Spectral changes and BLR kinematics of eruptive changing-look AGN
نویسندگان
چکیده
منابع مشابه
X-ray Variability and Spectral Scaling: a Measure of Blr Sizes in Agn
We developed a new method of determination of the size of the broad emission-line region (BLR) in active galactic nuclei. This method relates the radius of the broad-line region of AGN to the soft X-ray luminosity and spectral index. Comparing the BLR distances calculated from our model to the BLR distances determined by reverberation mapping shows that our scaling law agrees with the R ∼ L1/2 ...
متن کاملA search for changing-look AGN in the Grossan catalog
We observed with XMM-Newton 4 objects selected from the Grossan (1992) catalog, with the aim to search for new ‘changing-look’ AGN. The sample includes all the sources which showed in subsequent observations a flux much lower than the one measured with HEAO A-1: NGC 7674, NGC 4968, IRAS 13218+0552 and NGC 1667. None of the sources was caught in a high flux state during the XMM-Newton observatio...
متن کاملIc 751: a New Changing Look Agn Discovered by Nustar
We present results of five Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the type 2 active galactic nucleus (AGN) in IC 751, three of which were performed simultaneously with XMM-Newton or Swift/ X-Ray Telescope. We find that the nuclear X-ray source underwent a clear transition from a Compton-thick (N 2 10 cm H 24 2 ́ ) to a Compton-thin (N 4 10 cm H 23 2 ́ ) state on timesc...
متن کاملBLR sizes and the X-ray spectrum in AGN
Recent ROSAT studies of narrow-line Seyfert 1 galaxies revealed these objects (with FWHM Hβ ≤ 2000 km s−1) generally show steeper soft X-ray spectra than broad line Seyfert 1’s and that there are noAGNwith broad lines and steep X-ray spectra. We derive a simple theoretical model which explains this observed correlation between the line width and the spectral index for Seyfert 1 galaxies. Assumi...
متن کاملBLR velocities in optically and X - ray selected AGN samples
We have analyzed optical spectra of 473 X-ray and 235 optically selected AGNs, to study their emission line properties. We present results of an analysis of the Hβ linewidths. We find that the linewidth distribution of quasars is shifted towards higher velocities (=4300 km s) compared to the distribution of Sy 1s (=3000 km s). There are no Narrow Line Quasars, i.e. there are no AGNs with ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Contributions of the Astronomical Observatory Skalnaté Pleso
سال: 2020
ISSN: 1336-0337
DOI: 10.31577/caosp.2020.50.1.318