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PMN : Parkes-MIT-NRAO survey

Contents

Table name:     PMN
Records:        36640
Version:	(Southern and Tropical)
Spectral Band:  RADIO
Preview:           
Coordinates:    J2000

Reference:

Description

We describe radio surveys covering the sky from -87.5 degrees to +10 degrees declination made using the Parkes 64m radio telescope with the NRAO multibeam receiver at a frequency of 4850 MHz during 1990. We have fully reduced the data from Southern Survey (-87.5 degrees < delta < -37 degrees) and Tropical Survey (-29 degrees < delta < -9.5 degrees). Together, these surveys cover 4.51 sr and contains 36640 sources to a flux limit that is, typically, about 35mJy but varies as a function of declination. They increase the number of known sources in the regions surveyed by approximately a factor of 5.

Fields

  
Name        Type   Meaning                                                 
  
Name          c    The J2000-derived source name. The names in this list 
                   have been derived from their J2000 coordinates, in a
                   manner similar to that used in the PKSCAT90 catalog 
                   (Wright & Otrupcek, 1990). The first three
                   letters, "PMN", denote the Parkes-MIT-NRAO survey,
                   and the fourth letter, "J", denotes that the equinox 
                   and equator is J2000. The rest of the name is derived 
                   from the hours and minutes of the right ascension
                   and the degrees and minutes of the declination (both J2000). 
                   For a few objects, the name (but not the sources) is duplicated:
                   in such cases we have appended an "a" or "b" to the name. 
r_a           i    The J2000 right ascension 
dec           i    The J2000 declination    
Flux          i    The 4850 Mhz flux density in mJy derived from the
                   Fixed-Width fit (see paper 1 )   
e_flux        i    The estimated standard error of the above flux.
                   (A standard error > 99 mJy is listed as 99 mJy
                   because of space limitations : the accurate
                   value can be obtained from the equation given
                   in : 2.) 
SI            f    The spectral index, computed between the present
                   PMN fluxes at 4850 MHz and the 2700 MHz flux
                   from PKSCAT90, for sources common to both
                   database 
notes         c    Notes with the following meaning:
                   

                    D  the session in which the source was observed.
                   "J" indicates the June session and "N" the November session.                     
                   X  an "X" indicates that the source is probably extended.
                        This information is only available for sources whose 
                        Fixed-Width fit fluxes, before the application of the
                        flux bias corrections (see Paper 1), were stronger than 
                        100 mJy.
                   G  a "G" indicates that the source lies within 10 degrees 
                        of the Galactic plane.
                   Z  a "Z" indicates a source which was observed within 6
                        degrees of the Parkes telescope's zenith and has a 
                        flux < 60 mJy. Such objects may be affected by residual
                        problems in baseline removal and the data may be of
                        lower quality.
                   S  an "S" indicates that the source lies within 5 degrees 
                        of solar contamination from the telescope's sidelobes 
                        and the data listed may be of lower quality.
                   P  a "P" indicates that this source lies within 2' of a 
                        source listed in the PKSCAT90 database and is probably
                        the same object.
                   M  an "M" indicates that this source lies within 2' of a
                        source listed in the Molonglo 408 MHz catalog (Large et 
                        al. 1981) and is probably the same object.

For further information about these flags, see Paper 1.                                                              
Computed Fields                               
  
_ra           I    The B1950 right ascension 
_de           I    The B1950 declination            

REFERENCES