2001A&A...371..833L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST04:31:00

2001A&A...371..833L - Astronomy and Astrophysics, volume 371, 833-857 (2001/6-1)

The ROSAT Deep Survey VI. X-ray sources and Optical identifications of the Ultra Deep Survey.

LEHMANN I., HASINGER G., SCHMIDT M., GIACCONI R., TRUEMPER J., ZAMORANI G., GUNN J.E., POZZETTI L., SCHNEIDER D.P., STANKE T., SZOKOLY G., THOMPSON D. and WILSON G.

Abstract (from CDS):

The ROSAT Deep Surveys in the direction of the Lockman Hole are the most sensitive X-ray surveys performed with the ROSAT satellite. About 70-80% of the X-ray background has been resolved into discrete sources at a flux limit of ∼10–15erg/cm2/s in the 0.5-2.0keV energy band. A nearly complete optical identification of the ROSAT Deep Survey (RDS) has shown that the great majority of sources are AGNs. We describe in this paper the ROSAT Ultra Deep Survey (UDS), an extension of the RDS in the Lockman Hole. The Ultra Deep Survey reaches a flux level of 1.2x10–15erg/cm2/s in 0.5-2.0keV energy band, a level ∼4.6 times fainter than the RDS. We present nearly complete spectroscopic identifications (90%) of the sample of 94 X-ray sources based on low-resolution Keck spectra. The majority of the sources (57) are broad emission line AGNs (type I), whereas a further 13 AGNs show only narrow emission lines or broad Balmer emission lines with a large Balmer decrement (type II AGNs) indicating significant optical absorption. The second most abundant class of objects (10) are groups and clusters of galaxies (∼11%). Further we found five galactic stars and one ``normal'' emission line galaxy. Eight X-ray sources remain spectroscopically unidentified. We see no evidence for any change in population from the RDS survey to the UDS survey. The photometric redshift determination indicates in three out of the eight sources the presence of an obscured AGN. Their photometric redshifts, assuming that the spectral energy distribution (SED) in the optical/near-infrared is due to stellar processes, are in the range of 1.2≤z≤2.7. These objects could belong to the long-sought population of type 2 QSOs, which are predicted by the AGN synthesis models of the X-ray background. Finally, we discuss the optical and soft X-ray properties of the type I AGN, type II AGN, and groups and clusters of galaxies, and the implication to the X-ray background.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: active - galaxies: clusters: general - quasars: emission lines - galaxies: Seyferts - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/371/833): table3.dat table4.dat>

Nomenclature: Table 3: RDS NNN N=46 added. Table 4: RDS NNNA N=44 added.

