Fundamentals of radio astronomy - Radio Observations of Active
... • All the above was derived for a scalar electric field (single polarization) • Electromagnetic radiation is a vector phenomenon: – EM waves are intrinsically polarized – monochromatic waves are fully polarized ...
... • All the above was derived for a scalar electric field (single polarization) • Electromagnetic radiation is a vector phenomenon: – EM waves are intrinsically polarized – monochromatic waves are fully polarized ...
DEPOLARIZATION OF RADIO BURSTS DUE TO REFLECTION OFF
... for reflection at sufficiently small angles, and that there is almost complete reversal of the polarization on reflection at sufficiently large angles. Strong depolarization occurs for reflection near the contour pR ¼ 0. There are two sections of the contour pR ¼ 0 in Figure 1, one in the region of ...
... for reflection at sufficiently small angles, and that there is almost complete reversal of the polarization on reflection at sufficiently large angles. Strong depolarization occurs for reflection near the contour pR ¼ 0. There are two sections of the contour pR ¼ 0 in Figure 1, one in the region of ...
Electromagnetic Intro
... • There are no fields parallel to the direction of propagation, • only perpendicular (transverse). • If have an electric field Ex(z) – …then must have a corresponding magnetic field Hx(z) ...
... • There are no fields parallel to the direction of propagation, • only perpendicular (transverse). • If have an electric field Ex(z) – …then must have a corresponding magnetic field Hx(z) ...
Instruments and Methods of Astrophysical X-ray
... 3 GPD (1-cm, 1-Atm, He-DME 20-80) MDP 12 % in 105 s for 1 mCrab source (2-10 keV) 3.8 % in 105 s for 10 mCrab source (2-10 keV) ...
... 3 GPD (1-cm, 1-Atm, He-DME 20-80) MDP 12 % in 105 s for 1 mCrab source (2-10 keV) 3.8 % in 105 s for 10 mCrab source (2-10 keV) ...
SPECTRAL STATE DEPENDENCE OF THE 0.4–2 MEV
... measurements that are classified into different states are presumed to have ocurred during a state transition and are excluded from the analysis. Most ScWs are, however, not strictly simultaneous with any ASM measurements. To classify ScWs without simultaneous ASM measurements, we therefore used the ...
... measurements that are classified into different states are presumed to have ocurred during a state transition and are excluded from the analysis. Most ScWs are, however, not strictly simultaneous with any ASM measurements. To classify ScWs without simultaneous ASM measurements, we therefore used the ...
Physical and Kinematical Properties in Central Part of Active
... Astronomical Observatory, Belgrade, Serbia ...
... Astronomical Observatory, Belgrade, Serbia ...
Causal nonlinear quantum optics
... Goal: find phenomenological description of e.m. field interaction with macroscopically large systems ...
... Goal: find phenomenological description of e.m. field interaction with macroscopically large systems ...
Further VLBA Observations of SiO Masers toward Mira
... The compressed total intensity images for each epoch and transition with superposed polarization “E” vectors are shown in Figures 1 – 3. (Expanded views of these figures with and without polarization vectors are avaliable in electronic form.) The fitted ring diameters and width are shown in Table 2 ...
... The compressed total intensity images for each epoch and transition with superposed polarization “E” vectors are shown in Figures 1 – 3. (Expanded views of these figures with and without polarization vectors are avaliable in electronic form.) The fitted ring diameters and width are shown in Table 2 ...
egg nebula - IOPscience
... well-defined boundary of this region beyond which the equatorial H2 emission manifests itself must then mark the transition of the 2 mm extinction, text(2 mm), from k1 to K1. The radius of this boundary, which is presumably intrinsically circular but appears elliptical because it is seen nearly edge ...
... well-defined boundary of this region beyond which the equatorial H2 emission manifests itself must then mark the transition of the 2 mm extinction, text(2 mm), from k1 to K1. The radius of this boundary, which is presumably intrinsically circular but appears elliptical because it is seen nearly edge ...
arXiv: 1106.2158
... 2.1 The echoes of inflation Models of inflation13 postulate that the universe underwent a period of extremely rapid expansion during its first moments, increasing in scale by a factor of &1025 in a mere ∼10−33 second. This massive expansion left the universe nearly spatially-flat and remarkably hom ...
... 2.1 The echoes of inflation Models of inflation13 postulate that the universe underwent a period of extremely rapid expansion during its first moments, increasing in scale by a factor of &1025 in a mere ∼10−33 second. This massive expansion left the universe nearly spatially-flat and remarkably hom ...
