eRASS1_clusters_optical.fitsContent of the page (HDU means "Header Data Unit" of a fits file).
empty HDU
This is the main content of the catalog.
| Name | Type | Unit | Description |
|---|---|---|---|
| NAME | char[23] | None | Cluster name |
| DETUID | char[32] | None | Unique eSASS detection ID |
| RA | float32[E4] | deg | Right Ascension J2000 of X-ray prior |
| DEC | float32[E5] | deg | Declination J2000 of X-ray prior |
| RADEC_ERR | float32[E2] | arcsec | Uncertainty of RA, DEC (arcsec) |
| RA_OPT | float32[E4] | deg | Right Ascension J2000 of optical center |
| DEC_OPT | float32[E5] | deg | Declination J2000 of optical center |
| RA_BCG | float32[E4] | deg | Right Ascension J2000 of the brightest member |
| DEC_BCG | float32[E5] | deg | Declination J2000 of the brightest member |
| REFMAG_BCG | float32[E3] | z mag | galactic extinction-corrected z-band AB magnitude of the brightest member |
| BEST_Z | float32[E5] | None | Best available cluster redshift |
| BEST_Z_ERR | float32[E5] | None | Error on best available cluster redshift |
| BEST_Z_TYPE | char[16] | None | Type of best available cluster redshift |
| Z_LAMBDA | float32[E5] | None | Uncorrected cluster photometric redshift |
| Z_LAMBDA_ERR | float32[E5] | None | Uncorrected cluster photometric redshift uncertainty |
| Z_LAMBDA_CORR | float32[E5] | None | Bias-corrected cluster photometric redshift |
| Z_LAMBDA_CORR_UERR | float32[E5] | None | Bias-corrected cluster photometric redshift upper error |
| Z_LAMBDA_CORR_LERR | float32[E5] | None | Bias-corrected cluster photometric redshift lower error |
| Z_LAMBDA_SECOND | float32[E5] | None | Uncorrected foreground/background cluster photometric redshift |
| LIT_Z | float32[E5] | None | Literature cluster redshift |
| LIT_Z_ERR | float32[E5] | None | Literature cluster redshift error |
| LIT_Z_SRC | char[32] | None | Reference for lit_z |
| SPEC_Z_BOOT | float32[E5] | None | Bootstrap estimate of biweight spectroscopic redshift |
| SPEC_Z_BOOT_ERR | float32[E5] | None | Bootstrap error on biweight spectroscopic redshift |
| N_MEMBERS | int32 | None | Number of members used in biweight redshift and velocity dispersion estimate |
| CG_SPEC_Z | float32[E5] | None | Spectroscopic redshift of the central galaxy |
| CG_SPEC_Z_ERR | float32[E5] | None | Error on spectroscopic redshift of the central galaxy |
| BCG_SPEC_Z | float32[E5] | None | Spectroscopic redshift of the brightest member |
| VDISP_BOOT | float32[E2] | km s-1 | Bootstrap estimate of velocity dispersion (km/s) |
| VDISP_BOOT_ERR | float32[E2] | km s-1 | Error on bootstrap estimate of velocity dispersion (km/s) |
| VDISP_BOOT_FLAG | float32[E2] | None | Fraction of diverged velocity clippings |
| VDISP_TYPE | char[8] | None | Estimate used to determine vdisp. Gapper or Biweight depending on number of members |
| LAMBDA_NORM | float32[E2] | None | Richness normalized to the the definition of the grz run |
| LAMBDA_NORM_ERR | float32[E2] | None | Richness error normalized to the definition of the grz run |
| LAMBDA_OPT_NORM | float32[E2] | None | Richness (optical center) normalized to the definition of the grz run |
| LAMBDA_OPT_NORM_ERR | float32[E2] | None | Richness (optical center) error normalized to the definition of the grz run |
| SCALEVAL | float32[E5] | None | Richness scale factor Eq. 2 of Rykoff 2016 |
| MASKFRAC | float32[E3] | None | Fraction of cluster area which is masked |
| RUN | char[128] | None | RedMaPPer calibration: survey_bands_refband_iteration |
| LMAX | float32[E4] | None | Optical maximum likelihood |
| NHI | float32[E5] | 1021 cm-2 | HI Column Desnsity (10^21 cm^-2) from HI4PI. Nside=1024 |
| EXT_LIKE | float32[E5] | None | Extent likelihood of the X-ray source |
| PCONT | float32[E4] | None | Probability that the cluster is a contaminant |
| SHARED_MEMBERS | bool | None | There is another cluster with >=70% of the same members and higher LMAX |
