118 citations · 932 across the 26 of their papers we have counts for
18 papers · 1 filter
CMBPol Mission Concept Study: Foreground Science Knowledge and Prospects
A. A. Fraisse, J. -A. C. Brown, G. Dobler +10
We report on our knowledge of Galactic foregrounds, as well as on how a CMB satellite mission aiming at detecting a primordial B-mode signal (CMBPol) will contribute to improving i…
Polarized Microwave Emission from Dust
A. Lazarian, S. Prunet
Polarized emission from dust is an important foreground that can hinder the progress in polarized CMB studies unless carefully accounted for. We discuss potential difficulties asso…
Resonance Paramagnetic Relaxation and Alignment of Small Grains
A. Lazarian, B. T. Draine
We show that the energy-level splitting arising from grain rotation ensures that paramagnetic dissipation acts at its maximum rate, i.e., the conditions for paramagnetic resonance…
Physics of Grain Alignment
Lazarian A
Aligned grains provide one of the easiest ways to study magnetic fields in diffuse gas and molecular clouds. How reliable our conclusions about the inferred magnetic field depends…
Nuclear Spin Relaxation within Interstellar Grains
A. Lazarian, B. T. Draine
We identify a new mechanism of internal dissipation of rotational kinetic energy in spinning dust grains, arising from the reorientation of nuclear angular momentum, e.g., spins of…
Thermal Flipping and Thermal Trapping -- New Elements in Dust Grain Dynamics
A. Lazarian, B. Draine
Since the classical work by Purcell (1979) it has been generally accepted that most interstellar grains rotate suprathermally. Suprathermally rotating grains would be nearly perfec…
Davis-Greenstein alignment of oblate spheroidal grains
W. G. Roberge, A. Lazarian
We present extensive calculations on the efficiency of grain alignment by the Davis-Greenstein mechanism. We model the grains as oblate spheroids with arbitrary axis ratios. Our de…
Turbulent Cooling Flows in Molecular Clouds
P. Myers, A. Lazarian
We propose that inward, subsonic flows arise from the local dissipation of turbulent motions in molecular clouds. Such "turbulent cooling flows" may account for recent observations…
Reconnection in the ISM
Ethan T. Vishniac, A. Lazarian
We discuss the role of ambipolar diffusion for simple reconnection in a partially ionized gas, following the reconnection geometry of Parker and Sweet. When the recombination time…
On the efficiency of grain alignment in dark clouds
A. Lazarian, Alyssa A. Goodman, Philip C. Myers
A quantitative analysis of grain alignment in the filamentary dark cloud L1755 in Ophiuchus is presented. We show, that the observed decrease of the polarization to extinction rati…
Cosmic rays and grain alignment
A. Lazarian, W. G. Roberge
The recent detection of interstellar polarization in the solid CO feature near 4.67 micron shows that CO-mantled grains can be aligned in cold molecular clouds. These observations…
Barnett Relaxation in Thermally-Rotating Grains
A. Lazarian, W. G. Roberge
We present an exact formulation of the physics of Barnett relaxation. Our formulation is based on a realistic kinetic model of the relaxation mechanism which includes the alignment…
Paramagnetic alignment of thermally rotating dust
A. Lazarian
Paramagnetic alignment of thermally rotating oblate dust grains is studied analytically for finite ratios of grain to gas temperatures. For such ratios, the alignment of angular mo…
Gold alignment & internal dissipation
A. Lazarian
The measures of mechanical alignment were obtained for both prolate and oblate grains when their temperature is comparable with grain kinetic energy devided by k, the Boltzmann con…
Disorientation of Suprathermally Rotating Grains and Grain Alignment Problem
A. Lazarian, B. T. Draine
We discuss the dynamics of dust grains subjected to uncompensated torques arising from H_2 formation. In particular, we discuss grain dynamics when a grain spins down and goes thro…
Interstellar Filaments and the Statistics of Galactic HI
Alex Lazarian, Dmitri Pogosyan
This paper presents a statistical explanation of filament formation in the galactic atomic hydrogen. Recently developed technique allows to determine the 3D spectrum of random HI d…
Mechanical alignment of suprathermally rotating grains
A. Lazarian
It is shown that mechanical alignment of grains can be efficient for grains rotating suprathermally, i.e. with kinetic energy substantially exceeding (the Boltzmann constant) o…
GRAIN ALIGNMENT IN THE TAURUS DARK CLOUD
P. A. Gerakines, D. C. B. Whittet
Variations in polarization efficiency (p/A) of interstellar grains as a function of environment place vital constraints on models for the mechanism of their alignment. We use polar…