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Browsing by Subject "Galaxies: kinematics and dynamics"

Browsing by Subject "Galaxies: kinematics and dynamics"

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  • The AGN and gas disk in the low surface brightness galaxy PGC045080 
    Das, M; Kantharia, N; Ramya, S; Prabhu, T. P; McGaugh, S. S; Vogel, S. N (Blackwell Publishing, 2007-07)
    We present radio observations and optical spectroscopy of the giant low surface brightness (LSB) galaxy PGC 045080 (or 1300+0144). PGC 045080 is a moderately distant galaxy having a highly inclined optical disc and massive ...
  • Dynamical interplay of disc thickness and interstellar gas: Implication for the longevity of spiral density waves 
    Ghosh, S; Jog, Chanda J (EDP Sciences, 2022-02)
    A typical galactic disc has a finite thickness. In addition to stars, it also contains a finite amount of interstellar gas. Here, we investigate the physical impact of the finite thickness of a galactic disc on the disc ...
  • Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions 
    Kumar, Ankit; Ghosh, Soumavo; Kataria, Sandeep Kumar; Mousumi Das; Debattista, Victor P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    It is now clear that the stars in the Solar neighbourhood display large-scale coherent vertical breathing motions. At the same time, Milky Way-like galaxies experience tidal interactions with satellites/companions during ...
  • H I 21cm observations and dynamical modelling of the thinnest galaxy: FGC 2366 
    Aditya, K; Banerjee, Arunima; Kamphuis, Peter; Mosenkov, Aleksandr; Makarov, Dmitry; Borisov, Sviatoslav (Oxford University Press on behalf of Royal Astronomical Society, 2023-11)
    Superthin galaxies are bulgeless low-surface brightness galaxies with unusually high major-to-minor axes ratio of the stellar disc, i.e. 10 < a/b < 20. We present Giant Metrewave Radio Telescope (GMRT) H I 21cm radio-synthesis ...
  • H I kinematics of the Large Magellanic Cloud revisited: Evidence of possible infall and outflow 
    Indu, G; Subramaniam, A (EDP Sciences, 2015-01)
    Aims. The neutral atomic Hydrogen (H I) kinematics of the Large Magellanic Cloud (LMC) is revisited in light of two new proper motion estimates. Methods. We analysed the intensity weighted H I velocity maps of the Australia ...
  • Kinematics and Excitation of the Nuclear Spiral in the Active Galaxy Arp 102B 
    Couto, G. S; Storchi-Bergmann, T; Axon, D. J; Robinson, A; Kharb, P; Riffel, R. A (Oxford University Press on behalf of the Royal Astronomical Society, 2013-11-11)
    We present a two-dimensional analysis of the gaseous excitation and kinematics of the inner 2.5 × 1.7 kpc2 of the low-ionization nuclear emission-line region (LINER)/Seyfert 1 galaxy Arp 102B, from optical spectra obtained ...
  • 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 ...
  • The recent star-formation history of the Large and Small Magellanic Clouds 
    Indu, G; Subramaniam, A (EDP Sciences, 2011-11)
    Aims. Recent interactions between the Large and the Small Magellanic Clouds (LMC and SMC) and the Milky Way can be understood by studying their recent star formation history. This study aims to detect any directional or ...
  • Red giants in the Small Magellanic Cloud – I. Disc and tidal stream kinematics 
    Dobbie, P. D; Cole, A. A; Subramaniam, A; Keller, S (Oxford University Press on behalf of the Royal Astronomical Society, 2014-08-01)
    We present results from an extensive spectroscopic survey of field stars in the Small Magellanic Cloud (SMC). 3037 sources, predominantly first-ascent red giants, spread across roughly 37.5 deg2, are analysed. The line-of-sight ...
  • Stellar and gas dynamical model for tidal disruption events in a quiescent galaxy 
    Mageshwaran, T; Mangalam, A (IOP Publishing, 2015-12-01)
    A detailed model of the tidal disruption events (TDEs) has been constructed using stellar dynamical and gas dynamical inputs that include black hole (BH) mass M•, specific orbital energy E and angular momentum J, star mass ...
  • 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 ...
  • Unravelling the post-collision properties of the Cartwheel galaxy: A MUSE exploration of its bar and inner region 
    Mondal, Chayan; Barway, Sudhanshu (EDP Sciences, 2024-01)
    Aims. We aim to investigate the characteristics of the bar and inner disc in the collisional ring galaxy Cartwheel. Methods. We used integral field unit (IFU) observations from the Multi-Unit Spectroscopic Explorer (MUSE) ...
  • Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7 
    Hampton, E. J; Medling, A. M; Groves, B; Kewley, L; Dopita, M; Davies, R; Ho, I-Ting; Kaasinen, M; Leslie, S; Sharp, R; Sweet, S. M; Thomas, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2017-09)
    Integral field spectroscopy (IFS) surveys are changing how we study galaxies and are creating vastly more spectroscopic data available than before. The large number of resulting spectra makes visual inspection of emission ...

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