/ftp/cats/aliases/G//GHM2003_1_



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J/ApJS/149/29       ROSAT North Ecliptic Pole Survey         (Gioia+, 2003)
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	table3.dat notes.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/149/29
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Beginning of ReadMe : J/ApJS/149/29 ROSAT North Ecliptic Pole Survey (Gioia+, 2003) ================================================================================ The ROSAT North Ecliptic Pole Survey: the optical identifications. Gioia I.M., Henry J.P., Mullis C.R., Bohringer H., Briel U.G., Voges W., Huchra J.P. <Astrophys. J. Suppl. Ser. 149, 29 (2003)> =2003ApJS..149...29G ================================================================================ ADC_Keywords: Surveys ; Radio sources ; Redshifts ; Cross identifications Keywords: BL Lacertae objects: general- catalogs - galaxies: clusters: general - surveys - X-rays: general - X-rays: stars Abstract: The X-ray data around the North Ecliptic Pole (NEP) of the ROSAT All Sky Survey have been used to construct a contiguous area survey consisting of a sample of 445 individual X-ray sources above a flux of  2x10^-14^erg/cm^2^/s in the 0.5-2.0keV energy band. The NEP survey is centered at RA=18:00 (2000) DE=+66:33 and covers a region of 80.7deg^2^ at a moderate Galactic latitude of b=29.8deg. Hence, the NEP survey is as deep and covers a comparable solid angle to the ROSAT serendipitous surveys but is also contiguous. We have identified 99.6% of the sources and determined redshifts for the extragalactic objects. In this paper we present the optical identifications of the NEP catalog of X-ray sources including basic X-ray data and properties of the sources. We also describe with some detail the optical identification procedure. The classification of the optical counterparts to the NEP sources is very similar to that of previous surveys, in particular the Einstein Extended Medium Sensitivity Survey (EMSS). The main constituents of the catalog are active galactic nuclei (AGNs) ( 49%), either type 1 or type 2 according to the broadness of their permitted emission lines. Stellar counterparts are the second most common identification class ( 34%). Clusters and groups of galaxies comprise 14%, and BL Lacertae objects 2%. One non-AGN galaxy and one planetary nebula have also been found. The NEP catalog of X-ray sources is a homogeneous sample of astronomical objects featuring complete optical identification. Description: The NEP region was observed many times by the ROSAT satellite since the RASS scan pattern overlapped at the ecliptic poles. While the mean RASS exposure time across the entire sky is approximately 400s, the NEP region exposure time approaches 40ks at the pole. The minimum, median, and maximum exposure times in the NEP survey regions are 1.7, 4.8, and 38ks, respectively.