of the source. [MJD_MAX]

Source_Extent
The source extent parameter, given in arcseconds. [EXT]

Source_Extent_Error
The 1-sigma uncertainty in the source extent parameter, given in arcseconds. [EXT_ERR]

Source_Extent_Neg_Err
The 1-sigma lower uncertainty measurement in the source extent parameter. [EXT_LOWERR]

Source_Extent_Pos_Err
The 1-sigma upper uncertainty measurement in the source extent parameter. [EXT_UPERR]

Extent_Likelihood
The likelihood associated with the extent measurement. [EXT_LIKE]

B0_Counts
The background-subtracted 0.2-5.0 keV net counts for the source, measured from the count_rate. [ML_CTS_0]

B0_Counts_Error
The combined 1-sigma uncertainty in the 0.2-5.0 keV net counts. [ML_CTS_ERR_0]

B0_Count_Rate
The net count rate for the source in the 0.2-5.0 keV band, based on PSF-fitting. [ML_RATE_0]

B0_Count_Rate_Error
The combined 1-sigma uncertainty in the 0.2-5.0 keV net count rate. [ML_RATE_ERR_0]

B0_Flux
The flux of the source in the 0.2-5.0 keV band, in units of erg/s/cm2. The energy conversion factor (ECF; listed in Table 3 of the reference paper) between the count rates and fluxes is based on a power-law model with Gamma=2.0 and the total Galactic absorption column density at source position. [ML_FLUX_0]

B0_Flux_Error
The 1-sigma uncertainty in the 0.2-5.0 keV flux, in units of erg/s/cm2. [ML_FLUX_ERR_0]

B0_Detect_Likelihood

B0_Bkg_Counts
The background counts, in units of counts/arcmin2, at the source position in the 0.2-5.0 keV band. [ML_BKG_0]

B1_Counts
The background-subtracted 0.2-0.6 keV net counts for the source, measured from the count_rate. [ML_CTS_1]

B1_Counts_Error
The combined 1-sigma uncertainty in the 0.2-0.6 keV net counts. [ML_CTS_ERR_1]

B1_Counts_Neg_Err
The 1-sigma lower uncertainty in the 0.2-0.6 keV net counts. [ML_CTS_LOWERR_1]

B1_Count_Pos_Err
The 1-sigma upper uncertainty in the 0.2-0.6 keV net counts. [ML_CTS_UPERR_1]

B1_Count_Rate
The net count rate for the source in the 0.2-0.6 keV band, based on PSF-fitting. [ML_RATE_1]

B1_Count_Rate_Error
The combined 1-sigma uncertainty in the 0.2-0.6 keV net count rate. [ML_RATE_ERR_1]

B1_Count_Rate_Neg_Err
The 1-sigma lower uncertainty in the 0.2-0.6 keV net count rate. [ML_RATE_LOWERR_1]

B1_Count_Rate_Pos_Err
The 1-sigma upper uncertainty in the 0.2-0.6 keV net count rate. [ML_RATE_UPERR_1]

B1_Flux
The flux of the source in the 0.2-0.6 keV band, in units of erg/s/cm2. The energy conversion factor (ECF; listed in Table 3 of the reference paper) between the count rates and fluxes is based on a power-law model with Gamma=2.0 and the total Galactic absorption column density at source position. [ML_FLUX_1]

B1_Flux_Error
The 1-sigma uncertainty in the 0.2-0.6 keV flux, in units of erg/s/cm2. [ML_FLUX_ERR_1]

B1_Flux_Neg_Err
The 1-sigma lower uncertainty in the 0.2-0.6 keV flux, in units of erg/s/cm2. [ML_FLUX_LOWERR_1]

B1_Flux_Pos_Err
The 1-sigma upper uncertainty in the 0.2-0.6 keV flux, in units of erg/s/cm2. [ML_FLUX_UPERR_1]

B1_Detect_Likelihood
The detection likelihood in 0.2-0.6 keV band, based on PSF-fitting. [DET_LIKE_1]

B1_Bkg_Counts
The background counts, in units of counts/arcmin2, at the source position in the 0.2-0.6 keV band. [ML_BKG_1]

B1_Exposure
The vignetting-corrected exposure, in seconds, at the source position. [ML_EXP_1]

B1_EEF
The enclosed energy fraction in the 0.2-0.6keV band. [ML_EEF_1]

B1_Aperture_Counts
The total raw counts extracted within the aperture in the 0.2-0.6 keV band. [APE_CTS_1]

