2014ApJ...794...75S

Query : 2014ApJ...794...75S

2014ApJ...794...75S - Astrophys. J., 794, 75 (2014/October-2)

HST-COS observations of AGNs. II. Extended survey of ultraviolet composite spectra from 159 active galactic nuclei.

STEVANS M.L., SHULL J.M., DANFORTH C.W. and TILTON E.M.

Abstract (from CDS):

The ionizing fluxes from quasars and other active galactic nuclei (AGNs) are critical for interpreting their emission-line spectra and for photoionizing and heating the intergalactic medium. Using far-ultraviolet (FUV) spectra from the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST), we directly measure the rest-frame ionizing continua and emission lines for 159 AGNs at redshifts 0.001 < zAGN< 1.476 and construct a composite spectrum from 475 to 1875 Å. We identify the underlying AGN continuum and strong extreme ultraviolet (EUV) emission lines from ions of oxygen, neon, and nitrogen after masking out absorption lines from the H I Lyα forest, 7 Lyman-limit systems (NHI ≥ 1017.2/cm2) and 214 partial Lyman-limit systems (14.5 < logNHI < 17.2). The 159 AGNs exhibit a wide range of FUV/EUV spectral shapes, Fv ∝ ναν^, typically with -2 ≤ αν ≤ 0 and no discernible continuum edges at 912 Å (H I) or 504 Å (He I). The composite rest-frame continuum shows a gradual break at λbr~ 1000 Å, with mean spectral index αν= -0.83±0.09 in the FUV (1200-2000 Å) steepening to αν= -1.41±0.15 in the EUV (500-1000 Å). We discuss the implications of the UV flux turnovers and lack of continuum edges for the structure of accretion disks, AGN mass inflow rates, and luminosities relative to Eddington values.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - line: profiles - quasars: emission lines - ultraviolet: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/794/75): table1.dat table2.dat>

Simbad objects: 162

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Number of rows : 162
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 ICRF J000559.2+160949 Sy1 00 05 59.2378545384 +16 09 49.021968096   16.51 16.40     ~ 307 1
2 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1344 0
3 2MASX J00122399-1022269 Sy1 00 12 24.0235889448 -10 22 26.551199748   17.59 17.25     ~ 61 0
4 LEDA 3095439 Sy1 00 36 23.0055058008 +43 16 40.155340080   17.2       ~ 20 0
5 PB 8488 QSO 00 42 22.2911404848 -10 37 43.821166980   16.83 16.61     ~ 44 0
6 2MASS J00481898+3941116 Sy1 00 48 18.9838647792 +39 41 11.718147912   16.2       ~ 60 1
7 2MASS J01013117+4229356 Sy1 01 01 31.1691112200 +42 29 35.590782768   16.7       ~ 33 1
8 LBQS 0107-0235 QSO 01 10 13.1603515272 -02 19 52.838715144   18.39 17.80 17.61   ~ 98 2
9 QSO J0110-0218 QSO 01 10 16.2699100608 -02 18 50.762600100   17.4 17.3     ~ 70 1
