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Browsing IIAP Publications by Subject "Galaxies"

Browsing IIAP Publications by Subject "Galaxies"

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  • The ALMaQUEST Survey. VII. Star Formation Scaling Relations of Green Valley Galaxies 
    Lin, Lihwai; Ellison, Sara L; Pan, Hsi-An; Thorp, Mallory D; Yu, Po-Chieh; Belfiore, Francesco; Hsieh, Bau-Ching; Maiolino, Roberto; Ramya, S; Sanchez, Sebastian F; Su, Yung-Chau (American Astronomical Society, 2022-02-20)
    We utilize the ALMA-MaNGA QUEnch and STar formation (ALMaQUEST) survey to investigate the kpc-scale scaling relations, presented as the resolved star-forming MS (rSFMS: ΣSFR versus Σ*), the resolved Schmidt–Kennicutt ...
  • AstroSat/UVIT Study of the Diffuse Ultraviolet Radiation in the Dwarf Galaxy Holmberg II 
    Bordoloi, Olag Pratim; Ananthamoorthy, B; Shalima, P; Safonova, M; Bhattacharya, Debbijoy; Shchekinov, Yuri A; Gogoi, Rupjyoti (IOP Publishing, 2024-07)
    We present measurements of diffuse ultraviolet (UV) emission in the dwarf irregular galaxy Holmberg II obtained with the Ultra Violet Imaging Telescope (UVIT) instrument onboard AstroSat, India's first multiwavelength space ...
  • Central regions of Sersic-Pastoriza galaxies - A photographic study 
    Prabhu, T. P (Indian Academy of Sciences, 1980-12)
    A classification scheme is proposed for the central regions of Sérsic-Pastoriza galaxies based on high resolution photographs of 50 objects in the integrated light (4000 Å-8700 Å). Structures of two different linear scales ...
  • Clustering of Galaxies by the Alpha-Effect 
    Krishan, V (Royal Astronomical Society, 1993-09-01)
    The development of large-scale flows from the stresses generated by small-scale flows in a Navier-Stokes system is studied in order to model the large-scale structure of the Universe. This process is an analogue of the ...
  • 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 ...
  • The completed SDSS-IV extended baryon oscillation spectroscopic survey: BAO and RSD measurements from the anisotropic power spectrum of the quasar sample between redshift 0.8 and 2.2 
    Neveux, Richard; Burtin, Etienne; Mattia, Arnaud de; Smith, Alex; Ross, Ashley J; Hou, Jiamin; Bautista, Julian; Brinkmann, Jonathan; Chuang, Chia-Hsun; Dawson, Kyle S; Gil-Marin, Hector; Lyke, Brad W; Macorra, Axel de la; Bourboux, Helion du Mas des; Mohammad, Faizan G; Muller, Eva-Maria; Myers, Adam D; Newman, Jeffrey A; Percival, Will J; Rossi, Graziano; Schneider, Donald; Vivek, M; Zarrouk, Pauline; Zhao, Cheng; Zhao, Gong-Bo (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We measure the clustering of quasars of the final data release (DR16) of eBOSS. The sample contains 343708 quasars between redshifts 0.8 ≤ z ≤ 2.2 over 4699deg2⁠. We calculate the Legendre multipoles (0,2,4) of the anisotropic ...
  • Detection of IMBHs from microlensing in globular clusters 
    Safonova, M; Rahvar, S; Bond, I; Hearnshaw, J; Stalin, C. S (American Institute of Physics, 2008-10)
    Globular clusters have been long predicted to host intermediate-mass black holes (IMBHs) in their centres. The growing evidence that some/all Galactic globular clusters (GCs) could harbour middle range (10/sup2-10/sup4 ...
  • 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 ...
  • Dynamics of ejection from galaxies and the variable mass hypothesis 
    Narlikar, J. V; Vishwakarma, R. G; Banerjee, S. K; Das, P. K; Arp, H. C; Sato, K (World Scientific Publishing Company, 2002)
    Increasing numbers of active galaxies with significant alignments of quasars are being observed. It is the purpose of this paper to explore ejection dynamics of these quasars using the variable mass hypothesis (VMH) ...
