J/MNRAS/275/1102 Evolution of quasar luminosity function (Hawkins+ 1995)
The evolution of the quasar luminosity function
Hawkins M.R.S., Veron P.
<Mon. Not. R. Astron. Soc. 275, 1102 (1995)>
=1995MNRAS.275.1102H 1995MNRAS.275.1102H (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Magnitudes ; Redshifts
Keywords: galaxies: luminosity function, mass function - quasars: general
Abstract:
In an earlier paper (Hawkins & Veron, 1993MNRAS.260..202H 1993MNRAS.260..202H) we
presented quasar luminosity functions in three redshift bins, derived
from a variability selected sample. Here we provide a major extension
to this survey, with a view to improving statistics and completeness,
and extending the redshift range. The luminosity functions for
redshifts of less than 2.2 show a featureless power law of the form
φ=10β(M-M0_)^, with no sign of a 'break'. The quasar
luminosity function is also derived by the redshift range 2.2<z<3.2,
which again shows a featureless power law, but with a steeper slope.
When the data are combined with a new sample of bright quasars, the
quasar luminosity functions in all four redshift ranges are consistent
with a single power law of index β=0.63. Plots of quasar space
density as a function of redshift in three luminosity bins are also
presented and show strong evolution at low redshift but nearly
constant space density beyond a redshift of 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a 59 111 Quasars in the fibre field sample
table1b 58 117 Quasars in the bright sample
table1c 58 86 Quasars in the high-redshift sample
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See also:
J/MNRAS/260/202 : Quasar luminosity function (Hawkins+, 1993)
Byte-by-byte Description of file: table1a table1b table1c
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Bytes Format Units Label Explanations
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1- 3 I3 --- No Quasar number
5- 6 I2 h RAh Right ascension (1950)
8- 9 I2 min RAm Right ascension (1950)
11- 15 F5.2 s RAs Right ascension (1950)
17 A1 --- DE- Declination sign
18- 19 I2 deg DEd Declination (1950)
21- 22 I2 arcmin DEm Declination (1950)
24- 27 F4.1 arcsec DEs Declination (1950)
29- 33 F5.2 mag Bmag B magnitude in 1977
35- 39 F5.2 mag U-B ? U-B color index
41- 45 F5.2 --- s Variability parameter (1)
47- 51 F5.3 --- z Redshift
53- 58 F6.2 mag BMag Absolute B magnitude in 1977
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Note (1): The variability parameter s measures the significance of variability
and is typically 10 times the amplitude of variation.
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 18-Feb-1997