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Browsing IIAP Publications by Subject "Astrophysics"

Browsing IIAP Publications by Subject "Astrophysics"

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  • 100 years of photon-counting: the quest for the perfect eye 
    Morel, S; Saha, S. K (Anita Publications, 2005)
  • 21st century astrophysics 
    Saha, S. K (editor); Rastogi, V. K (editor) (Anitha Publication, 2005)
    n the year 1905, Albert Einstein published four landmark papers, concerning (i) photo-electric effect for which he was awarded Nobel prize, (ii) Brownian motion, (iii) special theory of relativity that revolutionized ...
  • 3.6-m Devasthal Optical Telescope Project: Completion and first results 
    Kumar, Brijesh; Omar, A; Maheswar, G; Pandey, A. K; Sagar, R; Uddin, W; Sanwal, B. B; Bangia, T; Kumar, T. S; Yadav, S; Sahu, S; Pant, J; Reddy, B. K; Gupta, A. C; Chand, H; Pandey, J. C; Joshi, M. K; Jaiswar, M; Nanjappa, N; Purushottam; Yadav, R. K. S; Sharma, S; Pandey, S. B; Joshi, S; Joshi, Y. C; Lata, S; Mehdi, B. J; Misra, K; Singh, M (Societe Royale des Sciences de Liege, 2018-04)
    We present an update on the 3.6-m aperture optical telescope, which has been installed at Devasthal in the year 2016. In this paper, a brief overview of installation activities at site and first results are presented. The ...
  • The 4-m International Liquid Mirror Telescope 
    Surdej, J; Hickson, P; Borra, E; Swings, J; Habraken, S; Akhunov, T; Bartczak, P; Chand, H; De Becker, M; Delchambre, L; Finet, F; Kumar, B; Pandey, A; Pospieszalska, A; Pradhan, B; Sagar, R; Wertz, O; De Cat, P; Denis, S; de Ville, J; Jaiswar, M. K; Lampens, P; Nanjappa, N; Tortolani, J (Societe Royale des Sciences de Liege, 2018-04)
    The 4-m International Liquid Mirror Telescope (ILMT) is presently (March-June 2017) being erected on the ARIES site in Devasthal (Uttarakhand). We describe and illustrate in the present paper its different components. ...
  • Anomalous redshifts of quasi-stellar objects 
    Narlikar, J. V; Das, P. K (American Astronomical Society, 1980-09)
    This paper is based on the assumption that the observational evidence to date does point to the possibility that high-redshift quasars are physically associated with low-redshift galaxies. It is first argued that the excess ...
  • Application of the contour Minkowski tensor and D statistic to the Planck E -mode data 
    Joby, P. K; Sen, Aparajita; Ghosh, Tuhin; Pravabati, C; Basak, Soumen (American Physical Society, 2021-06-15)
    We test the statistical isotropy (SI) of the E -mode polarization of the cosmic microwave background (CMB) radiation observed by the Planck satellite using two statistics, namely, the α estimator that is derived ...
  • Astronomy in India in the 20th century. 
    Bhattacharyya, J. C; Vagiswari, A (Indian National Science Academy, 1985)
  • Astrophysical consequences of neutron-antineutron oscillations 
    Krishan, V; Sivaram, C (Springer, 1982-10)
    Grand unified theories predict baryon number violating interactions and one of the implications of this is the possible existence of neutron-antineutron oscillations. The neutron-antineutron oscillations have been considered ...
  • Basic plasma processes on the sun : proceedings of the 142th symposium of the International Astronomical Union held in Bangalore, India, December 1-5, 1989 
    Priest, E. R (editor); Krishan, V (editor) (Kluwer Academic Publishers, 1990)
    Much of the excitement in modern Solar Physics has come from the realisation that the Sun is a plasma and that this plasma is interacting with the magnetic field in a wide variety of subtle ways. As well as being of great ...
  • Calibration on the Sun for stellar magnetic fields 
    Sivaraman, K. R; Bagare, S. P; Gupta, S. S; Kariyappa, R (Springer, 1987-07)
    The intimate association between the surface magnetic fields and the Ca II K-line emission known to exist on the Sun, holds a promise for using this property to detect the presence of global magnetic fields on Sun-like ...
  • A compilation of physical parameters of AP and AM stars as derived from energy distribution studies 
    Babu, G. S. D; Shylaja, B. S (Kluwer Academic Publishers, 1981-09)
    The physical parameters, such as the effective temperatures, radii, bolometric magnitudes and bolometric corrections of 87 Ap and Am stars out of the 125 compiled here are essentially based on the work done by the authors ...
  • Core-collapse SNe of type IIP and their progenitors: The case study of PNV J01315945+3328458 
    Dastidar, R; Kumar, B; Sahu, D. K; Misra, K; Singh, M; Gangopadhyay, A; Anapuma, G. C; Pandey, S. B (Societe Royale des Sciences de Liege, 2018-04)
    The type II supernovae (SNe) are hydrogen-rich cosmic explosions resulting from the collapse of massive stars. The impetus of studying individual events arises from its cosmological importance and the diverse understanding ...
  • 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 dust content and radiation fields of sample of galaxies in the ELAIS-N1 field 
    Shalima, P; Gogoi, R; Pathak, A; Misra, R; Gupta, R; Vaidya, D. B (The University of Chicago Press on behalf of the Astronomical Society of the Pacific, 2015-08)
    The Mid-IR colors (F8/F24) of galaxies together with their IR-UV luminosity correlations can be used to get some insight into the relative abundance of the different dust grain populations present in them. The ELAIS-N1 ...
  • Ejection of massive black holes from galaxies 
    Kapoor, R. C (Indian Academy of Sciences, 1976-11)
    Gravitational recoil of a gigantic black hole of about 10 to the 8th to 10 to the 9th solar masses formed in the nonspherical collapse of the nuclear part of a typical galaxy can take place with an appreciable speed as a ...
  • Electromagnetic radiation in a helical magnetic field 
    Krishan, V (1984)
    Electromagnetic radiation spectrum is studied in a helical magnetic field since such magnetic field configurations may be present in cosmic objects. It is shown that, by a proper choice of the spatial period of the magnetic ...
  • Estimation of Astrophysically Useful Parameters for SnF and ScF Molecules 
    Sri Ramachandran, P; Shanmugavel, R; Rajamanickam, N; Bagare, S. P (Editura Academiei Romane, 2008)
    The calculation of Franck-Condon factors and r-centroids are of interest to studY the electronic transition between bound molecular states
  • Exploring pre-main sequence variables of ONC: the new variables 
    Parihar, P. S; Messina, S; Distefano, E; Shantikumar, N. S; Medhi, B. J (Wiley Blackwell, 2009-07)
    Since 2004, we have been engaged in a long-term observing program to monitor young stellar objects in the Orion Nebula Cluster. We have collected about two thousands frames in V, R, and I broad-band filters on more than ...
  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...

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