2012MNRAS.420.2518N

Query : 2012MNRAS.420.2518N

2012MNRAS.420.2518N - Mon. Not. R. Astron. Soc., 420, 2518-2525 (2012/March-1)

The environment of weak emission-line quasars.

NIKOLAJUK M. and WALTER R.

Abstract (from CDS):

The nature of weak emission-line quasars (WLQs) is probed by comparing the Baldwin effect (BEff) in WLQs and normal quasars [quasi-stellar objects (QSOs)]. We selected 81 high-redshift ( z > 2.2) and two intermediate-redshift ( z = 1.66 and 1.89) WLQs. Their rest-frame equivalent widths (EWs) of the C IV emission line and their Eddington ratio were obtained from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) quasar catalogue or from Diamond-Stanic et al. We compare the parameters of WLQs with those of 81 normal quasars from Bright Quasar Survey and 155 radio-quiet and radio-intermediate quasars detected by SDSS and Chandra. The influence of the Eddington ratio, L Bol/ L Edd, and the X-ray to optical luminosity ratio, αox, on the BEff is analysed. We find that WLQs follow a different relationship on the EW(C IV)– L Bol/ L Edd plane than normal quasars. This relationship disagrees with the super-Eddington hypothesis. The weakness/absence of emission lines in WLQs does not seem to be caused by their extremely soft ionizing continuum but by low covering factor (Ω/4π) of their broad-line region. Comparison of emission-line intensities indicates that the ratios of high-ionization line and low-ionization line regions (i.e. ΩHIL/ΩLIL) are lower in WLQs than in normal QSOs. The covering factors of the regions producing C IV and Lyα emission lines are similar in both WLQs and QSOs. Recurrent dust formation by WR 48a on a 30-year time-scale

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: active - quasars: emission lines - ultraviolet: galaxies - X-rays: galaxies

