SIMBAD references

2003ApJS..149...29G - Astrophys. J., Suppl. Ser., 149, 29-51 (2003/November-0)

The ROSAT north ecliptic pole survey: the optical identifications.


Abstract (from CDS):

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 ergs/cm2/s in the 0.5-2.0 keV energy band. The NEP survey is centered at α2000=18h00m, δ2000=+66°33' and covers a region of 80.7 deg2 at a moderate Galactic latitude of b=29°.8. 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.

Abstract Copyright:

Journal keyword(s): Galaxies: BL Lacertae Objects: General - Catalogs - Galaxies: Clusters: General - Surveys - X-Rays: General - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJS/149/29): table3.dat notes.dat>

Nomenclature: Table 3, col(2): [GHM2003] NNNN N=446 among (Nos 1239-6570). Paragr. 6: [GHM2003] JHHMMSS.s+DDMMSS N=17, [GHM2003] JHHMMSS.s+DDMMSS = [GHM2003] RX JHHMM.m+DDMM A N=8, [GHM2003] RX JHHMM.m+DDMM AN N=3, [GHM2003] RX JHHMM.m+DDMM cfh N N=2.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 475

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