B1_Aperture_Bkg_Counts
The background counts expected within the aperture in 0.2-0.6 keV band, excluding nearby sources using the source map. [APE_BKG_1]

B1_Aperture_Exposure
The exposure map value in 0.2-0.6 keV band at the given position of the source. [APE_EXP_1]

B1_Aperture_Radius
The extraction radius in pixels in the 0.2-0.6 keV band. The aperture is chosen as a fixed one at 75% of the encircled energy fraction. [APE_RADIUS_1]

B1_Aperture_Prob
The Poisson probability that the observed 0.2-0.6 keV counts within the aperture are produced by random fluctuations of the background. Lower values mean lower chance that background fluctuations are cause for the observed counts and therefore the source is more likely to be an astrophysical source. [APE_POIS_1]

B2_Counts
The background-subtracted 0.6-2.3 keV net counts for the source, measured from the count_rate. [ML_CTS_2]

B2_Counts_Error
The combined 1-sigma uncertainty in the 0.6-2.3 keV net counts. [ML_CTS_ERR_2]

B2_Counts_Neg_Err
The 1-sigma lower uncertainty in the 0.6-2.3 keV net counts. [ML_CTS_LOWERR_2]

B2_Count_Pos_Err
The 1-sigma upper uncertainty in the 0.6-2.3 keV net counts. [ML_CTS_UPERR_2]

B2_Count_Rate
The net count rate for the source in the 0.6-2.3 keV band, based on PSF-fitting. [ML_RATE_2]

B2_Count_Rate_Error
The combined 1-sigma uncertainty in the 0.6-2.3 keV net count rate. [ML_RATE_ERR_2]

B2_Count_Rate_Neg_Err
The 1-sigma lower uncertainty in the 0.6-2.3 keV net count rate. [ML_RATE_LOWERR_2]

B2_Count_Rate_Pos_Err
The 1-sigma upper uncertainty in the 0.6-2.3 keV net count rate. [ML_RATE_UPERR_2]

B2_Flux
The flux of the source in the 0.6-2.3 keV band, in units of erg/s/cm2. The energy conversion factor (ECF; listed in Table 3 of the reference paper) between the count rates and fluxes is based on a power-law model with Gamma=2.0 and the total Galactic absorption column density at source position. [ML_FLUX_2]

B2_Flux_Error
The 1-sigma uncertainty in the 0.6-2.3 keV flux, in units of erg/s/cm2. [ML_FLUX_ERR_2]

B2_Flux_Neg_Err
The 1-sigma lower uncertainty in the 0.6-2.3 keV flux, in units of erg/s/cm2. [ML_FLUX_LOWERR_2]

B2_Flux_Pos_Err
The 1-sigma upper uncertainty in the 0.6-2.3 keV flux, in units of erg/s/cm2. [ML_FLUX_UPERR_2]

B2_Detect_Likelihood
The detection likelihood in 0.6-2.3 keV band, based on PSF-fitting. [DET_LIKE_2]

B2_Bkg_Counts
The background counts, in units of counts/arcmin2, at the source position in the 0.6-2.3 keV band. [ML_BKG_2]

B2_Exposure
The vignetting-corrected exposure, in seconds, at the source position. [ML_EXP_2]

B2_EEF
The enclosed energy fraction in the 0.6-2.3keV band. [ML_EEF_2]

B2_Aperture_Counts
The total raw counts extracted within the aperture in the 0.6-2.3 keV band. [APE_CTS_2]

B2_Aperture_Bkg_Counts
The background counts expected within the aperture in 0.6-2.3 keV band, excluding nearby sources using the source map. [APE_BKG_2]

B2_Aperture_Exposure
The exposure map value in 0.6-2.3 keV band at the given position of the source. [APE_EXP_2]

B2_Aperture_Radius
The extraction radius in pixels in the 0.6-2.3 keV band. The aperture is chosen as a fixed one at 75% of the encircled energy fraction. [APE_RADIUS_2]

B2_Aperture_Prob
The Poisson probability that the observed 0.6-2.3 keV counts within the aperture are produced by random fluctuations of the background. Lower values mean lower chance that background fluctuations are cause for the observed counts and therefore the source is more likely to be an astrophysical source. [APE_POIS_2]

B3_Counts
The background-subtracted 2.3-5.0 keV net counts for the source, measured from the count_rate. [ML_CTS_3]

B3_Counts_Error
The combined 1-sigma uncertainty in the 2.3-5.0 keV net counts. [ML_CTS_ERR_3]

