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The NEP ROSAT Survey

Published online by Cambridge University Press:  25 May 2016

C.R. Mullis ,
I.M. Gioia  and
J.P. Henry
C.R. Mullis
Affiliation:
Institute for Astronomy, University of Hawaii 2680 Woodlawn Drive, Honolulu, HI 96822, USA
I.M. Gioia
Affiliation:
1 Istituto di Radioastronomia del CNR Via Gobetti 101, 40129, Bologna, ITALY
J.P. Henry
Affiliation:
Institute for Astronomy, University of Hawaii 2680 Woodlawn Drive, Honolulu, HI 96822, USA

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The Rosat All-Sky Survey (Trümper 1991, Adv. Spce Res., 2, 241) has its largest exposure times, approaching 10 ks, at the ecliptic poles where the scan circles overlap. The North Ecliptic Pole (NEP) region covers a 9° X 9° field, and contains a total of 465 X-ray sources detected at > 4σ in the 0.1-2.4 keV. We are identifying all sources in the field. The principal derivative is a statistically complete sample of galaxy clusters appropriate for more fully characterizing X-ray Luminosity Function (XLF) evolution. We report preliminary results for two subregions which are identified to the 95% level. These subregions are observed to approximately the median NEP survey exposure. They enclose 16% of the survey area and contain 96 X-ray sources representing 21% of the total NEP. The typical mix of sources is consistent with the Einstein Extended Medium Sensisitivity Survey (EMSS; Gioia et al., 1990a, ApJS, 72, 567). In particular there are 56% AGN/ELG (59% in the EMSS), 25% stars (27% in the EMSS) and 14% clusters against 13% clusters in the EMSS.

Type
Session 4: Large Scale Hot Plasmas and Their Relation with Dark Matter
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 473 - 474
Copyright
Copyright © Kluwer 1998