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Browsing IIAP Publications by Subject "Active galactic nuclei"

Browsing IIAP Publications by Subject "Active galactic nuclei"

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  • An accreting supermassive black hole buried in a faint dwarf galaxy 
    Paswan, Abhishek; Das, Mousumi; Rubinur, K (The American Astronomical Society, 2024-09-10)
    In the last decade, there have been several discoveries of active galactic nuclei (AGN) in dwarf galaxies including an AGN in an ultracompact dwarf galaxy with a black hole mass >106 Me. However, finding a supermassive ...
  • Anomalous narrow line Seyfert I galaxies from SDSS DR17 
    Tiwari, Arihant; Rachana; Vivek, M; Rakshit, S (American Astronomical Society, 2026-03-01)
    We present an analysis of 22,656 narrow-line Seyfert 1 galaxies (NLSy1s) from the Sloan Digital Sky Survey (SDSS) DR17 (0.1 ≤ z ≤ 0.9), identifying a sample of spectroscopically anomalous sources. These anomalies were ...
  • The Black Hole-Galaxy Connection: Interplay between Feedback, Obscuration, and Host Galaxy Substructure 
    Juneau, Stephanie; Goulding, Andy D; Banfield, Julie; Bianchi, Stefano; Duc, Pierre-Alain; Ho, I. -Ting; Dopita, Michael A; Scharwächter, Julia; Bauer, Franz E; Groves, Brent; Alexander, David M; Davies, Rebecca L; Elbaz, David; Freeland, Emily; Hampton, Elise; Kewley, Lisa J; Nikutta, Robert; Shastri, Prajval; Shu, Xinwen; Vogt, Frederic P. A; Wang, Tao; Wong, O. Ivy; Woo, Jong-Hak (American Astronomical Society, 2022-02-01)
    There is growing evidence for physical influence between supermassive black holes and their host galaxies. We present a case study of the nearby galaxy NGC 7582, for which we find evidence that galactic substructure plays ...
  • Breaks in the X-ray spectra of high-redshift blazars and the intervening medium 
    Gaur, Haritma; Mohan, Prashanth; Pandey, Ashwani (IOP Publishing, 2021-06-10)
    Flat-spectrum radio quasars (FSRQs) are a subclass of blazars characterized by prominent optical emission lines and a collimated large-scale jet along the observer's line of sight. An X-ray spectral flattening has been ...
  • CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE 
    Fu, Yuming; Wu, Xue-Bing; Li, Yifan; Pang, Yuxuan; Joshi, Ravi; Zhang, Shuo; Wang, Qiyue; Yang, Jing; Ng, FanLam; Liu, Xingjian; Qiu, Yu; Zhu, Rui; Wang, Huimei; Wolf, Christian; Zhang, Yanxia; Huo, Zhi-Ying; Ai, Y. L; Ma, Qinchun; Feng, Xiaotong; Bouwens, R. J (American Astronomical Society, 2024-04)
    A complete and pure sample of quasars with accurate redshifts is crucial for quasar studies and cosmology. In this paper, we present CatNorth, an improved Gaia Data Release 3 (Gaia DR3) quasar candidate catalog with more ...
  • The CatSouth Quasar candidate catalog for the southern sky and a unified all-sky catalog based on Gaia DR3 
    Fu, Yuming; Wu, Xue-Bing; Bouwens, R. J; Caputi, Karina I; Pang, Yuxuan; Zhu, Rui; Yang, Da-Ming; Qin, Jin; Wang, Huimei; Wolf, Christian; Li, Yifan; Joshi, Ravi; Zhang, Yanxia; Huo, Zhi-Ying; Ai, Y. L (American Astronomical Society, 2025-08)
    The Gaia DR3 has provided a large sample of more than 6.6 million quasar candidates with high completeness but low purity. Previous work on the CatNorth quasar candidate catalog has shown that including external multiband ...
  • Changing-look active galactic nuclei: a study of optical/uv and the highly ionized fe kα x-ray line flux variations using photoionization simulations 
    Adhikari, T. P; Mondal, Santanu; He, Zhicheng; Rozanska, Agata; Hryniewicz, K (American Astronomical Society, 2025-07-20)
    Significant variability in broad emission line strengths of active galactic nuclei (AGN) over months to years has been observed, often accompanied by intrinsic continuum changes. Such spectral variability challenges the ...
