2005A&A...434..895N

Query : 2005A&A...434..895N

2005A&A...434..895N - Astronomy and Astrophysics, volume 434, 895-907 (2005/5-2)

Optical follow-up of BL Lac candidates in the 2BL sample.

NESCI R., SCLAVI S. and MASSARO E.

Abstract (from CDS):

We investigate the nature of the BL Lac candidates in the northern part of the 2BL sample (Londish et al., 2002MNRAS.334..941L) searching for optical variability by means of RC band photometry with the Asiago 1.8 and Loiano 1.5m telescopes during years 2002, 2003 and 2004. We also made aperture photometry of the candidates on the plates available on the web from the Palomar and UK Schmidt telescopes. No significant variability was detected for the majority of the objects without detected radio and/or X-ray emissions, while clear variability was found for the few sources of the sample with strong radio and/or X-ray emission, which is a constant feature of the ``classical'' BL Lacs. Some considerations on the nature of the 2BL sources are made, taking into account their most recent data available in proper motions catalogues (SuperCOSMOS, USNO-B1) and in the Sloan Digital Sky Survey.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: BL Lacertae objects: general

Simbad objects: 70

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Number of rows : 70
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2329 1
2 2QZ J100253.2-001728 WD* 10 02 53.2365799320 -00 17 27.031334604   18.9   19.1   DC 14 1
3 GSC2 S12121203157 * 10 03 07.2360555096 -00 20 52.742244048   17.2 16.6     ~ 1 0
4 GSC2 S12120004610 * 10 25 54.6253291344 -00 04 05.387616516   17.3 16.5     ~ 2 0
5 MGC 6980 WD* 10 26 15.3089752872 -00 06 30.270531924   19.40       DC 13 1
6 GSC2 N20310011951 * 10 36 03.1889493816 +01 57 50.102519364   17.7 17.2     ~ 1 0
7 SDSS J103607.52+015659.0 BLL 10 36 07.5230207352 +01 56 59.018161524   19.22 18.99     ~ 31 0
8 2QZ J104519.7+002615 WD* 10 45 19.7273887368 +00 26 14.455769460           DC 17 1
9 GSC2 N20020123674 * 10 45 27.0688012152 +00 26 38.587853292   18.0 17.3     ~ 1 0
10 SDSS J105355.17-005537.7 WD? 10 53 55.1689745400 -00 55 37.736052672   19.53       ~ 10 1
11 GSC2 S12013102499 * 10 53 59.1208839312 -00 57 08.058276216   16.4 16.1     ~ 1 0
12 4FGL J1055.5-0125 BLL 10 55 34.3694040000 -01 26 16.303689636   18.86 18.54 18.8   ~ 33 0
13 GSC2 S12013134345 * 10 55 45.9683882688 -01 26 39.039757548   17.3 16.6     ~ 1 0
14 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2671 1
15 [VV2003b] J110644.5+000717 * 11 06 44.51 +00 07 18.0   19.86       ~ 7 1
16 GSC2 N2002102736 * 11 06 44.7781713576 +00 04 23.347685172   16.9 16.2     ~ 2 0
17 [VV2006] J113413.5+001042 QSO 11 34 13.4790675312 +00 10 42.053204928   19.35 19.01     ~ 33 0
18 GSC2 N2000210760 * 11 34 24.9077985936 +00 09 22.895757792   17.7 17.0     ~ 2 0
19 GSC2 S12003215130 * 11 38 55.4935917720 -02 03 48.462628212   17.3 16.8     ~ 1 0
20 2QZ J113900.5-020140 BLL 11 39 00.5638305720 -02 01 39.967082004   19.86 19.40     ~ 12 0
21 2QZ J114010.5-002936 WD* 11 40 10.5425571072 -00 29 35.476450728   19.90       DB4 17 1
22 GSC2 S12000102281 * 11 40 18.7507625904 -00 30 27.883061388   17.1 16.9     ~ 2 0
23 2QZ J114137.1-002730 QSO 11 41 37.1347694184 -00 27 29.813061096   18.6 18.69 18.8   ~ 31 1
24 GSC2 S12000102432 * 11 41 38.2508271720 -00 28 24.008375676   18.5 17.5     ~ 1 0
25 2QZ J114221.4-014812 * 11 42 21.4577487744 -01 48 11.302112124   19.30       ~ 6 1
26 2QZ J114327.3-005050 BLL 11 43 27.3222321336 -00 50 49.741856052     19.97     ~ 8 0
27 2MASS J11451924-0248245 * 11 45 19.25 -02 48 24.5   16.9 16.4     ~ 1 0
28 LBQS 1142-0231 WD* 11 45 21.6442799304 -02 47 57.513003252     18.79     DC 13 1
