Data Model: table_1b

General Description
This table summarizes the basic X-ray parameters from the eRASS1 catalog for the UCD candidates from Reylé (2018) that are within 3× the uncertainty of the X-ray position.
Naming Convention
This file corresponds to the second part of Table 1 in the eROPub138 splash paper: A first eROSITA view of ultracool dwarfs (Stelzer+ 2021).
Filename: table_1b.fits
Approximate Size
16 KB
File Type
FITS
Generated by Product
eSASS (software used to generate the date product, add links)

Sections

Content of the page.

HDU0: PRIMARY

[Write text to summarize contents of this HDU]

HDU Type
IMAGE
HDU Size
2 KB
Header Table Caption for HDU0
KeyValueTypeComment

HDU1: votable

Data for the 72 UCD candidates from Reylé (2018).

HDU Type
BINARY TABLE
HDU Size
3 KB
Header Table Caption for HDU1
KeyValueTypeComment
Binary Table Caption for HDU1
NameTypeUnitDescription
source_id int64 None Gaia DR2 designation
ra_corr float64 deg Right ascension of the boresight corrected eRASS1 positions
dec_corr float64 deg Declination of the boresight corrected eRASS1 positions
delta_radec float32 arcsec Error on the eRASS1 positions
sep_ox float32 arcsec Separation between the proper motion corrected optical positions and the X-ray positions
rate float32 cts/s Broad band (0.2-5.0 keV) source count rates
err_rate float32 cts/s Error on the broad band (0.2-5.0 keV) source count rates
detml float32 None Maximum likelihood for the X-ray detection in the broad band (col. DET_LIKE_0 from eRASS1cat)
flag_uniq_ucd bool None Flag for UCDs being the unique Gaia counterparts to the eRASS1 source
flag_cpm bool None Flag for common proper motion pairs involving an UCD or UCD candidate
flag_xdata bool None Flag for objects with archival X-ray detections
flag_bona_fide_ucd bool None Flag for UCDs considered as ‘bona-fide’ counterparts to the eRASS1 sources
flag_plausible_ucd bool None Flag for UCDs considered as ‘plausible’ counterparts to the eRASS1 sources

References

Gaia Collaboration, Brown et al. 2018. Gaia Data Release 2. Summary of the contents and survey properties (Vizier catalog: I/345)

Reylé 2018. New ultra-cool and brown dwarf candidates in Gaia DR2 (Vizier catalog: J/A+A/619/L8)

Predehl et al. 2020. The eROSITA X-ray telescope on SRG

Acknowledgement

The eROSITA data model structure for catalogues was branched from the SDSS data model for value added catalogues.