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J/ApJ/504/27  The LX-T Relation for Nearby Clusters         (Markevitch, 1998)

The LX-T Relation and Temperature Function for Nearby Clusters Revisited Markevitch M. <Astrophys. J. 504, 27 (1998)> =1998ApJ...504...27M
ADC_Keywords: Clusters, galaxy; X-ray sources Keywords: cooling flows - galaxies: clusters: general - intergalactic medium - X-rays: galaxies Mission Names: ASCA, ROSAT Abstract: The X-ray luminosity-temperature relation for nearby T ~= 3.5-10 keV clusters is rederived using new ASCA temperatures and ROSAT luminosities. Both quantities are derived by directly excluding the cooling flow regions. This correction results in a greatly reduced scatter in the LX-T relation; cooling flow clusters are similar to others outside the small cooling flow regions. For a fit of the form Lbol ∝ Tα, we obtain α = 2.64 ± 0.27 (90%) and a residual rms scatter in log Lbol of 0.10. The derived relation can be directly compared to theoretical predictions that do not include radiative cooling. It also provides an accurate reference point for future evolution searches and comparison to cooler clusters. The new temperatures and LX-T relation together with a newly selected cluster sample are used to update the temperature function at z ∼ 0.05. The resulting function is generally higher and flatter than, although within the errors of, the previous estimates by Edge and coworkers and Henry and Arnaud (as rederived by Eke and coworkers). For a qualitative estimate of constraints that the new data place on the density fluctuation spectrum, we apply the Press-Schechter formalism for Ω0 = 1 and 0.3. For Ω0 = 1, assuming cluster isothermality, the temperature function implies σ8 = 0.55 ± 0.03, while taking into account the observed cluster temperature profiles, σ8 = 0.51 ± 0.03, consistent with the previously derived range. The dependence of σ8 on Ω0 is different from the earlier results because of our treatment of the slope of the fluctuation spectrum, n, as a free parameter. For the considered values of Ω0, n = -(2.0-2.3) ± 0.3, somewhat steeper than that derived from the earlier temperature function data, in agreement with the local slope of the galaxy fluctuation spectrum from the Automatic Plate Measuring Facility (APM) survey, and significantly steeper than the standard cold dark matter prediction. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 35 Full Cluster Sample
See also: http://hea-www.harvard.edu/~maxim/papers/tfdata/index.html : Temperature function data and other supplementary data Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Cluster Name 13 A1 --- n_Name [*d] Note on name (1) 15- 19 F5.3 --- z Redshift 21- 23 F3.1 keV Tfit Temperature from fit 26- 28 F3.1 keV E_Tfit Error on Tfit in + direction (90% confidence) 30- 32 F3.1 keV e_Tfit Error on Tfit in - direction (90% confidence) 34 A1 --- r_Tfit [md] Source of Tfit (2) 36- 38 F3.1 keV Tcorr Cooling flow-corrected temperature 40 A1 --- r_Tcorr [me] Source of Tcorr (3) 42- 44 F3.1 keV E_Tcorr ?=-.9 Error on Tcorr in + direction (90% confidence) (4) 47- 49 F3.1 keV e_Tcorr ?=-.9 Error on Tcorr in - direction (90% confidence) (4) 51- 54 F4.2 10+37W LXtot Total 0.1-2.4 keV luminosity (5) 56- 59 F4.2 10+37W LX ?=-9.99 Corrected 0.1-2.4 keV Luminosity (6) 61- 65 F5.2 10+37W Lbol ?=-9.99 Bolometric luminosity (6) 67- 71 F5.2 10-14W/m2 flux ?=-9.99 0.1-2.4 keV flux, corrected for absorption (6)
Note (1): * indicates cluster is at |b| < 20 degrees. d indicates flux of the cluster is below the limit. These clusters are used for the LX-T relation only. Note (2): m - Markevitch et al. 1998ApJ...503...77M d - David et al. 1993ApJ...412..479D Note (3): m - Markevitch et al. 1998ApJ...503...77M e - estimated from LX-T relation derived here Note (4): -.9 = no data Note (5): Total luminosity within r < 1 h-1 Mpc, including cooling flow regions Hubble constant assumed: H0 = 100 km/s/Mpc Note (6): Cooling flow regions excised Hubble constant assumed: H0 = 100 km/s/Mpc -9.99 = no data
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(End) N. Odegard [NASA/ADC] 24-Jul-2001
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