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 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
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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 1998ApJ...503...77M
d - David et al. 1993ApJ...412..479D 1993ApJ...412..479D
Note (3): m - Markevitch et al. 1998ApJ...503...77M 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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History:
From electronic Astrophys. Journal edition.
(End) N. Odegard [NASA/ADC] 24-Jul-2001