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Browsing by Author "Mousumi Das"

Browsing by Author "Mousumi Das"

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  • 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 ...
  • Automated detection of double nuclei galaxies using GOTHIC and the discovery of a large sample of dual AGN 
    Bhattacharya, Anwesh; Nehal, C. P; Mousumi Das; Paswan, Abhishek; Saha, Snehanshu; Combes, Françoise (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    We present a novel algorithm to detect double nuclei galaxies (DNG) called GOTHIC (Graph-bOosTed iterated HIll Climbing) – that detects whether a given image of a galaxy has two or more closely separated nuclei. Our aim ...
  • Bulge-Disk Evolution in Interacting Bulgeless Galaxies 
    Mousumi Das; Ramya, S; Sengupta, C; Mishra, K (Astronomical Society of the Pacific, 2013-10)
    Bulgeless galaxies are an extreme class of late type spiral galaxies that have practically no bulge and are nearly pure disk in morphology. Their lack of evolution is a puzzle for theories of galaxy formation and the secular ...
  • Can bars erode cuspy halos? 
    Kataria, Sandeep Kumar; Mousumi Das (Cambridge University Press, 2019-06)
    One of the major and widely known small scale problem with the Lambda CDM model of cosmology is the “core-cusp” problem. In this study we investigate whether this problem can be resolved using bar instabilities. We see ...
  • A candidate dual AGN in a double-peaked emission-line galaxy with precessing radio jets 
    Rubinur, K; Mousumi Das; Kharb, P; Honey, M (Oxford University Press on behalf of the Royal Astronomical Society, 2017-03)
    We present high-resolution radio continuum observations with the Karl G. Jansky very large array at 6, 8.5, 11.5 and 15 GHz of the double-peaked emission-line galaxy 2MASXJ12032061+1319316. The radio emission has a prominent ...
  • Comparing the inner and outer star-forming complexes in the nearby spiral galaxies NGC 628, NGC 5457, and NGC 6946 using UVIT observations 
    Yadav, Jyoti; Mousumi Das; Patra, Narendra Nath; Dwarakanath, K. S; Rahna, P. T; McGaugh, S. S; Schomber, James; Murthy, J (IOP Publishing, 2021-06-10)
    We present a far-UV (FUV) study of the star-forming complexes (SFCs) in three nearby galaxies using the Ultraviolet Imaging Telescope. The galaxies are close to face-on and show significant outer disk star formation. Two ...
  • A comparison of the UV and HI properties of the extended UV (XUV) disk galaxies NGC 2541, NGC 5832 and ESO406-042 
    Mousumi Das; Yadav, J; Patra, N; Dwarakanath, K. S; McGaugh, S. S; Schombert, J; Rahna, P. T; Murthy, J (Indian Academy of Sciences, 2021-10)
    We present a UV study of 3 extended UV (XUV) galaxies that we have observed with the UVIT and the GMRT. XUV galaxies show filamentary or diffuse star formation well beyond their optical disks, in regions where the disk ...
  • Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope 
    Biswas, Sayan; Bhattacharjee, P; Majumdar, P; Das, Subinoy; Mousumi Das; Joarder, P. S (IOP Publishing, 2017-11)
    Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ -ray emission that could originate from the pair- annihilation ...
  • A curved 150 pc long jet in the double-peaked emission-line AGN KISSR 434 
    Kharb, P; Vaddi, Sravani; Sebastian, B; Subramanian, S; Mousumi Das; Paragi, Z (IOP Publishing, 2019-02-01)
    Double-peaked emission lines in the narrow- and/or broad-line spectra of active galactic nuclei (AGNs) have been suggested to arise as a result of disky broad/narrow-line regions, jet–medium interaction, or the presence ...
  • Detection of molecular gas in void galaxies: implications for star formation in isolated environments 
    Mousumi Das; Saito, T; Iono, D; Honey, M; Ramya, S (IOP Publishing, 2015-12-10)
    We present the detection of molecular gas from galaxies located in nearby voids using the CO(1–0) line emission as a tracer. The observations were performed using the 45 m single dish radio telescope of the Nobeyama Radio ...
  • Double-peaked Emission Lines Due to a Radio Outflow in KISSR 1219 
    Kharb, P; Subramanian, S; Vaddi, Sravani; Mousumi Das; Paragi, Z (IOP Publishing, 2017-09)
    We present the results from 1.5 and 5 GHz phase-referenced VLBA and 1.5 GHz Karl G. Jansky Very Large Array (VLA) observations of the Seyfert 2 galaxy KISSR 1219, which exhibits double-peaked emission lines in its optical ...
  • Dual Active Galactic Nuclei in Nearby Galaxies 
    Mousumi Das; Rubinur, K; Preethi, K; Varghese, A; Novakkuni, N; James, A (Societe Royale des Sciences de Liege, 2018-04)
    Galaxy mergers play a crucial role in the formation of massive galaxies and the buildup of their bulges. An important aspect of the merging process is the in-spiral of the supermassive black-holes (SMBHs) to the centre ...
  • The Effect of Bulge Mass on Bar Pattern Speed in Disk Galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (IOP Publishing, 2019-11)
    We present a study of the effect of bulge mass on the evolution of bar pattern speed in isolated disk galaxies using N -body simulations. Earlier studies have shown that disk stars at the inner resonances can transfer a ...
  • 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 ...
  • Estimating the Oblateness of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion 
    Mousumi Das; Ianjamasimanana, Roger; McGaugh, Stacy S; Schombert, James; Dwarakanath, K. S (American Astronomical Society, 2023-03-20)
    We derive the oblateness parameter q of the dark matter halo of a sample of gas-rich, face-on disk galaxies. We have assumed that the halos are triaxial in shape but their axes in the disk plane (a and b) are equal, so ...
  • The evolution of bulges of galaxies in minor fly-by interactions 
    Kumar, A; Mousumi Das; Kataria, Sandeep Kumar (Cambridge University Press, 2019-06)
    We investigate the minor interactions of two disk galaxies with mass ratio of 10:1 in fly-by encounters that do not lead to the merging of the galaxies. In our N-body simulations, we vary only the pericenter distances to ...
  • 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 ...
  • The extended H i disk and star formation in the dwarf spiral galaxy NGC 4701 
    Mousumi Das; Sengupta, C; Honey, M (IOP Publishing, 2019-02-01)
    We present H i, optical, and near-infrared observations of the nearby bulgeless, dwarf spiral galaxy NGC 4701. The galaxy lies on the Virgo filament and is one of the most gas-rich dwarfs in our local environment. Our aim ...
  • From nearby low luminosity AGN to High Redshift Radio Galaxies: science interests with square kilometre array 
    Kharb, P; Lal, D. V; Singh, V; Bagchi, J; Ishwara-Chandra, C. H; Hota, A; Konar, C; Wadadekar, Yogesh; Shastri, P; Mousumi Das; Baliyan, K; Nath, B. B; M. Pandey-Pommier (Springer, 2016-12)
    We present detailed science cases that a large fraction of the Indian AGN community is interested in pursuing with the upcoming Square Kilometre Array (SKA). These interests range from understanding low luminosity active ...
  • 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 ...

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