Results 11 to 20 of about 50 (49)

Simulating a Steady-state Heliosphere

The Astrophysical Journal Supplement Series
Ever since the discovery of the solar wind, it has been understood that our solar system resides within a bubble of solar wind plasma that originates from the Sun.
Jacob Heerikhuisen, Eric J. Zirnstein, Nikolai V. Pogorelov   +2 more
doaj   +1 more source

Constraining the Properties of the Multicomponent Local Interstellar Medium: MHD-kinetic Modeling Validated by Voyager and New Horizons Data

The Astrophysical Journal Letters
We introduce the first solar-cycle simulations from our 3D, global MHD-plasma/kinetic-neutrals model, where both hydrogen and helium atoms are treated kinetically, while electrons and helium ions are described as individual fluids.
Federico Fraternale, Nikolai V. Pogorelov, Ratan K. Bera   +2 more
doaj   +1 more source

Mapping Our Path through the Local Interstellar Medium: High-resolution Ultraviolet Absorption Spectroscopy of Sight Lines along the Sun’s Historical Trajectory

The Astrophysical Journal
Using high-resolution UV data obtained from the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, we focus on eight sight lines along the Sun’s historical trajectory to reconstruct the morphology of our most recent interstellar ...
Hunter Vannier, Seth Redfield, Brian E. Wood, Hans-Reinhard Müller, Jeffrey L. Linsky, Priscilla C. Frisch   +5 more
doaj   +1 more source

The Global Structure of the Heliosphere

The Astrophysical Journal
As the Sun moves through the local interstellar medium (LISM), it emits charged particles, creating the heliosphere occupied by the plasma of solar origin.
Nikolai V. Pogorelov, Federico Fraternale, Gary P. Zank, Ming Zhang   +3 more
doaj   +1 more source

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
doaj   +1 more source

Towards a Measurement of the Primordial Helium Isotope Ratio

The Astrophysical Journal
We report the discovery of two metastable neutral helium (He I *) absorbers in the Milky Way, and use the upgraded CRyogenic InfraRed Echelle Spectrograph (or CRIRES) on the Very Large Telescope to determine the helium isotope ratio, ^3 He/ ^4 He, along ...
Ryan J. Cooke, James W. Johnson, Pasquier Noterdaeme, Max Pettini, Louise Welsh, Aldric Wong, Céline Péroux   +6 more
doaj   +1 more source

Shocks, Compressible Perturbations, and Intermittency in the Very Local Interstellar Medium: Voyager 1 and 2 Observations and Numerical Modeling

The Astrophysical Journal
The Voyager spacecraft (V1 and V2) provide unique in situ measurements of perturbations propagating beyond the heliopause through the very local interstellar medium (VLISM), including the shocks and pressure fronts whose origin is debated. In particular,
Federico Fraternale, Nikolai V. Pogorelov, Ratan Bera, Leonard F. Burlaga, Maciej Bzowski   +4 more
doaj   +1 more source

An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST

The Astrophysical Journal
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the ...
Ruoyi Zhang, Haibo Yuan, Bowen Huang, Tao Wang, Lin Yang, Gregory M. Green, Xiangyu Zhang   +6 more
doaj   +1 more source

FEAST: Probing Hierarchical Star Formation with the Spatial Distributions of Young Star Clusters

The Astrophysical Journal
We apply the angular two-point correlation function (TPCF) to the spatial distributions of young star clusters (YSCs) in four nearby star forming galaxies (NGC 628, NGC 4449, M51, and M83) in order to investigate their underlying hierarchical structuring.
Drew Lapeer, Daniela Calzetti, Kathryn Grasha, Angela Adamo, Bruce G. Elmegreen, Arjan Bik, Giacomo Bortolini, Anne Buckner, Michele Cignoni, Matteo Correnti, Debra Meloy Elmegreen, H. Faustino Vieira, Max Hamilton, Kelsey Johnson, Thomas S.-Y. Lai, Sean T. Linden, Subhransu Maji, Matteo Messa, Göran Östlin, Alex Pedrini, E. Sabbi, Linda J. Smith   +21 more
doaj   +1 more source

DUALZ—Deep UNCOVER-ALMA Legacy High-Z Survey

The Astrophysical Journal Supplement Series
We present the survey design and initial results of the Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 9 program of DUALZ, which aims to establish a joint ALMA and JWST public legacy field targeting the massive galaxy cluster A2744.
Seiji Fujimoto, Rachel Bezanson, Ivo Labbe, Gabriel Brammer, Sedona H. Price, Bingjie Wang, John R. Weaver, Yoshinobu Fudamoto, Pascal A. Oesch, Christina C. Williams, Pratika Dayal, Robert Feldmann, Jenny E. Greene, Joel Leja, Katherine E. Whitaker, Adi Zitrin, Sam E. Cutler, Lukas J. Furtak, Richard Pan, Iryna Chemerynska, Vasily Kokorev, Tim B. Miller, Hakim Atek, Pieter van Dokkum, Stéphanie Juneau, Susan Kassin, Gourav Khullar, Danilo Marchesini, Michael Maseda, Erica J. Nelson, David J. Setton, Renske Smit   +31 more
doaj   +1 more source