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J/MNRAS/357/1267    bjur photometry and redshifts of QSOs   (Cirasuolo+, 2005)

Faint radio-loud quasars: clues to their evolution. Cirasuolo M., Magliocchetti M., Celotti A. <Mon. Not. R. Astron. Soc., 357, 1267-1280 (2005)> =2005MNRAS.357.1267C
ADC_Keywords: QSOs ; Radio sources ; Photometry ; Redshifts Keywords: galaxies: active - quasars: general - cosmology: observations - radio continuum: galaxies Abstract: The quasar sample selected by cross-correlating the Faint Images of the Radio Sky at Twenty cm (FIRST, VIII/71) survey and the 2-degree Field Quasar Redshift Survey (2QZ, VII/223) allows us to explore, for the first time, the faint end of the radio and optical luminosity functions up to z≃2.2. We find indications (∼3σ) of a negative evolution for these faint sources at z≳1.8, both in radio and optical bands. This corresponds to a decrement in the space density of faint quasars of approximately a factor 2 at z=2.2 and confirms the presence of a differential evolution for the population of radio-active quasars. The faint end of both luminosity functions flattens and the comparison with the (optical) number density of the whole quasar population supports a dependence of the fraction of radio-detected quasars on the optical luminosity. A progressive decrease in the fraction of quasars in the whole radio source population can be consistently accounted for within the receding torus scenario. The population of low-luminosity quasars, which the FIRST-2dF detects, appears to depart from the classical scheme for radio-loud quasars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 238 Optical and radio properties of the FIRST-2QZ quasar sample (not included in Cirasuolo et al. 2003, Cat. J/MNRAS/341/993)
See also: J/MNRAS/341/993 : ujbr photometry and redshifts of QSOs (Cirasuolo+, 2003) VII/223 : The 2dF QSO Redshift Survey. V. The 10k cat. (Croom+ 2001) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2dF 2dF name (JHHMMSS.s+DDMMSS) 18- 19 I2 h RAh Right ascension (J2000) 21- 22 I2 min RAm Right ascension (J2000) 24- 28 F5.2 s RAs Right ascension (J2000) 30 A1 --- DE- Declination sign (J2000) 31- 32 I2 deg DEd Declination (J2000) 34- 35 I2 arcmin DEm Declination (J2000) 37- 40 F4.1 arcsec DEs Declination (J2000) 42- 47 F6.3 mag bjmag bj magnitude 49- 54 F6.3 mag u-bj u-bj colour index 56- 61 F6.3 mag bj-r bj-r colour index 63- 70 F8.3 mJy S1.4GHz Radio-flux density at 1.4GHz 72- 76 F5.3 ---- z Redshift 78 A1 ---- Morph [dtm] Radio morphological appearance (1) 80- 85 F6.3 ---- alphaR ? Radio spectral index
Note (1): Notes as follows: d = double source (i.e. presenting the two characteristic lobes) t = core + lobes structure m = cases in which the source is decomposed in more than three substructures; this information has been obtained by visual inspection of the images of each radio object from the FIRST atlas.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Feb-2006
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

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