RASSNORSAM - ROSAT All-Sky Survey Completely Identified Northern Sample

Overview

This table contains a completely identified sample of northern ROSAT All-Sky Survey (RASS) X-ray sources, as well as some additional X-ray sources which either had count rates below the adopted limits or were located outside the boundaries of the study areas. It is a catalog of optical identifications of a representative sample of northern (declination > -9 degrees) RASS sources. A full identification has been carried out for a count-rate- and area-limited complete RASS subsample comprising 674 sources. All sources are within six study areas outside the galactic plane (absolute galactic latitude |b| > 19.6 degrees), one area being near the North Galactic Pole and one near the North Ecliptic Pole.

Catalog Bibcode

1998ApJS..117..319A

References

Identification of a complete sample of northern ROSAT All-Sky Survey X-ray
sources. III. The catalog.
       Appenzeller I., Thiering I., Zickgraf F.-J., Krautter J., Voges W.,
       Chavarria C., Kneer R., Mujica R., Pakull M., Rosso C., Ruzicka F.,
       Serrano A., Ziegler B.
      <Astrophys. J. Suppl. Ser. 117, 319 (1998)>
      =1998ApJS..117..319A

Provenance

This table was created by the HEASARC in August 2003 based on CDS tables J/ApJS/117/319/table1.dat.gz and J/ApJS/117/319/table2.dat.gz.

Parameters

Catalog_Name
This is an internal designation for the X-Ray sources in the six study areas using the recommended 'ATZ98 ' prefix, a letter code, and a sequence number in order of increasing J2000 RA. The letter codes A through F refer to study areas I, II, III, IV, V, and VI. One of the study areas (V) was chosen to be close to the North Ecliptic Pole, another (IV) is close to the North Galactic Pole, while the other four areas are in regions of medium to high X-ray sensitivity levels.

Name
The ROSAT "RX J" X-ray source designation.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000 coordinates and to a precision of 0.1 seconds of time in the original catalog.

Dec
The Declination of the X-ray source in the selected equinox. This was given in J2000 coordinates and to a precision of 1 arcsecond in the original catalog.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

Count_Rate
The net X-Ray source count rate, in counts/s, as derived after superposition of all ROSAT scan stripes and correction for vignetting and dead time.

Count_Rate_Error
The RMS uncertainty in the X-ray source count rate, in counts/s, as given by the maximum likelihood algorithm of the ROSAT Standard Analysis Software System (SASS) of MPE, Garching.

Hardness_Ratio_1
The hardness ratio HR1 = (B-A)/(B+A), where A is the integrated counts in the energy range 0.11-0.41 keV, and B is the integrated counts in the energy range 0.52-2.01 keV.

Hardness_Ratio_1_Error
The statistical mean error in the hardness ratio HR1.

Hardness_Ratio_2
The hardness ratio HR2 = (D-C)/(D+C), where C is the integrated counts in the energy range 0.52-0.90 keV, and D is the integrated counts in the energy range 0.91-2.01 keV.

Hardness_Ratio_2_Error
The statistical mean error in the hardness ratio HR2.

Flux
The X-Ray flux, in units of erg/s/cm² derived from the count rate (as described by Zickgraf 1997, A&AS, 123, 103).

RA_Offset
The Right Ascension of the X-ray source minus the RA of the optical counterpart, in arcsec, for the J2000.0 equinox. For extended objects, double stars, and other cases where no accurate position could be determined, this is left blank.

Dec_Offset
The Declination of the X-ray source minus the Declination of the optical counterpart, in arcsec, for the J2000.0 equinox. For extended objects, double stars, and other cases where no accurate position could be determined, this is left blank.

