Research Interests

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

Selected (Relatively) 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 or on the individual papers.

Most links since 2000 are to abstracts (on www.arXiv.org) which then offer the full text in either postscript or pdf formats;
the remainder are to either postscript or pdf files. Note that the cited journal versions may be more
up-to-date than the posted version.

• 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)
• Low Level Radio Emission from Radio Galaxies and Implications for the Large Scale Structure, Journal of the Korean Astronomical Society, 37, 517 (2004)
• Intranight Optical Variability of Radio-Quiet and Radio-Lobe Dominated Quasars, Monthly Notices of the Royal Astronomical Society, 350, 175 (2004)
• Intranight Optical Variability of Blazars, Monthly Notices of the Royal Astronomical Society, 348, 176 (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)
• Symmetry Parameters of CSSs: Evidence of Fuelling?, Publications of the Astronomical Society of Australia, 20, 50 (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)
• Superdisks in Radio Galaxies, The Astrophysical Journal, 529, 189 (2000)
• Effect of Beam-Plasma Instabilities on Accretion Disk Flares, Astronomy and Astrophysics, 356, 373 (2000)
• Rapid Optical Variability in Radio Quiet QSOs, Monthly Notices of the Royal Astronomical Society, 314, 815 (2000)
• Radio Jet Interactions with Massive Clouds, The Astrophysical Journal, 534, 201 (2000)
• Models of Accretion Disk Fluctuations through Self-Organized Criticality including Relativistic Effects, Publications of the Astronomical Society of Japan, 52, 1097 (2000)
• Extragalactic Radio Sources with Hybrid Morphology: Implications for the Fanaroff-Riley Dichotomy, Astronomy and Astrophysics, 363, 507 (2000)
• Viscosity in Accretion Disks, in Observational Evidence for Black Holes in the Universe, ed. S.K. Chakrabarti (Dordrecht: Kluwer), 49 (1999)
• Spectral and Temporal Variability Incorporating General Relativistic Effects, in BL Lac Phenonmenon, ed. L.O. Takalo & A. Sillanpaa, ASP Conf. Ser. 159, (San Francisco: ASP) 483 (1999)
• X-ray Variability of an Illuminated Irregular Accretion Disk around a Black Hole, The Astrophysical Journal, 519, 80 (1999)
• Instabilities in Three-Dimensional Simulations of Astrophysical Jets Crossing Tilted Interfaces, The Astrophysical Journal, 493, 81 (1998)
• Accretion Disks around Black Holes, in Black Holes, Gravitational Radiation and the Universe, eds. B.R. Iyer & B. Bhawal (Dordrecht: Kluwer), 249 (1998)
• Self-Organized Criticality in Accretion Disks, in Theory of Black Hole Accretion Disks, eds. M. Abramowicz, G. Bjornsson & J. Pringle (Cambridge: Cambridge Univ. Press), 274 (1998)
• The Flux Ratio of a Jet to its Counterjet Revisited, The Astrophysical Journal, 485, 136 (1997)
• Polarization Variability of Active Galactic Nuclei and X-ray Binaries, The Astrophysical Journal, 487, 142 (1997)
• On the Variability Coherence Observed in Black Hole Candidates at Different X-Ray Energies, The Astrophysical Journal, 489, 819 (1997)
• The Linear Sizes of Quasars and Radio Galaxies in the Unified Scheme, The Astrophysical Journal (Letters), 463, L1 (1996)
• Three-Dimensional Simulations of Extragalactic Jets Crossing ISM/ICM Interfaces, The Astrophysical Journal, 470, 211 (1996)
• Weak Headed Quasars , Astronomy & Astrophysics, 316, L13 (1996)
• Energy-dependent Polarization Variability as a Black Hole Signature, Physical Review Letters, 77, 12 (1996)
• On the Origin of Correlated Radio-Optical Asymmetries in Double Radio Sources, The Astrophysical Journal, 467, 191 (1996)

Radio Galaxy Codes

Modified BRW Radio Galaxy Codes

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Last updated, 17 September 2007

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