10 2MASS J01193569-2821314 Sy1 01 19 35.6924750256 -28 21 31.423369428   18.13 16.3 16.58   ~ 55 0
11 Ton S 210 Sy1 01 21 51.5142110136 -28 20 57.799968396   15.38 15.19     ~ 106 0
12 QSO B0120-28 QSO 01 22 36.7681962480 -28 43 21.539661996   16.5 15.71     ~ 30 0
13 QSO J0155-4506 QSO 01 55 13.2179169408 -45 06 11.577944484   15.1       ~ 54 0
14 2MASS J01553002-0857040 Sy1 01 55 30.0252391488 -08 57 04.130375616   17.26 17.02 16.89   ~ 74 0
15 ICRF J020157.1-113233 Sy1 02 01 57.1794759192 -11 32 33.435766068   16.54 16.40 16.073   ~ 223 1
16 ICRF J020213.6-762003 Sy1 02 02 13.6936269168 -76 20 03.062287464   16.95 16.90     ~ 111 1
17 QSO J0209-0438 Bla 02 09 30.7666247448 -04 38 26.145998340   17.5       ~ 72 1
18 6dFGS gJ021218.3-073720 Sy1 02 12 18.3261505008 -07 37 19.814910204   17.97 17.73 17.38   ~ 44 0
19 QSO J0226+0015 QSO 02 26 14.4684457872 +00 15 29.785932612   17.28 17.10     ~ 43 0
20 HE 0226-4110 Sy1 02 28 15.2391681216 -40 57 14.762648232   17.68 15.2 16.22   ~ 144 1
21 MCG-02-07-024 Sy1 02 30 05.5225590096 -08 59 53.207139372   14.74 14.29 13.981 13.585 ~ 332 0
22 4C -04.06 QSO 02 35 07.3418452008 -04 02 05.317096956   16.61 16.46 16.2   ~ 222 1
23 QSO B0238-1904 QSO 02 40 32.5841506272 -18 51 51.370183440     15.00     ~ 76 0
24 QSO J0242-0759 QSO 02 42 50.8576520808 -07 59 14.224504704   17.36 17.19     ~ 43 1
25 LEDA 10293 Sy1 02 43 09.6127088160 -72 16 48.433404756 15.43 16.34 15.86 16.14   ~ 25 0
26 LB 2845 QSO 02 59 37.4641575192 +00 37 36.367307832   16.79 16.72     ~ 80 0
27 ESO 31-8 Sy1 03 07 35.3439205584 -72 50 02.596782336   15.11 14.98 14.58   ~ 71 0
28 LEDA 138607 Sy1 03 10 27.8271759768 -00 49 50.801124072   16.59 16.33 15.3   ~ 67 0
29 QSO J0401-0540 QSO 04 01 48.9808410168 -05 40 56.560994652   16.7 17.01 16.6   ~ 46 0
30 PKS 0405-123 Bla 04 07 48.4309841856 -12 11 36.659928408   15.09 14.86 14.7   ~ 531 1
31 LB 1727 Sy1 04 26 00.7188165240 -57 12 01.769902992 13.68 14.58 14.37 14.8   ~ 307 0
32 QSO J0436-5258 QSO 04 36 50.8453040688 -52 58 48.014254884     16.40     ~ 35 0
33 LEDA 3095694 Sy1 04 38 29.1934776600 -61 47 58.973670096   17.82 16.56 16.63   ~ 31 0
34 QSO J0439-5311 Sy1 04 39 38.7161600856 -53 11 31.242561864     16.2     ~ 59 0
35 QSO J0440-5248 QSO 04 40 12.0482632416 -52 48 17.514120888     16.10     ~ 42 0
36 6dFGS gJ050304.0-663346 Sy1 05 03 03.968 -66 33 45.60   13.9   14.5   ~ 43 0
37 2MASS J05522451-6402108 Sy1 05 52 24.5023213488 -64 02 10.757771160     15.04     ~ 55 1
38 QSO B0558-5026 BLL 05 59 47.3916612936 -50 26 52.025952120   15.18 14.97     ~ 307 1
39 QSO J0623-6436 BLL 06 23 07.6964410104 -64 36 20.722511484   17.06 14.80 13.59   ~ 104 1
