Results 111 to 120 of about 39,097 (209)
Probing the Interstellar Medium from Scintillation of the Swooshing Pulsar B0919+06
The Astrophysical JournalRadio observations of pulsars offer a potential method to probe the intricate microstructure in the turbulent interstellar medium. Here we report on a high-resolution dynamic spectral analysis of the “swooshing pulsar” B0919+06 observed with the Five ...
Z. Wang +12 more
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Sensitivity of Polarization to Grain Shape. II. Aggregates
The Astrophysical JournalA previous study (Paper I) investigated the polarization properties of a variety of simple convex grain shapes, some of which were found to be consistent with the observed polarization properties of interstellar dust from far-ultraviolet to far-infrared.
B. T. Draine
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Tidal Disruption of “Snow Clouds” by Unassociated Stars
The Astrophysical JournalIt has been suggested that star-forming galaxies may host a substantial, dark reservoir of gas in the form of planetary-mass molecular clouds that are so cold that H _2 can condense.
Arthur G. Suvorov, Mark A. Walker
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The Spheroidal Analog Method for Modeling Irregular Porous Aggregates
The Astrophysical JournalIt is shown that the optical properties of an irregular porous grain with effective radius a _eff ≲ 3 λ (where λ is the wavelength) can be well approximated by a “spheroidal analog”: a spheroid with appropriate axial ratio and size, with a dielectric ...
B. T. Draine
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Interstellar X-ray Absorption and Scattering
Accurate estimates of the absorption of X-rays by interstellar gas and dust are of crucial importance for the analysis and interpretation of almost all astronomical soft X-ray observations. However, the present X-ray absorption data extensively used by the community were derived from a reduced interstellar abundance (~70% of solar) and ignoring dust ...
Yan, Linli, Li, Aigen, Lu, Fangjun
openaire +2 more sources
Scintillation Bandwidth Measurements from 23 Pulsars from the AO327 Survey
The Astrophysical JournalA pulsar’s scintillation bandwidth is inversely proportional to the scattering delay, making accurate measurements of scintillation bandwidth critical to characterize unmitigated delays in efforts to measure low-frequency gravitational waves with pulsar ...
Sofia Sheikh +17 more
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An Anisotropic Plasma Model of the Heliospheric Interface
The Astrophysical JournalWe present a pioneering model of the interaction between the solar wind and the surrounding interstellar medium that includes the possibility of different pressures in directions parallel and perpendicular to the magnetic field.
Vladimir Florinski +6 more
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The Astrophysical Journal LettersWe report the first unambiguous detection of refractive substructure in an active galactic nucleus (AGN) using ground-based very long baseline interferometry (VLBI).
A. V. Plavin +2 more
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Frontiers in Astronomy and Space SciencesCollisional excitation in reactive systems plays a central role in astrochemistry. Accurate state-to-state rate coefficients are key parameter for the determination of excitation conditions of interstellar molecules with the most abundant species in ...
Paul Pirlot Jankowiak
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