% Documentation for The 6C Survey of Radio Sources - V.  The 
% Zones 6C-Va (48d<Dec<+68d, 01h34m<RA<06h14m) and 6C-Vb
% 6C-Vb (48d<Dec<+68d, 17h16m<RA<20h24m). (Hales, Masson, Warner,
% Baldwin and Green 1993)
%
% Document Number:
% Written: October 1993  by N. A. Oliversen
% TeX Ver: October 1993 by N. A. Oliversen
%
\documentstyle [adc,11pt]{article}
%
\newcommand{\cat}{The 6C Survey of Radio Sources - V.  The Zones
  6C-Va  (48\degree\ $<$ Dec $<$ 68\degree, 01$^{h}$34$^{m}$ $<$ RA $<$ 
06$^{h}$14$^{m}$)
 and 6C-Vb  (48\degree $<$ Dec $<$ 68\degree, 17$^{h}$16$^{m}$ $<$ RA 
$<$ 20$^{h}$24$^{m}$)}
\newcommand{\abbr}{6CV}
\newcommand{\prefp}{Hales, Masson, Warner, Baldwin, and Green (1993)}
\newcommand{\docnum}{ADC }
%
\begin{document}
%
\title{The 6C Survey of Radio Sources - V.  The Zones
  6C-Va \\  (48\degree\ $<$ Dec $<$ 68\degree, 01$^{h}$34$^{m}$ $<$ RA $<$ 
06$^{h}$14$^{m}$)
 and 6C-Vb \\ (48\degree $<$ Dec $<$ 68\degree, 17$^{h}$16$^{m}$ $<$ RA 
$<$ 20$^{h}$24$^{m}$)}
\author{\prefp}              
\docauthor{N. A. Oliversen}
\date{October 1993 \\ Revised March 1994}
\docno{NSSDC/WDC-A-R\&S 93-32}
\maketitle
\date{}

\begin{abstract} This catalog contains the fifth section of the 6C
Cambridge survey of radio sources at 151 MHz (6CV).  This part of the survey
covers two regions: 48\degree $<$ Dec $<$ 68\degree,
01$^{h}$34$^{m}$ $<$ RA $<$ 06$^{h}$14$^{m}$ [6CVa] and 
48\degree $<$ Dec $<$ 68\degree, 17$^{h}$16$^{m}$ $<$ RA $<$20$^{h}$24$^{m}$
[6CVb]. The limiting flux density is generally
170 mJy. The catalog data include the source positions (B1950), peak 
flux density, integrated flux density, contour map panel number, contour 
map field names, and integrated flux flag.  The two regions together list 
a total of
3458 sources (2229 in 6CVa and 1229 sources in 6CVb).  
The 6CV catalog consists of two files:  one file contains the 6CVa and
the second file contains the 6CVb.

\end{abstract}

\section{Introduction}

{\bf A copy of this document should be distributed with every 
copy of the machine-readable catalog.}

\subsection {Description}

{\it \cat (\abbr)} contains a compilation of radio source observations
made with the use of an (non-tracking) Earth-rotation aperture
synthesis telescope comprising many small aerial arrays on an
east-west baseline operating at 151 MHz.  This paper is the fifth  in
a  series of papers giving radio source observations at 151 MHz.  See
the discussion in 6CI (Baldwin et al. 1985) for details on the design
and operation of the telescope and the initial generation of the
survey.  Other papers in this series include 6CII (Hales et al. 1988),
6CIII (Hales et al. 1990), 6CIV (Hales et al. 1991), and 6CVI (Hales
et al. 1993b). 

The 6CV catalog contains a total listing of 3458 radio sources
ordered by increasing right ascension.  The survey is centered on a
declination of 58\degree\ to facilitate calibration using Cassiopeia A.
 The 6CVa covers the region 48\degree$<Dec<$ 68\degree,
$01^{h}34^{m}<RA<06^{h}14^{m}$, and the 6CVb covers
48\degree$<Dec<$ 68\degree, $17^{h}16^{m}<RA<20^{h}24^{m}$.  
Both of the 6CV regions have some overlap in right ascension
with the 6CIII catalog so that 396 sources have alternative entries
in both catalogs.  In addition, there is some overlap with the 6CIV
paper in this series. 

Positional calibration was effected as for 6CIII (Hales et al. 1990)
and give corrections of similar magnitude.

Flux densities are on the scale of Roger et al. (1973).
Provisional flux densities were corrected for the measured
receiver gain at a declination of 58\degree\ as a function of right
ascension. The final flux densities were adjusted to be consistent
with published radio source lists and were adjusted for consistency
with overlapping regions in the 6CIII, 6CIV, and the 6CVI catalogs. See
\abbr\ for additional flux calibration details. 