ID_Quality
An identification quality index which can have the following possible values:

         1: reliable identifications based on authors' own observations
         2: reliable informations with a known object based on literature data
         3: likely but uncertain identifications
         4: case in which no plausible optical counterpart could be found

Classification
The classification of the optical counterpart to the X-ray source. For multiple (maximum 3) counterparts, the entries are listed in order of likelihood or assumed relative contribution to the total X-ray flux and are separated by a colon. The abbreviations have the following meanings:

        st: normal star (i.e., an unresolved objects showing a stellar
             absorption spectrum, including late-type stars showing
             chromospheric emission lines, such as dMe stars).
        ES: (hot) emission-line star (unresolved objects showing a blue
             continuum, with or without absorption lines, and unshifted
             emission lines. Most objects classified ES show typical CV
             spectra).
        WD: white dwarf (star showing absorption lines with FWHM>1500km/s).
       WDA: white dwarf with Balmer lines only.
        S1: Seyfert 1 galaxy (galaxy with an unresolved nucleus showing a
             Seyfert-type spectrum with broad (>2000km/s) permitted lines and
             with M_B_>-23.5).
       S15..S19: Seyfert galaxy of type 1.5-1.9
       NL1: Narrow-line Seyfert 1 galaxy (spectrum showing line ratios
             typical of Seyfert 1 but with lower FWHM of permitted lines).
        S2: Seyfert 2 galaxy
        LI: LINER
       QSO: quasi-stellar object (unresolved or resolved object with
             M_B_<-23.5 showing a Seyfert 1 spectrum).
       BLL: BL Lac object
         G: (single) galaxy
       Gin: interacting galaxy pair
        Gr: radio galaxy
       GSB: starburst galaxy
         C: cluster or group of galaxies

Spect_Type
The spectral type for stellar sources.

Redshift
The redshift for extragalactic sources, as determined from the authors' spectra (if not mentioned otherwise in the notes to the published Table 2 and/or in the file https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/117/319/notes.dat.gz).

Vmag
The Johnson V magnitude of the optical counterpart. With the exception of bright stars for which photometry was available from SIMBAD, V was calculated from the E and O magnitudes of the APM sky survey scans as described by Zickgraf et al. (1997). As the APM scans are known to contain errors, the individual magnitudes should be used with caution. In some cases, only an O or a B magnitude either from the COSMOS UKST database (only field III) or NED existed: in such cases, the B-V color was assumed according to the object type, 0.5 for AGN, 1.0 for galaxies, and, for stars, the color appropriate for the corresponding spectral type.

BV_Color
The B-V color index of the optical counterpart calculated from the E and O magnitudes of the APM sky survey scans. As the APM scans are known to contain errors, the individual colors should be used with caution. In some cases, only an O or a B magnitude either from the COSMOS UKST database (only field III) or NED existed: in such cases, the B-V color was assumed according to the object type, 0.5 for AGN, 1.0 for galaxies, and, for stars, the color appropriate for the corresponding spectral type. In such cases, this field has not been populated.

Xv_Index
The XV-Index log f_x/f_V, i.e., the decadic logarithm of the ratio of the X-ray flux and the visual flux, the latter being calculated from the V magnitude according to the relation given by Stocke et al. (1996, ApJS, 76, 813).

Flux_6_cm
The radio flux at 4.85 GHz (6 cm) in mJy, for sources within the declination range 0 < Dec < +75 degrees, from Gregory & Condon (1991, ApJS, 75, 1011).

Alt_Name
The alternative designation of the (main) optical counterpart, if known. For stars, the entry numbers in the most common star catalogs are listed. For other objects, the corresponding designations and abbreviations listed in the NED and SIMBAD databases are given. In a few cases of very long designations, the names have been shortened or truncated. Since in all these cases coordinate information is given in the table, this should not result in ambiguities. The full designations can be obtained from the NED. Although in the Remarks NRAO VLA Sky Survey (NVSS) (Condon et al., 1998, CDS Cat. <J/AJ/115/1693>) data are quoted for some sources, no NVSS designations are used since the final version of the NVSS catalog is still listed as "in preparation."

Remark_Flag
A flag parameter which is set to "R" to indicate that there is a detailed remark in the documentation file at https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/117/319/notes.dat.gz.

Complete_Subsample
A flag parameter which is set to "Y" to indicate that the source is in the complete X-ray subsample, i.e., is listed in Table 1 of the published paper, or is set to "N" to indicate that the source is one of the additional sources not part of the complete sample which are listed in Table 2 of the published paper. This parameter was added by the HEASARC when it combined these two tables to make one HEASARC table.

Class
The HEASARC Browse object classification based on the classification and/or spect_type parameter values.

Contact Person

Questions regarding the RASSNORSAM database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:33:31 EDT