Results 71 to 80 of about 705 (177)

First Resolution of a Main-sequence G star’s Astrosphere Using Chandra

The Astrophysical Journal
We report the resolution of a halo of X-ray line emission surrounding the zero-age main-sequence G8.5V star HD 61005 by Chandra/ACIS-S. Located only ∼36 pc distant, HD 61005 is young (100 ± 50 Myr) and X-ray bright (∼300 × solar), observed with a nearly ...
C. M. Lisse, S. J. Wolk, B. Snios, R. L. McNutt Jr., J. D. Slavin, R. A. Osten, D. C. Hines, J. H. Debes, D. Koutroumpa, V. Kharchenko, J. L. Linsky, P. Brandt, M. Horanyi, H. M. Günther, E. F. Guinan, S. Redfield, P. C. Frisch, K. Dennerl, V. Kashyap, K. G. Kislyakova, Y. R. Fernandez, E. Provornikova, M. A. MacGregor, C. H. Chen, L. Paxton, K. Dialynas, L. Gu   +26 more
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A Multifrequency Census of 100 Pulsars below 100 MHz with LWA: A Systematic Study of Flux Density, Spectra, Timing, Dispersion, Polarization, and Its Variation from a Decade of Observations

The Astrophysical Journal
We present a census of 100 pulsars, the largest below 100 MHz, including 94 normal pulsars and six millisecond pulsars, with the Long Wavelength Array (LWA).
P. Kumar, G. B. Taylor, K. Stovall, J. Dowell, S. M. White   +4 more
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Ionization Rate of Interstellar Neutral Helium from New Horizons/SWAP Observations

The Astrophysical Journal
Interstellar neutral (ISN) atoms enable studies of the physical conditions in the local interstellar medium surrounding the heliosphere. ISN helium, which is the most abundant species at 1 au, is directly observed by space missions, such as Interstellar ...
Małgorzata Antonik, Paweł Swaczyna, David J. McComas, Heather A. Elliott, Maciej Bzowski   +4 more
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Lyα Absorption in a “Croissant-like” Heliosphere

The Astrophysical Journal
Ly α absorption profiles have been used to detect astrospheres and heliospheric absorption from the hydrogen wall and heliotail. Using magnetohydrodynamic models of the heliosphere, we can compare simulated to observed Ly α profiles to probe the neutral ...
Erick Powell, Merav Opher, Marc Z. Kornbleuth, Igor Baliukin, Adam T. Michael, Brian E. Wood, Vladislav Izmodenov, Gabor Toth, Valeriy Tenishev   +8 more
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The Crab Nebula Revisited Using HST/WFC3

The Astrophysical Journal
It has been over 24 years since the iconic Crab Nebula has been visited by the high spatial resolution eye of the Hubble Space Telescope (HST). The expanding nebula is dynamic on these timescales, with many of the outer filaments of the nebula known to ...
William P. Blair, Ravi Sankrit, Dan Milisavljevic, Tea Temim, J. Martin Laming, Patrick Slane, Ziwei Ding, Thomas Martin   +7 more
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Strong Bow Shocks: Turbulence and an Exact Self-similar Asymptotic

The Astrophysical Journal
We show that strong bow shocks are turbulent and nonuniversal near the head but asymptote to a universal, steady, self-similar, and analytically solvable flow in the downstream.
Marcus DuPont, Andrei Gruzinov, Andrew MacFadyen   +2 more
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The Role of Pickup Ions in the Interaction of the Solar Wind with the Local Interstellar Medium. II. Effects of Solar Cycle

The Astrophysical Journal
We investigate the role of pickup ions (PUIs) in the interaction of a periodically varying solar wind (SW) with the local interstellar medium (LISM).
R. K. Bera, F. Fraternale, N. V. Pogorelov, V. Roytershteyn, M. Gedalin, G. P. Zank   +5 more
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Anisotropic Diffusion in Pulsar Halos: Interpreting the Asymmetric Morphology of Geminga and Monogem Halos Measured by HAWC

The Astrophysical Journal
Pulsar halos are produced by electrons and positrons diffusing in the interstellar medium around their parent pulsar wind nebulae. Recent observations by High Altitude Water Cherenkov Observatory and Large High Altitude Air Shower Observatory have ...
Si-Zhe Wu, Chao-Ming Li, Ruo-Yu Liu
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Interpretation of the IBEX-Lo Observations of Energetic Neutral Atoms along the Voyager Trajectories

The Astrophysical Journal Letters
This Letter addresses a long-standing discrepancy between simulated energetic neutral atom (ENA) fluxes and Interstellar Boundary Explorer (IBEX) observations in the ∼0.02–0.1 keV energy range.
Federico Fraternale, Ratan Bera, Nikolai V. Pogorelov, Eric J. Zirnstein, Vadim Roytershteyn   +4 more
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Astrospheres and Solar-like Stellar Winds

Living Reviews in Solar Physics, 2004
Stellar analogs for the solar wind have proven to be frustratingly difficult to detect directly. However, these stellar winds can be studied indirectly by observing the interaction regions carved out by the collisions between these winds and the ...
Wood Brian E.
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