Simbad objects: 91

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Number of rows : 91
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 2MASS J00454722+0410233 Sy1 00 45 47.2231233240 +04 10 23.386759392   15.88 16.00     ~ 163 0
2 SDSS J010802.90-010946.1 QSO 01 08 02.9077279080 -01 09 46.100644092   20.34 19.77     ~ 22 0
3 SDSS J025646.56+003858.3 QSO 02 56 46.5670684368 +00 38 58.343320680   20.52 19.82     ~ 21 0
4 USNO-A2.0 0750-00729793 BLL 03 17 12.2364900000 -07 58 50.326981104   18.2 18.93 18.6   ~ 29 0
5 LEDA 88588 Sy1 07 08 41.4886614696 -49 33 06.308921700   16.02 15.7 12.7   ~ 566 0
6 [VV2006] J080523.4+214920 QSO 08 05 23.3226434016 +21 49 21.222191676   21.05 20.21     ~ 30 0
7 SDSS J080906.87+172955.1 QSO 08 09 06.8809106256 +17 29 55.183043328   19.11 18.78     ~ 29 0
8 SDSS J082059.34+561021.9 QSO 08 20 59.3394830520 +56 10 21.988435872   21.60 20.76     ~ 24 0
9 QSO J0826+5152 QSO 08 26 38.5922472096 +51 52 33.220318512   17.78 17.45     ~ 30 0
10 [VV2006] J083122.6+404623 QSO 08 31 22.5760969488 +40 46 23.417454036   24.03 21.99     ~ 37 0
11 [VV2006] J083304.7+415331 QSO 08 33 04.7415606144 +41 53 31.352571384   19.92 19.55     ~ 29 0
12 SDSS J083330.56+233909.2 QSO 08 33 30.5681222616 +23 39 09.228242700   20.02 19.69     ~ 25 0
13 SDSS J084249.03+235204.7 QSO 08 42 49.0260787824 +23 52 04.799745552   20.45 19.95     ~ 20 0
14 QSO B0841+129 BLL 08 44 24.2445546984 +12 45 46.526286780   18.28 18.5     ~ 121 0
15 SDSS J084434.15+224305.2 QSO 08 44 34.1535078336 +22 43 05.219400576   20.56 19.99     ~ 24 0
16 [VV2006] J090703.9+410748 QSO 09 07 03.9236937336 +41 07 48.378735228   19.53 19.35     ~ 23 0
17 [VV2006] J091739.0+082053 QSO 09 17 38.9118298176 +08 20 53.856746880   20.81 20.22     ~ 26 0
18 SDSS J092312.75+174452.8 QSO 09 23 12.7486973784 +17 44 52.838261088   19.27 18.98     ~ 19 0
19 [VV2006] J093306.9+332556 QSO 09 33 06.8822318352 +33 25 56.599606308   23.95 22.16     ~ 25 0
20 [VV2006] J094534.0+100950 QSO 09 45 33.9892793712 +10 09 50.100934932   18.51 18.16     ~ 57 0
21 SDSS J095108.76+314705.8 QSO 09 51 08.7626813784 +31 47 05.884749960   20.92 20.55     ~ 21 0
22 [VV2006] J101204.0+531332 QSO 10 12 04.0468433472 +53 13 31.819654488   19.54 19.22     ~ 31 0
23 SDSS J101849.78+271914.9 QSO 10 18 49.7819052456 +27 19 14.937003300           ~ 14 0
24 SDSS J102609.92+253651.2 QSO 10 26 09.9267850352 +25 36 51.249862997   19.69 19.42     ~ 17 0
25 [VV2006] J102949.8+605732 QSO 10 29 49.8084757464 +60 57 31.816294488   20.92 20.33     ~ 24 0
26 [VV2006] J103240.5+501211 QSO 10 32 40.5393773328 +50 12 10.943388648   20.50 19.68     ~ 30 0
27 SDSS J104650.29+295206.8 QSO 10 46 50.2854222168 +29 52 06.818888712   22.56 21.29     ~ 22 0
28 [VV2006] J105049.2+441144 QSO 10 50 49.2757275312 +44 11 44.761768368   22.68 21.28     ~ 27 0
29 [VV2006] J111642.8+420324 QSO 11 16 42.8157780576 +42 03 24.999446196   19.53 19.20     ~ 26 0
30 [VV2006] J113354.9+022420 QSO 11 33 54.8960494728 +02 24 20.946327588   21.43 20.24     ~ 30 0
31 SDSS J113729.42+375224.2 QSO 11 37 29.4270664848 +37 52 24.229331796   22.43 21.30     ~ 25 0
32 SDSS J113747.64+391941.5 QSO 11 37 47.6437010904 +39 19 41.456900676   19.89 19.43     ~ 26 0
33 3XMM J114153.3+021924 BLL 11 41 53.3433799320 +02 19 24.332806200   19.91 18.97     ~ 44 0
34 SDSS J114412.77+315800.8 QSO 11 44 12.7751260896 +31 58 00.795541692   19.65 19.17     ~ 26 0
35 SDSS J114958.54+375115.0 QSO 11 49 58.5408627648 +37 51 15.048472428   23.47 22.14     ~ 20 0
36 SDSS J115254.96+150707.7 QSO 11 52 54.9665585832 +15 07 07.751544204   19.74 19.22     ~ 26 0
37 SDSS J115308.45+374232.1 QSO 11 53 08.4549208776 +37 42 32.052727872   21.16 20.70     ~ 16 0
38 QSO J1159+1337 QSO 11 59 06.5236146648 +13 37 37.671720348   19.50 18.53     ~ 52 0
39 [VV2006] J115933.5+054141 QSO 11 59 33.5324611656 +05 41 41.667890460   21.08 20.41     ~ 23 0
40 2MASS J11595972+4101530 QSO 11 59 59.7104670864 +41 01 52.909622724   18.29 17.94     ~ 28 0
41 SDSS J120059.68+400913.1 QSO 12 00 59.6892789360 +40 09 13.071725244   20.70 20.19     ~ 30 0
42 NGC 4151 Sy1 12 10 32.5759813872 +39 24 21.063527532   12.18 11.48     ~ 3938 2
43 SDSS J121221.56+534128.0 BLL 12 12 21.5596202040 +53 41 27.903506676   19.36 18.80     ~ 39 0
44 [VV2006] J121812.3+444544 QSO 12 18 12.3972155928 +44 45 44.567462160   23.55 22.14     ~ 25 0
45 [VV2006] J122021.4+092136 QSO 12 20 21.3921862848 +09 21 35.822042244   21.84 20.69     ~ 31 0