40 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 625 1
41 QSO B0748+295 QSO 07 51 12.3036555000 +29 19 38.279865864   16.28 16.18     ~ 62 0
42 2MASSI J0803592+433258 Sy1 08 03 59.2337553168 +43 32 58.353489240   17.78 17.72     ~ 43 1
43 QSO J0809+4619 QSO 08 09 08.1365285760 +46 19 25.574163852   16.83 16.72     ~ 60 0
44 2MASS J08105865+7602424 Sy1 08 10 58.6641543864 +76 02 42.450451260   15.03 14.71     ~ 508 0
45 QSO J0820+2334 QSO 08 20 24.2210785368 +23 34 50.452002372   17.87 17.74     ~ 37 0
46 IRAS F08238+0752 QSO 08 26 33.5091753360 +07 42 48.410916120   17.31 16.99     ~ 42 0
47 QSO B0832+2510 QSO 08 35 35.8061692320 +24 59 40.183955880   16.30 16.00     ~ 77 0
48 QSO J0843+4117 QSO 08 43 49.4978985312 +41 17 41.595899208   17.66 17.41     ~ 48 1
49 MCG+13-07-002 Sy1 08 44 45.2999013720 +76 53 09.465739008     15.7     ~ 201 0
50 QSO J0910+1014 QSO 09 10 29.7517960152 +10 14 13.586561628   18.17 18.08     ~ 50 0
51 QSO J0912+2957 QSO 09 12 35.4243451608 +29 57 25.464100032   18.21 17.97     ~ 26 0
52 QSO J0914+2823 QSO 09 14 40.3889730816 +28 23 30.631322940   17.5 18.10 17.6   ~ 43 0
53 Mrk 106 Sy2 09 19 55.3494938448 +55 21 37.128065832   16.34 16.15     ~ 133 0
54 QSO J0925+4535 QSO 09 25 54.4407540912 +45 35 44.423345796   17.97 17.75     ~ 49 0
55 QSO J0925+4004 QSO 09 25 54.7065961368 +40 04 14.167857972   17.98 17.92     ~ 63 0
56 SBSG 0924+606B Bla 09 28 37.9886806104 +60 25 21.018272772   17.53 17.20     ~ 88 1
57 US 645 Sy1 09 29 09.7919402808 +46 44 24.056076588   16.66 16.49     ~ 54 0
58 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
59 4C 02.27 QSO 09 35 18.1942545696 +02 04 15.563959968   17.31 17.16     ~ 123 1
60 QSO J0943+0531 QSO 09 43 31.6146408840 +05 31 31.475664912   17.50 17.30     ~ 57 0
61 LEDA 3095898 Sy1 09 47 33.2202538560 +10 05 08.796540804   17.30 17.09     ~ 48 0
62 QSO B0946+3916 QSO 09 49 52.9152610440 +39 02 03.941582928   16.92 16.83     ~ 49 0
63 QSO B0946+487 QSO 09 50 00.7413113688 +48 31 29.333280720   17.56 17.47     ~ 73 0
64 PG 0953+414 Sy1 09 56 52.3931554992 +41 15 22.211247636 14.710 15.611 15.546 15.294 14.720 ~ 472 0
65 2MASS J09591566+0503552 Sy1 09 59 15.6573060624 +05 03 55.117641924   17.58 17.32     ~ 45 0
66 QSO J1001+5944 QSO 10 01 02.5505938056 +59 44 14.374738680   16.44 16.27     ~ 55 0
67 Ton 28 Sy1 10 04 02.6102134920 +28 55 35.329310688   16.17 15.7     ~ 192 0
68 QSO J1005+0134 QSO 10 05 35.2474303944 +01 34 45.713350380   17.21 16.89     ~ 59 0
69 QSO J1009+0713 QSO 10 09 02.0682581400 +07 13 43.900917312   17.41 17.27     ~ 72 1
70 Ton 488 Sy1 10 10 00.6871776552 +30 03 21.574537668   17.35 17.00     ~ 81 0
