2018A&A...616A.114D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST19:40:19

2018A&A...616A.114D - Astronomy and Astrophysics, volume 616A, 114-114 (2018/8-1)

C IV broad absorption line disappearance in a large SDSS QSO sample.

DE CICCO D., BRANDT W.N., GRIER C.J., PAOLILLO M., FILIZ AK N., SCHNEIDER D.P. and TRUMP J.R.

Abstract (from CDS):


Context. Broad absorption lines (BALs) in the spectra of quasi-stellar objects (QSOs) originate from outflowing winds along our line of sight; winds are thought to originate from the inner regions of the QSO accretion disk, close to the central supermassive black hole (SMBH). These winds likely play a role in galaxy evolution and are responsible for aiding the accretion mechanism onto the SMBH. Several works have shown that BAL equivalent widths can change on typical timescales from months to years; such variability is generally attributed to changes in the covering factor (due to rotation and/or changes in the wind structure) and/or in the ionization level of the gas.
Aims. We investigate BAL variability, focusing on BAL disappearance.
Methods. We analyze multi-epoch spectra of more than 1500 QSOs - the largest sample ever used for such a study - observed by different programs from the Sloan Digital Sky Survey-I/II/III (SDSS-I/II/III), and search for disappearing CIV BALs. The spectra cover a rest-frame time baseline ranging from 0.28 to 4.9yr; the source redshifts range from 1.68 to 4.27.
Results. We detect 73 disappearing BALs in the spectra of 67 unique sources. This corresponds to 3.9% of BALs disappearing within 4.9yr (rest frame), and 5.1% of our BAL QSOs exhibit at least one disappearing BAL within 4.9yr (rest frame). We estimate the average lifetime of a BAL along our line of sight (~=80-100yr), which appears consistent with the accretion disk orbital time at distances where winds are thought to originate. We inspect various properties of the disappearing BAL sample and compare them to the corresponding properties of our main sample. We also investigate the existence of a correlation in the variability of multiple troughs in the same spectrum, and find it persistent at large velocity offsets between BAL pairs, suggesting that a mechanism extending on a global scale is necessary to explain the phenomenon. We select a more reliable sample of disappearing BALs on the basis of some criteria adopted in a previous publication, where a subset of our current sample was analyzed, and compare the findings from the two works, obtaining generally consistent results.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: active - quasars: general - quasars: absorption lines - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/616/A114): tablea1.dat tablea2.dat>

