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1994ApJS...93..145Kollgaard+

A Sensitive 1.5 GHz Radio Survey Around the North Ecliptic Pole

Kollgaard R.I., W.Brinkmann, M. McMath Vhester, E.D. Feigelson, P. Hertz, P. Reich and R. Wielebinski

Abstract

A 29.3 deg^2 region surrounding the north ecliptic pole (NEP; RA=18h00m, dec = 66^o30') was mapped with VLA at 1.5 GHz to support the deepest portion of the ROSAT all-sky soft X-ray survey. The resulting VLA-NEP survey catalog contains 2435 radio sources with flux densities in the range of 0.3-1000 mJy, including over 200 fainter than 1 mJy. The 28 fields of the inner 1.5^o have noise levels sigma =~60 muJy, and the 85 fields centered between 1.5^o and 3.0^o from the NEP have sigma =~120 muJy. The typical spatial resolution is 20" HPBW, and most positions are accurate to < 2". Approximately 6% of the sources are found to be extended with size >30". We have compared the VLA-NEP catalog with four other radio catalogs made at lower resolution, as well as with NASA Extragalactic Database and find counterparts for ~18 % of the VLA-NEP objects. The normalized, differentail radio source count is in agreement with previous studies. Between 1 and 150 mJy the slope of the logN - logS relation is 0.68+-0.03. The catalog and related tables are available electronically.

The VLA-NEP catalog

Table 2 gives the resulting VLA-NEP source catalog.
!     1        2    3 - 5       6 - 8      "    center  flux
+------------+------+------+------+------+------+------+-------+-------+------+--------+------------+--------+---------
|jname       |fld |ra 2000.   |dec 2000. | err |dis  |Stot  err|S_peak   err|snr|idf|susf|extf|ff|sep| pa |rel_name
+------------+-----------------------------+------+----+-----------+--------------+--+-------+---+------+------+-------
 J1726.3+6642   1 17 26 20.29  66 42 14.7  2.6  24.5   38.5  5.2   46.4  5.5  12                  0.0