71 QSO B1011-040 Sy1 10 14 20.6738908080 -04 18 40.372940484   15.49 15.5     ~ 157 0
72 QSO J1016+4706 QSO 10 16 22.6163321640 +47 06 43.342982964   17.40 17.29     ~ 47 0
73 LBQS 1019+0147 QSO 10 22 18.9951068448 +01 32 18.805950420   16.98 16.82     ~ 52 0
74 LEDA 2383543 Sy1 10 32 16.1349757824 +50 51 19.690798320   18.20 17.98     ~ 53 0
75 QSO B1048+342 Sy1 10 51 43.8916339296 +33 59 26.683392840   17.11 16.79     ~ 210 0
76 PG 1049-005 Sy1 10 51 51.4474066944 -00 51 17.707987476   15.98 15.78     ~ 188 0
77 QSO J1059+1441 QSO 10 59 45.2329109520 +14 41 42.895491540   17.37 17.18     ~ 41 0
78 QSO J1059+2517 QSO 10 59 58.8146194488 +25 17 08.860212924   17.82 17.71     ~ 31 0
79 2MASS J11031293+4141549 Sy1 11 03 12.9342552360 +41 41 54.957214860   17.04 16.76     ~ 47 1
80 Ton 52 QSO 11 04 06.9374984688 +31 41 11.527697760   17.46 17.26     ~ 45 0
81 Ton 1329 QSO 11 05 39.8136560592 +34 25 34.684905360   16.377 16.275 15.762   ~ 65 0
82 NGC 3516 Sy1 11 06 47.4632200800 +72 34 07.298374656   13.12 12.40     ~ 1638 0
83 QSO J1111+5547 QSO 11 11 32.1904401432 +55 47 26.084260608   17.20 17.02     ~ 61 0
84 QSO J1112+3539 QSO 11 12 39.1139750040 +35 39 28.202571108   16.9 18.06 17.1   ~ 39 0
85 Ton 576 Sy1 11 17 54.3260732712 +26 34 16.600742328   17.23 17.07     ~ 38 0
86 LEDA 34570 Sy1 11 18 30.2894794680 +40 25 54.068810952   16.34 16.21     ~ 246 0
87 Ton 1388 Sy1 11 19 08.6786220240 +21 19 17.987085948   14.91 14.80     ~ 492 0
88 2MASS J11211423+0325466 Sy1 11 21 14.2212988224 +03 25 46.741703592   17.83 17.57     ~ 43 0
89 QSO J1122+5755 QSO 11 22 44.8870591656 +57 55 43.094470944   17.92 17.64     ~ 42 1
90 2MASS J11243917+4201450 Sy1 11 24 39.1797883104 +42 01 45.014547252   16.45 16.28     ~ 175 0
91 SBSG 1123+594A QSO 11 25 53.7896103984 +59 10 21.552070044   17.02 16.80     ~ 69 0
92 Ton 580 Bla 11 31 09.4824534600 +31 14 05.506804464   16.22 16.05 15.8   ~ 156 1
93 QSO J1133+0327 QSO 11 33 27.7852480272 +03 27 19.293193944   17.80 17.74     ~ 57 0
94 QSO J1134+2555 QSO 11 34 57.6251445336 +25 55 27.894162684   16.5 17.13 17.0   ~ 36 0
95 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1765 1
96 ICRF J113957.0+654749 Sy1 11 39 57.0254367168 +65 47 49.483232880   16.50 16.32     ~ 528 1
97 LB 2126 QSO 11 51 20.4599373144 +54 37 33.049962300   16.03 15.78     ~ 155 0
98 2MASS J11575874-0022208 Sy1 11 57 58.7285036808 -00 22 20.902264464   17.65 17.27     ~ 65 0
99 NGC 4051 Sy1 12 03 09.6101337312 +44 31 52.682601288   11.08 12.92 9.94   ~ 2270 1
100 QSO J1204+2754 Bla 12 04 42.1097215992 +27 54 11.869350264   15.64 15.60     ~ 429 0
101 QSO J1207+2624 QSO 12 07 20.9951158488 +26 24 29.095498188   17.67 17.45     ~ 24 0
