RASSHGSFT2 - ROSAT All-Sky Survey: Soft High Galactic-Latitude X-Ray Sources 2

Overview

This table contains a summary of spectroscopic identifications of bright soft high-galactic-latitude X-ray sources from the ROSAT All-Sky Survey (RASS) with total PSPC count rates 0.11 < CR < 0.5 cts/s and hardness ratios HR1 < 0. This study supplements the identification program of a complete sample of sources with CR >= 0.5 cts/s presented previously (Thomas et al. 1998, A&A, 335, 467; available at the HEASARC as the RASSHGSOFT table). Spectroscopic identifications are presented for 70 of 77 sources, 5 sources are identified by other means, and subsidiary information is given for 2 as yet unidentified sources. In practically all cases, a unique optical counterpart exists. As for the brighter fraction of the sample, the largest source classes are Seyfert 1 galaxies, magnetic cataclysmic variables, and hot white dwarfs. In the Galactic Pole caps at |b| > 40 degrees, Seyfert galaxies dominate, whereas at intermediate latitudes galactic objects as magnetic cataclysmic variables and white dwarfs become relatively more frequent.

Catalog Bibcode

1999A&A...347...47B

References

Identification of soft high galactic latitude RASS X-ray sources. II.
Sources with PSPC count rate CR < 0.5 cts/s.
    Beuermann K., Thomas H.-C., Reinsch K., Schwope A.D., Truemper J., Voges W.
   <Astron. Astrophys. 347, 47 (1999)>
   =1999A&A...347...47B

Provenance

This table was created by the HEASARC in May 2012 based on CDS Catalog J/A+A/347/47 file table3,dat.

HEASARC Implementation

The HEASARC has corrected the position-based parts of the names of two of the sources in this catalog, J083650.3-155238 and J080621.7-152715, to match their positive declinations, i.e., they are J083650.3+155238 and J080621.7+152715 in this table.

Parameters

Name
The X-ray source designation as recommended by the Dictionary of Nomenclature of Celestial Objects, namely '[BTR99] JHHMMSS.s+DDMMSS', where the prefix stands for Beuermann, Thomas, Reinsch 1999 and the numerical part is based on the X-ray position in J2000.0 equatorial coordinates.

RA
The Right Ascension of the X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.1 seconds of time in the position-based name. This is taken from the RASS BSC for all but 4 sources: J021257.7-585109 for which it comes from the RASS FSC, and J015400.9-594749, J083650.3+155238 and J080621.7+152715 for which it is derived from small photon event tables (PETs) extracted from the RASS.

Dec
The Declination of the X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 1 arcsecond in the position-based name. This is taken from the RASS BSC for all but 4 sources: J021257.7-585109 for which it comes from the RASS FSC, and J015400.9-594749, J083650.3+155238 and J080621.7+152715 for which it is derived from small photon event tables (PETs) extracted from the RASS.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

Source_Flag
This flag parameter is set to 'X' to indicate that the source is in the RASS Bright Source Catalog, the HEASARC RASSBSC table. Only 3 sources do not have this flag set: J015400.9-594749, J083650.3+155238 and J080621.7+152715. These 3 sources are discussed in the notes to Table 3 of the published paper. (Strictly speaking, the HEASARC notes that the source J021257.7-585109 should also have this flag set, as it is not in the RASS BSC but is in the RASS Faint Source Catalog, the HEASARC RASSFSC table).

RA_Optical
The Right Ascension of the optical counterpart to the X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 0.1 seconds of time in the original table. Three X-ray sources (J181810.0+534343, J203636.2-535222 and J234939.7-563723) have multiple optical counterparts: in these cases, the optical counterpart position and offset have been left blank.

Dec_Optical
The Declination of the optical counterpart to the X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates to a precision of 1 arcsecond in the original table. Three X-ray sources (J181810.0+534343, J203636.2-535222 and J234939.7-563723) have multiple optical counterparts: in these cases, the optical counterpart position and offset have been left blank.

Offset
The angular separation of the optical and X-ray positions, in arcseconds.

Offset_Sigma
The angular separation of the optical and X-ray positions, in units of the 90% confidence radii, r_90, The latter is 1.65 times the 1-sigma positional uncertainty given in the RASS BSC.

Count_Rate
The PSPC count rate of the X-ray source, in counts s^-1. This is taken from the RASS BSC for all but 4 sources: J021257.7-585109 for which it comes from the RASS FSC, and J015400.9-594749, J083650.3+155238 and J080621.7+152715 for which it is derived from small photon event tables (PETs) extracted from the RASS.

Count_Rate_Error
The RMS uncertainty in the PSPC count rate of the X-ray source, in counts s^-1. This is taken from the RASS BSC for all but 4 sources: J021257.7-585109 for which it comes from the RASS FSC, and J015400.9-594749, J083650.3+155238 and J080621.7+152715 for which it is derived from small photon event tables (PETs) extracted from the RASS.

Hardness_Ratio
The hardness ratio HR1 = (H-S)/(H+S), where H and S are the count rates in the hard and soft energy intervals of 0.5-2.0 keV and 0.1-0.4 keV, respectively.

Hardness_Ratio_Error
The RMS uncertainty in the hardness ratio HR1.

Broad_Class
The broad classification of the optical counterpart, as follows:

   AGN: active galactic nucleus
    CV: cataclysmic variable
   GAL: galaxy
  STAR: star

Source_Type
The specific type of the optical counterpart, usually being the spectral type for stars and the sub-type for CVs and AGN, where 'AM' means AM Her, 'IP' means intermediate polar, 'Sy1' means Seyfert 1, and 'WD' means white dwarf.

Redshift
The redshift of the optical counterpart, if extragalactic.

Redshift_Flag
This flag parameter is set to ':' to indicate that the redshift is uncertain.

Vmag
The visual magnitude V of the optical counterpart.

Notes
The codes for source-specific notes, as follows:

        1 = Spectroscopic identification, this work
        2 = WFC identification (Pye et al., 1995, CDS Cat. <J/MNRAS/274/1165>,
            Mason et al., 1995, CDS Cat. <J/MNRAS/274/1194>)
        3 = Hamburg/RASS identification (Bade et al., 1998A&AS..127..145B)
        4 = see also Grupe et al. (1998A&A...330...25G)
        5 = Inferred identification from the Digitized Sky Survey
        6 = Radio source
        7 = Listed also by Veron-Cetty & Veron (1996, CDS Cat. <VII/188>)
        8 = Remarks on individual sources in paper and/or notes.dat file

The notes.dat file is available at http://cdsarc.u-strasbg.fr/ftp/pub/cats/J/A+A/347/47/notes.dat.

Class
The HEASARC Browse object classification, based on the source_type, else on the broad class.

Contact Person

Questions regarding the RASSHGSFT2 database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:33:29 EDT