Browsing Physics (PHY) by Subject "Astronomy"
Now showing items 1-19 of 19
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Chemical Composition Of Selected Metal Poor Stars
(2011-08-04) -
Dynamics of Warps and Lopsidedness in Spiral Galaxies
(2018-07-28) -
Investigating Systematics In The Cosmological Data And Possible Departures From Cosmological Principle
(2013-06-11)This thesis contributes to the field of dark energy and observational cosmology. We have investigated possible direction dependent systematic signal and non-Gaussian features in the supernovae (SNe) Type Ia data. To detect ... -
Observational Aspects Of Core Collapse Supernovae
(2013-10-17)The discovery of several bright supernovae (SNe) in recent years has evoked a great deal of interest in these objects. The study of these objects are of importance not only as probes to the end stages of stellar evolution, ... -
On the Nature Of Propagating MHD Waves In The Solar Atmosphere
(2014-10-15)One of the most persistent problem in solar physics is the identification of the mechanism that heats the solar corona and accelerates the fast solar wind. Magneto-hydrodynamic (MHD)waves play a crucial role in heating of ... -
Orbital Evolution And Super-Orbital Flux Variations In X-ray Binary Pulsars
(2010-08-23)X-ray binaries are binary stellar systems containing a compact object and a normal companion star which are gravitationally bound and rotate about a common center of mass. The compact object accretes matter from the companion ... -
Origin Of The Extragalactic Gamma-Ray Background
(2013-10-01)It is evident that the origin of EGRB is not well established. In this thesis I examine the unresolved discrete origin of EGRB. The contribution from normal galaxies, starburst galaxies and AGNs to the EGRB is examined. ... -
The Perturbative Evolution Of Cosmological Correlations
(2013-01-09) -
Prolate Shaped Dark Matter Halo And The Galactic Warp
(2016-04-26)The physical explanation for the existence of the galactic warp is one of the major research areas in Astronomy. People have proposed various theories but nobody has yet given a convincing explanation. Most of the spiral ... -
A Radio Study Of Gas Loss Processes In Nearby Galaxies
(2008-10-17)The work in this thesis involves detailed multi-frequency radio continuum (from 325 MHz to 15 GHz) and Hi spectroscopic studies of a few represent tative nearby galaxies which are experiencing gas-loss from their disks ... -
Single Pulse Studies Of Wide Profile Drifting Pulsars - A Probe Of Pulsar Magnetospheres
(2011-02-07)The detailed nature of radio emission processes of pulsars and the exact location and distribution of the pulse emitting regions are still shrouded with mystery. Pulsars with drifting subpulses are considered as an important ... -
Studies Of Diffuse Ultraviolet Radiation
(2013-10-07)Ever since the first observations of diffuse ultraviolet radiation by Hayakawa et al. (1969) and Lillie & Witt (1976), there has been an effort to understand its distribution and its origin. Unfortunately, because of the ... -
A Study of Slow Modes in Keplerian Discs
(2018-02-25)A rich variety of discs are found orbiting massive bodies in the universe. These could be accretion discs composed of gas around stellar mass compact objects fueling micro-quasar activity; protoplanetary discs, mainly ... -
Vertical Structure Of Disk Galaxies And Their Dark Matter Halos
(2015-01-02)The topic of this thesis is the study of the vertical structure of the disk galaxies and their dark matter halos through theoretical modeling and numerical calculations. The basic theoretical model of the galactic disk ... -
Warped Galaxies : Recovery Of Pattern Speed, Velocity Field And The Warp Equation
(2015-08-04)Pattern speed is an important parameter of the density wave theory for spiral galaxies. In this thesis we have determined the pattern speed for warped galaxies (flat galaxies being a special case of this generalization) ...