J/MNRAS/328/461 X-ray luminosities of early-type galaxies (O'Sullivan+, 2001)
A catalogue and analysis of X-ray luminosities of early-type galaxies.
O'Sullivan E., Forbes D.A., Ponman T.J.
<Mon. Not. R. Astron. Soc. 328, 461 (2001)>
=2001MNRAS.328..461O 2001MNRAS.328..461O
ADC_Keywords: X-ray sources ; Galaxy catalogs
Keywords: catalogues - surveys - galaxies: elliptical and lenticular, cD -
X-rays: galaxies
Abstract:
We present a catalogue of X-ray luminosities for 401 early-type
galaxies, of which 136 are based on newly analysed ROSAT PSPC pointed
observations (Cat. IX/30). The remaining luminosities are taken from
the literature and converted to a common energy band, spectral model
and distance scale. Using this sample we fit the LX/LB relation
for early-type galaxies and find a best-fit slope for the catalogue of
∼2.2. We demonstrate the influence of group-dominant galaxies on the
fit and present evidence that the relation is not well modelled by a
single power-law fit. We also derive estimates of the contribution to
galaxy X-ray luminosities from discrete-sources and conclude that they
provide L(discrete-source-contribution)/LB∼29.5erg/s/LB☉. We
compare this result with luminosities from our catalogue. Lastly, we
examine the influence of environment on galaxy X-ray luminosity and on
the form of the LX/LB relation. We conclude that although
environment undoubtedly affects the X-ray properties of individual
galaxies, particularly those in the centres of groups and clusters, it
does not change the nature of whole populations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 53 425 Combined catalogue of X-ray luminosities
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See also:
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
J/ApJS/80/531 : An X-ray catalog and atlas of galaxies (Fabbiano+, 1992)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name of the galaxy
17- 24 A8 --- OName Other name
27- 32 F6.2 Mpc Dist Distance
34- 38 F5.2 [solLum] logLB Luminosity, based on BT magnitude
39 A1 --- n_logLB [*] *: LB luminosity is based on mB magnitude
41 A1 --- l_logLX Limit flag on logLX
42- 46 F5.2 [10-7W] logLX X-ray luminosity
48 A1 --- r_logLX [BFRN] Source of logLX value (1)
50- 53 F4.1 --- TType T-type from LEDA
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Note (1): Sources for X-ray luminosity as follows:
B = Beuing et al., 1999MNRAS.302..209B 1999MNRAS.302..209B
F = Fabianno et al., 1992, Cat. J/ApJS/80/531
R = Roberts et al., 1991ApJS...75..751R 1991ApJS...75..751R
N = new values from this paper
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 31-Jan-2002