Publications of Astronomical Society of India: Recent submissions

  • Observation of hard X-ray emission from extragalactic sources 3C 273 and NGC 5506 in 20-200 keV band 
    Manchanda, R. K (Astronomical Society of India, 2001)
    We report spectral measurements of the bright QSO 3C273 and the AGN source NGC 5506 made during a balloon flight experiment using high sensitivity scintillation counter telescope LASE, operating in the 20-200 keV energy ...
  • Relativistic beaming and central components of radio galaxies 
    Kharb, P; Shastri, P (Astronomical Society of India, 2001)
    We present results of our study of the parsec-scale components of radio galaxies as observed at radio and optical wavelengths, in the framework of the Unified Scheme.
  • Study of variability in BL Lac objects 
    Baliyan, K. S; Ganesh, S; Joshi, U. C; Shah, C. R; Vadher, N. M; Deshpande, M. R (Astronomical Society of India, 2001)
    We have monitored some of the BL Lac objects, such as OJ287, Mrk 421, Mrk 501 etc from Mt Abu Infrared Observatory, using optical photopolarimeter, CCD and NICMOS-3 IR array mounted at the Cassegrain focus of the 1.2 m ...
  • Discovery of a new NLQSO: RX J1334.2+3759 
    Dewangan, G. C; Singh, K. P; Jones, L. R; McHardy, I. M; Newsam, A. M; Mason, K. O (Astronomical Society of India, 2001)
    A new narrow-line QSO, RX J1334.2+3759, has been identified at a redshift of 0.3858. The QSO has intrinsic soft X-ray luminosity ~ 2.8 x 1044 erg s-1. Soft X-ray emission from the QSO is highly variable. Rapid variability ...
  • Soft X-ray properties of a complete sample of QSOs 
    Dewangan, G. C; Singh, K. P (Astronomical Society of India, 2001)
    In order to study systematically the soft X-ray emission of AGNs, we have analyzed ROSAT PSPC spectra of 22 QSOs. The QSOs form a complete sample with soft X-ray flux ??1.4 x 10-14 erg cm-2 s-1 in the energy band of 0.1-2.0 ...
  • Wolf-Rayet galaxies and their CCD photometry 
    Sanwal, B. B (Astronomical Society of India, 2001)
    Galaxies with Wolf-Rayet star features in their spectra have long been known. They are characterised by a broad emission feature at ? 4686 Å. This is attributed to stellar HeII emission from a large population of WR stars. ...
  • Multiwavelength study of the variability in blazars 
    Baliyan, K. S (Astronomical Society of India, 2001)
    Blazars are the radio-loud AGNs with polarized, highly luminous and rapidly variable non-thermal continuum emission ranging from radio to ??rays, from a relativistic jet. These features are interpreted in terms of the ...
  • Photometric studies of intermediate and old age galactic star clusters 
    Durgapal, A. K (Astronomical Society of India, 2001)
    We present a detailed analysis of five intermediate / old age open star clusters, based on the CCD UBVRI data. We have used a new colour index parameter (CIP), which is the difference in colour index between the blue turn ...
  • Spectroscopic investigations of planetary nebulae 
    Muthumariappan, C (Astronomical Society of India, 2001)
    The morphologies of three selected asymmetrical planetary nebulae (PNe), namely NGC 4361, NGC 1514 and NGC 246, were studied using spatio-kinematic observations made with an Imaging Fabry-Perot Spectrometer. From the 3D ...
  • A study of the local environment of novae in the Large Magellanic Cloud 
    Subramaniam, A; Anupama, G. C (Astronomical Society of India, 2001)
  • Optical spectroscopy of nova V1494 Aquilae 1999 
    Anupama, G. C; Sahu, D. K; Mayya, Y. D (Astronomical Society of India, 2001)
  • TeV gamma-ray flux estimates from EGRET supernova remnant sources 
    Kaul, R. K (Astronomical Society of India, 2001)
    The EGRET experiment, onboard the Compton Gamma-Ray Observatory (CGRO) satellite, has provided evidence of possible ??100 MeV gamma-ray emission from ~ 22 supernova remnants through positional correlation alone. In view ...
  • Relativistic outflows from advection-dominated accretion disks around black holes 
    Subramanian, P; Becker, P. A; Kazanas, D (Astronomical Society of India, 2001)
  • Timing and spectral studies of the 1999 Outburst of 4U 1630-47 
    Abraham, L; Agrawal, V; Sreekumar, P; Seetha, S (Astronomical Society of India, 2001)
  • Study of type I X-ray bursts from 4U 1705-44 using IXAE and PCA data 
    Agrawal, V. K; Sreekumar, P; Seetha, S; Agrawal, P. C (Astronomical Society of India, 2001)
  • Pulse profiles of binary X-ray pulsars in 20-200 keV band 
    Manchanda, R. K (Astronomical Society of India, 2001)
    Hard X-ray observations of the binary X-ray pulsars were made using a balloon-borne large area scintillation counter telescope in the 20-200 keV band. Apart from many other galactic and extragalactic X-ray sources, three ...
  • Observation of X-ray binary Cygnus X-3 by Indian X-ray Astronomy Experiment 
    Singh, N. S; Singh, K. Y; Naik, S; Paul, B; Agrawal, P. C (Astronomical Society of India, 2001)
    The X-ray binary Cygnus X-3 was observed with the Indian X-ray Astronomy Experiment (IXAE) on Board the Indian Remote Sensing Satellite IRS-P3 during July 3-13, 1999 and October 11-24, 1999 with total useful exposure time ...
  • Are pulsars strange? 
    Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 2001)
    Pulsar radio pulses are made up of the so called core and conal components. A remarkably precise relation for core component widths, found observationally, in effect specifies the size of the polar cap on pulsars. Inclusion ...
  • Dynamical effects of a cloud complex on stellar and HI components in a galaxy 
    Jog, C. J; Narayan, C. A (Astronomical Society of India, 2001)
    We investigate the dynamical effects of a molecular cloud complex with a mass ~ 107M? and a size of ~ few 100 pc, on the vertical distribution of stars and HI in a galactic disc. The complex has a strong local confining ...
  • PRLNIC3 observations of star forming cloud L1340 
    Ganesh, S; Joshi, U. C; Baliyan, K. S; Shah, C. R; Jain, J. K; Rajpurohit, G. S; Sanchawala, K; Saha, A. B (Astronomical Society of India, 2001)
    Due mainly to high extinction in optical, the structure of our galaxy, Milky Way, is not very well understood. The Galactic disk and bulge contain a host of heavily reddened open clusters which are deeply embedded within ...

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