A Mach-Zehnder interferometer based on orbital angular momentum
... the residual central starlight is improved increasing the detection probability for off axis sources. This setup is a simplified version of the one proposed by P. Riaud13 where four Dove prisms are implied to correct the differential rotation and overcome possible wavefront aberrations. ...
... the residual central starlight is improved increasing the detection probability for off axis sources. This setup is a simplified version of the one proposed by P. Riaud13 where four Dove prisms are implied to correct the differential rotation and overcome possible wavefront aberrations. ...
Maxwell equation simulations of coherent optical photon emission from shock... * Evan J. Reed, Marin Soljačić,
... and vs is the shock speed. The factor of 5 provides scaling on  so that  = 1 approximately corresponds to a shock rise distance of 1 lattice unit. An analogous relation for ⍀̃ provides a variation of n共t兲 ⬅ 共␣ / V兲⍀̃n共t兲2 as a function of ⌬⍀̃ while ␣ / V is taken to be constant for simplicity. In ...
... and vs is the shock speed. The factor of 5 provides scaling on  so that  = 1 approximately corresponds to a shock rise distance of 1 lattice unit. An analogous relation for ⍀̃ provides a variation of n共t兲 ⬅ 共␣ / V兲⍀̃n共t兲2 as a function of ⌬⍀̃ while ␣ / V is taken to be constant for simplicity. In ...
T Tauri stars Optical lucky imaging polarimetry of HL and XZ Tau
... Blue denotes 70 µm, green 160 µm and red is the combination of all SPIRE bands; 250/350/500 µm. The wavelengths traces the dust in the molecular cloud and by following the red filaments in the image, which denotes colder regions, we see where stars are most likely to form. The structure is clearly f ...
... Blue denotes 70 µm, green 160 µm and red is the combination of all SPIRE bands; 250/350/500 µm. The wavelengths traces the dust in the molecular cloud and by following the red filaments in the image, which denotes colder regions, we see where stars are most likely to form. The structure is clearly f ...
Polarimetric evidence of a white dwarf pulsar in
... dwarf spin and the beat periods, are also consistent with this emission being produced in the white dwarf magnetosphere, which is additionally modulated at the binary period. The spectral energy distribution (SED) in AR Sco (2, 21) shows a Sν ∝ ν α1 (α1 ∼ 1.3) self-absorbed power law spectral distri ...
... dwarf spin and the beat periods, are also consistent with this emission being produced in the white dwarf magnetosphere, which is additionally modulated at the binary period. The spectral energy distribution (SED) in AR Sco (2, 21) shows a Sν ∝ ν α1 (α1 ∼ 1.3) self-absorbed power law spectral distri ...
Soft X-Ray Polarimetry
... have a magnetic field strong enough that there should be a proton cyclotron line at about 0.3 keV 7 . If so, this neutron star may be a “magnetar”. These unusual neutron stars are thought to be powered by the decay of enormous magnetic fields (1014 –1015 G). These fields are well above the quantum c ...
... have a magnetic field strong enough that there should be a proton cyclotron line at about 0.3 keV 7 . If so, this neutron star may be a “magnetar”. These unusual neutron stars are thought to be powered by the decay of enormous magnetic fields (1014 –1015 G). These fields are well above the quantum c ...
External reflections
... Today, we’ll show how they can be derived when we consider light to be an electromagnetic wave ...
... Today, we’ll show how they can be derived when we consider light to be an electromagnetic wave ...
The Science Case for SPICA Far
... polarimetry requires high signal-to-noise, the priority targets are likely to be brighter than ~10 MJy/sr, so the photon noise from the target itself is an important contributor. Here, we consider observations of targets as faint as 40 MJy/sr, which is estimated to correspond to regions with visual ...
... polarimetry requires high signal-to-noise, the priority targets are likely to be brighter than ~10 MJy/sr, so the photon noise from the target itself is an important contributor. Here, we consider observations of targets as faint as 40 MJy/sr, which is estimated to correspond to regions with visual ...
Multi-band Dual-Polarization Lens-coupled Planar
... number of detectors, assuming that each detector detects a single-mode to get the highest possible angular resolution. In the current EPIC-JPL concepts, for example, a combination of sufficient frequency bands and a high detector count are achieved using six 30 cm aperture telescopes with seven tota ...