  • Energy and angular momentum transfer in binary galaxies 
    Namboodiri, P. M. S; Kochhar, R. K (NASA, 1990-11)
    The authors numerically studied tidal effects of a massive perturber on a satellite galaxy. The model consists of a spherical satellite galaxy and a point mass perturber and the encounter is non-penetrating. A wide range ...
  • Epoch of Galaxy Formation 
    Chokshi, A (Indian Academy of Sciences, 1997-12)
    A preferred epoch for forming galaxies argues strongly in favour of a standard Big Bang cosmology with a single epoch of creation. In this paper I present a model in which there is a causal connection between AGN activity ...
  • Flat rotation curves: A result of the helical inverse cascade in turbulent media? 
    Prabhu, R. D; Krishan, V (The American Physical Society, 1994-06)
    We have modeled the rotation curves of 21 galaxies observed by Amram et al. (1992), by combining the effects of rigid rotation, gravity, and turbulence. The main motivation behind such modeling is to study the formation ...
  • Giant Low Surface Brightness Galaxies 
    Mishra, A; Kantharia, N. G; Mousumi Das; Nimisha, G (Bulletin de la Societe Royale des Sciences de Liege, 2018-04)
    In this paper, we present radio observations of the giant low surface brightness (LSB) galaxies made using the Giant Metrewave Radio Telescope (GMRT). LSB galaxies are generally large, dark matter dominated spirals that ...
  • Identification of infrared sources in the IRAS circulars 
    Seal, P (Kluwer Academic Publishers, 1985-07)
    From IRAS (Infrared Astronomical Satellite) Circulars Nos. 4 to 15, 110 infrared sources have been identified. Out of these 110 identified sources 99 are galaxies, nine are nebulae, one is a dark object, and one is a ...
  • Integrated photometric characteristics of galactic open star clusters 
    Lata, S; Pandey, A. K; Sagar, R; Mohan, V (E D P Sciences, 2002-06)
    Integrated UBVRI photometric parameters of 140 galactic open clusters have been computed. Integrated I(V-R)0 and I(V-I)0 colours as well as integrated parameters for 71 star clusters have been obtained for the first time. ...
  • Mildly Active Nuclei of Galaxies 
    Prabhu, T. P (Indian Academy of Sciences, 1985)
    Milder forms of activity in the nuclear regions of galaxies are reviewed. Three classes of activity are identified, namely starbursts, high-excitation emission-line and low-ionization emission-line nuclei. Sérsic perinuclear ...
  • Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies 
    Lal, D. V; Shastri, P; Gabuzda, D. C (EDP Sciences, 2004-10)
    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5 GHz (wavelength, lamda = 6 cm). The Seyferts of the two types were chosen to be ...
  • Modern astronomy : startling facts 
    Sivaram, C; Arun, K (Ane Books, 2009)
    The year 2009 is being recognised as the international year of astronomy (IYA) to mark the four hundredth anniversary of the historical occasion in the year 1609 when Galileo Galilei used the then newly invented telescope ...
  • Mond, dark matter and the cosmological constant 
    Sivaram, C (Springer, 1994-09)
    A possible connection between MOND (Modification of Newtonian Dynamics) proposed as an alternative hypothesis to dark matter in galaxies and clusters and a residual cosmological constant term dominating cosmological dynamics ...
  • Near-Infrared and Optical Morphology of the Dusty Galaxy NGC 972 
    Mayya, Y. D; Ravindranath, S; Carrasco, L (The American astronomical Society, 1998-10)
    Near-infrared (NIR) and optical surface photometric analyses of the dusty galaxy NGC 972 are presented. The photometric profiles in the BVRJHK bands can be fitted with a combination of Gaussian and exponential profiles, ...

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