J/A+A/445/465 ATCA 18.5 and 22GHz fluxes of Kuehr 5GHz sample (Ricci+, 2006)
High-frequency observations of the Kuehr sample and epoch-dependent luminosity
function of flat-spectrum quasars.
Ricci R., Prandoni I., Gruppioni G, Sault R.J., De Zotti G.
<Astron. Astrophys. 445, 465 (2006)>
=2006A&A...445..465R 2006A&A...445..465R
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Redshifts
Keywords: radio continuum: general - galaxies: nuclei - quasars: general -
galaxies: luminosity function, mass function
Abstract:
We discuss our ATCA 18.5 and 22GHz flux density measurements of
Southern extragalactic sources in the complete 5GHz sample of
Kuehr et al. (1981, Cat. VIII/5). The high frequency (5-18.5GHz)
spectral indices of steep-spectrum sources for which we have 18.5GHz
data (66% of the complete sample) are systematically steeper than the
low frequency (2.7-5GHz) ones, and there is evidence of an
anti-correlation of high-frequency spectral index with luminosity.
The completeness of 18.5GHz data is much higher (89%) for
flat-spectrum sources (mostly quasars), which also exhibit a spectral
steepening. Taking advantage of the almost complete redshift
information on flat-spectrum quasars, we have estimated their 5GHz
luminosity function in several redshift bins. The results confirm that
their radio luminosity density peaks at z_peak about 2.5 but do not
provide evidence for deviations from pure luminosity evolution as
hinted at by other data sets. A comparison of our 22GHz flux
densities with WMAP K-band data for flat-spectrum sources suggests
that WMAP flux densities may be low by a median factor of about 1.2.
The extrapolations of 5GHz counts and luminosity functions of
flat-spectrum radio quasars using the observed distribution of the
5-18.5GHz spectral indices match those derived directly from WMAP
data, indicating that the high frequency WMAP survey does not detect
any large population of FSRQs with anomalous spectra.
Description:
ATCA 18.5 and 22GHz flux density measurements of Southern sources in the
Kuehr sample. The flag in the last column indicates the reliability of the
18.5GHz measurements. Also listed are the 5GHz flux density and the
2.7-5GHz spectral index (from Kuehr et al. 1981, Cat. VIII/5), the
source type and redshift (from Stickel et al., 1994, Cat.
J/A+AS/105/211, plus some redshifts from NED).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 249 Radio fluxes, optical IDs and redshifts of
Southern Kuehr sources
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See also:
VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)
J/A+AS/105/211 : Optical identification status of 1Jy catalogue (Stickel+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- 1Jy 1Jy Source name (HHMM-DDd)
10- 14 F5.2 Jy S5GHz 5GHz flux density from Kuehr catalog
16- 20 F5.2 --- alpha 2.7-5GHz spectral index
22- 27 A6 --- Class Class of object (GALaxy, QSO, BL Lac)
29- 34 F6.4 --- z ?=- Redshift
36- 41 F6.3 Jy S18.5GHz 18.5GHz ATCA flux density
43- 47 F5.3 Jy e_S18.5GHz 18.5GHz ATCA flux density error
49- 54 F6.3 Jy S22GHz 22GHz ATCA flux density
56- 60 F5.3 Jy e_S22GHz 22GHz ATCA flux density error
62 A1 --- Ext [R-] Source extension label: R (resolved)
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Acknowledgements:
Roberto Ricci, Roberto.Ricci(at)csiro.au
(End) Roberto Ricci [ATNF, Australia], Patricia Vannier [CDS] 22-Sep-2005