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Browsing by Author "Murthy, J"

Browsing by Author "Murthy, J"

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  • Depletion Studies in the Interstellar Medium 
    Haris, U; Parvathi, V. S; Gudennavar, S. B; Murthy, J (American Institute of Physics, 2013-06)
    We report interstellar Si depletion and dust-phase column densities of Si along 131 Galactic sight lines using previously reported gas-phase Si II column densities, after correcting for the differences in oscillator ...
  • Design and analysis of an FUV spectrograph for a small satellite 
    Munshi, R; Prasad, B. R; Murthy, J (Astronomical Society of India, 2009-06)
    The Halo Ultraviolet Explorer (HUE) is a payload aimed at studying the diffuse far ultraviolet sky over a bandpass of 800 -- 1200 Ao. The novel features of HUE include a large effective collecting area (254 cm2) and fast ...
  • Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies 
    Nirmal, K; Sridharan, R; Sriram, S; Murthy, J; Ambily, S; Safonova, M; Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar (SPIE--The International Society for Optical Engineering, 2018-04)
    Spatial heterodyne spectroscopy (SHS) is an interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson interferometer. An imaging detector is used at the output of an SHS to ...
  • Determining Interstellar Carbon Abundances from Strong-line Transitions 
    Sofia, U. J; Parvathi, V. S; Babu, B. R. S; Murthy, J (IOP Publishing, 2011-01)
    Carbon is arguably the most important element in the interstellar medium, yet its abundance in gas and dust is poorly understood due to a paucity of data. We explore the possibility of substantially increasing our knowledge ...
  • Development of Data Acquisition Methods for an FPGA-Based Photon Counting Detector 
    Ambily, S; Mayuresh, Sarpotdar; Mathew, J; Sreejith, A. G; Nirmal, K; Prakash, A; Safonova, M; Murthy, J (World Scientific Publishing Co., 2017-03)
    MCP-based detectors are widely used in the ultraviolet (UV) region due to their low noise levels, high sensitivity and good spatial and temporal resolution. We have developed a compact near-UV (NUV) detector for highaltitude ...
  • The Diffuse Radiation Field at High Galactic Latitudes 
    Akshaya, M. S; Murthy, J; Ravichandran, S; Henry, R. C; Overduin, J (IOP Publishing, 2018-08-10)
    We have used GALEX observations of the north and south Galactic poles to study the diffuse ultraviolet background at locations where the Galactic light is expected to be at a minimum. We find offsets of 230–290 photon units ...
  • Diffuse radiation from the Aquila Rift 
    Jyothy, S. N; Murthy, J; Karuppath, N; Sujatha, N. V (Oxford University Press on behalf of the Royal Astronomical Society, 2015-12-01)
    We present an analysis of the diffuse ultraviolet (UV) background in a low latitude region near the Aquila Rift based on observations made by the Galaxy Evolution Explorer (GALEX). The UV background is at a level of about ...
  • The Diffuse Ultraviolet Foreground 
    Murthy, J (Springer, 2014-01)
    Ultraviolet observations from low Earth orbit (LEO) have to deal with a foreground comprised of airglow and zodiacal light which depend on the look direction and on the date and time of the observation. We have used all-sky ...
  • Discovering a celestial object using a non-parametric algorithm 
    Vyasanakere, Jayanth P; Bhatnagar, Siddharth; Murthy, J (Springer, 2021-12)
    We describe a method that does not use any orbital parameters, to arrive at the position and mass of a new celestial object, using high-precision orbital state vector data of the rest of the objects in the system. As ...
  • The distribution and kinematics of interstellar O VI in the milky way 
    Sarma, R; Pathak, A; Murthy, J; Sarma, J. K (Oxford University Press on behalf of the Royal Astronomical Society, 2017-02)
