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J/ApJ/405/498   Counts and spectral indices at 8.44GHz        (Windhorst+, 1993)

Microjansky source counts and spectral indices at 8.44 GHz WINDHORST R.A., FOMALONT E.B., PARTRIDGE R.B., LOWENTHAL J.D. <Astrophys. J. 405, 498 (1993)> =1993ApJ...405..498W (SIMBAD/NED Reference)
ADC_Keywords: Regional catalog; Radio sources Keywords: cosmic microwave background - galaxies: evolution - galaxies: starburst - radio continuum: galaxies - surveys Description: We used the VLA to make deep images of two 7x7' fields at 8.44 GHz with 10" resolution. With an rms noise of 3.2 and 5.1 {micro}Jy, respectively, in the two fields, we compiled a catalog of 82 sources. The normalized differential 8.44 GHz counts are similar to those at 1.41 and 4.86 GHz. All show a similarly steep submillijansky slope, which is only somewhat flatter than that expected for a nonevolving Euclidean population (γ=2.5). Microjansky radio sources at 4.86 GHz have been identified with faint blue galaxies (18≲V≲28 mag). We argue that their expected median redshift is about 0.5-0.75. Hence, cosmological evolution may be needed to explain the steep slope of the microjansky counts. The 8.44 GHz counts must converge with slope γ<2.0 below S(8.44)∼300 nJy, or they would exceed the available field galaxy counts down to V∼28 mag, and they must permanently converge below S(8.44)∼20 nJy, or their integrated sky brightness would distort the observed thermal cosmic background radiation spectrum at centimeter wavelengths. The estimated 31.5 GHz sky brightness from nanojansky to jansky levels is <36 {micro}K (3σ). Even if weak radio sources cluster on scales of degrees as faint galaxies do, their anisotropic contribution to the COBE DMR experiment (with 7deg FWHM-beam) would not exceed ∼1.2{micro}K. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a 111 47 Catalog of 8.44 GHz Radio Sources in the Linx.2 Field table1b 111 36 Catalog of 8.44 GHz Radio Sources in the Cepheus Field
Byte-by-byte Description of file: table1a table1b
Bytes Format Units Label Explanations
1- 6 A6 --- Name Source name 7 A1 --- n_Name [*] Source with an asterisk is not in the complete sample 10 I1 h RAh Right ascension (1950) 12- 13 I2 min RAm Right ascension (1950) 15- 19 F5.2 s RAs Right ascension (1950) 21- 24 F4.2 s e_RAs One sigma error on right ascension 26- 27 I2 deg DEd Declination (1950) 29- 30 I2 arcmin DEm Declination (1950) 32- 35 F4.1 arcsec DEs Declination (1950) 38- 40 F3.1 arcsec e_DEs One sigma error on declination 42- 48 F7.1 uJy S8.44 Integrated sky flux density at 8.44GHz 49- 55 F7.1 uJy e_S8.44 One sigma error on integrated sky flux density 57 A1 --- l_SizeM [<] When '<' the source is an unresolved source and it's given the 1.5σ upper limit on the Gaussian major axis 58- 61 F4.1 arcsec SizeM Deconvolved Gaussian source size (FWHM): major axis 63- 65 F3.1 arcsec e_SizeM []? Error on major axis 67- 70 F4.1 arcsec Sizem []? Deconvolved Gaussian source size (FWHM): minor axis 72- 74 F3.1 arcsec e_Sizem []? Error on minor axis 76- 78 I3 deg PA []? Position angle of major axis 80- 81 I2 deg e_PA []? Error on position angle 83- 86 F4.2 --- Weight Source weight in the 8.44 GHz counts 88- 93 F6.2 uJy S(p) Measured peak flux density on the 10arcsec resolution image 95- 98 F4.2 uJy e_S(p) One sigma error on measured peak flux density 100-105 F6.2 uJy S(int) Resulting integrated flux density on the 10 arcsec image 107-111 F5.2 uJy e_S(int) One sigma error on resulting integrated flux density
Historical Notes: * March 1993: Number A075 in H. Andernach's list, transformed from original LaTeX provided by the author * Completed at CDS
(End) James Marcout, Simona Mei [CDS] 11-May-1995
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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