Simbad objects: 98

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Number of rows : 98

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [VV98] J105009.4+571443 QSO 10 50 09.2834350447 +57 14 44.238233601   21.08 20.87     ~ 8 0
2 2XMM J105009.5+573145 Sy1 10 50 09.528 +57 31 44.03     20.70     ~ 9 0
3 [VV98] J105016.1+571953 QSO 10 50 15.9638378294 +57 19 54.534302296   21.32 20.85     ~ 9 0
4 [VV98] J105019.8+572812 QSO 10 50 19.7237 +57 28 12.866     18.70     ~ 14 0
5 RDS 56D Sy1 10 50 20.082 +57 14 22.06           ~ 8 0
6 [VV98] J105039.6+572337 QSO 10 50 39.5437224910 +57 23 36.607742705   19.85 19.55     ~ 34 0
7 2XMM J105044.0+572919 Sy2 10 50 44.060 +57 29 19.85           ~ 5 0
8 2XMM J105045.9+571732 SyG 10 50 46.024 +57 17 33.84           ~ 11 0
9 RDS 67B GrG 10 50 54.3 +57 06 52           ~ 3 0
10 RDS 67 SyG 10 50 56.6 +57 07 20           ~ 7 2
11 [VV98] J105104.0+573054 QSO 10 51 03.930 +57 30 54.72     20.30     ~ 13 0
12 RDS 43A AGN 10 51 05.1 +57 19 23           ~ 10 0
13 2XMM J105108.2+573345 AGN 10 51 08.38 +57 33 45.4           ~ 14 0
14 2XMM J105114.4+571615 AGN 10 51 14.414 +57 16 15.74   22.59 21.61     ~ 10 0
15 RDS 51L AGN 10 51 17.0 +57 15 51           ~ 7 0
16 RDS 46A AGN 10 51 20.10 +57 18 48.9           ~ 12 0
17 2XMM J105125.3+573050 Sy1 10 51 25.3239881503 +57 30 50.344551131     19.30     ~ 13 0
18 RDS 61B AGN 10 51 26.3 +57 11 31           ~ 7 0
19 [BCH2008] 444 PM* 10 51 30.9353747450 +57 34 39.635746740   17.11       M5V 14 0
20 RDS 837A Sy1 10 51 37.18 +57 28 57.8           ~ 4 0
21 2XMM J105137.3+573043 AGN 10 51 37.302 +57 30 42.98           ~ 13 0
22 [VV2006] J105144.7+572806 Sy1 10 51 44.91 +57 28 08.0     21.20     ~ 12 0
23 2XMM J105148.6+573248 AGN 10 51 48.732 +57 32 48.71     23.2 22.90   ~ 24 0
24 2XMM J105154.3+573437 Sy1 10 51 54.377 +57 34 37.79     20.00     ~ 19 0
25 [LGE2006] 12 Sy1 10 52 00.11 +57 24 23.5     22.4     ~ 17 0
26 TYC 3826-786-1 PM* 10 52 01.1923002262 +57 10 44.485196567   11.98 10.98     K0V 8 0
27 2MASS J10520626+5715245 AGN 10 52 06.27 +57 15 24.6           ~ 11 0
28 RDS 825 G 10 52 06.51 +57 22 14.0           ~ 2 0
29 2XMM J105207.4+573838 Sy1 10 52 07.379 +57 38 38.05     22.40     ~ 9 0
30 3XMM J105209.6+572104 Sy1 10 52 09.708 +57 21 04.54     21.70     ~ 13 0
31 2XMM J105213.2+573221 Sy1 10 52 13.256 +57 32 21.56   21.50 21.38     ~ 13 0
32 [VV2006] J105215.7+570403 Sy1 10 52 15.619 +57 04 03.98     20.60     ~ 4 0
33 2XMM J105216.8+572017 AGN 10 52 16.95 +57 20 18.0           ~ 12 0
34 RX J105220.1+572307 X 10 52 20.17 +57 23 06.8           ~ 5 0
35 UCAC4 739-049221 * 10 52 22.3874304469 +57 37 35.261009010   18.62 17.09 16.44   ~ 4 0
36 2XMM J105224.5+573009 AGN 10 52 24.615 +57 30 09.41           ~ 16 0
37 RX J105225.3+572246 Sy1 10 52 25.34 +57 22 47.3     21.7     ~ 8 0
38 [VV98] J105225.9+571907 QSO 10 52 25.88 +57 19 06.7   25.90 23.85 24.7 21.77 ~ 17 1
39 RDS 18 Sy1 10 52 28.34 +57 31 04.3           ~ 10 0
40 [VV98] J105230.1+573913 QSO 10 52 30.0779909966 +57 39 13.496769711   21.75 21.00     ~ 17 0
41 RX J105236.4+573748 X 10 52 36.23 +57 37 42.2           ~ 2 0
42 RDS 58B GrG 10 52 38.8 +57 13 00           ~ 5 0
43 [VV98] J105239.6+572432 QSO 10 52 39.5956823532 +57 24 31.423198415   18.39 18.07     ~ 68 0
44 2XMM J105241.5+573650 Sy2 10 52 41.5486780938 +57 36 50.087551368           ~ 12 0
45 2XMM J105242.2+573158 Sy1 10 52 42.38 +57 31 58.3     25.2 25.00   ~ 17 0
46 [VV98] J105243.3+571545 QSO 10 52 43.1558165911 +57 15 44.440042717   20.66 20.46     ~ 19 0
47 RX J105243.4+572800 AGN 10 52 43.51 +57 27 59.5     24.7     ~ 7 0
48 [VV98] J105244.8+572123 QSO 10 52 44.7219048061 +57 21 22.488204142   21.18 20.86     ~ 19 0
49 RDS 47A AGN 10 52 45.0 +57 17 33           ~ 8 0
50 RDS 801A Sy1 10 52 45.39 +57 37 45.9           ~ 10 0
