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Browsing IIAP Publications by Subject "Accretion"

Browsing IIAP Publications by Subject "Accretion"

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  • The 1995-96 decline of R Coronae Borealis: high-resolution optical spectroscopy 
    Kameswara Rao, N; Lambert, D. L; Adams, M. T; Doss, D. R; Gonzalez, G; Hatzes, A. P; James, C. R; Johns-Krull, C. M; Luck, R. E; Pandey, G; Reinsch, K; Tomkin, J; Woolf, V. M (The Royal Astronomical Society, 1999-12)
    A set of high-resolution optical spectra of R CrB acquired before, during and after its 1995-96 decline is discussed. All of the components reported from earlier declines are seen. This novel data set provides new information ...
  • 2.5-dimensional solution of the advective accretion disk: a self-similar approach 
    Ghosh, S; Mukhopadhyay, B (Institute of Physics, 2009-02)
    We provide a 2.5-dimensional solution to a complete set of viscous hydrodynamical equations describing accretion-induced outflows and plausible jets around black holes/compact objects. We prescribe a self-consistent advective ...
  • Accretion and wind dynamics in tidal disruption events 
    Mageshwaran, T; Mangalam, A (International Astronomical Union, 2017-06)
    We have constructed self similar models of time dependent and non relativistic ac- cretion disks in both sub and super-Eddington phase of TDEs with wind outflows for a general viscosity prescription which is a function ...
  • Accretion flow properties of GRS 1915+105 during Its θ class using AstroSat data 
    Banerjee, Anuvab; Bhattacharjee, Ayan; Chatterjee, Debjit; Debnath, Dipak; Chakrabarti, S. K; Katoch, Tilak; Antia, H. M (IOP Publishing, 2021-08-01)
    The Galactic microquasar GRS 1915+105 shows rich variability that is categorized into different classes. In this paper, we report the temporal and spectral analysis of GRS 1915+105 to study the properties of the accretion ...
  • Accretion properties of MAXI J1813-095 during its failed outburst in 2018 
    Jana, Arghajit; Jaisawal, G. K; Naik, Sachindra; Neeraj Kumari; Chatterjee, Debjit; Chatterje, Kaushik; Bhowmick, Riya; Chakrabarti, S. K; Chang, H.-K; Debnath, Dipak (IOP Publishing, 2021-05)
    We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813–095 using Swift, NICER, and NuSTAR observations during its 2018 outburst. The timing behavior of the source is ...
  • Accretion properties of soft X-Ray transient XTE J1856+053 during its 2023 outburst 
    Chatterjee, Debjit; Jana, A; Chang, Hsiang-Kuang (The American Astronomical Society, 2024-09-01)
    Soft X-ray transients (SXTs) are a subclass of the low-mass X-ray binaries that occasionally show a sudden rise in their soft X-ray luminosity; otherwise, they remain in an extremely faint state. We investigate the accretion ...
  • Accurate sticking coefficient calculation for carbonaceous dust growth through accretion and desorption in astrophysical environments 
    Bossion, D; Sarangi, A; Aalto, S; Esmerian, C; Hashemi, S. R; Knudsen, K. K; Vlemmings, W; Nyman, G (EDP Sciences, 2024-12)
    Context. Cosmic dust is ubiquitous in astrophysical environments, where it significantly influences the chemistry and the spectra. Dust grains are likely to grow through the accretion of atoms and molecules from the gas-phase ...
  • Anomalous nature of outbursts of black hole candidate 4U 1630-472 
    Chatterjee, Kaushik; Debnath, Dipak; Bhowmick, Riya; Nath, Sujoy Kumar; Chatterjee, Debjit (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    The Galactic black hole candidate (BHC) 4U 1630−472 has gone through several outbursts (13 to be particular) in the last two and a half decades starting from the RXTE era till date. Like the outbursts of other transient ...
  • AstroSat view of GRS 1915+105 during the soft state: detection of HFQPOs and estimation of mass and spin 
    Sreehari, H; Nandi, Anuj; Das, Santabrata; Agrawal, V. K; Mandal, Samir; Ramadevi, M. C; Katoch, Tilak (Oxford University Press on behalf of the Royal Astronomical Society, 2020-12)
    We report the results of AstroSat observations of GRS 1915+105 obtained using 100 ks Guaranteed Time during the soft state. The colour–colour diagram indicates a variability class of δ with the detection of high-frequency ...
  • Broadband X-Ray Spectral Analysis of the ULX NGC 1313 X-1 Using JeTCAF: Origin of the ULX Bubble 
    Palit, Biswaraj; Mondal, Santanu (IOP Publishing, 2023-05)
    NGC 1313 X-1 is a mysterious ultraluminous X-ray (ULX) source whose X-ray-powering mechanism and bubblelike structure surrounding the source are topics of intense study. Here, we perform an X-ray spectroscopic study of the ...
