ROSATNEPID ivo://nasa.heasarc/rosnepoid NASA/GSFC HEASARC Gioia et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Optical Counterpart This table contains the ROSAT North Ecliptic Pole (NEP) Survey list of optical identifications. The X-ray data around the NEP from the ROSAT All-Sky Survey (RASS) were used to construct a contiguous area survey which consisted of a sample of 445 individual X-ray sources with fluxes more than ~2x10<sup>-14</sup> erg/cm<sup>2</sup>/s in the 0.5 - 2.0 keV energy band. The NEP survey is centered at RA= 18hr 00min Dec= +66deg 33', and covers a region of 80.7 square degrees at a moderate Galactic latitude b= 29.8 degrees. Hence, the NEP survey is as deep as and covers a comparable solid angle to the ROSAT serendipitous surveys but is also contiguous. The authors identified 99.6% of the sources and determined redshifts for the extragalactic objects. This table contains the optical identifications for the NEP catalog of X-ray sources, including basic X-ray data and properties of the sources. 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 (AGN) (~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. The data on AGN in this catalog are essentially superceded by the data in the more recent catalog of Mullis et al. (2004, ApJ, 617, 192), available in HEASARC Browse as the ROSNEPOID table (q.v.), in which, inter alia, a corrected count rate to flux conversion and a different cosmology were used. This table was created by the HEASARC in April 2005 based on CDS table J/ApJS/149/29/table3.dat This is a service provided by NASA HEASARC . 2003ApJS..149...29G https://heasarc.gsfc.nasa.gov/W3Browse/all/rosnepoid.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rosnepoid& GET text/xml 180 99999 true 260.42708333 62.00888889 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rosnepoid GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rosnepoid&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0333333333333333 X-ray Optical public rosnepoid ROSAT North Ecliptic Pole Survey Optical Identifications name Object Designation meta.id;meta.main char nullable ra Right Ascension of Optical Identification degree pos.eq.ra;meta.main double nullable dec Declination of Optical Identification degree pos.eq.dec;meta.main double nullable flux Rest Frame Detected 0.5-2keV Unabsorbed Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable log_lx Logarithm of Rest Frame K-Corrected 0.5-2keV Luminosity double nullable redshift Spectroscopically Measured Redshift src.redshift double nullable source_type Optical-Based Identification of X-Ray Source src.class char nullable lii Galactic Longitude of Optical Identification degree pos.galactic.lon double nullable notes_flag Flag Indicates Note Exists in Documentation char nullable class Browse Object Classification src.class short nullable dec_xray Declination of X-Ray Source As Detected by ROSAT char nullable ra_xray Right Ascension of X-Ray Source As Detected by ROSAT char nullable flux_corr Rest Frame Total 0.5-2keV Unabsorbed Flux (erg/s/cm^2) erg/s/cm^2 double nullable comments Additional Notes on Source char nullable nep_scan North Ecliptic Pole Scan Number short nullable bii Galactic Latitude of Optical Identification degree pos.galactic.lat double nullable snr Signal-to-Noise Ratio stat.snr float nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable