Browsing by Author "Omar, A."

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  • Devasthal Fast Optical Telescope Observations of Wolf–Rayet Dwarf Galaxy Mrk 996 
    Jaiswal, S.; Omar, A. (Indian Academy of Sciences, 2013)
    The Devasthal Fast Optical Telescope (DFOT) is a 1.3 meter aperture optical telescope, recently installed at Devasthal, Nainital. We present here the first results using an Hα filter with this telescope on a Wolf–Rayet ...
  • GMRT H I observations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2005)
    TThe GMRT H I 21cm-line observations of galaxies in the Eri- danus group are presented. The Eridanus group, at a distance of ∼ 23 Mpc, is a loose group of ∼ 200 galaxies. The group extends to more than 10 Mpc in ...
  • The HI content of the eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2005)
    The HI content of galaxies in the Eridanus group is studied using the GMRT observations and the HIPASS data. A significant HI deficiency up to a factor of 2–3 is observed in galaxies in the high galaxy density regions. The ...
  • LOFAR: The LOw-Frequency ARray 
    Haarlem, M. P. van, et al.; Omar, A. (ESO, 2013)
    LOFAR, the LOw-Frequency ARray, is a new-generation radio interferometer constructed in the north of the Netherlands and across europe. Utilizing a novel phased-array design, LOFAR covers the largely unexplored low-frequency ...
  • The new 130-cm optical telescope at Devasthal, Nainital 
    Sagar, R.; Omar, A.; Kumar, Brijesh; Gopinathan, M.; Pandey, S. B.; Bangia, T.; Pant, J.; Shukla, V.; Yadava, S. (2011)
    A modern Ritchey-Chretein Cassegrain 130-cm diameter optical telescope has been successfully installed at Devasthal, Nainital in the central Himalayan region. This location was chosen after carrying out extensive site ...
  • New optical telescope projects at Devasthal Observatory 
    Sagar, R.; Kumar, Brijesh; Omar, A.; Pandey, A. K. (2012)
    Devasthal, located in the Kumaun region of Himalayas is emerging as one of the best optical astronomy site in the continent. The minimum recorded ground level atmospheric seeing at the site is 0.”6 with median value at ...
  • New optical telescopes at Devasthal observatory : 1.3-m installed and 3.6-m upcoming 
    Sagar, R.; Kumar, Brijesh; Omar, A.; Joshi, Y. C. (ASI, 2012)
    The Devasthal Observatory, located at about 2450 m height above sea level in the central Himalayas, operates a 1.3-m optical tele- scope, commissioned in the year 2010 and building another 3.6-m optical telescope to be ...
  • Origin of disc lopsidedness in the Eridanus group of galaxies 
    Angiras, R. A.; Jog, C. J.; Omar, A.; Dwarakanath, K. S. (2006)
    The H I surface density maps for a sample of 18 galaxies in the Eridanus group are Fourier analysed. This analysis gives the radial variation of the lopsidedness in the H I spatial distribution. The lopsidedness is ...
  • A possibility of Magnus effect on disk galaxies 
    Omar, A. (CURRENT SCIENCE, 2011)
    The Magnus effect introduced near the turbulent boundary layer in the flow of rotating disk galaxies in the intergalactic medium (IGM) is discussed. The Magnus effect is expected to develop an extra pressure on the outer ...
  • Radio continuum and far-infrared emission from the galaxies in the eridanus group 
    Omar, A.; Dwarakanath, K. S. (2005)
    The Eridanus galaxies follow the well-known radio–FIR correlation. The majority (70%) of these galaxies have their star formation rates below that of the Milky Way. The galaxies that have a significant excess of radio ...
  • The Tully–fisher relations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2006)
    The Tully–Fisher (TF) or the luminosity–linewidth relations of the galaxies in the Eridanus group are constructed using the HI rotation curves and the luminosities in the optical and in the near-infrared bands. The slopes ...

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