Note that these two sections of the 6CV submitted to the ADC contain
only the listing of radio sources and not the radio maps.  The
radio source lists are intended to be used with the radio maps 
originally published on microfiche in \prefp. 

\subsection{Reference}
\begin{references}
\item Hales, S. E. G., Masson, C. R., Warner, P. J., Baldwin, 
J. E., and Green, D. A. 1993, MNRAS, 262, 1057

\end {references}

\section {Structure}
\subsection{The File as a Whole}

{\it \cat} consists of two fixed-block files.  The 6CVa consists of
2229 52-byte records, and the 6CVb consists of 1229 52-byte records.
Descriptions of some of the fields in the file are given in the
following section. The record format is the same for the 6CVa and 6CVb.

\subsection{Catalog File}

\begin{table}[h]
\centering
\begin{tabular}{ c c c l }
\hline\hline
         &         &Suggested &                \\
Bytes    & Units   &  Format  & \multicolumn{1}{c}{Item}     \\
\hline
 1- 2    & h       & I2    & Right ascension (B1950)  \\
 4- 5    & min     & I2    & Right ascension (B1950) \\
 7-10    & s       & F4.1  & Right ascension (B1950) \\
12-14    & \degree\  & I3    & Declination (B1950) \\
16-17    & $'$     & I2    & Declination (B1950) \\
19-20    & $''$    & I2    & Declination  (B1950) \\
23-27    & Jy      & F5.2  & Flux density (peak)  \\ 
30-34    & Jy      & F5.2  & Flux density (integrated) \\
37-39    &         & I3    & Contour map panel number\\
42-48    &         & A7     & Contour map field name \\
   51    &         & A1    & Integrated flux flag \\
\hline\hline
\end{tabular}
\caption{Catalog Record Format}
\label{t:catfig}
\end{table}

{\bf Flux density (peak):} Source peak flux density at 151 MHz.

{\bf Flux density (integrated):} Source integrated flux density
at 151 MHz.   

\pagebreak

{\bf Contour map panel number:} This column contains the name of the
map panel in which the source appears.  The panel number and map field
name tell the user where to look up the source of interest in the
published contour map.  Typically, each map is divided into 32 panels,
although the 0300+58 map contains panel numbers up to 36, presumably
from an adjoining region (see Figure 4 in 6CV).  A panel number listed
with a negative sign indicates that the data are accommodated at the
location but come from another map or area of sky. 

{\bf Contour map field names:} This column contains the name of the 
field in which the source appears.  Three fields have been included in 
this survey: 0300+58, 0500+58 for 6CVa and 1900+58 for 6CVb.
The panel number and map field name tell the user where to look up
the source of interest in the published contour map.

{\bf Integrated flux flag:}  A dash (-) indicates that the
peak flux was not strong enough to calculate the integrated flux.
An asterisk (*) indicates that the peak flux
was strong enough to qualify for integration, but it has been
integrated into a brighter adjoining peak.  


\section{History}

\subsection{Remarks and Modification}

{\it \cat} was received by the Astronomical Data Center (ADC), NASA
Goddard Space Flight Center, from Dr. Heinz Andernach.
The catalog was originally submitted by Dr. Sally Hales.

The integrated flux flag column was generated by the ADC by editing
the original integrated flux field and moving the character flags to a
separate column.   This was done to avoid the mixing of characters and
numbers in a single field. 


\section{Reference to the Documentation}
\begin{references}
\item {Baldwin, J. E., Boysen, R. C., Hales, S. E. G., Jennings, J. E.,
Waggett, P. C., Warner, P. J., and Wilson, D. M. A.  1985, MNRAS, 217, 
717}
\item {Hales, S. E. G., Baldwin, J. E., and Warner, P. J. 1988, MNRAS, 
234, 919 }
\item {Hales, S. E. G., Masson, C. R., Warner, P. J., and Baldwin, J. E.
  1990, MNRAS, 246, 256}
\item {Hales, S. E. G., Mayer, C. J., Warner, P. J., and Baldwin, J. E.
  1991, MNRAS, 251, 46}
\item {Roger, R. S., Bridle, A. H., and Costain, C. H. 1973, AJ, 78, 
1030}
\item {Hales, S. E. G., Masson, C. R., Warner, P. J., Baldwin, J. E.,
and Green, D. A. 1993a, MNRAS, 262, 1057}
\item {Hales, S. E. G., Baldwin, J. E., and Warner, P. J. 1993b, MNRAS,
263, 25}

\end{references}
\end{document}