Investigating statistical and spectral characteristics of the radio sources from the RadioAstron catalog at millimetric wavelengths

We consider some statistical characteristics of radio sources at 22 GHz in the framework of the preparatory works on the RadioAstron space mission. The expected density of radio sources with inverted spectra is estimated. Based on the observations of the radio sources from the preliminary RadioAstron sample, we compare the expected and measured angular densities of the radio sources with inverted spectra. The optical characteristics of the objects with inverted spectra and of the sources from the complete sample are compared as well. We present some spectral parameters of the radio sources observed at two different frequencies. Some conclusions about the completeness and reliability of the preliminary RadioAstron catalog are made.

[1]  The radio source counts at 15 GHz and their implications for cm-wave CMB imaging , 2001, astro-ph/0102497.

[2]  P. Gregory,et al.  The GB6 Catalog of Radio Sources , 1996 .

[3]  Richard L. White,et al.  The FIRST Survey: Faint Images of the Radio Sky at twenty centimeters , 1995 .

[4]  9C: a survey of radio sources at 15 GHz with the Ryle Telescope , 2003, astro-ph/0304275.

[5]  N. S. Nesterov,et al.  Five years monitoring of extragalactic radio sources. II. Quiescent spectra and the evolution of outbursts. , 1988 .

[6]  Edward J. Wollack,et al.  First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Foreground Emission , 2003, astro-ph/0302208.

[7]  Richard J. Davis,et al.  Source subtraction for the extended Very Small Array and 33-GHz source count estimates , 2004, astro-ph/0412605.

[8]  D. Mouillet,et al.  (DOI: will be inserted by hand later) , 2002 .

[9]  G. W. Torrence,et al.  The Texas Survey of Radio Sources Covering -35.5 degrees < declination < 71.5 degrees at 365 MHz , 1996 .

[10]  A Fast Gridded Method for the Estimation of the Power Spectrum of the Cosmic Microwave Background from Interferometer Data with Application to the Cosmic Background Imager , 2002, astro-ph/0205385.

[11]  China.,et al.  Black hole mass and binary model for BL Lac object OJ 287 , 2002, astro-ph/0212475.

[12]  P. P. van der Werf,et al.  Submillimeter Observations of Distant Red Galaxies: Uncovering the 1 mJy 850 μm Population , 2005, astro-ph/0509104.

[13]  C. Bennett,et al.  5 GHz Radio Structure and Optical Identifications of Sources from the MG Survey. II. Maps and Finding Charts , 1986 .