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Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition
Galactic Logarithmic Spiral Arm Pitch Angle Two-Dimensional Fast Fourier Transform Decomposition
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2012/2/23
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes...
WMAP 7 year constraints on CPT violation from large angle CMB anisotropies
CMBR theory CMBR experiments
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2011/10/18
We constrain the rotation angle $\alpha$ of the linear polarization of CMB photons using the large angular scale (up to $\sim 4^\circ$) signal in WMAP 7 year data. At these scales, the CMB polarizatio...
The Solar neighbourhood in angle coordinates: the Hyades moving group
solar neighbourhood – Galaxy: kinematics and dynamics – methods: data analysis
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2011/9/29
I investigate the suggestion that the Hyades moving group in the Solar neighbourhood is the result of a recent inner Lindblad resonance. I use dynamical "torus" models of the Galaxy to understand the ...
Large-angle correlation anomalies and odd-parity preference in CMB data
cosmic background radiation early universe methods: data analysis meth-ods: statistical
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2010/11/9
Angular power spectrum of CMB anisotropy and two point angular point correlation possess some
equivalence. Noting this, we have investigated the association between the WMAP large-angle corre-lation ...
Distribution of Magnetic Shear Angle in an Emerging Flux Region
Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/23
We study the distribution of magnetic shear in an emerging flux region using the high-resolution Hinode/SOT SP observations. The distribution of mean magnetic shear angle across the active region show...
Self-initialised Fermi-1 acceleration by pitch-angle re-scattering of solar wind ions reflected from the parallel termination shock
anomalous cosmic ray process governing pick-up ions solar wind ions
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2009/5/27
In a recent kinetic calculation a rather high amount of reflected ions was shown to occur at the solar wind termination shock under a parallel magnetic field orientation. The fate of these reflected i...
Long-term Modulation of Cosmic Ray Intensity in relation to Sunspot Numbers and Tilt Angle
Cosmic ray intensity sunspot numbers tilt angle
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2009/5/7
Adetailed correlative analysis between sunspot numbers (SSN) and tilt angle (TA) with cosmic ray intensity (CRI) in the neutron monitor energy range has been performed for the solar cycles 21, 22 and ...
GMRT Detection of a New Wide-Angle Tail (WAT) Radio Source Associated with the Galaxy PGC 1519010
Radio galaxies cluster of galaxies ram pressure intracluster
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2010/9/15
We report the serendipitous detection of a Wide-Angle Tail (WAT) radio galaxy at 240 and 610 MHz, using the Giant Metrewave Radio Telescope (GMRT). This WAT is hosted by a cD galaxy PGC 1519010 whose ...
SPHERICAL TRIGONOMETRY OF THE PROJECTED BASELINE ANGLE
Methods analytical-Techniques interferometric-Reference systems
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2009/2/8
The basic vector geometry of a stellar interferometer with two
telescopes is de¯ned by the right triangle of (i) the baseline vector between the
telescopes, of (ii) the delay vector which point...
Long-term Modulation of Cosmic Ray Intensity in relation to Sunspot Numbers and Tilt Angle
Cosmic ray intensity sunspot numbers tilt angle
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2010/9/16
Adetailed correlative analysis between sunspot numbers (SSN)and tilt angle (TA) with cosmic ray intensity (CRI) in the neutron monitor energy range has been performed for the solar cycles 21, 22 and 2...