51 RDS 840D GrG 10 52 46.9 +57 40 42           ~ 1 0
52 2XMM J105247.9+572116 Sy1 10 52 48.0460572311 +57 21 16.656471029   20.84 20.34     ~ 20 0
53 [VV98] J105248.5+571206 QSO 10 52 48.329 +57 12 05.66     21.60     ~ 8 0
54 RX J105251.2+572011 X 10 52 51.16 +57 20 13.3           ~ 4 0
55 2MASS J10525274+5728596 Sy2 10 52 52.7622205894 +57 28 59.647496974     17.8     ~ 19 0
56 2XMM J105254.3+572342 Sy1 10 52 54.45 +57 23 42.4     23.1     ~ 12 0
57 [VV98] J105257.3+572507 QSO 10 52 57.1391041997 +57 25 06.854348920   22.09 21.48     ~ 20 0
58 2XMM J105258.2+572251 AGN 10 52 58.174 +57 22 50.91           ~ 7 0
59 RX J105258.4+572356 X 10 52 58.52 +57 23 56.0           ~ 3 0
60 [VV98] J105259.3+573030 QSO 10 52 59.163 +57 30 29.98     21.70     ~ 16 0
61 2XMM J105259.7+573155 Sy1 10 52 59.819 +57 31 54.72     21.50     ~ 10 0
62 2XMM J105302.4+573756 Sy1 10 53 02.412 +57 37 56.83   21.47 21.48     ~ 13 0
63 RDS 827 Sy2 10 53 03.53 +57 35 29.5     22.0     ~ 6 0
64 2XMM J105303.7+572924 Sy1 10 53 03.759 +57 29 24.07           ~ 12 0
65 3XMM J105306.0+573424 Sy1 10 53 06.0540860492 +57 34 24.604415848   20.71 20.46     ~ 19 0
66 [VV98] J105307.4+571505 QSO 10 53 07.3242990463 +57 15 04.633983315     20.30     ~ 19 0
67 2XMM J105309.2+572821 Sy1 10 53 09.2947357240 +57 28 20.536899129   21.15 20.85     ~ 16 0
68 RDS 634 Sy1 10 53 11.80 +57 23 07.0           ~ 8 0
69 2XMM J105312.2+572506 Sy1 10 53 12.239 +57 25 06.20           ~ 11 0
70 RDS 804 AGN 10 53 12.50 +57 34 24.7           ~ 10 0
71 [VV98] J105316.9+573552 QSO 10 53 16.7649284317 +57 35 50.742134562   19.97 19.47     ~ 58 0
72 [VV2010c] J105318.7+572042 AGN 10 53 18.604 +57 20 44.53           ~ 9 1
73 MCXC J1053.3+5720 ClG 10 53 18.97 +57 20 44.7           ~ 19 0
74 2XMM J105318.9+571851 AGN 10 53 19.023 +57 18 51.81     21.3     ~ 16 0
75 2XMM J105322.0+572851 AGN 10 53 22.107 +57 28 51.23     22.70     ~ 10 0
76 LEDA 3095998 Sy1 10 53 24.6641734586 +57 12 31.009564020           ~ 16 0
77 ISO-LHDS J105324+572823 Sy1 10 53 24.67 +57 28 18.9     22.4     ~ 11 0
78 RX J105329.5+573538 GrG 10 53 28.92 +57 35 35.8     22.2     ~ 3 0
79 2XMM J105329.3+572104 AGN 10 53 29.409 +57 21 04.20           ~ 17 0
80 [VV98] J105331.8+572454 QSO 10 53 31.7363515070 +57 24 54.121607821   20.32 20.20     ~ 22 0
81 2XMM J105334.9+572542 AGN 10 53 35.0310913521 +57 25 42.142023508     19.50     ~ 25 0
82 TYC 3829-162-1 * 10 53 36.3453128921 +57 38 00.375000651   11.08 10.50     ~ 8 0
83 2XMM J105339.6+573104 Sy1 10 53 39.7411403467 +57 31 04.400315465   19.97 19.79     ~ 22 0
84 NAME RX J1053.7+5735 W ClG 10 53 39.78 +57 35 20.2           ~ 9 1
85 RX J105340.4+572349 ClG 10 53 40.17 +57 23 52.7           ~ 2 0
86 [VV98] J105345.0+572840 QSO 10 53 44.864 +57 28 40.36   21.27 21.19     ~ 17 0
87 NAME RX J1053.7+5735 E ClG 10 53 46.47 +57 35 10.8           ~ 10 1
88 RDS 805A Sy1 10 53 47.37 +57 33 50.0     22.6     ~ 10 0
89 2XMM J105348.7+573034 AGN 10 53 48.774 +57 30 34.08     23.3     ~ 16 0
90 [VV98] J105350.3+572710 QSO 10 53 50.219 +57 27 09.54   20.68 20.56     ~ 18 0
91 RX J105350.7+572515 GrG 10 53 50.81 +57 25 13.6           ~ 3 0
92 2XMM J105357.0+573241 Sy1 10 53 57.136 +57 32 41.50   21.71 21.31     ~ 10 0
93 2XMM J105358.2+572925 Sy1 10 53 58.273 +57 29 25.74     22.5     ~ 8 0
94 [VV2006] J105406.4+571340 Sy1 10 54 06.226 +57 13 41.48   20.75 20.31     ~ 4 0
95 RDS 20 mul 10 54 10.31 +57 30 38.5           ~ 6 0
96 2MASS J10541032+5730380 * 10 54 10.322 +57 30 38.04           M5V 7 0
97 3XMM J105421.1+572544 Sy1 10 54 21.2026847547 +57 25 44.283242362       18.80   ~ 35 0
98 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 780 1

    Equat.    Gal    SGal    Ecl

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2020.08.09-04:31:00

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