  • Characterizing the Optical Nature of the Blazar S5 1803+784 during Its 2020 Flare 
    Agarwal, A; Pandey, Ashwani; Ozdonmez, Aykut; Ege, Ergun; Avik, Kumar Das; Volkan, Karakulak (IOP Publishing, 2022-07-01)
    We report the results from our study of the blazar S5 1803+784 carried out using quasi-simultaneous B, V, R, and I observations from 2020 May to 2021 July on 122 nights. Our observing campaign detected a historically bright ...
  • Detection of an optical quasiperiodic oscillation in the Blazar 3C 454.3 
    Dogra, Karan; Gupta, A. C; Raiteri, C. M; Villata, M; Wiita, P. J; Valtonen, Mauri J; Kurtanidze, S. O; Jorstad, S; Bachev, R; Damljanovic, G; Lorey, C; Savchenko, S. S; Vince, O; Abdelkareem, M; Aceituno, F. J; Acosta-Pulido, J. A; Agudo, I; Andreuzzi, G; Ata, S. A; Baida, G. V; Barbieri, L; Blinov, D; Bonnoli, G; Borman, G. A; Carnerero, M. I; Carosati, D; Casanova, V; Chen, W. P; Cui, Lang; Devanand, P. U; Elhosseiny, E. G; Elsaesser, D; Escudero, J; Fan, J. H; Feige, M; Gazeas, K; Grishina, T. S; Gu, Minfeng; Hagen-Thorn, V. A; Hemrich, F; Hsiao, H. Y; Ismail, M; Ivanidze, R. Z; Jovanovic, M. D; Kamel, T. M; Kimeridze, G. N; Kishore, Shubham; Kopatskaya, E. N; Kuberek, D; Kurtanidze, O. M; Kurtenkov, A; Larionov, V. M; Larionova, Elena G; Larionova, L. V; Lin, H. C; Marchini, A; Marinelli, C; Marscher, A; Morcuende, D; Morozova, D. A; Nazarov, S. V; Nikolashvili, M. G; Reinhart, D; Otero-Santos, J; Scherbantin, A; Semkov, E; Shishkina, E. V; Sigua, L. A; Singh, Ajay Kumar; Sota, A; Steineke, R; Stojanovic, M; Strigachev, A; Takey, Ali; Tawfeek, Amira A; Tripathi, Tushar; Troitskiy, I. S; Troitskaya, Y. V; Tsai, An-Li; Vasilyev, A. A; Vrontaki, K; Zhang, Zhongli; Zhovtan, A. V; Zottmann, N; Zuo, Wenwen (American Astronomical Society, 2026-06-01)
    We analyzed 19 yr of R-band data of the blazar 3C 454.3 from the Whole Earth Blazar Telescope archive, along with new data from its members and from public archives such as those provided by the Small and Moderate Aperture ...
  • Discovery of a years-delayed radio flare from an unusually slowly evolving tidal disruption event candidate 
    Zhang, Zhumao; Shu, Xinwen; Yang, Lei; Sun, Luming; Ding, Hucheng; Yan, Lin; Jiang, Ning; An, Fangxia; Silima, Walter; Zhang, Fabao; Chandola, Yogesh; Wu, Zhongzu; Liu, Daizhong; Dou, L; Wang, Jianguo; Wang, Yibo; Yang, Chenwei; Li, Di; Zhou, Tianyao; Zhang, Wenjie; Peng, Fangkun; Wang, Tinggui (American Astronomical Society, 2026-01-20)
    SDSS J1115+0544 is a unique low-ionization nuclear emission-line region galaxy with energetic ultraviolet (UV), optical, and mid-infrared outbursts occurring in its nucleus. We present the results from an analysis of ...
  • Discovery of changing-look behavior in AGN NGC3822: A long-term multiwavelength study 
    Layek, Narendranath; Nandi, Prantik; Naik, Sachindra; Chhotaray, Birendra; Jana, Arghajit; Dash, Priyadarshee P; Neeraj, Kumari; Stalin, C. S; Bandari, Srikanth; Muneer, S (American Astronomical Society, 2025-12-01)
    We present a comprehensive long-term multiwavelength study of the active galactic nucleus NGC 3822, based on 17 yr (2008─2025) of X-ray, ultraviolet (UV), and optical observations. The data set includes observations from ...