46 [VV2006] J122359.3+112800 QSO 12 23 59.3460913728 +11 28 00.103765188   22.08 21.03     ~ 27 0
47 SDSS J122445.26+375921.3 QSO 12 24 45.2710089120 +37 59 21.272391960   22.95 21.53     ~ 25 0
48 SDSS J123116.08+411337.3 QSO 12 31 16.0884043584 +41 13 37.284189276   22.12 21.08     ~ 20 0
49 SDSS J123132.37+013814.1 BLL 12 31 32.3721125040 +01 38 14.058628800   19.61 18.96     ~ 40 0
50 SDSS J123315.94+313218.4 QSO 12 33 15.9435759840 +31 32 18.545806428   20.86 20.44     ~ 23 0
51 [VV2006] J123540.2+123620 QSO 12 35 40.1979019296 +12 36 20.713687560   21.28 20.76     ~ 21 0
52 SDSS J123743.05+630145.1 BLL 12 37 43.0846910328 +63 01 44.856023412   20.70 19.49     ~ 47 0
53 [VV2006] J124204.3+625711 QSO 12 42 04.2715634328 +62 57 12.072394728   20.89 20.28     ~ 28 0
54 SDSS J124745.39+325147.0 QSO 12 47 45.3915796800 +32 51 47.109568788   19.38 19.06     ~ 20 0
55 SDSS J125306.73+130604.9 QSO 12 53 06.7274181312 +13 06 04.953513672   20.77 19.93     ~ 29 0
56 [VV2006] J125319.1+454152 QSO 12 53 19.1073671664 +45 41 52.870903584   21.43 20.74     ~ 20 0
57 [VV2006] J130216.2+003031 QSO 13 02 16.1351008824 +00 30 32.144356404   23.63 22.10     ~ 41 0
58 [VV2006] J131429.1+494148 QSO 13 14 28.9973382720 +49 41 49.058304252   20.89 20.07     ~ 31 0
59 LEDA 88835 Sy1 13 25 19.3805530608 -38 24 52.611680340   16.64 13.80 15.33 14.78 ~ 457 0
60 SDSS J132603.00+295758.1 QSO 13 26 03.0104909688 +29 57 58.215930120   20.06 19.32     ~ 20 0
61 SDSS J132703.26+341321.7 QSO 13 27 03.2654021808 +34 13 21.679696236   19.53 19.23     ~ 25 0
62 [VV2006] J133146.2+483826 QSO 13 31 46.2102256728 +48 38 26.464131744   21.04 20.17     ~ 31 0
63 [VV2006] J133422.6+475033 QSO 13 34 22.6375160520 +47 50 33.494162712   25.50 23.02     ~ 35 0
64 SDSS J134521.39+281822.2 QSO 13 45 21.3999065616 +28 18 22.280119488   23.01 21.68     ~ 22 0
65 [VV2006] J140300.2+432805 QSO 14 03 00.2302615296 +43 28 05.434694040   24.77 22.78     ~ 27 0
66 QSO J1408+0205 QSO 14 08 50.9138577456 +02 05 22.680293784   20.55 19.75     ~ 37 0
67 QSO J1409+2618 QSO 14 09 23.9085820008 +26 18 21.056458176   16.07 15.74     ~ 193 0
68 SDSS J141209.96+062406.8 QSO 14 12 09.9691953864 +06 24 06.868135080   22.56 21.35     ~ 43 1
69 [VV2006] J141318.9+450523 Bla 14 13 18.8641 +45 05 23.012   20.70 19.98 19.27   ~ 50 1
70 SDSS J141657.93+123431.6 QSO 14 16 57.9321599112 +12 34 31.586534220   19.23 18.99     ~ 23 0
71 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
72 QSO J1421+3433 QSO 14 21 03.8342520264 +34 33 31.993246512   25.16 22.81     ~ 36 0
73 [VV2006] J142145.0+351315 QSO 14 21 44.9781862200 +35 13 15.449165472   23.76 21.91     ~ 25 0
74 [VV2006] J142257.7+375807 QSO 14 22 57.6667002384 +37 58 07.368199896   21.07 20.42     ~ 24 0
75 SDSS J144127.65+475048.7 QSO 14 41 27.6644473008 +47 50 48.714325044   20.41 19.70     ~ 24 0
76 [VV2006] J144231.7+011055 QSO 14 42 31.7221836498 +01 10 55.413109732   23.45 22.04     ~ 38 0
77 SDSS J144803.36+240704.2 QSO 14 48 03.3694205616 +24 07 04.241741700   20.49 19.86     ~ 18 0
78 QSO J1532-0039 QSO 15 32 59.9585073048 -00 39 43.819557948   23.88 22.26     ~ 33 0
79 [VV2006] J155645.3+380753 QSO 15 56 45.3058858800 +38 07 52.753852164   20.80 20.24     ~ 23 0
80 [VV2006] J160336.7+350824 QSO 16 03 36.6525052248 +35 08 24.326120400   21.63 20.61     ~ 31 0
81 [VV2006] J161122.4+414410 QSO 16 11 22.4552369640 +41 44 09.490775964   19.95 19.37     ~ 30 0
82 [VV2006] J163411.8+215324 QSO 16 34 11.8205563896 +21 53 25.076926032   22.71 21.43     ~ 34 0
83 FIRST J170108.8+395443 BLL 17 01 08.8931185536 +39 54 43.058701908   19.55 19.25 18.9   ~ 40 0
84 [VV2006] J210216.5+104906 QSO 21 02 16.5220695312 +10 49 06.604566240   21.77 20.58     ~ 26 0
85 SDSS J214753.29-073031.3 QSO 21 47 53.2895215680 -07 30 31.341574224   20.06 19.70     ~ 21 0
86 PHL 1811 Sy1 21 55 01.5124437432 -09 22 24.349496808   13.9 16.8 14.1   ~ 200 1
87 [VV2006] J223827.2+135432 QSO 22 38 27.1775262792 +13 54 32.664294864   21.08 20.30     ~ 25 0
88 SDSS J225246.43+142525.8 QSO 22 52 46.4418440712 +14 25 25.860136512   25.41 23.01     ~ 30 0
89 [VV2006] J233255.7+141916 QSO 23 32 55.7242815888 +14 19 16.399988544   23.87 22.43     ~ 25 0
90 QSO B2332-094 QSO 23 34 46.4045250120 -09 08 12.250650732   19.21 18.62 18.07   ~ 89 1
91 [VV2006] J233939.5-103539 QSO 23 39 39.4840577040 -10 35 39.350545260   19.28 19.00     ~ 21 0

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