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 (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) 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:
FileName Lrecl Records Explanations
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
See also: J/MNRAS/260/202 : Quasar luminosity function (Hawkins+, 1993) Byte-by-byte Description of file: table1a table1b table1c
Bytes Format Units Label Explanations
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
Note (1): The variability parameter s measures the significance of variability and is typically 10 times the amplitude of variation.
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 18-Feb-1997
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|