VIII/27 Parkes-MIT-NRAO (PMN) Surveys (Griffith+ 1994)
The Parkes-MIT (PMN) Surveys:
I. The 4850MHz Surveys and data reduction (PAPER 1)
GRIFFITH M.R., WRIGHT A.E.
<Astron. J. 105, 1666 (1993)>
II. Source catalog for the Southern Survey (PAPER 2)
WRIGHT A.E., GRIFFITH M.R., BURKE B.F., EKERS R.D. : 1994
<Astrophys. J. Suppl. Ser. 91, 111 (1994)>
III. Source catalog for the Tropical Survey (PAPER 3)
GRIFFITH M.R., WRIGHT A.E., BURKE B.F., EKERS R.D.: 1994
<Astrophys. J. Suppl. Ser. 90, 179 (1994)>
=1993AJ....105.1666G 1993AJ....105.1666G 1994ApJS...90..179G 1994ApJS...90..179G 1994ApJS...91..111W 1994ApJS...91..111W
Abstract of Paper II:
We present a catalog of radio sources discovered at a frequency of
4850 MHz in the Southern zone (-87.5 < DEC < -37 ) of the
Parkes-MIT-NRAO (PMN) survey. This survey covers 2.50 sr and
contains 23,277 sources to a flux limit which varies as a function
of declination from 20 mJy at the southern survey limit to about
50 mJy at the northern limit. The new survey increases the number
of radio sources known in the area surveyed by a factor of ∼5 over
those found by either of the earlier Parkes or Molonglo surveys.
We described our data taking and reduction methods for the PMN
survey in a previous paper. In this paper we tabulate the sources
for the Southern Survey. Instructions are also given for obtaining
the data in machine-readable form. Later papers in the series will
list objects for other survey zones and provide analysis of the
data.
Abstract of Paper III:
We present a catalog of radio sources discovered at a frequency of
4850 MHz in the Tropical zone (-29 < dec < -9.5 deg ) of
Parkes-MIT-NRAO (PMN) Surveys. The Tropical Survey covers 2.01 sr
and contains 13,363 sources to a flux limit that is, typically,
about 42 mJy but varies as a function of declination. The survey
was made using the Parkes 64 m radio telescope with the NRAO
multibeam receiver during 1990. This survey increases the number
of known sources in the region surveyed by approximately a factor
of 5. The data taking and principal reduction methods used for the
PMN Surveys have been extensively described in a previous paper
(Griffith & Wright 1993; hereafter "Paper 1"). In this paper, we
describe the specific details of the Tropical Survey and we list
the sources for the Tropical Survey. Later papers in the series
will list objects for other survey zones, describe images made
from the data, and provide analysis of the data.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
pmnsouth 96 23277 The Southern (-87.5 to -37 degrees) Survey
pmntrop 96 13363 The Tropical (-29 to -9.5 degrees) Survey
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Byte-per-byte Description of file: pmnsouth
Byte-per-byte Description of file: pmntrop
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Bytes Format Units Label Explanations
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1- 14 A14 --- PMNJ J2000-derived source name (PMNJhhmm-ddmma).
16- 17 I2 h RAh Right Ascension J2000 (hours)
19- 20 I2 min RAm Right Ascension J2000 (minutes)
22- 25 F4.1 s RAs Right Ascension J2000 (seconds)
27 A1 --- DE- Declination J2000 (sign)
28- 29 I2 deg DEd Declination J2000 (degrees)
31- 32 I2 arcmin DEm Declination J2000 (minutes)
34- 35 I2 arcsec DEs Declination J2000 (seconds)
38- 43 I6 mJy Flux [20/100053] 4850 MHz flux density derived
from the Fixed-Width fit (see Paper 1)
46- 47 I2 mJy e_Flux estimated standard error of above Flux (1)
50- 55 I6 mJy Gflux [71/84049]? general-width flux (2)
58- 59 I2 mJy e_Gflux []? error of general-width flux (2)
62- 64 F3.1 --- Wid1 [0.8/5]? fitted major source extent (3)
67- 69 F3.1 --- Wid2 [0.8/5]? fitted minor source extent (3)
72- 76 F5.1 deg Ang [0/180[? position angle of source (3)
78- 81 F4.1 --- SI [-4.5/2.6]? Spectral index alpha defined by
S(v) ∝ v**alpha
computed from the present PMN fluxes at 4850
MHz and the 2700 MHz flux from PKSCAT90
84 A1 --- FlagD [JN] Session in which the source was observed:
"J" indicates the June 1990 session
"N" indicates the November 1990 session
86 A1 --- FlagX [X] "X" indicates that the source is
probably extended.
88 A1 --- FlagG [G] "G" indicates that the source lies
within 10 deg of the Galactic plane.
90 A1 --- FlagZ [Z] "Z" indicates a source which was
observed within 6 deg of the Parkes
telescope's zenith and has a
flux < 60 mJy.
92 A1 --- FlagS [S] "S" indicates that the source lies
within 5 deg of solar contamination
from the telescope's sidelobes and
the data listed may be of lower quality.
94 A1 --- FlagP [P] "P" indicates that this source lies
within 2' of a source listed in the
PKSCAT90 database and is probably
the same object.
96 A1 --- FlagM [M] "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.
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Note (1):
The error column gives the estimated standard error of the above flux.
A standard error >99 mJy is listed as 99 mJy because of space limitations.
We estimate the standard error (s.e.) on the flux density of a source
(in mJy) to be: (s.e.)^2 = (EF)^2 + (2)^2 + (0.016.S)^2 + (EB)^2
where EF is the flux fitting error, the factor of 2 is the error from
confusion, the factor of 0.016 is the gain error, and EB is an error
resulting from uncertainties in the flux bias correction. Typically,
EB was 1 mJy or 0.6log(S/mJy) mJy, whichever was greater. The flux fitting
error, EF, was determined from our Monte Carlo simulations in each
declination band and can be approximated for the Southern Survey by:
(EF)^2 = (11.8 + 0.085*dec)^2 + (0.050*S)^2
where S is in mJy and dec is the declination in degrees.
Note (2):
These columns give the 4850 MHz flux density and its error from the
"General fit". This fit was made to sources having flux densities
above 100 mJy and positions within 3' of the local maximum based on the
fixed-width fit. This fit was done to detect and measure genuinely
extended astronomical objects. We fitted a Gaussian having peak flux
density, position, semi-major axis, semi-minor axis, and position angle
as free parameters. However, because of the number of degrees of freedom
permitted, the General fit was only meaningful for stronger sources.
Note (3):
Wid1 is the maximum source half-power width normalized by the telescope
beamwidth of 4.2arcmin; Wid2 is the minimum source half-power width
normalized by the telescope beamwidth; and position angle is that of
the source's maximum dimension measured in the standard sense of North
through East (in degrees). Note that the normalized widths of sources
have a standard error of about 0.2, particularly for the weaker objects.
References:
Large et al. 1981, MNRAS 194, 693 (CDS catalogue VIII/16)
Wright, A. E. & Otrupcek, R. E., eds.,1990, ATNF, "PKSCAT90 - the
Southern Radio Database", (Sydney: ATNF). (CDS catalogue VIII/15)
See also:
VIII/15 : PKSCAT90
VIII/16 : MRC Catalogue
J/ApJS/90/173 : PMN map catalog of radiosources, Gregory et al., 1994
J/ApJS/97/347 : PMN Equatorial Survey -9.5/+10.0deg, Griffith et al., 1995
Courtesy: Mark Griffith
(End) Heinz Andernach, Francois Ochsenbein [CDS] 09-May-1994