J/MNRAS/341/993 ujbr photometry and redshifts of QSOs (Cirasuolo+, 2003)
The radio-loud/radio-quiet dichotomy: news from the 2dF QSO Redshift Survey.
Cirasuolo M., Magliocchetti M., Celotti A., Danese L.
<Mon. Not. R. Astron. Soc. 341, 993 (2003)>
=2003MNRAS.341..993C 2003MNRAS.341..993C
ADC_Keywords: QSOs ; Radio sources ; Photometry ; Redshifts
Keywords: galaxies: active - quasars: general - cosmology: observations
Abstract:
We present a detailed analysis of a sample of radio-detected quasars,
obtained by matching together objects from the FIRST (VIII/71)
survey and the 2dF Quasar Redshift Survey (2dF, VII/223). The data
set consists of 113 sources, spanning a redshift range 0.35≲z≲2.2,
with optical magnitudes 18.25≤bj≤20.85 and radio fluxes
S1.4GHz≥1mJy. These objects exhibit properties such as redshift and
colour distribution in full agreement with those derived for the whole
quasar population, suggesting that the mechanism(s) controlling the
birth and lifetime of quasars are independent of their level of radio
emission. The long-debated question of the radio-loud/radio quiet
(RL/RQ) dichotomy is then investigated for the combined FIRST-2dF and
FIRST-LBQS (Large Bright Quasar Survey) samples, as they present
similar selection criteria.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 113 Optical and radio properties of the FIRST-2dF
quasar sample
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See also:
J/MNRAS/357/1267 : bJur photometry and redshifts of QSOs (Cirasuolo+, 2005)
VII/223 : The 2dF QSO Redshift Survey. V. The 10k cat. (Croom+ 2001)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 2QZ 2dF name, based on J2000 coordinates
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 27 F4.1 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 37 I2 arcsec DEs Declination (J2000)
39- 43 F5.3 arcsec Offset Radio-to-optical offset
45- 49 F5.2 mag bjmag bj magnitude
51- 55 F5.2 mag u-bj u-bj colour index
57- 61 F5.2 mag bj-r bj-r colour index
63- 68 F6.2 mJy S1.4GHz Flux density at 1.4GHz
70- 74 F5.3 --- z Redshift
76- 77 A2 --- Morph [dst ?] Morphological appearance (1)
79- 83 F5.2 --- Sp-Index ? Radio spectral index
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Note (1): Morphological appearance as follows:
d = double source (i.e. presenting the two characteristic lobes)
s = point-like source
t = core+lobes structure
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 12-Sep-2003