Simbad objects: 72

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Number of rows : 72

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 SDSS J004022.40+005939.6 QSO 00 40 22.4062897209 +00 59 39.697576724   20.65 20.06     ~ 23 0
2 [VV2006] J021755.2-090141 QSO 02 17 55.2503064339 -09 01 41.044947720   19.43 19.12     ~ 21 0
3 [VV2006] J030004.8-063225 QSO 03 00 04.7488736700 -06 32 24.774517243   19.69 19.43     ~ 18 0
4 [VV2006] J074650.6+182028 QSO 07 46 50.5984971106 +18 20 28.804235638   18.81 18.58     ~ 23 0
5 QSO J0811+5007 QSO 08 11 02.9134445507 +50 07 24.306040587   19.65 19.39     ~ 41 0
6 [VV2006] J081338.3+240729 QSO 08 13 38.3351902396 +24 07 29.105701290   19.27 19.04     ~ 19 0
7 [VV2006] J085904.6+042647 QSO 08 59 04.5903414206 +04 26 47.804080161   19.49 19.29     ~ 27 0
8 [VV2006] J090757.4+333116 QSO 09 07 57.3822960628 +33 31 16.290931719   19.67 19.43     ~ 18 0
9 [VV2006] J091159.4+442526 QSO 09 11 59.3642842075 +44 25 26.858229062   18.50 18.25     ~ 20 0
10 [VV2006] J091808.8+005457 QSO 09 18 08.8063850070 +00 54 57.803898422   20.11 19.54     ~ 23 0
11 [VV2006] J091944.6+560242 QSO 09 19 44.5339976549 +56 02 43.399028435   18.8 19.10 19.1   ~ 25 0
12 SDSS J092418.53+271851.6 QSO 09 24 18.5455113836 +27 18 51.548306059   19.72 19.40     ~ 16 0
13 [VV2006] J092444.7-000924 QSO 09 24 44.6661460885 -00 09 24.086508508   19.94 19.73     ~ 24 0
14 SDSS J092851.40+311627.0 QSO 09 28 51.4135040062 +31 16 26.967738331   19.55 19.23     ~ 17 0
15 [VV2006] J093418.3+355508 QSO 09 34 18.2836600198 +35 55 08.343831013   19.56 19.30     ~ 23 0
16 [VV2006] J093620.6+004649 QSO 09 36 20.5229815845 +00 46 49.271331010   19.12 18.90     ~ 26 0
17 [VV2006] J094437.6+104726 QSO 09 44 37.5706651798 +10 47 26.833213377   19.67 19.41     ~ 20 0
18 QSO B0944+4746 QSO 09 48 04.8934508378 +47 32 23.047581812   18.82 18.58     ~ 23 0
19 [VV2006] J094806.6+045812 QSO 09 48 06.5906752294 +04 58 11.764052943   19.29 19.08     ~ 24 0
20 [VV2006] J095035.1+560253 QSO 09 50 35.1112638020 +56 02 53.169063342   19.67 19.40     ~ 21 0
21 [VV2006] J100117.0+642009 QSO 10 01 17.0109345875 +64 20 09.405625425   19.89 19.61     ~ 21 0
22 [VV2006] J100132.0+053323 QSO 10 01 31.9581144547 +05 33 22.700447060   19.41 19.19     ~ 23 0
23 [VV2006] J100607.2+625320 QSO 10 06 07.1741529872 +62 53 20.242128513   19.72 19.55     ~ 24 0
24 [VV2006] J102250.1+483631 QSO 10 22 50.1669948367 +48 36 31.226295097   19.51 19.18     ~ 25 0
25 SDSS J102435.38+372637.0 QSO 10 24 35.3926943437 +37 26 37.054470519   19.16 18.95     ~ 16 0
26 [VV2006] J102812.0+381133 QSO 10 28 12.0919485132 +38 11 32.944341204   19.85 19.66     ~ 20 0
27 [VV2006] J103311.8+603146 QSO 10 33 11.7783695486 +60 31 46.606067812   19.48 19.02     ~ 19 0
28 [VV2006] J104509.7+480429 QSO 10 45 09.6678062016 +48 04 29.796560586   19.93 19.70     ~ 20 0
29 [VV2006] J104841.0+000042 QSO 10 48 41.0244687930 +00 00 42.845863916   19.62 19.35     ~ 38 0
30 [VV2006] J110038.7+450626 QSO 11 00 38.7257336805 +45 06 26.198647490   20.02 19.81     ~ 22 0
31 [VV2006] J110549.4+663457 QSO 11 05 49.3843970519 +66 34 56.922946250   19.77 19.48     ~ 18 0
32 [VV2006] J110906.4+640704 QSO 11 09 06.3155399370 +64 07 04.803579324   18.13 17.87     ~ 24 0
33 [VV2006] J112602.8+003418 QSO 11 26 02.8077912031 +00 34 18.352023646   19.10 18.75     ~ 30 0
34 [VV2006] J113236.0+030335 QSO 11 32 36.0655068803 +03 03 35.117076856   19.10 18.88     ~ 23 0
35 SDSS J113423.01+150059.3 QSO 11 34 23.0083313036 +15 00 59.245527866   19.43 19.24     ~ 21 0
36 [VV2006] J113438.5+091012 QSO 11 34 38.5750110312 +09 10 12.590927222   19.51 19.34     ~ 22 0
