1998A&A...329..482H

Query : 1998A&A...329..482H

1998A&A...329..482H - Astronomy and Astrophysics, volume 329482-494 (1998/1-2)

The ROSAT Deep Survey. I. X-ray sources in the Lockman Field.

HASINGER G., BURG R., GIACCONI R., SCHMIDT M., TRUEMPER J. and ZAMORANI G.

Abstract (from CDS):

The ROSAT Deep Survey in the Lockman Hole is the most sensitive X-ray survey performed to date, encompassing an exposure time of 207ksec with the PSPC and a total of 1.32Msec with the HRI aboard ROSAT. Here we present the complete catalogue of 50 X-ray sources with PSPC fluxes (0.5-2keV) above 5.5x10–15erg/cm2/s. The optical identifications are discussed in an accompanying paper (Schmidt et al., 1997). We also derive a new log(N)-log(S) function reaching a source density of 970±150deg–2 at a limiting flux of 10–15erg/cm2/s. At this level 70-80% of the 0.5-2keV X-ray background is resolved into discrete sources. Utilizing extensive simulations of artificial PSPC and HRI fields we discuss in detail the effects of source confusion and incompleteness both on source counts and on optical identifications. Based on these simulations we set conservative limits on flux and on off-axis angles, which guarantee a high reliability of the catalogue. We also present simulations of shallower fields and show that surveys, which are based on PSPC exposures longer than 50ksec, become severely confusion limited typically a factor of 2 above their 4σ detection threshold. This has consequences for recent claims of a possible new source population emerging at the faintest X-ray fluxes.

Abstract Copyright: ∼

Journal keyword(s): surveys - cosmology: diffuse radiations - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/329/482): table4.dat>

