IIA Institutional Repository

Browsing IIAP Publications by Subject "Galaxies: bulges"

Browsing IIAP Publications by Subject "Galaxies: bulges"

Sort by: Order: Results:

  • Active galactic nucleus activity and black hole masses in low surface brightness galaxies 
    Ramya, S; Prabhu, T. P; Mousumi Das (Wiley-Blackwell, 2011-12)
    We present medium resolution optical spectroscopy of a sample of nine low surface brightness (LSB) galaxies. For those that show clear signatures of active galactic nucleus (AGN) emission, we have disentangled the AGN ...
  • The effect of dark matter halo shape on bar buckling and boxy/peanut bulges 
    Ankit Kumar; Mousumi Das; Kataria, Sandeep Kumar (Oxford University Press on behalf of Royal Astronomical Society, 2022-01)
    It is well established that bars evolve significantly after they form in galaxy discs, often changing shape both in and out of the disc plane. In some cases they may bend or buckle out of the disc plane resulting in the ...
  • Galaxy flybys: evolution of the bulge, disc, and spiral arms 
    Ankit Kumar; Mousumi Das; Kataria, Sandeep Kumar (Oxford University Press on behalf of the Royal Astronomical Society, 2021-09)
    Galaxy flybys are as common as mergers in low-redshift Universe and are important for galaxy evolution as they involve the exchange of significant amounts of mass and energy. In this study, we investigate the effect of ...
  • Growth of disc-like pseudo-bulges in SDSS DR7 since z = 0.1 
    Ankit Kumar; Kataria, Sandeep Kumar (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)
    Cosmological simulations predict more classical bulges than their observational counterparts in the local Universe. Here, we quantify evolution of the bulges since z = 0.1 using photometric parameters of nearly 39 000 ...
  • Host galaxy magnitude of OJ 287 from its colours at minimum light 
    Valtonen, Mauri J; Dey, Lankeswar; Zola, S; Ciprini, S; Kidger, M; Pursimo, T; Gopakumar, A; Matsumoto, K; Sadakane, K; Caton, D. B; Nilsson, K; Komossa, S; Bagaglia, M; Baransky, A; Boumis, P; Boyd, D; Castro-Tirado, A. J; Debski, B; Drozdz, M; Perez, A. Escartin; Fiorucci, M; Garcia, F; Gazeas, K; Ghosh, S; Godunova, V; Gomez, J. L; Gredel, R; Grupe, D; Haislip, J. B; Henning, T; Hurst, G; Janík, J; Kouprianov, V. V; Lehto, H; Liakos, A; Mathur, S; Mugrauer, M; Nogues, R. Naves; Nucciarelli, G; Ogloza, W; Ojha, D. K; Pajdosz-Śmierciak, U; Pascolini, S; Poyner, G; Reichart, D. E; Rizzi, N; Roncella, F; Sahu, D. K; Sillanpää, A; Simon, A; Siwak, M; Alfaro, F. C. Soldán; Sonbas, E; Tosti, G; Vasylenko, V; Webb, J. R; Zielinski, P (Oxford University Press on behalf of Royal Astronomical Society, 2022-08)
    OJ 287 is a BL Lacertae type quasar in which the active galactic nucleus (AGN) outshines the host galaxy by an order of magnitude. The only exception to this may be at minimum light when the AGN activity is so low that ...
  • Investigating AGN black hole masses and the MBH-σe relation for low surface brightness galaxies 
    Subramanian, S; Ramya, S; Das, M; George, K; Sivarani, T; Prabhu, T. P (Oxford University Press on behalf of the Royal Astronomical Society, 2016-01)
    We present an analysis of the optical nuclear spectra from the active galactic nuclei (AGN) in a sample of low surface brightness (LSB) galaxies. Using data from the Sloan Digital Sky Survey (SDSS), we derived the virial ...
  • Investigating the AGN activity and black hole masses in low surface brightness galaxies 
    Subramanian, S; Ramya, S; Das, M; George, K; Sivarani, T; Prabhu, T. P (International Astronomical Union, 2016-02)
    We present an analysis of the optical nuclear spectra from the active galactic nuclei (AGN) in a sample of giant low surface brightness (GLSB) galaxies. GLSB galaxies are extreme late type spirals that are large, isolated ...
  • M∙ − σ relation in spherical systems 
    Bhattacharyya, D; Mangalam, A (Indian Academy of Sciences, 2018-02)
    To investigate the M∙−σ relation, we consider realistic elliptical galaxy profiles that are taken to follow a single power-law density profile given by Ï (r)=Ï 0(r/r0)−γ or the Nuker intensity profile. We calculate ...
  • A SALT spectral study of S0s hosting pseudobulges 
    Vaghmare, K; Barway, Sudhanshu; Vaisanen, Petri; Ramphul, Rajin; Wadadekar, Yogesh; Kembhavi, Ajit K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    We present a SALT-RSS spectroscopic study of a sample of S0 galaxies established by Vaghmare et al. (2015) as having pseudobulges using a combination of photometric criteria. We extract the spectra of various regions along ...
  • Star formation in bulgeless late-type galaxies: clues to their evolution 
    Mousumi Das; Sengupta, C; Ramya, S; Misra, K (Wiley-Blackwell, 2012-07)
    We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to ...
  • A study of the effect of bulges on bar formation in disc galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We use N-body simulations of bar formation in isolated galaxies to study the effect of bulge mass and bulge concentration on bar formation. Bars are global disc instabilities that evolve by transferring angular momentum ...
  • A study of the effect of bulges on bar formation in disc galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We use N-body simulations of bar formation in isolated galaxies to study the effect of bulge mass and bulge concentration on bar formation. Bars are global disc instabilities that evolve by transferring angular momentum ...
  • Why are classical bulges more common in S0 galaxies than in spiral galaxies? 
    Mishra, P. K; Wadadekar, Y; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2018-07)
    In this paper, we try to understand why the classical bulge fraction observed in S0 galaxies is significantly higher than that in spiral galaxies. We carry out a comparative study of the bulge and global properties of a ...

Search DSpace


Browse

My Account