More information about my research interests can be obtained by looking at the linked publications below.

CURRICULUM VITAE and FULL PUBLICATION LIST as a PDF file.

Search for all papers on on NASA's Astrophysical Data Service (ADS)

Selected publications, most with links to full articles, are below.

Selected Recent Publications

Most of the following papers have co-authors who are listed here only for papers published in 2006 or later;
co-authors of earlier papers can be found in my CV, the ADS link above or on the individual papers.

The links below since are to abstracts (on arXiv.org) which then offer the full text in either postscript or pdf formats.
Note that the cited journal versions may be more
up-to-date than the posted version and the ADS search link above is more complete.

• Detection of Intra-day Variability Timescales of Four High Energy Peaked Blazars with XMM-Newton H. Gaur, A.C. Gupta, P. Lachowicz & P.J. Wiita, Astrophysical J., in press (2010)
• Probing Spectral Properties of Radio-Quiet Quasars Searched for Optical Microvariability H. Chand, P.J. Wiita & A.C. Gupta, Monthly Notices Royal Astron. Soc., 402, 1059 (2010)
• Optical Variability of Radio-Intermediate Quasars A. Goyal, Gopal-Krishna, S. Joshi, R. Sagar, P.J. Wiita, G.C. Anupama & D.K. Sahu Monthly Notices Royal Astron. Soc., 401, 2622 (2010)
• The Changing ISM of Massive Elliptical Galaxies and Cosmic Evolution of Radio Galaxies and Quasars" A. Mangalam, Gopal-Krishna & P.J. Wiita Monthly Notices Royal Astron. Soc., 397, 2216 (2009)
• Nearly Periodic Fluctuations in the Long Term X-ray Light Curves of the Blazars AO 0235+164 and 1ES 2321+419 B. Rani, P.J. Wiita, & A.C. Gupta, The Astrophysical Journal, 696, 2170 (2009)
• A Multifrequency Study of Possible Relic Lobes in Giant Radio Sources S. Godambe, C. Konar, D.J. Saikia, & P.J. Wiita, Monthly Notices Royal Astron. Soc., 396, 860 (2009)
• Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714, A.C. Gupta, A.K. Srivastava, P.J. Wiita, The Astrophysical Journal, 690, 216 (2009)
• Superdisks and the Structural Asymmetry of Radio Galaxies, Gopal-Krishna & P.J. Wiita, New Astronomy, 14, 51 (2009)
• Radio Properties of Low Redshift Broad Line Active Galatic Nuclei, S. Rafter, D.M. Crenshaw, P.J. Wiita, The Astronomical Journal, 137, 42 (2009)
• Stellar Disruption by Supermassive Black Holes and the Quasar Radio Loudness Dichtomy, Gopal-Krishna, A. Mangalam, & P.J. Wiita, The Astrophysical Journal (Letters), 680, L13 (2008)
• Influence of the Jet Opening Angle on the Derived Kinematical Parameters of Blazar Jets Having Uniform and Stratified Bulk Motion, Gopal-Krishna, S. Dhurde, P. Sircar, & P.J. Wiita, Monthly Notices of the Royal Astronomical Society, 377, 446 (2007)
• Testing Models of Radio Galaxy Evolution and the Cosmological Impact of FR II Radio Galaxies, P. Barai & P.J. Wiita, The Astrophysical Journal, 658, 217 (2007)
• Relativistic Jet Interactions with Dense Clouds, E. Choi, P.J. Wiita, & D. Ryu, The Astrophysical Journal, 655, 769 (2007)
• Testing Models of the Individual and Cosmological Evolutions of Powerful Radio Galaxies, P. Barai & P.J. Wiita, Monthly Notices of the Royal Astronomical Society, 372, 381 (2006)
• Bulk Motion of Ultrarelativistic Conical Blazar Jets, Gopal-Krishna, P.J. Wiita & S. Dhurde, Monthly Notices of the Royal Astronomical Society, 369, 1287 (2006)