| IN_FOOTPRINT | bool | None | Cluster is within the optical survey footprint |
| LIMMAG_G | float32[E2] | g mag | Limiting g galaxy magnitude from Rykoff+15 depth (map) model |
| LIMMAG_R | float32[E2] | r mag | Limiting r galaxy magnitude from Rykoff+15 depth (map) model |
| LIMMAG_I | float32[E2] | i mag | Limiting i galaxy magnitude from Rykoff+15 depth (map) model |
| LIMMAG_Z | float32[E2] | z mag | Limiting z galaxy magnitude from Rykoff+15 depth (map) model |
| LIMMAG_W1 | float32[E2] | W1 mag | Limiting w1 galaxy magnitude from Rykoff+15 depth (map) model |
| IN_ZVLIM | bool | None | Photometric redshift is smaller than the limiting optical survey redshift ZVLIM_02 or ZVLIM_04 |
| ZVLIM_02 | float32[E3] | None | Maximum observable galaxy redshift at 0.2L* volume limit |
| ZVLIM_04 | float32[E3] | None | Maximum observable galaxy redshift at 0.4L* volume limit |
| GAIA_10MAG_30_ARCSEC | bool | None | A star in the GAIA eDR3 catalog brighter than 10 G mag is closer than 30 arcsec to the X-ray source |
| NGC_30_ARCSEC | bool | None | A galaxy in the NGC catalog is closer than 30 arcsec to the X-ray source |
| HECATE_30_ARCSEC | bool | None | A galaxy in the HECATE survey is closer than 30 arcsec to the X-ray source |
Kluge et al. (2024) Optical Identification and Properties of Galaxy Clusters and Groups in the Western Galactic Hemisphere
Bulbul et al. (2024) The first catalog of galaxy clusters and groups in the Western Galactic Hemisphere
Merloni et al. (2024) First X-ray catalogues and data release of the western Galactic hemisphere
Legacy Surveys The optical in near-infrared data used in this work
eRASS Cluster Inspector Interactive tool to inspect the cluster catalogs
This work is based on data from eROSITA, the soft X-ray instrument aboard SRG, a joint Russian-German science mission supported by the Russian Space Agency (Roskosmos), in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI), and the Deutsches Zentrum für Luft und Raumfahrt (DLR). The SRG spacecraft was built by Lavochkin Association (NPOL) and its subcontractors and is operated by NPOL with support from the Max Planck Institute for Extraterrestrial Physics (MPE). The development and construction of the eROSITA X-ray instrument was led by MPE, with contributions from the Dr. Karl Remeis Observatory Bamberg & ECAP (FAU Erlangen-Nuernberg), the University of Hamburg Observatory, the Leibniz Institute for Astrophysics Potsdam (AIP), and the Institute for Astronomy and Astrophysics of the University of Tübingen, with the support of DLR and the Max Planck Society. The Argelander Institute for Astronomy of the University of Bonn and the Ludwig Maximilians Universität Munich also participated in the science preparation for eROSITA. The eROSITA data shown here were processed using the eSASS software system developed by the German eROSITA consortium.
The Legacy Surveys consist of three individual and complementary projects: the Dark Energy Camera Legacy Survey (DECaLS; Proposal ID #2014B-0404; PIs: David Schlegel and Arjun Dey), the Beijing-Arizona Sky Survey (BASS; NOAO Prop. ID #2015A-0801; PIs: Zhou Xu and Xiaohui Fan), and the Mayall z-band Legacy Survey (MzLS; Prop. ID #2016A-0453; PI: Arjun Dey). DECaLS, BASS and MzLS together include data obtained, respectively, at the Blanco telescope, Cerro Tololo Inter-American Observatory, NSF’s NOIRLab; the Bok telescope, Steward Observatory, University of Arizona; and the Mayall telescope, Kitt Peak National Observatory, NOIRLab. Pipeline processing and analyses of the data were supported by NOIRLab and the Lawrence Berkeley National Laboratory (LBNL). The Legacy Survey team makes use of data products from the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), which is a project of the Jet Propulsion Laboratory/California Institute of Technology. NEOWISE is funded by the National Aeronautics and Space Administration.