  • Correlated X-ray timing and spectral behavior in GX 349+2 
    Agrawal, V. K; Bhattacharyya, S (The European Southern Observatory, 2003-01)
    We present a detailed and systematic investigation of correlated spectral and timing properties of the Z source GX 349+2, using extensive data ( ~ 221 ks) obtained from the Proportional-Counter-Array on-board RXTE satellite, ...
  • Cosmic Spin and Mass Evolution of Black Holes and Its Impact 
    Bhattacharyya, Dipanweeta; Mangalam, A (IOP Publishing, 2020-06-01)
    We build an evolution model of the central black hole that depends on the processes of gas accretion, the capture of stars, mergers, and electromagnetic torque. In the case of gas accretion in the presence of cooling ...
  • Detection of the Fe K lines from the binary AGN in 4C+37.11 
    Mondal, Santanu; Mousumi Das; Rubinur, K; Bansal, Karishma; Nath, Aniket; Taylor, G. B (EDP Sciences, 2024-11)
    We report the discovery of the Fe K line emission at ∼6.62−0.06+0.06 keV with a width of ∼0.19−0.05+0.05 keV using two epochs of Chandra archival data for the nucleus of the galaxy 4C+37.11, which is known to host a binary ...
  • Discovery of soft and hard X-ray time lags in low-mass AGNs 
    Mallick, L; Wilkins, D. R; Alston, W. N; Markowitz, A; Marco, B. De; Parker, M. L; Lohfink, A. M; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2021-05)
    The scaling relations between the black hole (BH) mass and soft lag properties for both active galactic nuclei (AGNs) and BH X-ray binaries (BHXRBs) suggest the same underlying physical mechanism at work in accreting BH ...
  • Effect of beam-plasma instabilities on accretion disk flares 
    Krishan, V; Wiita, P. J; Ramadurai, S (European Southern Observatory, 2000-04)
    We show that a certain class of flare models for variability from accretion disk coronae are subject to beam-plasma instabilities. These instabilities can prevent significant direct acceleration and greatly reduce the ...
  • Emission lines from X-ray illuminated accretion disc in black hole binaries 
    Mondal, Santanu; Adhikari, Tek P; Singh, Chandra B (Oxford University Press on behalf of the Royal Astronomical Society, 2021-07)
    X-ray flux from the inner hot region around central compact object in a binary system illuminates the upper surface of an accretion disc and it behaves like a corona. This region can be photoionized by the illuminating ...
  • The enigmatic double-peaked stripped-envelope SN 2023aew 
    Kangas, T; Kuncarayakti, H; Nagao, T; Kotak, R; Kankare, E; Fraser, M; Stevance, H; Mattila, S; Maeda, K; Stritzinger, M; Lundqvist, P; Elias-Rosa, N; Ferrari, L; Folatelli, G; Frohmaier, C; Galbany, L; Kawabata, M; Koutsiona, E; Muller-Bravo, T. E; Piscarreta, L; Pursiainen, M; Singh, A; Taguchi, K; Teja, R. S; Valerin, G; Pastorello, A; Benetti, S; Cai, Y. Z; Charalampopoulos, P; Gutierrez, C. P; Kravtsov, T; Reguitti, A (EDP Sciences, 2024-09)
    We present optical and near-infrared photometry and spectroscopy of SN 2023aew and our findings on its remarkable properties. This event, initially resembling a Type IIb supernova (SN), rebrightens dramatically ∼90 d after ...
  • Exploring the Archives: A Search for Novae in UVIT Snapshots of M31 
    Basu, Judhajeet; Krishnendu, S; Barway, Sudhanshu; Chamoli, Shatakshi; Anupama, G. C (American Astronomical Society, 2024-08-10)
    Extensive multiwavelength studies of novae have been carried out in our galaxy and in M31 for decades. However, UV studies of extragalactic novae are limited, especially those in quiescence. For the first time, we present ...
  • Exploring the disc-jet scenario in 3C 273 using simultaneous XMM-Newton and NuSTAR observations 
    Pandey, Ashwani; Mondal, Santanu; Wiita, Paul J (EDP Sciences, 2025-03)
    Context. The well-studied active galactic nucleus (AGN) 3C 273 displays characteristics of both jetted-AGNs and Seyfert galaxies, which makes it an excellent source to study the disc-jet connection in AGNs. Aims. We aim ...
  • Flux and spectral variability of Mrk 421 during its moderate activity state using NuSTAR: Possible accretion disc contribution? 
    Mondal, S; Priyanka Rani; Stalin, C. S; Chakrabarti, S. K; Rakshit, S (EDP Sciences, 2022-07)
    Context. The X-ray emission in BL Lac objects is believed to be dominated by synchrotron emission from their relativistic jets. However, when the jet emission is not strong, one could expect signatures of X-ray emission ...

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