... number of detectors, assuming that each detector detects a single-mode to get the highest possible angular resolution. In the current EPIC-JPL concepts, for example, a combination of sufficient frequency bands and a high detector count are achieved using six 30 cm aperture telescopes with seven tota ...
cosmic microwave background and foregrounds
... does not come from stars, but from the diffuse gas, either primordial and unprocessed, or ejected from stars through explosions The diffuse gas is composed by free electrons, ions, a variety of large molecules, also known as grains, such as silicates, … The galaxy is an hot system, 20 K or so, n ...
... does not come from stars, but from the diffuse gas, either primordial and unprocessed, or ejected from stars through explosions The diffuse gas is composed by free electrons, ions, a variety of large molecules, also known as grains, such as silicates, … The galaxy is an hot system, 20 K or so, n ...
samba2002v2
... radiation. Polarized X-rays have been obtained by Thompson scattering on a Li target of photons ...
... radiation. Polarized X-rays have been obtained by Thompson scattering on a Li target of photons ...
Zeeman observations: Measuring magnetic fields in the atomic and
... energies. Observationally, the resulting atomic and molecular transitions are partially circularly polarized. The circular polarized emission depends on the magnetic field strength along the line-of-sight and on the magnetic dipole moment. Only H I and molecules with an unpaired electron in the oute ...
... energies. Observationally, the resulting atomic and molecular transitions are partially circularly polarized. The circular polarized emission depends on the magnetic field strength along the line-of-sight and on the magnetic dipole moment. Only H I and molecules with an unpaired electron in the oute ...
Paper 3 (pdf)
... a strong magnetic field. Photons with E-vectors parallel to the magnetic field are impeded more than those with orthogonal E-vectors. The effect is small until the photon propagates through a distance sufficient to rotate the E-vector – ∼ 106 cm. The extent of polarized radiation from the surface of ...
... a strong magnetic field. Photons with E-vectors parallel to the magnetic field are impeded more than those with orthogonal E-vectors. The effect is small until the photon propagates through a distance sufficient to rotate the E-vector – ∼ 106 cm. The extent of polarized radiation from the surface of ...
PDF only - at www.arxiv.org.
... Already in his seminal paper about the unique counter-example to Schiff’s conjecture giving rise to CPR, Ni57 suggested that observations of polarized astrophysical sources could give constraints on the CPR. However, only in 1990, the polarization at radio wavelengths of RGs and quasars was used for ...
... Already in his seminal paper about the unique counter-example to Schiff’s conjecture giving rise to CPR, Ni57 suggested that observations of polarized astrophysical sources could give constraints on the CPR. However, only in 1990, the polarization at radio wavelengths of RGs and quasars was used for ...
Paper (pdf)
... 7◦ of 45◦ , so that the difference in s- and p-polarization reflectivity is maximized. As with the first concept, a multilayer coating on the mirror increases the 0.25 keV reflectivity to about 10% (depending on the surface roughness) and defines the bandwidth of the telescope. As shown in Figure 1 ...
... 7◦ of 45◦ , so that the difference in s- and p-polarization reflectivity is maximized. As with the first concept, a multilayer coating on the mirror increases the 0.25 keV reflectivity to about 10% (depending on the surface roughness) and defines the bandwidth of the telescope. As shown in Figure 1 ...
Polarization (waves)
Polarization (also polarisation) is a property of waves that can oscillate with more than one orientation. Electromagnetic waves such as light exhibit polarization, as do some other types of wave, such as gravitational waves. Sound waves in a gas or liquid do not exhibit polarization, since the oscillation is always in the direction the wave travels.In an electromagnetic wave, both the electric field and magnetic field are oscillating but in different directions; by convention the ""polarization"" of light refers to the polarization of the electric field. Light which can be approximated as a plane wave in free space or in an isotropic medium propagates as a transverse wave—both the electric and magnetic fields are perpendicular to the wave's direction of travel. The oscillation of these fields may be in a single direction (linear polarization), or the field may rotate at the optical frequency (circular or elliptical polarization). In that case the direction of the fields' rotation, and thus the specified polarization, may be either clockwise or counter clockwise; this is referred to as the wave's chirality or handedness.The most common optical materials (such as glass) are isotropic and simply preserve the polarization of a wave but do not differentiate between polarization states. However, there are important classes of materials classified as birefringent or optically active in which this is not the case and a wave's polarization will generally be modified or will affect propagation through it. A polarizer is an optical filter that transmits only one polarization.Polarization is an important parameter in areas of science dealing with transverse wave propagation, such as optics, seismology, radio, and microwaves. Especially impacted are technologies such as lasers, wireless and optical fiber telecommunications, and radar.