100 citations · 677 across the 52 of their papers we have counts for
27 papers · 1 filter
The evolution of obscured AGN across cosmic time -- A large quasar survey for the 2040s
Tanya Urrutia, Darshan Kakkad, Paula Sánchez-Sáez +21
We propose a large quasar demographic optical multi-object spectroscopic (MOS) survey targeting over 50 million AGN candidates up to the highest redshifts possible in the optical (…
AGN STORM 2: X. The origin of the interband continuum delays in Mrk 817
Hagai Netzer, Michael R. Goad, Aaron J. Barth +26
The local (z=0.0315) AGN Mrk 817, was monitored over more than 500 days with space-borne and ground-based instruments as part of a large international campaign AGN STORM 2. Here, w…
AGN STORM 2: VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
Maryam Dehghanian, Nahum Arav, Gerard A. Kriss +39
We observed the Seyfert 1 galaxy Mrk817 during an intensive multi-wavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lin…
Optical Continuum Reverberation Mapping of a Candidate IMBH in a Nearby Seyfert 1 Galaxy
Wenwen Zuo, Hengxiao Guo, Jingbo Sun +25
To investigate the short-term variability and determine the size of the optical continuum emitting region of intermediate-mass black holes (IMBHs), we carried out high-cadence, mul…
AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817
Y. Homayouni, Gerard A. Kriss, Gisella De Rosa +49
An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant vari…
The LSST AGN Data Challenge: Selection methods
Đorđe V. Savić, Isidora Jankov, Weixiang Yu +12
Development of the Rubin Observatory Legacy Survey of Space and Time (LSST) includes a series of Data Challenges (DC) arranged by various LSST Scientific Collaborations (SC) that a…
Detecting long-period variability in SDSS Stripe 82 standards catalog
Marta Fatović, Lovro Palaversa, Krešimir Tisanić +5
We report the results of a search for long-period ( days) periodic variability in SDSS Stripe 82 standards catalog. The SDSS coverage of Stripe 82 enables such a search…
AGN STORM 2: II. Ultraviolet Observations of Mrk817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope
Y. Homayouni, Gisella De Rosa, Rachel Plesha +62
We present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk817 using 165 spectra obtained with the Cosmic Or…
Expectations for time-delay measurements in active galactic nuclei with the Vera Rubin Observatory
Bozena Czerny, Swayamtrupta Panda, Raj Prince +10
The Vera Rubin Observatory will provide an unprecedented set of time-dependent observations of the sky. The planned Legacy Survey of Space and Time (LSST) operating for 10 years wi…
Detection of eccentric close-binary supermassive black holes with incomplete interferometric data
Andjelka Kovacevic, Yu-Yang Songsheng, Jian-Min Wang +1
Recent studies have proposed that GRAVITY+ instrument is able to trace the circular orbit of the subparsec close-binary supermassive black holes (CB-SMBHs) by measuring the photoce…
The broad emission line asymmetry in low mass ratio of supermassive binary black holes on elliptical orbits
Saša Simić, Luka Č. Popović, Andjelka Kovačević +1
We investigate the broad line profiles emitted from a system supermassive binary black hole (SMBBH) having elliptical orbits and low mass ratio of . Our model assu…
Conditional Neural Process for non-parametric modeling of AGN light curve
Iva Cvorovic-Hajdinjak, Andjelka B. Kovacevic, Dragana Ilic +6
The consequences of complex disturbed environments in the vicinity of a supermassive black hole are not well represented by standard statistical models of optical variability in ac…
On possible proxies of AGN light curves cadence selection in future time domain surveys
Andjelka B. Kovacevic, Dragana Ilic, Luka C. Popovic +6
Motivated by upcoming photometric and spectroscopic surveys (Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), Manuakea Spectroscopic Explorer), we design the stati…
LSST AGN SC Cadence Note: Two metrics on AGN variability observable
Andjelka Kovacevic, Dragana Ilic, Isidora Jankov +5
We have developed two metrics related to AGN variability observables (time-lags, periodicity, and Structure Function (SF)) to evaluate LSST OpSim FBS 1.5, 1.6, 1.7 performance in A…
Differential interferometry of close binary of supermassive black holes in an elliptical configuration
Andjelka Kovacevic, Yu-Yang Songsheng, Jian-Min Wang +1
The Very Large Telescope Interferometer (VLTI), and the Extremely Large Telescope (ELT) will be a robust astrophysics suite offering the opportunity of probing the structure and dy…
Two-dimensional correlation analysis of periodicity in active galactic nuclei time series
Andjelka B Kovacevic, Luka C. Popovic, Dragana Ilic
The active galactic nuclei (AGN) are among the most powerful sources with an inherent, pronounced and random variation of brightness. The randomness of their time series is so subt…
Confirmed short periodic variability of subparsec supermassive binary black hole candidate Mrk 231
Andjelka B. Kovacevic, Tignfeng Yi, Xinyu Dai +3
Here we confirm the short periodic variability of a subparsec supermassive binary black hole (SMBBH) candidate Mrk 231 in the extended optical photometric data set collected by the…
Variability and the size-luminosity relation of the intermediate mass AGN in NGC 4395
Hojin Cho, Jong-Hak Woo, Edmund Hodges-Kluck +31
We present the variability study of the lowest-luminosity Seyfert 1 galaxy NGC 4395 based on the photometric monitoring campaigns in 2017 and 2018. Using 22 ground-based and space…
Kinematic signatures of reverberation mapping of close binaries of supermassive black holes in active galactic nuclei III. The case of elliptical orbits
Andjelka Kovacevic, Jian-Min Wang, Luka. C. Popovic
An intense search for kinematic signatures of reverberation mapping of close binary SMBH (SMBBH) is currently ongoing. Elliptical SMBBH systems (i.e. both orbits and disc-like broa…
Long-term monitoring of the broad-line region properties in a selected sample of AGN
Dragana Ilic, Alla I. Shapovalova, Luka C. Popovic +8
We present the results of the long-term optical monitoring campaign of active galactic nuclei (AGN) coordinated by the Special Astrophysical Observatory of the Russian Academy of S…
Oscillatory patterns in the light curves of 5 long-term monitored type 1 AGN
Andjelka B Kovacevic, Ernesto Perez-Hernandez, Luka C. Popovic +3
A new combined data of 5 well known type 1 AGN are probed with a novel hybrid method in a search for oscillatory behavior. Additional analysis of artificial light curves obtained f…
Periodicity in the continua and broad line curves of a quasar E1821+643
Andjelka Kovacevic, Luka C. Popovic, Alla I. Shapovalova +1
Here we present an in-depth analysis of the periodicity of the continua and broad emission lines of a quasar E1821+643. We applied non-parametric composite models, the linear sum o…
On the time delay evolution of five Active Galactic Nuclei
Andjelka Kovacevic, Luka C. Popovic, Alla I. Shapovalova +3
Here we investigate light curves of the continuum and emission lines of five type 1 active galactic nuclei (AGN) from our monitoring campaign, to test time-evolution of their time…
Line shape variability in a sample of AGN with broad lines
D. Ilic, L. C. Popovic, A. I. Shapovalova +3
The spectral variability of active galactic nuclei (AGN) is one of their key features that enables us to study in more details the structure of AGN emitting regions. Especially, th…