102 QSO J1208+4540 QSO 12 08 58.0107013896 +45 40 35.421692952   16.00 15.70     ~ 194 0
103 7C 1208+3213 Sy1 12 10 37.5729097488 +31 57 06.019112484   16.91 16.68     ~ 92 1
104 2MASS J12111454+3657395 Sy1 12 11 14.5644832656 +36 57 39.517567848   17.10 16.78     ~ 39 0
105 PG 1216+069 Sy1 12 19 20.9318278680 +06 38 38.467059252   15.68 15.65     ~ 302 0
106 2MASS J12203509+3853166 Sy1 12 20 35.1003576024 +38 53 16.470076776   17.23 16.83     ~ 46 0
107 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
108 2MASS J12305003+0115226 Sy1 12 30 50.0331165552 +01 15 22.598028288   14.44 14.42     ~ 102 0
109 LBQS 1230-0015 Bla 12 33 04.0514120328 -00 31 34.179576564   18.02 17.87 16.8   ~ 75 1
110 QSO J1233+4758 QSO 12 33 35.0734049904 +47 58 00.440179968   17.69 17.67     ~ 68 1
111 2MASS J12360401+2641358 Sy1 12 36 04.0249656696 +26 41 35.938231476   18.15 17.85     ~ 35 0
112 QSO J1241+5721 QSO 12 41 54.0240017616 +57 21 07.358808924   18.03 17.94     ~ 51 0
113 QSO J1245+3356 QSO 12 45 11.2585883616 +33 56 10.098792816   17.06 16.88     ~ 62 0
114 LB 2522 Sy1 13 01 12.9250750776 +59 02 06.693816732   16.04 15.89     ~ 298 0
115 QSO J1305-1033 Bla 13 05 33.0150535680 -10 33 19.430383680   15.18 15.23 14.46   ~ 624 1
116 PB 159 QSO 13 22 22.6814915184 +46 45 35.258462316   17.80 17.69     ~ 52 0
117 QSO J1327+4435 QSO 13 27 04.1365014024 +44 35 05.008694784   18.56 18.34     ~ 39 0
118 2MASS J13304515+2813216 QSO 13 30 45.1502930544 +28 13 21.557805456   18.25 18.05     ~ 32 0
119 2MASS J13305328+3119306 Sy1 13 30 53.2737822312 +31 19 30.581964264   17.65 17.41     ~ 60 0
120 QSO J1341+4123 QSO 13 41 00.7893930432 +41 23 14.130152880   17.04 16.76     ~ 131 0
121 2MASS J13420657+0505237 Sy1 13 42 06.5690532936 +05 05 23.913862224   17.54 17.32     ~ 73 0
122 LEDA 3096287 Sy1 13 42 31.2262148568 +38 29 03.322114584   17.67 17.42     ~ 42 0
123 PB 4055 QSO 13 42 46.8916070688 +18 44 43.680946092           ~ 27 0
124 LBQS 1340-0038 QSO 13 42 51.6065445120 -00 53 45.385834848   17.15 16.98 17.418 16.198 ~ 87 0
125 Z 336-28 Sy1 13 53 03.4348964112 +69 18 29.410910460   15.15 14.46     ~ 812 1
126 2MASS J13562557+2515238 Sy1 13 56 25.5590896728 +25 15 23.681819880   20.82 20.08     ~ 35 1
127 2MASS J13571260+1704439 Sy1 13 57 12.6115059936 +17 04 44.087119356   18.30 17.87     ~ 29 0
128 QSO B1354+0450 QSO 13 57 26.2745760120 +04 35 41.516873736   17.59 17.23     ~ 59 0
129 QSO J1409+2618 QSO 14 09 23.9085820008 +26 18 21.056458176   16.07 15.74     ~ 193 0
130 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
131 PB 2049 QSO 14 19 10.2069131136 +42 07 46.911715896   16.9 17.31 17.1   ~ 50 0
132 QSO J1435+3604 QSO 14 35 11.5257590496 +36 04 37.175594052   17.30 17.22     ~ 63 0
