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J/ApJS/129/435 NORAS galaxy cluster survey. I. (Bohringer+, 2000)
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The northern ROSAT all-sky (NORAS) galaxy cluster survey. I.
X-ray properties of clusters detected as extended X-ray sources.
Bohringer H., Voges W., Huchra J.P., McLean B., Giacconi R., Rosati P.,
Burg R., Mader J., Schuecker P., Simic D., Komossa S., Reiprich T.H.,
Retzlaff J., Trumper J.
<Astrophys. J. Suppl. Ser. 129, 435 (2000)>
=2000ApJS..129..435B
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ADC_Keywords: Clusters, galaxy ; Surveys ; X-ray sources
Mission_Name: ROSAT
Keywords: galaxies: clusters: general - large-scale structure of universe -
surveys - X-rays: galaxies
Abstract:
In the construction of an X-ray-selected sample of galaxy clusters for
cosmological studies, we have assembled a sample of 495 X-ray sources
found to show extended X-ray emission in the first processing of the
ROSAT All-Sky Survey. The sample covers the celestial region with
declination {delta}>=0{deg} and Galactic latitude |b|>=20{deg} and
comprises sources with a count rate >=0.06counts/s and a source extent
likelihood of L>=7. In an optical follow-up identification program we
find 378 (76%) of these sources to be clusters of galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 378 The NORAS Cluster X-Ray Source Catalog
table2.dat 101 99 The Noncluster X-Ray Sources among the Extended
RASS 1 Sources
table3.dat 101 18 The AGNs in Clusters and Noncluster Sources in the
Line of Sight with Probable Clusters
table4.dat 64 18 X-Ray Properties of the Noncluster X-Ray Source
Cluster Combinations
table5.dat 62 378 X-Ray Properties of the NORAS Cluster X-Ray Source
table6.dat 108 85 Additional ACO89 (Cat. <VII/110>) Clusters
Detected as X-Ray Sources in the 9h-14h Region
table7.dat 62 84 X-Ray Properties of the Additionally Found ACO89
Clusters
table9.dat 62 21 X-Ray Properties of the Additional Extended
Cluster Sources
table8.dat 106 21 Additional Clusters Detected as Extended X-Ray
Sources in the 9h-14h Region
refs.dat 151 81 Redshift references
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See also:
VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
Byte-by-byte Description of file: table1.dat table6.dat table8.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- RXC RXC designation (based on J2000 position)
18- 32 A15 --- Name Alternative name
33- 34 A2 --- n_Name Note on Name (1)
36- 43 F8.4 deg RAdeg Right ascension (J2000.0)
45- 52 F8.4 deg DEdeg Declination (J2000.0)
54- 59 F6.4 --- z Redshift
61- 65 F5.2 ct/s CR Count rate
67- 72 F6.2 10-15W/m2 FX X-ray flux
74- 79 F6.2 10-15W/m2 FX* Corrrected X-ray flux
81- 85 F5.1 % Error Factional uncertainty for the count rate,
the fluxes, and the luminosity
87- 91 F5.2 solLum LX Rest-frame X-ray luminosity of the clusters
in the 0.1-2.4keV energy band.
93- 96 F4.1 10+20cm-2 NH Absorbing column density in the line of
sight to the source
98-100 A3 --- ID Identification flag (2)
102-110 A9 --- r_z Redshift reference (separated by commas)
in refs.dat file
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Note (1): Individual notes:
a: See also Bade et al., 1998A&AS..127..145B
b: See also Ebeling et al., 1998MNRAS.301..881E
c: Barton et al., 1996AJ....112..871B
d: Crawford et al., 1995MNRAS.274...75C
e: Cooray et al., 1998AJ....115.1388C
f: Struble & Rood, 1991ApJ...374..395S
g: See also Tucker et al., 1995ApJ...444..532T
h: Appenzeller et al., 1998ApJS..117..319A
i: Wegner et al., 1996ApJS..106....1W
Note (2): Identification flag:
?: if the identification as a cluster leaves some residual doubts
B: sources that have been deblended
L: sources that have been analyzed in extra large fields
C: sources that may be contaminated
For the position we have used the coordinates determined by the
moment method with a 3' aperture radius. As an exception, in the
case of 12 cluster sources we have either chosen to redetermine the
center position by a moment method with a larger aperture of 5' or
7.5' or determined a center position by hand. In these sources the
automatic detection has selected a maximum that is significantly
offset from the global center of symmetry of the clusters.
b: 5' moment method
c: 7.5' moment method
o: determination by eye
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 56 A33 --- Aut Author's name
58-151 A94 --- Com Comments
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- RXJ RXJ designation (based on J2000 position)
17- 23 A7 --- Name Alternative name
25- 32 F8.4 deg RAdeg Right ascension (J2000.0)
34- 41 F8.4 deg DEdeg Declination (J2000.0)
43- 46 F4.2 ct/s CR Count rate
48- 52 F5.2 10-15W/m2 FX X-ray flux
54- 58 F5.2 10-15W/m2 FX* Corrected X-ray flux
60- 64 F5.2 % Error Factional uncertainty for the count rate,
the fluxes, and the luminosity
66- 69 F4.1 % Pext Extent parameter from the K-S test (1)
71- 73 F3.1 arcsec Rc Best -fitting core radius
75- 77 F3.1 arcsec Rmin Minimal radius value consistent with
the 2{sigma} uncertainty limit
79- 83 F5.2 --- HR Hardness ratio
85- 88 F4.2 --- e_HR rms uncertainty on HR
90- 94 F5.2 --- DHR Deviation from the expected value of HR
in units of {sigma}
96- 99 F4.1 10+20cm-2 NH Interstellar H I column density
101 A1 --- ID [cob] Alternative center determination flag (2)
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Note (1): Probability result of the Kolmogorov-Smirnov test for the source
to be a point source. For very low probabilities for the consistency
with a point source the parameter Pext was limited to a value of 30
for the entry in the table. A source is considered very likely to be
extended if this parameter has at least a value of 2 (point source
excluded with 99% probability).
Note (2): Alternative center determination:
b: 5' moment method
c: 7.5' moment method
o: determination by eye
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- RXJ RXJ designation (based on J2000 position)
17- 22 F6.4 --- z ? Redshift of AGN
24- 64 A41 --- Com Comments
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Byte-by-byte Description of file: table5.dat table7.dat table9.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- RXC RXC designation (based on J2000 position)
18- 22 F5.2 solLum LX Rest-frame ROSAT-band X-ray luminosity
24- 27 F4.1 arcmin RXarcmin Radius out to which the source count rate has
been integrated, in arcmin
29- 32 F4.2 Mpc RXMpc Radius out to which the source count rate has
been integrated, in Mpc
34- 37 F4.1 % Pext Extent parameter from the K-S test (1)
39- 41 F3.1 arcsec Rc Best -fitting core radius
43- 45 F3.1 arcsec Rmin Minimal radius value consistent with
the 2{sigma} uncertainty limit
47- 51 F5.2 --- HR Hardness ratio
53- 56 F4.2 --- e_HR rms uncertainty on HR
58- 62 F5.2 --- DHR Deviation from the expected value of HR
in units of {sigma}
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Note (1): Probability result of the Kolmogorov-Smirnov test for the source
to be a point source. For very low probabilities for the consistency
with a point source the parameter Pext was limited to a value of 30
for the entry in the table. A source is considered very likely to be
extended if this parameter has at least a value of 2 (point source
excluded with 99% probability).
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History:
From ApJS electronic version
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(End) James Marcout, Patricia Bauer [CDS] 13-Nov-2000