RIXOS - ROSAT International X-Ray/Optical Survey Source Catalog
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)
The ROSAT X-ray source designation, derived from the J2000 equatorial coordinates of the X-ray centroid.
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.
The X-ray 90% confidence positional radius in arcseconds.
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.
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.
The Galactic Longitude of the RIXOS object.
The Galactic Latitude of the RIXOS object.
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.
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.
The X-ray count rate, in ct/s.
The RMS uncertainty in the X-ray count rate, in ct/s.
The total X-ray counts based on maximum likelihood fits.
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.
The RMS uncertainty in the X-ray spectral index.
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).
The magnitude of the Optical Counterpart (or the brightest galaxy, for clusters).
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).
A flag parameter which is set to ':' to indicate uncertainty in the identification.
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.
The optical classification subtype, for stars being the spectral type, and for AGN being the specific AGN type.
A flag parameter which is set to ':' to indicate uncertainty in the quoted redshift.
The redshift (for extragalactic counterparts).
The emission lines observed in AGN and ELG identifications. The line used in the calculation of the FWHM is indicated by the trailing asterisk.
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).
A flag parameter which is set to ':' to indicate uncertainty in the quoted value for the emission line FWHM.
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.
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.
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.