1996A&A...309..419N

Query : 1996A&A...309..419N

1996A&A...309..419N - Astronomy and Astrophysics, volume 309419-430 (1996/5-2)

BL Lacertae objects in the ROSAT All-Sky Survey: new objects and comparison of different search techniques.

NASS P., BADE N., KOLLGAARD R.I., LAURENT-MUEHLEISEN S.A., REIMERS D. and VOGES W.

Abstract (from CDS):

We report the discovery of 34 BL Lac objects identified during the correlation of the ROSAT All-Sky Survey (RASS) with the Hamburg Quasar Survey (HQS). We find that most of the newly identified sources have high ratios of X-ray to optical flux, log(fX/fB)>1.3, and use this criterion as an efficient, radio-independent means for selecting candidate BL Lac objects. Combining these new sources with 43 previously known BL Lac objects in the ∼6000deg2 surveyed area, allowed us to construct a new sample complete down to fX(0.1-2.4keV)≃5.5x10–12ergs/cm2/s. Using this sample, we compare the efficiency and selection effects inherent in two different search techniques: The first characterized by the selection of high log(fX/fB)objects and second by selection of objects with particular X-ray/radio/optical colour indices. The logS-logN diagram of the sample is consistent with results found in previous X-ray surveys, although it shows indications of more X-ray faint BL Lacs than previously thought. We expect ∼200 additional BL Lac objects among the remaining high log(fX/fB) BL Lac candidates in the surveyed area.

