J/AJ/126/2740 X-ray emission of RASS Abell clusters (Ledlow+, 2003)
The X-ray properties of nearby Abell clusters from the ROSAT All-Sky Survey:
the sample and correlations with optical properties.
Ledlow M.J., Voges W., Owen F.N., Burns J.O.
<Astron. J., 126, 2740-2751 (2003)>
=2003AJ....126.2740L 2003AJ....126.2740L
ADC_Keywords: Surveys ; Clusters, galaxy ; X-ray sources
Keywords: catalogs - galaxies: clusters: general - surveys - X-rays
Abstract:
We present an analysis of the X-ray emission for a complete sample of
288 Abell clusters spanning the redshift range 0.016≤z≤0.09 from the
ROSAT All-Sky Survey. This sample is based on our 20cm VLA survey of
nearby Abell clusters. We find an X-ray detection rate of 83%. We
report cluster X-ray fluxes and luminosities and two different flux
ratios indicative of the concentration and extent of the emission. We
examine correlations between the X-ray luminosity, Abell richness, and
Bautz-Morgan and Rood-Sastry cluster morphologies. We find a strong
correlation between LX and cluster richness coupled with a dependence
on the optical morphological type. These results are consistent with
the observed scatter between X-ray luminosity and temperature and a
large fraction of cooling flows. For each cluster field, we also
report the positions, peak X-ray fluxes, and flux ratios of all X-ray
peaks above 3σ significance within a box of 2x2(h75)-1Mpc
centered on Abell's position.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 579 X-ray Properties of Nearby Abell Cluster Sample
table2.dat 57 856 X-ray Peaks and Optical identifications
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Abell Abell cluster identification
7 A1 --- f_Abell [*4] Flag on Abell (1)
9- 14 F6.4 --- z Redshift
16- 19 I4 --- Exp Mean RASS exposure time
21- 22 I2 h RAh Hour of Right Ascension (J2000)
24- 25 I2 min RAm Minute of Right Ascension (J2000)
27- 30 F4.1 s RAs Second of Right Ascension (J2000)
32 A1 --- DE- Sign of the Declination (J2000)
33- 34 I2 deg DEd Degree of Declination (J2000)
36- 37 I2 arcmin DEm Arcminute of Declination (J2000)
39- 40 I2 arcsec DEs Arcsecond of Declination (J2000)
42- 44 I3 kpc Off ? Offset X-ray peak projected distance
from Abell's position (2)
46 A1 --- l_FX Limit flag on FX
47- 51 F5.2 10-15W/m2 FX ? Peak X-ray flux (10-12erg/s/cm2)
within a 500(h75)-1kpc aperture
53- 56 F4.2 10-15W/m2 e_FX ? Error in FX
58 A1 --- l_LX Limit flag on LX
59- 63 F5.2 10+36W LX Luminosity in units of 1043erg/s (3)
65- 68 F4.2 10+36W e_LX ? Error in LX
70- 73 F4.1 --- F500 ? The 500/62.5(h75)-1kpc aperture
flux ratio
75- 79 F5.1 --- S/N ? Signal to noise (4)
81- 85 F5.1 --- S/Nmax ? Maximum signal to noise
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Note (1): Note on Name
* = There is a pointed ROSAT PSPC observation
(including serendipidous) ≤0.3° of Abell's position
4 = A2122 and A2124 form a bimodal cluster-pair at the same redshift
Note (2): A Null value indicates that the position, LX, e_LX, and S/N
are for the entire cluster.
Offsets indicate the other values are for the X-ray peak.
Note (3): Within a 500(h75)-1kpc and assuming H0=75 and q0=0.5.
When Off = Null, this is the total cluster luminosity centered on
Abell's position.
Note (4): When Off is blank, this is the total S/N within the aperture.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Abell Abell cluster identification
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 16 F4.1 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 26 I2 arcsec DEs Arcsecond of Declination (J2000)
28- 31 I4 arcsec Off X-ray peak projected distance from
Abell's position
33- 37 F5.2 10-4ct/s/pix PFlux Peak flux in units of 10-4counts/s/pixel
39- 42 F4.1 --- F250 The 250/62.5(1/h75)kpc aperture flux ratio
44- 48 F5.1 --- S/N Significance of the detection
50- 55 A6 --- Note Cluster emission code (1)
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Note (1): Cluster emission code:
C = identified the peak with the cluster emission;
M = cluster emission appears bimodal or multimodal.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Jan-2004