Nomenclature: Table 4: RDS NNN N=50 among about 960

Simbad objects: 50

goto View the references in ADS

Number of rows : 50
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 [VV98] J105009.4+571443 QSO 10 50 09.2843216280 +57 14 44.261564496   21.08 20.87     ~ 11 0
2 2XMM J105009.5+573145 Sy1 10 50 09.5330050656 +57 31 43.960092204     20.70     ~ 9 0
3 [VV98] J105016.1+571953 QSO 10 50 15.9565843584 +57 19 54.414164388   21.32 20.85     ~ 13 0
4 [VV98] J105019.8+572812 QSO 10 50 19.7237 +57 28 12.866     18.70     ~ 16 0
5 RDS 56D Sy1 10 50 20.082 +57 14 22.06           ~ 10 0
6 [VV98] J105039.6+572337 QSO 10 50 39.5438741904 +57 23 36.609192456   19.85 19.55 19.14   ~ 47 1
7 RX J1050.7+5717 SyG 10 50 46.02216 +57 17 33.8352           ~ 11 0
8 RX J1050.9+5706 SyG 10 50 56.11224 +57 06 48.2004           ~ 7 1
9 [VV98] J105104.0+573054 QSO 10 51 03.930 +57 30 54.72     20.30     ~ 13 0
10 RDS 43A AGN 10 51 05.1 +57 19 23           ~ 10 0
11 ISO-LHDS J105108+573343 rG 10 51 08.38 +57 33 45.4           ~ 14 0
12 2XMM J105114.4+571615 AGN 10 51 14.414 +57 16 15.74   22.59 21.61     ~ 10 0
13 RDS 51L AGN 10 51 17.0 +57 15 51           ~ 7 0
14 RDS 46A AGN 10 51 20.10 +57 18 48.9           ~ 12 0
15 SDSS J105126.18+571131.1 AGN 10 51 26.18809 +57 11 31.1785           ~ 8 0
16 [BCH2008] 444 PM* 10 51 30.9358892064 +57 34 39.630370584   17.11       M5Ve? 16 0
17 2XMM J105137.3+573043 AGN 10 51 37.302 +57 30 42.98           ~ 13 0
18 SDSS J105148.73+573248.7 rG 10 51 48.732 +57 32 48.71     23.2 22.90   ~ 28 0
19 2XMM J105154.3+573437 Sy1 10 51 54.377 +57 34 37.79     20.00     ~ 19 0
20 TYC 3826-786-1 Em* 10 52 01.1920926120 +57 10 44.482721340   11.98 10.98     K0 12 0
21 2MASS J10520626+5715245 AGN 10 52 06.2807459376 +57 15 23.712201684           ~ 11 0
22 RDS 84 rG 10 52 16.95 +57 20 18.0           ~ 13 0
23 2XMM J105224.5+573009 AGN 10 52 24.615 +57 30 09.41           ~ 16 0
24 2XMM J105225.0+572304 AGN 10 52 25.046 +57 23 05.19           ~ 13 0
25 [VV98] J105230.1+573913 QSO 10 52 30.0812803008 +57 39 13.483856772   21.75 21.00     ~ 17 0
26 RDS 116 rG 10 52 37.0 +57 30 58     21.8     ~ 11 0
27 RDS 58B GrG 10 52 38.8 +57 13 00           ~ 5 0
28 [VV98] J105239.6+572432 QSO 10 52 39.5958253296 +57 24 31.425574788   18.39 18.07     ~ 76 0
29 2XMM J105242.2+573158 Sy1 10 52 42.38 +57 31 58.3     25.2 25.00   ~ 18 0
30 [VV98] J105243.3+571545 QSO 10 52 43.1559083808 +57 15 44.442070236   20.66 20.46     ~ 24 0
31 [VV98] J105244.8+572123 QSO 10 52 44.7211227504 +57 21 22.457174220   21.18 20.86     ~ 26 0
32 RDS 47A AGN 10 52 45.0 +57 17 33           ~ 8 0
33 2XMM J105247.9+572116 Sy1 10 52 48.0450883248 +57 21 16.654430304   20.84 20.34     ~ 27 0
34 [VV98] J105248.5+571206 QSO 10 52 48.329 +57 12 05.66     21.60     ~ 8 0
35 [VV98] J105257.3+572507 QSO 10 52 57.1388606136 +57 25 06.850948620   22.09 21.48     ~ 24 0
36 [VV98] J105259.3+573030 QSO 10 52 59.163 +57 30 29.98     21.70     ~ 16 0
37 [VV98] J105307.4+571505 QSO 10 53 07.3241878632 +57 15 04.632919200     20.30     ~ 24 0
38 [VV98] J105316.9+573552 QSO 10 53 16.7644541304 +57 35 50.730680004   19.97 19.47     ~ 69 0
39 SDSS J105318.60+572044.5 SyG 10 53 18.6122820576 +57 20 44.589006888           ~ 10 1
40 SDSS J105319.02+571851.8 rG 10 53 19.023 +57 18 51.81     21.3 20.84   ~ 19 0
41 LEDA 3095998 Sy1 10 53 24.6642123384 +57 12 31.015505340           ~ 18 0
42 2XMM J105329.3+572104 AGN 10 53 29.409 +57 21 04.20           ~ 17 0
43 [VV98] J105331.8+572454 QSO 10 53 31.7346910536 +57 24 54.112156956   20.32 20.20     ~ 23 0
44 2XMM J105334.9+572542 AGN 10 53 35.0308257600 +57 25 42.141068976     19.50     ~ 25 0
45 2XMM J105339.6+573104 Sy1 10 53 39.7417789968 +57 31 04.402572060   19.97 19.79     ~ 23 0
46 [VV98] J105345.0+572840 QSO 10 53 44.864 +57 28 40.36   21.27 21.19     ~ 23 0
47 SDSS J105348.77+573034.0 rG 10 53 48.774 +57 30 34.08     23.3     ~ 18 0
48 [VV98] J105350.3+572710 QSO 10 53 50.2208736432 +57 27 09.506758536   20.68 20.56     ~ 25 0
49 RDS 20 mul 10 54 10.3 +57 30 39           ~ 4 0
50 2MASS J10542112+5725431 Sy1 10 54 21.1984001400 +57 25 44.284004364       18.80   ~ 47 1

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