29 MGC 24225 * 11 45 50.4422869944 +00 14 28.904189964   16.9 16.4     ~ 2 0
30 MGC 24296 WD? 11 45 54.8755346928 +00 10 24.082302720   19.59       ~ 10 1
31 2QZ J115909.6-024534 BLL 11 59 09.6205019592 -02 45 34.648884360   19.36 19.08     ~ 23 0
32 GSC2 S1200031962 * 11 59 21.1572666720 -02 43 03.946553184   16.1 15.6     ~ 1 0
33 [VV2006] J120015.4+000553 BLL 12 00 15.3528763896 +00 05 53.180879028   20.26 19.75     ~ 28 0
34 GSC2 N12000001088 * 12 00 22.1289080208 +00 06 25.837478820   17.7 17.0     ~ 2 0
35 GSC2 S20000021747 * 12 05 55.4440663752 -00 40 07.523236956   17.6 16.9     ~ 1 0
36 2QZ J120558.1-004216 WD* 12 05 58.2528201768 -00 42 17.117305740   19.11       DC 14 1
37 GSC2 S20000021893 * 12 08 00.0641331744 -00 38 42.076637088   16.6 15.8     ~ 1 0
38 2QZ J120801.8-004219 WD* 12 08 01.8458912544 -00 42 18.471443472   18.96       DC 13 1
39 Ton 605 HB* 12 16 53.6748432768 +30 04 08.692883544   16.110 15.98     B 223 0
40 6C 121520+302351 BLL 12 17 52.0819904040 +30 07 00.634936872   16.07 15.62 13.47   ~ 478 1
41 QSO B1216-010 BLL 12 18 34.9299611304 -01 19 54.342898428 18.43 18.30 18.01 18.2   ~ 109 0
42 GSC2 S20003101017 * 12 18 36.4952530512 -01 16 31.905202836   18.1 17.3     ~ 1 0
43 7C 1219+2830 BLL 12 21 31.6904439888 +28 13 58.500308172   16.81 16.11 14.24   ~ 873 1
44 2QZ J122338.0-015619 WD* 12 23 38.0531768736 -01 56 17.201741532   19.8   19.4   DB? 10 0
45 GSC2 S20002112306 * 12 23 42.5212810344 -01 53 01.779670752   17.3 16.6     ~ 1 0
46 2QZ J123437.6-012953 BLL 12 34 37.6412618304 -01 29 51.960498684   19.44       ~ 16 0
47 GSC2 S20002021494 * 12 34 40.3339674696 -01 29 28.599618696   16.3 15.8     ~ 1 0
48 2MASS J12543412-0115543 * 12 54 34.1164897272 -01 15 54.429940656   16.5 15.9     ~ 1 0
49 2QZ J125435.7-011822 WD* 12 54 35.8142614104 -01 18 22.004078328   19.44       DC 12 1
50 2QZ J130009.8-022601 WD* 13 00 09.9317086656 -02 25 59.304945072   18.9 19.22 19.6   DC 15 1
51 GSC2 S20023213907 * 13 00 19.3388909040 -02 24 31.423737816   18.4 17.4     ~ 1 0
52 SDSS J131635.10-002810.6 WD? 13 16 35.1053787096 -00 28 10.660792584     19.82     ~ 8 1
53 GSC2 S20020122684 * 13 16 41.4646568016 -00 27 21.343812156   17.2 16.7     ~ 1 0
54 2QZ J132811.5+000227 WD? 13 28 11.4781448160 +00 02 26.659333140   19.79       ~ 12 1
55 GSC2 N1201000669 * 13 28 22.0374966096 +00 03 58.823275860   18.2 17.3     ~ 2 0
56 2MASX J14001592+0023420 * 14 00 15.8818085640 +00 23 41.765098020   17.0 16.5     ~ 1 0
57 2QZ J140021.0+001955 * 14 00 21.0909812376 +00 19 56.596121472   19.89       ~ 7 1
58 GSC2 S2021232715 PM* 14 02 06.7283660904 -01 26 44.360308644   17.6 17.0     ~ 1 0
59 2QZ J140207.7-013033 WD* 14 02 07.7442300888 -01 30 32.720931792   19.71       DA 12 1
60 GSC2 S20212017779 * 14 09 07.1414947800 -00 00 37.689023052   17.8 16.9     ~ 2 0
61 2QZ J140916.3-000012 WD* 14 09 16.3354322136 -00 00 11.322244188   19.10 18.84 18.51 18.29 DC 25 1
62 2QZ J141040.2-023020 WD* 14 10 40.1610479136 -02 30 19.935214956   19.43       DC 12 1
63 GSC2 S20232014778 * 14 10 42.4350910632 -02 27 13.113510192   17.4 16.8     ~ 1 0
64 GSC2 S20201311703 * 14 25 20.5775393640 -01 18 56.576320668   16.9 16.5     ~ 1 0
65 4FGL J1425.4-0119 BLL 14 25 26.1813049296 -01 18 25.788969720   19.73 19.23 19.8   ~ 24 0
66 QSO B1514-24 BLL 15 17 41.8134049824 -24 22 19.482207024   15.13 14.00 13.95   ~ 769 3
67 7C 165211.80+395026.00 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2160 2
68 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 625 2
69 2QZ J215454.3-305654 BLL 21 54 54.3298901352 -30 56 53.386005120   19.55       ~ 18 0
70 QSO B2344+514 BLL 23 47 04.8372110928 +51 42 17.877513168     15.50 10.7   ~ 461 0

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