IIA Institutional Repository: Recent submissions

  • Confronting physics of the early universe with cosmological observations 
    Joby, P. K (Indian Institute of Astrophysics, 2019-01)
    The Cosmic Microwave Background (CMB) is the oldest light in the Universe and gives us access to a picture of the Universe when it was only ≈ 300,000 years old. The CMB radiation consists of photons free streaming to us ...
  • Ultra violet space instrumentation and studies of astronomical objects 
    Mathew, Joice (Indian Institute of Astrophysics, 2018-06)
    The Ultraviolet (UV) domain plays an important role in studying transient events, the atmosphere of stars and planets, characteristics of the interstellar medium, young stellar populations, physical properties of galaxies ...
  • Development of a broadband radio spectropolarimeter for solar observations 
    Kishore, P (Indian Institute of Astrophysics, 2016-08)
    Energetic emission from the Sun can be divided into two broad categories, viz. gradual and impulsive. It is inferred from white-light observations that the first group is associated with mass ejections from the solar ...
  • Physics of tidal disruption events around black holes 
    Mageshwaran, T (Indian Institute of Astrophysics, 2017-11)
    A nearly self contained and detailed introduction to TDE physics with novel aspects and a summary of observations is provided. We have constructed a dynamical model of tidal disruption events (TDEs) that includes physical ...
  • Magnetic helicity and force-free properties of astrophysical magnetic fields 
    Prasad, Avijeet (Indian Institute of Astrophysics, 2015-05)
    Magnetic fields are ubiquitous in the universe and play an important role in variety of astrophysical phenomenon. It is thus very important to understand the origin, structure and strength of these astrophysical magnetic ...
  • Theoretical studies of ultracold atoms in optical lattices and superlattices 
    Manpreet Singh (Indian Institute of Astrophysics, 2015-04)
    The study of ultracold atoms is one of the frontier research areas of modern physics. The ability to control precisely the interactions between the ultracold atoms in optical lattices has led to the prediction and in ...
  • Design of digital receivers for low frequency radio astronomy 
    Mugundhan, V (Indian Institute of Astrophysics, 2018-10)
    Low frequency radio observations of the solar corona provide valuable information on the heliocentric distance range ≈ 1.1R - 3R , which is relatively difficult to observe from other wavelengths. These observations are ...
  • Study of small-scale features observed in solar atmosphere 
    Narang, Nancy (Indian Institute of Astrophysics, 2019-07)
    The solar atmosphere is populated with various small-scale features which are observed to be very dynamic and highly structured. The advent of modern instruments with high spatial, spectral and temporal resolution, have ...
  • Development of a spatial heterodyne spectrometer and associated instrumentation for space and ground observatories 
    Nirmal, K (Indian Institute of Astrophysics, 2018-09)
    We describe the development of compact, lightweight payloads suitable for ground, space, and balloon-based observatories. The first instrument is a compact high resolution (≥ 20000) tunable spatial heterodyne spectrom- eter ...
  • Design and development of multilayer x-ray optics 
    Panini, Singam Srikanth (Indian Institute of Astrophysics, 2019-03)
    The recent progress in the development of multilayer mirrors has revolutionized the field of astronomical X-rays optics. A variety of multilayer mirrors are now being developed for several unique applications such as ...
  • Fine- scale magnetic features in the solar atmosphere 
    Chitta, Lakshmi Pradeep (Indian Institute of Astrophysics, 2014-06)
    The surface of the Sun and solar-type stars is permeated by magnetic fields with a va- riety of spatial and temporal scales. The spatial scales range from sub-arcsec tangled fields that are yet to be observed (inaccessible ...
  • Models for observational signatures of black holes 
    Mohan, Prashanth (Indian Institute of Astrophysics, 2013-09)
  • Temporal and spectral characteristics of active galactic nuclei in X-rays using NuSTAR 
    Priyanka Rani (Indian Institute of Astrophysics, 2019-02)
    Flux variability is one of the defining characteristics of active galactic nuclei (AGN). This has been known over the past six decades ever since the discov- ery of quasars in 1963. Since then AGN have been observed ...
  • Determination of polarimetric capabilities of astronomical telescopes 
    Ramya, M. Anche (Indian Institute of Astrophysics, 2019-02)
    Polarimetric observations of celestial objects reveal information regarding magnetic field, scattered dust and planetary atmosphere. The degree of po- larization, which is of interest to astronomers, ranges from ...
  • A Radio and ultraviolet study of dual nuclei in galaxies 
    Rubinur, K (Indian Institute of Astrophysics, 2019-04)
    This thesis is aimed at studying dual nuclei in galaxies using radio and UV observations. Dual nuclei are formed during galaxy mergers in our Universe. Since we know that almost all nearby galaxies host a super-massive ...
  • Study of evolution of magnetic inhomogeneity on the sun using narrow band Imaging 
    Sajal Kumar Dhara (Indian Institute of Astrophysics, 2015-08)
    The solar atmosphere is structured by the evolving magnetic fields. These structures occur on different spatial scales. On small scale - bright points with thin boundaries have been observed. On large spatial scale - ...
  • Twisted magnetic fluxtubes in the sun 
    Sen, Samrat (Indian Institute of Astrophysics, 2020-01)
    The study of magnetic fluxtubes is a very important aspect as it plays an important role in several astrophysical phenomena in the solar atmosphere. Thus, it is very important to understand the properties and structures ...
  • Development of UV Astronomical Instruments for Balloon and Space Payloads 
    Sarpotdar, Mayuresh N (Indian Institute of Astrophysics, 2018-10)
    At Indian Institute of Astrophysics, we conduct high altitude balloon ex- periments for atmospheric and astronomical observations in UV wavelength range. To carry out observations of astronomical sources, a fine pointing ...
  • Observational studies of low redshift supernovae 
    Srivastav, S (Indian Institute of Astrophysics, 2017-02)
    Supernovae (SNe) are explosive transient events that mark the end stage of stellar evolution. This work presents a study of low redshift, hydrogen deficient (Type I) SNe, with emphasis on SNe of type Ia. The data were ...
  • Multiwavelength study of old open clusters: NGC 188 and M67 
    Sindhu, N (Indian Institute of Astrophysics, 2019-08)
    The thesis focuses on understanding the single and binary stellar evolution in the old open clusters, M67 and NGC 188 using multiwavelength photometric data. We have used images from the Ultra-Violet Imaging Telescope ...

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