Catálogo de publicaciones - revistas
Título de Acceso Abierto
The Astrophysical Journal (ApJ)
Resumen/Descripción – provisto por la editorial en inglés
The Astrophysical Journal is an open access journal devoted to recent developments, discoveries, and theories in astronomy and astrophysics. Publications in ApJ constitute significant new research that is directly relevant to astrophysical applications, whether based on observational results or on theoretical insights or modeling.Palabras clave – provistas por la editorial
astronomy; astrophysics
Disponibilidad
| Institución detectada | Período | Navegá | Descargá | Solicitá |
|---|---|---|---|---|
| No detectada | desde jul. 1995 / hasta dic. 2023 | IOPScience |
Información
Tipo de recurso:
revistas
ISSN impreso
0004-637X
ISSN electrónico
1538-4357
Editor responsable
American Astronomical Society (AAS)
Idiomas de la publicación
- inglés
País de edición
Reino Unido
Información sobre licencias CC
Cobertura temática
Tabla de contenidos
Local Regimes of Turbulence in 3D Magnetic Reconnection
G. Lapenta
; F. Pucci; M. V. Goldman; D. L. Newman
<jats:title>Abstract</jats:title> <jats:p>The process of magnetic reconnection when studied in nature or when modeled in 3D simulations differs in one key way from the standard 2D paradigmatic cartoon: it is accompanied by many fluctuations in the electromagnetic fields and plasma properties. We developed a diagnostics to study the spectrum of fluctuations in the various regions around a reconnection site. We define the regions in terms of the local value of the flux function that determines the distance from the reconnection site, with positive values in the outflow and negative values in the inflow. We find that fluctuations belong to two very different regimes depending on the local plasma beta (defined as the ratio of plasma and magnetic pressures). The first regime develops in the reconnection outflows where beta is high and it is characterized by a strong link between plasma and electromagnetic fluctuations, leading to momentum and energy exchanges via anomalous viscosity and resistivity. But there is a second, low-beta regime: it develops in the inflow and in the region around the separatrix surfaces, including the reconnection electron diffusion region itself. It is remarkable that this low-beta plasma, where the magnetic pressure dominates, remains laminar even though the electromagnetic fields are turbulent.</jats:p>
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 104
Distortion of Magnetic Fields in a Starless Core. VI. Application of Flux Freezing Model and Core Formation of FeSt 1–457
Ryo Kandori; Kohji Tomisaka; Masao Saito; Motohide Tamura; Tomoaki Matsumoto; Ryo Tazaki; Tetsuya Nagata; Nobuhiko Kusakabe; Yasushi Nakajima; Jungmi Kwon; Takahiro Nagayama; Ken’ichi Tatematsu
<jats:title>Abstract</jats:title> <jats:p>Observational data for the hourglass-like magnetic field toward the starless dense core FeSt 1–457 were compared with a flux freezing magnetic field model. Fitting of the observed plane-of-sky magnetic field using the flux freezing model gave a residual angle dispersion comparable to the results based on a simple 3D parabolic model. The best-fit parameters for the flux freezing model were a line-of-sight magnetic inclination angle of <jats:italic>γ</jats:italic> <jats:sub>mag</jats:sub> = 35° ± 15° and a core center to ambient (background) density contrast of <jats:italic>ρ</jats:italic> <jats:sub>c</jats:sub>/<jats:italic>ρ</jats:italic> <jats:sub>bkg</jats:sub> = 75. The initial density for core formation (<jats:italic>ρ</jats:italic> <jats:sub>0</jats:sub>) was estimated to be <jats:italic>ρ</jats:italic> <jats:sub>c</jats:sub>/75 = 4670 cm<jats:sup>−3</jats:sup>, which is about one order of magnitude higher than the expected density (∼300 cm<jats:sup>−3</jats:sup>) for the interclump medium of the Pipe Nebula. FeSt 1–457 is likely to have been formed from the accumulation of relatively dense gas, and the relatively dense background column density of <jats:italic>A</jats:italic> <jats:sub> <jats:italic>V</jats:italic> </jats:sub> ≃ 5 mag supports this scenario. The initial radius (core formation radius) <jats:italic>R</jats:italic> <jats:sub>0</jats:sub> and the initial magnetic field strength <jats:italic>B</jats:italic> <jats:sub>0</jats:sub> were obtained to be 0.15 pc (1.64<jats:italic>R</jats:italic>) and 10.8–14.6 <jats:italic>μ</jats:italic>G, respectively. We found that the initial density <jats:italic>ρ</jats:italic> <jats:sub>0</jats:sub> is consistent with the mean density of the nearly critical magnetized filament with magnetic field strength <jats:italic>B</jats:italic> <jats:sub>0</jats:sub> and radius <jats:italic>R</jats:italic> <jats:sub>0</jats:sub>. The relatively dense initial condition for core formation can be naturally understood if the origin of the core is the fragmentation of magnetized filaments.</jats:p>
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 120
Hot Super-Earths with Hydrogen Atmospheres: A Model Explaining Their Paradoxical Existence
Darius Modirrousta-Galian; Daniele Locci; Giovanna Tinetti; Giuseppina Micela
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 87
A Variant Stellar-to-nebular Dust Attenuation Ratio on Subgalactic and Galactic Scales
Zesen Lin; Xu Kong
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 88
Discovery of Protoclusters at z ∼ 3.7 and 4.9: Embedded in Primordial Superclusters
Jun Toshikawa; Matthew A. Malkan; Nobunari Kashikawa; Roderik Overzier; Hisakazu Uchiyama; Kazuaki Ota; Shogo Ishikawa; Kei Ito
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 89
Rapid Postshock Cooling and Pressure-driven Shell-phase Evolution of the Galactic Halo SNR G70.0–21.5
J. C. Raymond; N. Caldwell; R. A. Fesen; K. E. Weil; P. Boumis; D. di Cicco; D. Mittelman; S. Walker
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 90
PUSHing Core-collapse Supernovae to Explosions in Spherical Symmetry. IV. Explodability, Remnant Properties, and Nucleosynthesis Yields of Low-metallicity Stars
Kevin Ebinger; Sanjana Curtis; Somdutta Ghosh; Carla Fröhlich; Matthias Hempel; Albino Perego; Matthias Liebendörfer; Friedrich-Karl Thielemann
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 91
Star-forming Clumps in Local Luminous Infrared Galaxies
K. L. Larson; T. Díaz-Santos; L. Armus; G. C. Privon; S. T. Linden; A. S. Evans; J. Howell; V. Charmandaris; V. U; D. B. Sanders; S. Stierwalt; L. Barcos-Muñoz; J. Rich; A. Medling; D. Cook; A. Oklopĉić; E. J. Murphy; P. Bonfini
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 92
Time-varying Extinction, Polarization, and Colors of Type Ia Supernovae due to Rotational Disruption of Dust Grains
Nguyen Chau Giang; Thiem Hoang; Le Ngoc Tram
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 93
Covariant Radiative Transfer for Black Hole Spacetimes
Shane W. Davis; Charles F. Gammie
Palabras clave: Space and Planetary Science; Astronomy and Astrophysics.
Pp. 94