    We present the results of a survey of interstellar O VI absorption in the Milky Way (MW) towards 69 stars in the Large Magellanic Cloud obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). The integrated MW ...
  • Dust properties from GALEX observations of a UV halo around Spica 
    Shalima, P; Murthy, J; Gupta, R (Terra Scientific Publishing Company, 2013-10-24)
    GALEX has detected ultraviolet halos extending as far as 5° around four bright stars (Murthy and Henry, 2011). These halos are produced by scattering of starlight by dust grains in thin foreground clouds that are not ...
  • Dust Properties in the Far-Ultraviolet in Ophiuchus 
    Sujatha, N. V; Shalima, P; Murthy, J; Henry, R. C (The American Astronomical Society, 2005-11)
    We have derived the albedo (a) and phase function asymmetry factor (g) of interstellar dust grains at 1100 Å using archival Voyager observations of diffuse radiation in Ophiuchus. We have found that the grains are highly ...
  • Dust scattered radiation in the galactic poles 
    Murthy, J; Henry, R. C; Overduin, James (Indian Academy of Sciences, 2023-12)
    We have modeled the diffuse background at the Galactic Poles in the far-ultraviolet (FUV: 1536 Å) and the near-ultraviolet (NUV: 2316 Å). The background is well-fit using a single-scattering dustmodel with an offset ...
  • Dust scattering from the taurus molecular cloud 
    Sathya Narayan; Murthy, J; Narayanankutty, K (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    We present an analysis of the diffuse ultraviolet emission near the Taurus Molecular Cloud based on observations made by the Galaxy Evolution Explorer. We used a Monte Carlo dust scattering model to show that about half ...
  • Dust-scattered Ultraviolet Halos around Bright Stars 
    Murthy, J; Conn Henry, R (IOP Publishing, 2011-06-10)
    We have discovered ultraviolet (UV) halos extending as far as 5° around four (of six) bright UV stars using data from the Galaxy Evolution Explorer satellite. These halos are due to scattering of the starlight from nearby ...
  • Estimation of CII and CII* column densities along Galactic sight-lines 
    Parvathi, V. S; Sofia, U. J; Murthy, J; Babu, B. R. S (Astronomical Society of India, 2010-09)
    We present interstellar CII (1334.5323 \AA) and CII* (1335.7077 \AA) column density measurements along 14 Galactic sight-lines. These sight-lines sample a variety of Galactic disk environments and include paths that range ...
  • Evolution of the universe and Earth’s place in cosmos – The 2019 Nobel Prize for Physics 
    Murthy, J (Indian Academy of Sciences, 2019-11-10)
    This was an unusual Nobel prize in that it was awarded ‘for contributions to our understanding of the evolution of the universe and Earth’s place in the cosmos’. This is a broad area which could include almost anything in ...
  • Extragalactic survey of UV Galaxies using GALEX 
    Bose, L. S; Narayanankutty, K; Sujatha, N. V; Murthy, J (International Organization Of Scientific Research (IOSR), 2014-05)
    We report here the results of the study of extragalactic radiation using number counts of galaxies at high galactic latitudes. For this study nine GALEX DIS targets around ELAISN1 in the North Pole. The overlapped regions ...
  • Extragalactic survey using GALEX–spitzer matching fields 
    Bose, L. S; Sujatha, N. V; Narayanankutty, K; Murthy, J (Pleiades Publishing, 2015-12)
    We have used Spitzer observations of galaxies in the ELAIS-N1 region centered at 16h10m01s, +54◦30′36″ to extend the effective sensitivity of GALEX UV observations of the same region. Spitzer is more sensitive to external ...
  • Far-ultraviolet Diffuse Emission from the Large Magellanic Cloud 
    Pradhan, A. C; Pathak, A; Murthy, J (IOP Publishing, 2010-08)
    We present the first observations of diffuse radiation in the far-ultraviolet (FUV; 1000-1150 Å) from the Large Magellanic Cloud based on observations made with the Far Ultraviolet Spectroscopic Explorer. The fraction of ...

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