ACDS V10.0 - Fri Jul 30 13:50:09 CEST 2021
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Detailed Description of IX/32 :
ROSAT Bright Survey (Fischer+, 1998-2000)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
IX/32 ROSAT Bright Survey (Fischer+, 1998-2000)
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The ROSAT Bright Survey.
I. Identification of an AGN sample with hard ROSAT X-ray spectra
II. Catalogue of all high-galactic latitude RASS sources with PSPC
countrate CR>0.2s-1.
Fischer J.-U., Hasinger G., Schwope A.D., Brunner H., Boller T.,
Trumper J., Voges W., Neizvestny S., Schwarz R., Ugryumov A., Belage Yu.
<Astron. Nachrichten 319, 347 (1998); 321, 1 (2000)>
=1998AN....319..347F
=2000AN....321....1S
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ADC_Keywords: Surveys ; X-ray sources ; Active gal. nuclei
Mission_Name: ROSAT
Keywords: AGN - interacting galaxies - surveys: X-rays - surveys: AGN
Description:
The ROSAT Bright Survey (RBS, table "rosat.dat") aims to completely
optically identify the 2072 brightest sources detected in the ROSAT
all-sky survey (Cat. IX/10) at galactic latitudes |b|>30°
(excluding LMC, SMC, Virgo cluster), with countrate above 0.2s-1;
this program is 99.5% complete, and a sub-sample of 931 sources with
countrate above 0.2s-1 in the hard spectral band between 0.5 and
2.0keV is 100% identified. The total survey area comprises
20391°2 at a flux limit of 2.4x10-12erg/cm2/s in the
0.5-2.0keV band.
Tables 1 and 3 examine the "RHS" sub-sample of 66 bright point-like
ROSAT survey sources with almost hard PSPC spectra (hardness ratio
HR1>0.5) which could be nearly completely identified by low-resolution
optical spectroscopy with the following breakdown into object classes:
31 Seyfert galaxies (20 Sy1), 22 BL Lac candidates, 5 clusters of
galaxies, 1 cataclysmic variable, and 5 bright stars. Only one object
remained unidentified and one X-ray source was a spurious detection.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× table1.dat 70 65 List of X-ray sources forming the
ROSAT Hard Survey, RHS
× table3.dat 75 64 Summary of the optical identification program
of the new sources in the RHS-sample.
× note3.dat 84 33 Notes from table3.dat
× rosat.dat 151 2072 The ROSAT Bright Survey (RBS) catalogue
× notes.dat 80 283 Individual notes of rosat.dat file
See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RHS ROSAT Hard Survey sequential number
4- 7 I4 --- RBS ? ROSAT Bright Survey sequential number
9- 23 A15 --- 1RXSJ 1RXSJ (Cat. IX/10) designation
25- 26 I2 h RAh X-ray right ascension (J2000)
28- 29 I2 min RAm X-ray right ascension (J2000)
31- 34 F4.1 s RAs X-ray right ascension (J2000)
36 A1 --- DE- X-ray declination sign (J2000)
37- 38 I2 deg DEd X-ray declination (J2000)
40- 41 I2 arcmin DEm X-ray declination (J2000)
43- 44 I2 arcsec DEs X-ray declination (J2000)
46 A1 --- D [PH] Detector (P: PSPC, H: HRI)
48- 49 I2 arcsec e_Pos X-ray positional uncertainty
51- 54 F4.2 ct/s CRate Count rate (1)
56- 59 F4.2 ct/s e_CRate rms uncertainty on CRate
61- 65 F5.2 --- HR1 Hardness ratio 1 (1)
67- 70 F4.2 --- e_HR1 rms uncertainty on HR1
Note (1): X-ray count rates and hardness ratios are derived from the
All-Sky Survey Bright Source Catalogue (1RXS, Voges et al., 1996, Cat.
<IX/10), with the exception of RHS10, where the SASS1-processed survey
data are used.
