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RIXOS - ROSAT International X-Ray/Optical Survey Source Catalog |
HEASARC Archive |
This table contains the catalog of the RIXOS sources and their optical identifications.
The ROSAT International X-ray/Optical Survey (RIXOS): source catalogue Mason K.O., Carrera F.J., Hasinger G., Andernach H., Aragon-Salamanca A., Barcons X., Bower R., Brandt W.N., Branduardi-Raymont G., Burgos-Martin J., Cabrera-Guerra F., Carballo R., Castander F., Ellis R.S., Gonzalez-Serrano J.I., Martinez-Gonzalez E., Martin-Mirones J.M., McMahon R.G., Mittaz J.P.D., Nicholson K.L., Page M.J., Perez-Fournon I., Puchnarewicz E.M., Romero-Colmenero E., Schwope A.D., Vila B., Watson M.G., Wonnacott D. <Mon. Not. R. Astron. Soc. 311, 456 (2000)> =2000MNRAS.311..456M (SIMBAD/NED BibCode)
Name
The ROSAT X-ray source designation, derived from the J2000 equatorial
coordinates of the X-ray centroid.
Opt_ID
Most of the RIXOS X-ray sources have information on only a
single optical counterpart, but there are 8 cases where there are two
optical counterparts listed. The HEASARC has created this parameter to
flag the second counterparts in these cases with a value of 2, compared
to the default value of 1.
Error_Radius
The X-ray 90% confidence positional radius in arcseconds.
RA
The Right Ascension of the optical counterpart, if it is a single
object, or of the X-ray centroid, if it is a cluster or an unidentified
source, in the selected equinox. This was given in J2000 coordinates and
to a precision of 0.01 seconds of time in the original table.
Dec
The Declination of the optical counterpart, if it is a single
object, or of the X-ray centroid, if it is a cluster or an unidentified
source, in the selected equinox. This was given in J2000 coordinates and
to a precision of 0.1 arcseconds in the original table.
LII
The Galactic Longitude of the RIXOS object.
BII
The Galactic Latitude of the RIXOS object.
Flux
The X-ray flux (0.5-2.0 keV) of the ROSAT source, in erg/s/cm2,
derived from the measured count rate assuming a spectral slope of alpha
= -1. This is the flux which has been used to define membership in the
catalog.
Flux_Unabs
The X-ray flux (0.5-2.0 keV) of the ROSAT source, in erg/s/cm2,
derived from the best-fitting spectral slope and (with the exception of
stellar IDs) after correcting for Galactic absorption.
Count_Rate
The X-ray count rate, in ct/s.
Count_Rate_Error
The RMS uncertainty in the X-ray count rate,
in ct/s.
ML_Counts
The total X-ray counts based on maximum likelihood fits.
Xray_Spect_Index
The X-ray spectral index alpha_x defined such that
F_x ~ energy^alpha_x and derived by fitting 3-color X-ray data assuming
Galactic absorption (except for stellar IDs). See Mittaz et al. (1999,
MNRAS, 308, 233) for more details.
Xray_Spect_Index_Error
The RMS uncertainty in the X-ray spectral index.
App_Mag_Type
A flag parameter which indicates the type of optical
magnitude, as follows:
C - from other catalogs (see Table 3 of the published paper); E - from APM measurements of POSS-E plates; O - from APM measurements of POSS-O plates; R - from R-band CCD images; V - from V-band CCD images; S - slit magnitudes derived by folding the spectrum through the R-band response. The typical accuracy of the slit magnitudes is about 30% (see Puchnarewicz et al., 1996MNRAS.281.1243P).
App_Mag
The magnitude of the Optical Counterpart (or the brightest galaxy,
for clusters).
Opt_Spect_Index
The slope alpha_o of the optical continuum. Uncertainties
in the slope are about 50% and are dominated by systematic effects
(see Puchnarewicz et al., 1996MNRAS.281.1243P).
ID_Flag
A flag parameter which is set to ':' to indicate uncertainty in
the identification.
Broad_Class
The broad category of the optical identification in one
of 5 categories: 'Star', 'AGN', 'ELG' (for emission-line galaxy),
'Clus' (for cluster of galaxies), or 'Gal' (for galaxy). The number in
parentheses following the 'Clus' category indicates the number of cluster
galaxies whose redshifts have been measured.
Source_Type
The optical classification subtype, for stars being the
spectral type, and for AGN being the specific AGN type.
Redshift_Flag
A flag parameter which is set to ':' to indicate uncertainty
in the quoted redshift.
Redshift
The redshift (for extragalactic counterparts).
Emission_Lines
The emission lines observed in AGN and ELG identifications.
The line used in the calculation of the FWHM is indicated by the
trailing asterisk.
Emission_FWHM
The full-width half-maximum (FWHM) of the annotated emission
line, in units of km/s, rounded down to the nearest integral value of
103 km/s. Preference is given to the H-beta or MgII lines when they are
available and well defined. Otherwise, the best defined permitted line
in the spectrum is used. More complete details of emission line
measurements are given in Puchnarewicz et al. (1997MNRAS.291..177P).
Emission_FWHM_Flag
A flag parameter which is set to ':' to indicate
uncertainty in the quoted value for the emission line FWHM.
Note_Flag
Non-blank values for this parameter signify as follows: 'C',
that there is a catalogue cross-reference in table 3 of the published paper,
'N' that there is an additional note in section 3.2 of the published paper,
and 'I' that there is a CCD image of the field in Fig. 4 of the paper.
Alt_Name
The RIXOS source designation, in the form 'RIXOS FFF-NNN', where
FFF is the Field ID and NNN is the source ID within the field.
Class
The HEASARC Browse object classification, based on the value of the
source_type parameter, if available, else on the value of the broad_class
parameter.