Abstract Copyright: ∼

Journal keyword(s): BL Lac objects: general - X-rays: galaxies - surveys

Nomenclature: Table 3: [NBK96] JHHMMm+DDMM N=34

Simbad objects: 79

goto View the references in ADS

Number of rows : 79
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 RX J0018.4+2947 BLL 00 18 27.7897831296 +29 47 31.163294904       17.4   ~ 65 2
2 QSO J0019+2021 BLL 00 19 37.85449305 +20 21 45.6446105     20.6 19.70   ~ 90 1
3 QSO B0019+058 BLL 00 22 32.44121084 +06 08 04.2689202   19.2   19.07   ~ 152 1
4 RX J0045.3+2127 BLL 00 45 19.2982391160 +21 27 40.001545080 17.37 17.33 17.01 17.3   ~ 85 1
5 QSO J0049+0237 BLL 00 49 43.23593957 +02 37 03.7785936 19.56 19.23 19.14 19.07   ~ 104 1
6 RX J0058.2+1723 BLL 00 58 16.7805708888 +17 23 13.315476408       18.9   ~ 25 0
7 RX J0111.5+0536 BLL 01 11 30.2007591360 +05 36 27.194363496       17.7   ~ 39 1
8 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 373 2
9 RX J0115.7+2520 BLL 01 15 46.1420552904 +25 19 53.344003368 18.08 17.88 18.52     ~ 85 1
10 QSO B0122+09 BLL 01 24 44.5398641328 +09 18 49.289559588     19.98 18.5   ~ 58 0
11 SDSS J015600.09+150213.3 BLL 01 56 00.0967920600 +15 02 13.382342484     19.8     ~ 8 0
12 2MASS J02002945+2712378 BLL 02 00 29.4588110856 +27 12 37.819306044     19.70 18.4   ~ 12 0
13 RX J0201.1+0034 BLL 02 01 06.1794930072 +00 34 00.135789564   18.99 18.42 18   ~ 113 0
14 SDSS J020226.41+084913.6 BLL 02 02 26.4227476680 +08 49 13.691480520     19.00 19   ~ 53 1
15 RX J0227.2+0201 BLL 02 27 16.5921613152 +02 02 00.007676880       18.9   ~ 65 1
16 RX J0232.8+2017 BLL 02 32 48.6148874688 +20 17 17.486717388     18.00 13.96   ~ 387 1
17 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1614 2
18 RX J0319.8+1845 BLL 03 19 51.8082475320 +18 45 34.562475432           ~ 223 1
19 QSO B0406+121 BLL 04 09 22.00871072 +12 17 39.8476330   20.5   18.27   ~ 112 1
20 RX J0805.4+7534 BLL 08 05 26.6463654144 +75 34 25.040530200       15.2   ~ 69 1
21 RX J0809.8+5218 BLL 08 09 49.1868285744 +52 18 58.249938744   16.11 15.59 14.6   ~ 302 1
22 6C 082850+492334 BLL 08 32 23.21674252 +49 13 21.0382979   20.17 19.63     ~ 173 1
23 US 1889 BLL 08 54 09.8887760136 +44 08 30.280418016   17.40 17.14 17   ~ 70 1
24 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
25 Ton 397 BLL 09 15 52.4015550384 +29 33 24.042671532   16.79 16.39 16.085   ~ 238 1
26 RX J0916.8+5238 BLL 09 16 51.9350409624 +52 38 28.331223072   19.02 18.10 15   ~ 82 1
27 6C 092554+502611 BLL 09 29 15.4401569832 +50 13 35.990913000   17.18 16.80 15.94   ~ 159 2
28 RX J0930.6+4950 BLL 09 30 37.5737660328 +49 50 25.549611036   18.81 18.25 17.3   ~ 128 0
29 RX J0930.9+3933 BLL 09 30 56.8468233912 +39 33 35.602385184   21.59 20.91 19.9   ~ 20 0
30 SBSS 0936+522 WD* 09 39 37.6797936264 +52 01 43.438112400   18.0 18     DQ 27 0
31 RX J0954.1+4914 BLL 09 54 09.8719327752 +49 14 59.557692012   19.33 19.10 19.5   ~ 75 0
32 6C 095456+654857 BLL 09 58 47.2451872176 +65 33 54.819354600     17.0 15.75   ~ 771 1
33 RX J1008.1+4705 BLL 10 08 11.4282574752 +47 05 21.453100692   20.22 19.40 18   ~ 35 0
34 RX J1015.0+4926 BLL 10 15 04.1396533776 +49 26 00.706055496   16.56 16.15 14.58   ~ 400 3
35 RX J1031.3+5053 BLL 10 31 18.5251007784 +50 53 35.817278064   17.25 16.98 16.3   ~ 210 2
36 RX J1037.7+5711 BLL 10 37 44.3078432736 +57 11 55.629345156   17.05 16.54 16.7   ~ 131 1
37 RX J1058.6+5628 BLL 10 58 37.7276569824 +56 28 11.207405028   16.80 16.31 14.58   ~ 232 1
38 Z 334-43 BLL 11 36 26.4090783600 +70 09 27.309071232   15.16 14.49 10.51   ~ 394 1
39 HS 1133+6753 BLL 11 36 30.0868711488 +67 37 04.345988232   18.19 17.45 15.3   ~ 161 1
