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Clark Lake Survey at 30.9 MHz [ CATS home ] [ Back to CATS list ] [ ftp ]

1988ApJS...68..715Kassim

The Clark Lake 30.9 MHz Galactic plane survey

Namir Kassim

Abstract

The Galactic plane has been mapped at 30.9 MHz with the Clark Lake TPT telescope giving unprecedented resolution for such a low frequency. The synthesized beam is 13'x11.1' at the zenith. Contour maps and a source list are presented for the regions 350^o <l < 59^o, 84^o <l < 97, and 133^o < l < 250, with |b| <=2^o-3^o. The source list contains integrated flux debnsities and positions for 702 discrete emission regions. Sensitivity is confusion limited and varies from ~5 Jy/beam in the inter Galaxy to ~1-2 Jy/beam toward the outer Galaxy.

Flux Density Calibrators 

name   RAhh mm  DECdd mm    Flux Jy
3C18     00 38     09 48    76.3  20%
3C75     02 55     05 51   110.3  20%
3C78     03 06     03 55    64.7  13%
3C98     03 56     10 18   185.0  13%
3C135    05 12     00 53    73.0  29%
3C223    09 37     36 10    65.0  29%
3C334    16 18     17 32    86.8  30%
3C346    16 42     17 21    50.9  11%
3C403    19 50     02 23   111.6  23%

Description of source list

The source list which accompanies the countour maps is presentede in Table 4 and lists 702 small-to-medium-diameter (< 2^o) discrete emission sources. The first column identifies the sources based on their position in Galactic longiture and latitude to the nearist tenth of degree or to approximately one-half of a beamwidth. The prefix NEK (after the author) has been attached in order to distinguish this catalog from preceding and following ones. Columns 2 and 3 are RA and Dec (epoch 1950.0). The typical positional accuracy is ~5'-10'. However, offsets of up to 15'-20' remain for a few field that could not be corrected for the effects of ionospheric refraction.

A "p" in the forth column indicates that the source is unresolved. The last column provides the most likely higher frequiency identification of the source if one is avalable. The following abbreviations for source identifications have been used: SNR supernova remnants fromn Green's catalog.
W Wsterhout 1958
Cul Culgura catalogs.
3C Bennett, 1963
4C Goger Scott amd Wills 1967; Pilkington and Scott 1964;
BG Bologna catalog. Fanti et al. 1974 . 

 TABLE 4 SOURCE LIST
 NEK #      R.A.   Dec   D  S30.9   Remarks
  3.4-1.7   1757  -26.9      14.2
  4.7+1.7   1747  -24.0      17.3
  5.4+1.1   1750  -23.7  p   27.2
  5.6-1.0   1938  -24.6     144.3   G5.3-1.0,SNR