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Browsing by Subject "Galaxies: structure"

Browsing by Subject "Galaxies: structure"

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  • The central region of the enigmatic Malin 1 
    Saha, Kanak; Dhiwar, Suraj; Barway, Sudhanshu; Narayan, Chaitra; Tandon, Shyam (Indian Academy of Sciences, 2021-10)
    Malin 1, being a class of giant low surface galaxies, continues to surprise us even today. The HST/F814W observation has shown that the central region of Malin 1 is more like a normal SB0/a galaxy, while the rest of the ...
  • Constrained Violent Relaxation to a Spherical Halo 
    Mangalam, A; Nityananda, R; Sridhar, S (The American Astronomical Society, 1999-10)
    Violent relaxation during the collapse of a galaxy halo is known to be incomplete in realistic cases such as cosmological infall or mergers. We adopt a physical picture of strong but short-lived interactions between potential ...
  • Correlated projected properties of triaxial mass models 
    Thakur, P; Chakraborty, D. K (Astronomical Society of India, 2001)
    Triaxial mass models producing ellipticity variations and isophote twists are investigated. The spherical mass distributions are made triaxial by adding two more terms, each consisting of a radial function muliplied by a ...
  • Disk of the small magellanic cloud as traced by cepheids 
    Subramanian, S; Subramaniam, A (EDP Sciences, 2015-01)
    Context. The structure and evolution of the disk of the Small Magellanic Cloud (SMC) are traced by studying the Cepheids. Aims. We aim to estimate the orientation measurements of the disk, such as the inclination, i, and ...
  • 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 ...
  • Evidence of a Misaligned Secondary Bar in the Large Magellanic Cloud 
    Subramaniam, A (The American Astronomical Society, 2004-03-20)
    Evidence of a misaligned secondary bar, within the primary bar of the Large Magellanic Cloud (LMC), is presented. The density distribution and the dereddened mean magnitudes ( ) of the red clump stars in the bar obtained ...
  • 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 ...
  • 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 ...
  • Near-infrared imaging of barred halo-dominated low surface brightness galaxies 
    Honey, M; Mousumi Das; Ninan, J. P; Manoj, P (Oxford University Press on behalf of the Royal Astronomical Society, 2016-10-21)
    We present a near-infrared (NIR) imaging study of barred low surface brightness (LSB) galaxies using the TIFR NIR Spectrometer and Imager. LSB galaxies are dark matter dominated, late-type spirals that have low-luminosity ...
  • Remnants of recent mergers in nearby early-type galaxies and their classification 
    Giri, Gourab; Barway, Sudhanshu; Raychaudhury, Somak (Oxford University Press on behalf of Royal Astronomical Society, 2023-04)
    We search for signatures of recent galaxy close interactions and mergers in a sample of 202 early-type galaxies in the local universe from the public SDSS Stripe82 deep images (μr ∼ 28.5 mag arcsec−2). Using two different ...
  • 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 ...
  • Shape of the outer stellar warp in the Large Magellanic Cloud disk 
    Saroon, S; Subramanian, S (EDP Sciences, 2022-10)
    Warps are vertical distortions of the stellar or gaseous disks of galaxies. One of the proposed scenarios for the formation of warps involves tidal interactions among galaxies. A recent study identified a stellar warp in ...
  • Spectral index variation across X-shaped radio galaxies 
    Patra, Dusmanta; Joshi, Ravi; Gopal-Krishna (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    The formation mechanism of the enigmatic subclass of radio galaxies, called ‘X-shaped radio galaxies’ (XRGs), or ‘winged’ radio galaxies, which account for ∼10 per cent of the radio galaxy population, can be effectively ...
  • Stability of galaxies across morphological sequence 
    Aditya, K (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We investigate the stability of nearby disc galaxies and galaxies at redshift (z) equal to 4.5. We explore the connection between the stability parameter (QRW), star formation rate (SFR), gas fraction (f Gas), and the ...
  • The structure and characteristic scales of the H I gas in galactic disks 
    Dib, Sami; Braine, Jonathan; Maheswar, G; Lara-López, Maritza A; Kravtsov, Valery V; Archana Soam; Sharma, Ekta; Zhukovska, Svitlana; Aouad, Charles; Belinchón, José Antonio; Helou, George; Li, Di (EDP Sciences, 2021-11)
    The spatial distribution of the H I gas in galactic disks holds important clues about the physical processes that shape the structure and dynamics of the interstellar medium (ISM). The structure of the ISM could be affected ...
  • Structure of the Large Magellanic Cloud from near infrared magnitudes of red clump stars 
    Subramanian, S; Subramaniam, A (EDP Sciences, 2013-04)
    Context. The structural parameters of the disk of the Large Magellanic Cloud (LMC) are estimated. Aims. We used the JH photometric data of red clump (RC) stars from the Magellanic Cloud Point Source Catalog (MCPSC) ...
  • 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 ...

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