40 8C 1148+592 BLL 11 51 24.6603608736 +58 59 17.566414656   16.53 16.09 16.3   ~ 92 2
41 Ton 605 HB* 12 16 53.6748432768 +30 04 08.692883544   16.110 15.98     B 223 0
42 RX J1217.8+3007 BLL 12 17 52.0819904040 +30 07 00.634936872   16.07 15.62 13.47   G7 516 1
43 7C 121737.89+344814.00 BLL 12 20 08.2941462528 +34 31 21.743167116   17.71 17.09 17.07   ~ 121 1
44 PG 1218+304 BLL 12 21 21.9426947832 +30 10 37.158534012   16.50 15.85 15.7   ~ 497 1
45 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 924 1
46 RX J1230.2+2518 BLL 12 30 14.0893292232 +25 18 07.136022996   15.6   14.78   ~ 177 1
47 QSO B1229+6430 BLL 12 31 31.3949261640 +64 14 18.280701600   18.36 17.62 14.3   ~ 160 2
48 RX J1237.0+3020 BLL 12 37 05.6098555320 +30 20 04.993401156   20.35 19.93 19.2   ~ 24 0
49 RX J1237.6+6258 BLL 12 37 39.0753390528 +62 58 42.801146328   18.89 18.25 17   ~ 116 0
50 RX J1241.6+3440 BLL 12 41 41.3827131720 +34 40 31.005349824   20.21 19.70 19.4   DC 35 0
51 LB 2449 BLL 12 48 18.7847605224 +58 20 28.717260720   16.10 15.78 15.19   ~ 215 1
52 2E 2941 BLL 13 00 17.5450019256 +63 44 40.131627252   21.25 20.74 19.5   ~ 23 1
53 RX J1326.2+2933 BLL 13 26 14.9932019160 +29 33 30.967995924     18.34     ~ 38 0
54 ACO 1774 ClG 13 40 54.0 +39 58 28           ~ 40 0
55 7C 1338+4015 BLL 13 41 05.1067840920 +39 59 45.418368768   18.93 18.24 14.9   ~ 91 2
56 SDSS J134105.84+265029.2 WD* 13 41 05.8357311216 +26 50 29.099695056   18.30 18.25     DC 11 1
57 GALEX J134305.3+270624 WD* 13 43 05.2832528064 +27 06 23.996503296   19.3 18.94 19.0   DC 17 1
58 RX J1353.4+5601 BLL 13 53 28.0474623240 +56 00 56.986350984   19.31 18.92 16.4   ~ 43 0
59 2MASS J13595378+5911029 BLL 13 59 53.7899427648 +59 11 02.928927372   17.9 18.06 17.7   ~ 33 0
60 RX J1409.3+5939 BLL 14 09 23.4933928320 +59 39 40.624242444   19.60 19.05     ~ 83 1
61 6C 141804+543700 BLL 14 19 46.5974051952 +54 23 14.787857796   16.17 15.65 14.16   ~ 630 1
62 RX J1422.6+5801 BLL 14 22 38.8822521768 +58 01 55.514940024   18.49 18.15 17.7   ~ 86 0
63 RX J1428.5+4240 BLL 14 28 32.6090008440 +42 40 21.048123396   16.95 16.45 14.4   ~ 549 1
64 RX J1436.9+5639 BLL 14 36 57.7190885904 +56 39 24.859811736   18.92 18.51 17.6   ~ 83 0
65 RX J1444.5+6336 BLL 14 44 34.9068259224 +63 36 05.984137260   20.76 19.67 18.6   ~ 63 0
66 RX J1535.0+5320 BLL 15 35 00.7962236712 +53 20 37.302992988   19.18 18.75 18.8   ~ 73 1
67 RX J1631.4+4216 BLL 16 31 24.7071049968 +42 17 02.366014416   19.82 19.29 18.4   ~ 29 0
68 RX J1644.3+4546 BLL 16 44 19.9733510880 +45 46 44.350987764   19.44 18.50 15.2   ~ 70 1
69 [CCH90] 1643.2+4021 WD* 16 44 53.2730615640 +40 16 22.541208132   17.6 18.09 18.6   DA 16 1
70 ICRF J170446.9+713817 BLL 17 04 46.9770712224 +71 38 17.609271828   18.93 18.26 17.5   ~ 39 1
71 ZW I 187 BLL 17 28 18.6242294352 +50 13 10.469553996   16.55 15.97 12.95   ~ 396 1
72 7C 173836.20+473929.00 BLL 17 39 57.12907095 +47 37 58.3614787   18.5 19.5 18.88   ~ 147 2
73 RX J1748.5+7005 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 456 2
74 1RXS J180043.6+782806 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 16.134   ~ 793 1
75 QSO B2047+03 BLL 20 50 06.2404902768 +04 07 48.889251300   19.8   19.00   ~ 103 1
76 PMN J2145+0720 BLL 21 45 52.2999532008 +07 19 27.205685508       16   ~ 120 1
77 QSO B2254+0727 BLL 22 57 17.30311778 +07 43 12.3025633   17.07 16.36     ~ 317 1
78 1RXS J233907.6+053433 BLL 23 39 07.4027350824 +05 34 26.445216756     20.30 19.7   ~ 30 1
79 NVSS J235001+194151 BLL 23 50 01.71932 +19 41 51.5338     20.78 19.9   ~ 33 0

To bookmark this query, right click on this link: simbad:objects in 1996A&A...309..419N and select 'bookmark this link' or equivalent in the popup menu