  • Effect of the time spent by the photon in the absorbed state on the time-dependent transfer of radiation 
    Mohan Rao, D; Rangarajan, K. E; Peraiah, A (The American Astronomical Society, 1990-08)
    The time-dependent transfer equation is derived for a two-level atomic model which takes both bound-bound and bound-free transitions into account. A numerical scheme is proposed for solving the monochromatic time-dependent ...
  • Evidence for Low-power Radio Jet–ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Riffel, Rogemar A; Manna, Arijit; Pal, Sabyasachi; Dors, O. L; Wylezalek, Dominika; Paliya, Vaidehi S; Saikia, Payaswini; Dabhade, Pratik; Patig, Markus-Kissler; Sagar, R (American Astronomical Society, 2023-12-20)
    Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in ...
  • Exploring the central region of NGC 1365 in the ultraviolet domain 
    Kurian, K. S; Stalin, C. S; Wylezalek, D; Lyubenova, Mariya; Adhikari, T. P; Devaraj, A; Sagar, R; Kissler-Patig, Markus; Mondal, Santanu (American Astronomical Society, 2024-10-10)
    Active galactic nuclei (AGN) feedback and its impact on their host galaxies are critical to our understanding of galaxy evolution. Here, we present a combined analysis of new high resolution ultraviolet (UV) data from the ...
  • Identification of large-scale (>100 kpc) radio jets in narrow-line seyfert 1 galaxies 
    Umayal, S; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S; Muneer, S; Maheswar, G (American Astronomical Society, 2025-12-10)
    Powerful, large-scale relativistic jets are usually associated with massive, old elliptical galaxies. This paradigm has recently been challenged by the identification of narrow-line Seyfert 1 (NLSy1) galaxies, thought to ...
  • Kinetic Equilibria of Accretion Discs 
    Bhaskaran, P; Krishan, V (Springer, 1995-10)
    A kinetic description of the equilibrium structure of accretion disc plasma is presented. It is possible to have an equilibrium configuration for a stationary axisymmetric gravitating plasma disc with spatial gradients in ...
  • Long-Term Monitoring of Blazar PKS 0208-512: A Change of γ-Ray Baseline Activity from EGRET to Fermi Era 
    Ammenadka, Krishna Mohana; Bhattacharya, Debbijoy; Bhattacharyya, Subir; Bhatt, N; Stalin, C. S (Multidisciplinary Digital Publishing Institute, 2022-10)
    The blazar PKS 0208-512 was in the lowest 𝛾 -ray brightness state during the initial 10 years of observations with the Fermi Gamma-ray Space Telescope (Fermi), which was an order of magnitude lower than its flux state ...
  • The modulation of radiation in an electron-positron plasma 
    Gangadhara, R. T; Krishan, V; Shukla, P. K (Royal Astronomical Society, 1993-05-01)
    The modulational instability of a large-amplitude, linearly polarized electromagnetic wave propagating in an electron-positron plasma is considered, including the combined effect of relativistic mass variation of the plasma ...
  • NGC 7314: X-ray study of the evolving accretion properties 
    Chatterjee, Debjit; Jana, Arghajit; Mangalam, A; Chang, Hsiang-Kuang (American Astronomical Society, 2024-11-20)
    We present a comprehensive analysis of the timing and spectral properties of NGC 7314, a Seyfert 1.9 galaxy, using X-ray observations from XMM-Newton, NuSTAR, and RXTE/proportional counter array (PCA). The timing analysis ...
  • On the properties of X-Ray corona in Seyfert 1 galaxies 
    Pal, Indrani; Anju, A; Sreehari, H; Rameshan, Gitika; Stalin, C. S; Ricci, Claudio; Marchesi, S (American Astronomical Society, 2024-11-20)
    We carried out a uniform and systematic analysis of a sample of 112 nearby bright Seyfert 1 type active galactic nuclei, the observations of which were carried out by the Nuclear Spectroscopic Telescope Array between 2013 ...

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