37 [VV2006] J113754.9+460227 QSO 11 37 54.9230594651 +46 02 27.459703965   19.71 19.49     ~ 17 0
38 [VV2006] J114546.2+032251 QSO 11 45 46.2185639221 +03 22 52.036994617   19.60 19.39     ~ 30 0
39 [VV2006] J115244.2+030624 QSO 11 52 44.2138466929 +03 06 24.421696156   19.09 18.76     ~ 25 0
40 SDSS J115707.36+333257.9 QSO 11 57 07.3667064339 +33 32 57.900969508   19.49 19.29     ~ 21 0
41 [VV2006] J124505.6+561430 QSO 12 45 05.6576950981 +56 14 30.504048056   19.44 19.22     ~ 19 0
42 [VV2006] J125432.8+435228 QSO 12 54 32.7833188749 +43 52 28.946866201   19.79 19.60     ~ 15 0
43 QSO B1303+4641 QSO 13 05 42.3605889518 +46 25 03.467441929   19.45 19.25     ~ 21 0
44 [VV2006] J131038.1+113618 QSO 13 10 38.1748992069 +11 36 17.910251025   19.43 19.29     ~ 19 0
45 [VV2006] J131524.7+130411 QSO 13 15 24.7138396117 +13 04 11.866561326   19.50 19.33     ~ 20 0
46 [VV2006] J132216.2+052446 QSO 13 22 16.2506412280 +05 24 46.316347126   18.94 18.66     ~ 24 0
47 [VV2006] J132508.9+122313 QSO 13 25 08.8272491058 +12 23 14.245157943   18.72 18.51     ~ 21 0
48 [VV2006] J133119.1+035657 QSO 13 31 19.1412176118 +03 56 58.058989853   18.71 18.43     ~ 23 0
49 [VV2006] J133152.2+051137 QSO 13 31 52.1967240940 +05 11 38.001039598   18.91 18.63     ~ 24 0
50 SDSS J133211.21+392825.9 QSO 13 32 11.2140012657 +39 28 25.862944224   19.64 19.46     ~ 18 0
51 [VV2006] J134544.6+002810 QSO 13 45 44.5481615678 +00 28 10.793015669   18.89 18.65     ~ 36 0
52 [VV2006] J135910.4+563617 QSO 13 59 10.4470835699 +56 36 17.360331121   18.95 18.55     ~ 22 0
53 [VV2000] J140051.9+463530 QSO 14 00 51.7920636077 +46 35 29.957960733   18.42 18.25     ~ 25 0
54 [VV2006] J140231.8+643610 QSO 14 02 31.8092039387 +64 36 10.443956543   19.77 19.57     ~ 21 0
55 [VV2006] J140502.0+444759 QSO 14 05 01.9418714816 +44 47 59.829952282   18.59 18.31     ~ 27 0
56 [VV2006] J141407.2+562010 QSO 14 14 07.2550037232 +56 20 10.385689366   19.58 19.38     ~ 21 0
57 [VV2006] J142132.0+375230 QSO 14 21 32.0103581363 +37 52 30.340270048   19.42 19.26     ~ 21 0
58 [VV2006] J142140.3-020240 QSO 14 21 40.2725108065 -02 02 39.059418066   19.63 19.26     ~ 26 0
59 [VV2006] J142514.6+632703 QSO 14 25 14.6078022356 +63 27 03.953566148   18.69 18.45     ~ 20 0
60 SDSS J142813.72+233742.8 QSO 14 28 13.7232537434 +23 37 42.811882415   19.52 19.27     ~ 16 0
61 [VV2006] J143821.7+393407 QSO 14 38 21.6062956425 +39 34 07.290960196   19.45 19.15     ~ 20 0
62 [VV2006] J151610.1+434506 QSO 15 16 10.0858781053 +43 45 06.705177324   19.45 19.22     ~ 18 0
63 [VV2006] J152149.8+010236 QSO 15 21 49.7837308266 +01 02 36.353646872   19.16 18.92     ~ 25 0
64 [VV2006] J152244.0+032719 QSO 15 22 43.9923224461 +03 27 19.793128430   19.32 19.06     ~ 25 0
65 [VV2006] J154256.1+372746 QSO 15 42 56.0648022431 +37 27 46.499693853   19.82 19.62     ~ 17 0
66 [VV2006] J154621.3+521303 QSO 15 46 21.2674201425 +52 13 03.400120207   19.75 19.57     ~ 19 0
67 [VV2006] J154655.6+370739 QSO 15 46 55.5587697278 +37 07 39.282543297   19.74 19.55     ~ 18 0
68 [VV2006] J155119.1+304019 QSO 15 51 19.1512136623 +30 40 19.809765074   19.08 18.86     ~ 23 0
69 [VV2006] J155135.8+464609 QSO 15 51 35.7846118395 +46 46 09.451700546   19.90 19.57     ~ 20 0
70 [VV2006] J163844.5+350857 QSO 16 38 44.4235838658 +35 08 57.502698640   19.91 19.50     ~ 21 0
71 [VV2006] J163847.4+232716 QSO 16 38 47.4226905442 +23 27 16.399342436   20.87 19.72     ~ 25 0
72 QSO J1655+3945 QSO 16 55 43.2366712769 +39 45 19.870709705   18.69 18.39     ~ 36 0

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2020.07.11-19:40:19

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