• Active Galactic Nuclei: Unification, Blazar Variability and the Radio Galaxy/Cosmology Interface, Journal of the Korean Physical Society, 49, 1753 (2006)
• Multiband Optical Monitoring of the Blazars S5 0716+714, 3C 345 and BL Lacertae, C.S. Stalin, Gopal-Krishna, Ram Sagar, P.J. Wiita, V. Mohan & A.K. Pandey Monthly Notices of the Royal Astronomical Society, 366, 1337 (2006)
• Accretion Disks, Jets and Blazar Variability, in Blazar Variability II: Entering the GLAST Era, eds. H.R. Miller, K. Marshall, J.R. Webb & M.F. Aller (ASP Conference Series, Vol 359), 183 (2006)
• Jet Propagation and the Asymmetries of Compact Steep Spectrum Radio Sources Astronomy & Astrophysics, 432, 823 (2005)
• Asymmetries in Powerful Extragalactic Radio Sources in 21st Century Astrophysics, eds. S. K. Saha & V. K. Rastogi (Anita Publications: New Delhi), p. 108 (2005)
• Intranight Optical Variability of BL Lacs, Radio-Quiet Quasars and Radio-Loud Quasars, Monthly Notices of the Royal Astronomical Society, 356, 607 (2005)
• Do the Mildly Superluminal VLBI Knots Exclude Ultrarelativistic Blazar Jets?, The Astrophysical Journal (Letters), 615, L81 (2004)
• Intranight Optical Variability of Radio-Quiet and Radio-Lobe Dominated Quasars, Monthly Notices of the Royal Astronomical Society, 350, 175 (2004)
• Brightness Suppression of Relativistic Radio Jets in Quasars: The Role of the Lower Electron Energy Cut-off, The Astrophysical Journal (Letters), 603, L9 (2004)
• The N Enrichment and Supernova Ejection of the Runaway Microquasar LS 5039, The Astrophysical Journal, 600, 927 (2004)
• The Origin of X-shaped Radio Galaxies: Clues from the Z-symmetric Secondary Lobes, The Astrophysical Journal (Letters), 594, L103 (2003)
• Clear Evidence for Intranight Optical Variability in Radio-quiet Quasars, The Astrophysical Journal (Letters), 586, L25 (2003)
• Wind Accretion and State Transitions in Cygnus X-1, The Astrophysical Journal, 583, 424 (2003)
• Microflares in Accretion Disks, Astronomy and Astrophysics, 398, 819 (2003)
• Radio Galaxies and the Star Formation History of the Universe in Active Galactic Nuclei: from Central Engine to Host Galaxy, S. Collin, F. Combes and I. Shlosman (eds.) (ASP Conference Series, Vol 290), 319 (2003)
• Cosmic Radio Jets, in Frontiers of Astrophysics, ed. S.K. Chakrabarti (New Delhi: Allied Publishers), 280 (2002)
• The Spectral Components of SS 433, The Astrophysical Journal, 566, 1069 (2002)
• On the Ejection Mechanism of Bullets in SS 433, The Astrophysical Journal (Letters), 576, L45 (2002)
• The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy, Astronomy and Astrophysics, 373, 100 (2001)
• Was the Cosmic Web of Protogalactic Material Permeated by Lobes of Radio Galaxies During the Quasar Era? The Astrophysical Journal (Letters), 560, L115 (2001)
• Are the Hotspots of Radio Galaxies the Sites of in-situ Acceleration of Relativistic Particles? Astronomy and Astrophysics, 377, 827 (2001)

  

  Some Recent Talks

• Jets in Blazars and Radio Galaxies
  
• AGN and Unification
  
• Blazars and the Radio Galaxy/Cosmology Interface
  
• Theoretical Astrophysics at GSU
  
• Semi-Popular AGN Talk
  

  

  Radio Galaxy Codes

• Modified BRW Radio Galaxy Codes mostly written by my ex-student, Paramita Barai

  

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  Last updated, 15 June 2010

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