HR1=(H+S)/(H-S) with the ROSAT-PSC count rates
H in the hard band (0.5-2.0keV) and S in the soft band (0.1-0.4keV).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- RHS RHS number
5- 6 I2 h RAh Optical right ascension (J2000)
8- 9 I2 min RAm Optical right ascension (J2000)
11- 14 F4.1 s RAs Optical right ascension (J2000)
16 A1 --- DE- Optical declination sign (J2000)
17- 18 I2 deg DEd Optical declination (J2000)
20- 21 I2 arcmin DEm Optical declination (J2000)
23- 24 I2 arcsec DEs Optical declination (J2000)
27- 28 I2 arcsec Dox Positional difference between the optical
and X-ray coordinates
32- 35 A4 --- Class Classification of the object
38- 46 A9 --- Type Type of the object
48- 52 F5.3 --- z ? Redshift
55- 58 F4.1 mag Vmag Optical brightness
60- 63 F4.1 10-15W/m2 FX Integrated X-ray flux between 0.5 and 2.0keV
65- 70 F6.1 mJy Fr ? Radio flux at 1.4GHz
72- 75 A4 --- Notes Notes detailed in note3.dat
Byte-by-byte Description of file: note3.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Note Note designation in table3.dat
3 A1 --- --- [:]
5- 84 A80 --- Text Text of note
Byte-by-byte Description of file: rosat.dat
Bytes Format Units Label Explanations
1- 4 I4 --- RBS ROSAT Bright Survey number
6- 20 A15 --- 1RXSJ 1RXSJ X-ray coordinates (Cat. IX/10)
22- 23 I2 h RAh ? Optical right ascension (J2000)
25- 26 I2 min RAm ? Optical right ascension (J2000)
28- 31 F4.1 s RAs ? Optical right ascension (J2000)
33 A1 --- DE- Optical declination sign (J2000)
34- 35 I2 deg DEd ? Optical declination (J2000)
37- 38 I2 arcmin DEm ? Optical declination (J2000)
40- 41 I2 arcsec DEs ? Optical declination (J2000)
43- 45 I3 arcsec Dist ? Distance optical minus X positions
48- 50 I3 arcsec e_Pos X-ray positional uncertainty (1{sigma}) as
given in the 1RXS-catalog. The 90% confidence
error radius is r90=1.65{sigma}
52- 56 F5.2 ct/s CR RASS countrate in the total ROSAT
window 0.1-2.4keV
58- 62 F5.2 ct/s CRH RASS countrate in the hard ROSAT
window 0.5-2.0keV
64- 68 F5.2 --- HR1 hardness ratio (1)
70- 74 F5.2 --- HR2 hardness ratio (1)
76- 80 F5.2 10+20cm-2 NH Galactic hydrogen column density
82- 91 A10 --- Name (Truncated) Name in optical catalogues
93- 97 A5 ---- XClass Class of X-ray source (2)
99-108 A10 --- Type Type within class (2)
110-115 F6.4 --- z ? redshift
116 A1 --- u_z Uncertainy flag on z
118 A1 --- l_Mag Limit flag on Mag
119-122 F4.1 mag Mag ? Optical brightness (typically in the V-band,
sometimes only through spectrograph slit
123 A1 --- u_Mag Uncertainty flag on Mag
124 A1 --- n_Mag [CSNBDRE] Band and origin of magnitude (3)
126-130 I5 10-17W/m2 FX Flux in ROSAT X-ray band
131-136 F6.2 --- logFX/Fo ? log flux ratio X-ray to optical
137-141 F5.1 10-7W logLX ? log of X-ray luminosity
143 A1 --- Note [Y] Y: Note detailed in notes.dat file
Note (1): Hardness ratio:
HR1=(H+S)/(H-S) with H and S being the counts in the hard (0.5-2.0keV)
and the soft (0.1-0.4keV) spectral bands, respectively.
HR2=(D-C)/(D+C) with D and C being the count in the (0.9-2.0keV)
and the (0.5-0.9keV) spectral bands, respectively.
Note (2): A column indicates an uncertain identification.
AGN: active galactic nucleus, X-rays originate from the central engine
GALAX: normal galaxy without obvious nuclear activity. X-rays originate
predominantly from the stellar constituents of the galaxy
CLUST: cluster of galaxies
GGRP: small (compact) group of galaxies
STAR: coronal or photospheric emitter of X-rays
CV: cataclysmic variable or related object (white dwarf accretor)
XRB: X-ray binary (neutron star or black hole accretor)
MC: Magellanic cloud source, not considered in the identification program
VIRGO: X-ray source in the Virgo region, not considered in the
identification program
Note (3): Origin of magnitude:
C: CDS/SIMBAD (V band)
D: CDS/SIMBAD (D band)
N: NED (a magnitude in the optical range)
R: APM/ROE scan of POSS/ESO/SERC red (E) plate
B: APM/ROE scan of POSS/ESO/SERC blue (O) plate
S: below slit magnitude determined by folding a low-resolution
spectrum with the sensitivity curve of a V-filter
E: not specified
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 4 I4 --- RBS RBS number
6- 80 A75 --- Note Text of the note
Acknowledgements: A. Schowpe aschwope@aip.de
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(End) James Marcout, Patricia Bauer [CDS] 22-Jan-2002