B3_Counts_Neg_Err
The 1-sigma lower uncertainty in the 2.3-5.0 keV net counts. [ML_CTS_LOWERR_3]

B3_Count_Pos_Err
The 1-sigma upper uncertainty in the 2.3-5.0 keV net counts. [ML_CTS_UPERR_3]

B3_Count_Rate
The net count rate for the source in the 2.3-5.0 keV band, based on PSF-fitting. [ML_RATE_3]

B3_Count_Rate_Error
The combined 1-sigma uncertainty in the 2.3-5.0 keV net count rate. [ML_RATE_ERR_3]

B3_Count_Rate_Neg_Err
The 1-sigma lower uncertainty in the 2.3-5.0 keV net count rate. [ML_RATE_LOWERR_3]

B3_Count_Rate_Pos_Err
The 1-sigma upper uncertainty in the 2.3-5.0 keV net count rate. [ML_RATE_UPERR_3]

B3_Flux
The flux of the source in the 2.3-5.0 keV band, in units of erg/s/cm2. The energy conversion factor (ECF; listed in Table 3 of the reference paper) between the count rates and fluxes is based on a power-law model with Gamma=2.0 and the total Galactic absorption column density at source position. [ML_FLUX_3]

B3_Flux_Error
The 1-sigma uncertainty in the 2.3-5.0 keV flux, in units of erg/s/cm2. [ML_FLUX_ERR_3]

B3_Flux_Neg_Err
The 1-sigma lower uncertainty in the 2.3-5.0 keV flux, in units of erg/s/cm2. [ML_FLUX_LOWERR_3]

B3_Flux_Pos_Err
The 1-sigma upper uncertainty in the 2.3-5.0 keV flux, in units of erg/s/cm2. [ML_FLUX_UPERR_3]

B3_Detect_Likelihood
The detection likelihood in 2.3-5.0 keV band, based on PSF-fitting. This catalog includes sources with b3_detect_likelihood >= 12. [DET_LIKE_3]

B3_Bkg_Counts
The background counts, in units of counts/arcmin2, at the source position in the 2.3-5.0 keV band. [ML_BKG_3]

B3_Exposure
The vignetting-corrected exposure, in seconds, at the source position. [ML_EXP_3]

B3_EEF
The enclosed energy fraction in the 2.3-5.0keV band. [ML_EEF_3]

B3_Aperture_Counts
The total raw counts extracted within the aperture in the 2.3-5.0 keV band. [APE_CTS_3]

B3_Aperture_Bkg_Counts
The background counts expected within the aperture in 2.3-5.0 keV band, excluding nearby sources using the source map. [APE_BKG_3]

B3_Aperture_Exposure
The exposure map value in 2.3-5.0 keV band at the given position of the source. [APE_EXP_3]

B3_Aperture_Radius
The extraction radius in pixels in the 2.3-5.0 keV band. The aperture is chosen as a fixed one at 75% of the encircled energy fraction. [APE_RADIUS_3]

B3_Aperture_Prob
The Poisson probability that the observed 2.3-5.0 keV counts within the aperture are produced by random fluctuations of the background. Lower values mean lower chance that background fluctuations are cause for the observed counts and therefore the source is more likely to be an astrophysical source. [APE_POIS_3]

Srcpos_SNR_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source may lie within an overdense region near supernova remnant. [FLAG_SP_SNR]

Srcpos_Bps_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source may lie within an overdense region near bright source. [FLAG_SP_BPS]

Srcpos_Scl_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source may lie within an overdense region near stellar cluster. [FLAG_SP_SCL]

Srcpos_Lga_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source may lie within an overdense region near local large galaxy. [FLAG_SP_LGA]

Srcpos_GC_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source may lie within an overdense region near galaxy cluster. [FLAG_SP_GC_CONS]

No_RADec_Err_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source contained no position uncertainty in the pre-processed version of this catalog. FLAG_NO_RADEC_ERR]

No_Ext_Err_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source contained no extent error in the pre-processed version of this catalog. [FLAG_NO_EXT_ERR]

No_Cts_Err_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source contained no counts error in the pre-processed version of this catalog. [FLAG_NO_CTS_ERR]

Optical_Flag
Boolean flag (possible files of 0 or 1) which indicates that the source is matched within 15-arcsec of a bright optical star and may be contaminated by optical loading. [FLAG_OPT]

Contact Person

Questions regarding the ERASS1HARD database table can be addressed to the HEASARC Help Desk.
Page Author: Browse Software Development Team
Last Modified: Thursday, 19-Sep-2024 13:37:15 EDT