133 Z 296-15 Sy1 14 36 22.0820611632 +58 47 39.394934844   14.19 13.79     ~ 592 0
134 7C 143544.20+505906.00 Sy1 14 37 26.1399679584 +50 45 55.886964696   17.89 17.67     ~ 47 1
135 LBQS 1435-0134 QSO 14 37 48.2855255136 -01 47 10.816509804   16.11 15.78 16.39   ~ 88 1
136 QSO J1445+3428 QSO 14 45 11.2765536360 +34 28 25.462764444   17.82 17.73     ~ 39 0
137 2MASX J14510879+2709272 Sy1 14 51 08.7647938560 +27 09 26.962707132   15.01 15.01     ~ 239 0
138 [VV2006] J151428.6+361958 QSO 15 14 28.6535299104 +36 19 57.992925720   18.11 18.04     ~ 38 0
139 2MASS J15213967+0337292 Sy1 15 21 39.6663171288 +03 37 29.240164848   17.56 17.22     ~ 54 0
140 QSO B1521+1009 QSO 15 24 24.5234088744 +09 58 29.087917572   15.74 16.2     ~ 145 0
141 Ton 236 Sy1 15 28 40.6111052016 +28 25 29.842820004   16.44 16.39     ~ 76 0
142 Mrk 290 Sy1 15 35 52.4031021552 +57 54 09.515660508   15.55 15.27     ~ 575 0
143 QSO J1545+0936 QSO 15 45 53.4846931800 +09 36 20.499019380   16.93 16.87     ~ 28 0
144 QSO J1550+4001 QSO 15 50 48.3036926256 +40 01 44.915421108   17.36 17.30     ~ 50 0
145 QSO J1553+3548 QSO 15 53 04.9286325480 +35 48 28.565396856   16.93 16.73     ~ 51 0
146 QSO J1555+3628 QSO 15 55 04.4016223056 +36 28 47.958261960   17.3 18.10 17.6   ~ 48 0
147 Mrk 876 Sy1 16 13 57.1795021224 +65 43 09.952685328   16.03 15.49     ~ 620 0
148 QSO J1616+4154 QSO 16 16 49.4247047256 +41 54 16.356182328   17.41 17.29     ~ 54 0
149 QSO J1619+3342 QSO 16 19 16.5426908544 +33 42 38.375748828   17.30 17.26     ~ 61 0
150 QSO B1626+5529 Sy1 16 27 56.1123628752 +55 22 31.559061504   15.79 15.68     ~ 232 1
151 QSO B1630+3744 QSO 16 32 01.1117931960 +37 37 49.980505332   16.50 16.30     ~ 183 0
152 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 632 1
153 Mrk 509 Sy1 20 44 09.7504483224 -10 43 24.727155528   13.35 13.12 10.7   ~ 1370 0
154 Mrk 1513 Sy1 21 32 27.8162556672 +10 08 19.252365396   14.92 14.64     ~ 651 0
155 2MASS J21545109-4414057 Sy1 21 54 51.1074371232 -44 14 05.742036672     15.80     ~ 33 0
156 PHL 1811 Sy1 21 55 01.5124437432 -09 22 24.349496808   13.9 16.8 14.1   ~ 200 1
157 Z 495-18 Sy1 22 42 39.3363009144 +29 43 31.302092640   14.86 14.16     ~ 748 1
158 2MASS J22484115-5109532 Sy1 22 48 41.1707472480 -51 09 53.322381180   15.60 15.43 15.5   ~ 77 0
159 NAME MR 2251-178 Sy1 22 54 05.8858611984 -17 34 55.402233708   14.99 14.36 15.12   ~ 467 4
160 QSO J2257+1340 QSO 22 57 38.2067032296 +13 40 45.501519396   17.25 17.15     ~ 47 0
161 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3
162 PB 5524 QSO 23 45 00.4378353384 -00 59 36.075601680   17.66 17.44     ~ 59 0

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