Data Model: table_1a

General Description
This table summarizes the basic X-ray parameters from the eRASS1 catalog for the UCDs from GagnéM that are within 3× the uncertainty of the X-ray position.
Naming Convention
This file corresponds to the first part of Table 1 in the eROPub138 splash paper: A first eROSITA view of ultracool dwarfs (Stelzer+ 2021).
Filename: table_1a.fits
Approximate Size
14 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 24 GagnéM UCDs.

HDU Type
BINARY TABLE
HDU Size
1 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

GagnéM refers to the online database of "M6- M9 dwarfs" maintained by J. Gagné.

Gaia Collaboration, Brown et al. 2018. Gaia Data Release 2. Summary of the contents and survey properties (Vizier catalog: Gaia DR2 : I/345)

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.