Line Shape Variability in a Sample of AGN with Broad Lines

Ilić, D.; Shapovalova, A. I.; Burenkov, A. N.; Chavushyan, V.; Kovačević, Aleksandra

doi:10.1007/s12036-015-9360-y

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…Nearby AGN are currently monitored by several groups (e.g., Ilić et al, 2015;Barth et al, 2015;Fausnaugh et al, 2016;Bentz et al, 2016a,b;Du et al, 2016a). SDSS quasar sample has been recently monitored for six months within the frame of the SDSS-RM project (Shen et al, 2016) which allowed to provide preliminary estimate of nine Hβ langs and six Mg II lags for objects with redshifts above 0.3, and this program is being extended now, covering 849 sources in total, with cadence of 12 epochs per year.…”

Section: Blr Reverberationmentioning

confidence: 99%

Astronomical Distance Determination in the Space Age

et al. 2018

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The formal division of the distance indicators into primary and secondary leads to difficulties in description of methods which can actually be used in two ways: with, and without the support of the other methods for scaling. Thus instead of concentrating on the scaling requirement we concentrate on all methods of distance determination to extragalactic sources which are designated, at least formally, to use for individual sources. Among those, the Supernovae Ia is clearly the leader due to its enormous success in determina- tion of the expansion rate of the Universe. However, new methods are rapidly developing, and there is also a progress in more traditional methods. We give a general overview of the methods but we mostly concentrate on the most recent developments in each field, and future expectations.

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Section: Blr Reverberationmentioning

confidence: 99%

Astronomical Distance Determination in the Space Age

et al. 2018

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“…Gas clouds located in the BLR rotate around the black hole at velocities up to a few 10000 km s −1 . Variations of both the overall flux and the shape of the broad emission lines (BEL) have been reported (e.g., Sulentic et al 2000;Shapovalova et al 2010;Ilić et al 2015). In all the publications mentioned above BELs at optical wavelengths were used, but here we have used infrared spectra.…”

Section: Introductionmentioning

confidence: 99%

Analyzing temporal variations of AGN emission line profiles in the context of (dusty) cloud structure formation in the broad line region

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Pott

Landt

et al. 2019

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The formation processes and the exact appearance of the dust torus and broad line region (BLR) of active galactic nuclei (AGN) are under debate. Theoretical studies show a possible connection between the dust torus and BLR through a common origin in the accretion disk. However observationally the dust torus and BLR are typically studied separately. NGC 4151 is possibly one of the best suited Seyfert 1 galaxies for simultaneous examinations because of its high number of both photometric and spectroscopic observations in the past. Here we compare changes of the dust radius to shape variations of broad emission lines (BEL). While the radius of the dust torus decreased by almost a factor of two from 2004 to 2006 shape variations can be seen in the red wing of BELs of NGC 4151. These simultaneous changes are discussed in a dust and BEL formation scheme. We also use the BEL shape variations to assess possible cloud distributions, especially in azimuthal direction, which could be responsible for the observed variations. Our findings can best be explained in the framework of a dust inflated accretion disk. The changes in the BELs suggest that this dusty cloud formation does not happen continuously, and over the whole accretion disk, but on the contrary in spatially confined areas over rather short amount of times. We derive limits to the azimuthal extension of the observed localized BEL flux enhancement event.

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