CDROM/APJS/V93/P145 Radio Survey Around North Ecliptic Pole (Kollgaard+ 1994) ================================================================================ A Sensitive 1.5 GHz Radio Survey Around the North Ecliptic Pole Ronald I. Kollgaard, Wolfgang Brinkmann, Margaret Mcmath Chester, Eric D. Feigelson, Paul Hertz, Patricia Reich, & Richard Wielebinski <1994, ApJS, 93, 145> =1994ApJS...93..145K ================================================================================ Abstract: A 29.3 deg^2 region surrounding the north ecliptic pole (NEP; R.A.=18h00m, Dec.=+66d30m) was mapped with the Very Large Array 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 deg have noise levels sigma ~= 60 uJy, and the 85 fields centered between 1.5 deg and 3.0 deg from the NEP have sigma ~= 120 uJy. 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 the NASA Extragalactic Database and find counterparts for ~18% of the VLA-NEP objects. The normalized, differential radio source count is in agreement with the previous studies. Between 1 and 150 mJy the slope of the log N-log S relation is 0.68 +/- 0.03. The catalog and related tables are available electronically. Keywords: catalogs -- radio continuum: general -- surveys -- X-rays: general catalogs -- ultraviolet: stars File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table2.dat 133 2435 VLA-NEP source catalog table3.dat 110 416 VLA-NEP sources with possible identifications -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-12 A12 --- Name VLA-NEP source name (J2000) 13-17 I5 --- Field VLA-NEP field designation 18 1X --- --- Blank 19-21 I3 h RAh Right Ascension, J2000 (corrected) 22-24 I3 min RAm R.A. 25-30 F6.2 s RAs R.A. 31 1X --- --- Blank 32 A1 --- DE- Sign declination, J2000 33-34 I2 deg DEd Declination, J2000 35-37 I3 arcmin DEm Dec. 38-42 F5.2 arcsec DEs Dec. 43-47 F5.1 arcsec e_Pos Net positional uncertainty 48-53 F6.1 arcmin Dis Distance of the source from the field center 54-60 F7.1 mJy S_total Corrected integrated flux density 61-65 F5.1 mJy e_S_total rms error in S_total 66-72 F7.1 mJy S_peak Corrected peak flux density 73-77 F5.1 mJy e_S_peak rms error in S_peak 78-82 I5 --- SNR Signal-to-noise ratio of the detection 83-84 2X --- --- Blank 85-86 A2 --- ID 'ID'= identification listed in table 3 87 1X --- --- Blank 88-133 A46 --- Note *Additional notes -------------------------------------------------------------------------------- Notes for file: table2.dat -------------------------------------------------------------------------------- Note: S = suspect source which lies on an image processing artifact D = double source, either a blend of two comparable sources or two resolved peaks with a common envelope D?= possible double whose features appear at less than 8 x sigma E = extended source, either an elongated source or an object with an asymmetric or complex shape E?= possible extended source, whose features appear at less than 8 x sigma Also included is the angular separation (arcminutes) between the peaks of double sources, the angular size of extended sources (measured from the peak to the most distant feature, minus a slight resolution correction), and the position angle (degrees) measured from the brightest peak. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-12 A12 --- Name *VLA-NEP source, see table 2, field ID 13-19 F7.1 mJy Flux VLA-NEP total flux density 20 1X --- --- Blank 21-29 A9 --- BWE91 *BWE91 name 30-31 2X --- --- ' (' 32-34 I3 mJy BWE91_S []? BWE91 cataloged flux density 35-36 2X --- --- ') ' 37-39 A3 --- LRW88 *LRW88 name 40-41 2X --- --- ' (' 42-44 I3 mJy LRW99_S []? LRW88 cataloged flux density 45-46 2X --- --- ') ' 47-55 A9 --- WB92 *WB92 name 56-57 2X --- --- ' (' 58-60 I3 mJy WB92_S []? WB92 cataloged flux density 61-62 2X --- --- ') ' 63-70 A8 --- LRW92 *LRW92 name 71 1X --- --- Blank 72-87 A16 --- NED *NASA Extragalactic Database name 88-89 2X --- --- ' (' 90-93 F4.1 mag NED_V []? NED visual magnitude 94 1X --- --- ')' 95-100 F6.2 --- SI1 []? Spectral index between 1.5 GHz and 5 GHz 101-106 F6.2 --- SI2 []? Spectral index between 1.5 GHz and 2.7 GHz 107-108 2X --- --- Blank 109-110 I2 --- Ref *Reference number -------------------------------------------------------------------------------- Notes for file: table3.dat -------------------------------------------------------------------------------- Name: If the source name fiels is blank, fields NED, NED_V, SI1, SI2, and Ref are continuations from the previous record BWE91: Name of any 5 GHz counterpart from Becker, White & Edwards 1991 ApJS, 75, 1 LRW88: Name of any 2.7 GHz Effelsberg counterpart from Loiseau et al. 1988, A&AS, 75, 67 WB92: Name of any 1.4 GHz counterpart from White & Becker 1992, ApJS, 79, 331 LRW92: Name of any 8C couterpart from Lacy, Rawlings & Warner 1992, MNRAS, 256, 404 NED: Name of any NASA Extragalactic Database counterpart that is not from the four previous surveys Ref: Reference number for sources with information from NED 1 Lacy, Rawlings, & Warner 1992, MNRAS, 256, 404 2 Zwicky & Herzog 1968, Catalogue of Galaxies and Clusters of Galaxies (Pasadena: California Institute of Technology) 3 Joint IRAS Science Working Group 1988, Infrared Astronomical Satellite Catalogs, The Point Source Catalog (ver. 2) (NASA RP-1190) 4 Kojoian et al. 1981, AJ, 86, 820 5 Moshir et al 1990, Infrared Astronomical Catalogs, The Faint Source Catalog (ver. 2) 6 Ashby, Houck, & Hacking 1992, AJ, 104, 980 7 Nilson 1973, Uppsala General Catalogue of Galaxies, Acta Universitatis Upsalienis, Nava Regiae Societatis Upsaliensis, Series V: vol. 1 8 Abell, Corwin, & Olowin 1989, ApJS, 70, 1 9 Vorontsov-Velyaminov & Krasnogorskaja 1962, Morphological Catalogue of Galaxies (Moscow: Moscow State University) 10 Sovers et al. 1988, AJ, 95, 1647 11 Clements 1983, MNRAS, 204, 811 12 Dressel & Condon 1976, ApJS, 31, 187 13 Takase & Miyauchi-Isobe 1989, Pub. Nat. Astr. Ast. Obs. Japan, 1, 97 14 Russell et al. 1990, AJ, 99, 2059 15 Burg et al. 1992, A&A, 259, L9 16 Zwicky 1971, Catalogue of Selected Compact Galaxies and Post-Eruptive Galaxies (Zurich: Offsetdruck L. Speich) 17 Tsvetkov & Bartunov 1993, Bull Inf. Centre Donnes Stellaires, 42, 17 -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 10-Oct-94