Results 21 to 30 of about 308 (201)
On the source of dense outflows from T Tauri stars - II. Warm disc winds [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 Recent ultraviolet (UV) observations suggest that there is a hot (T(e)similar or equal to 80 000 K) and dense (Ne similar or equal to 10(10) cm(-3)) wind associated with the large-scale jets observed in classical T Tauri stars (cTTSs). The observations of these rather evolved sources cannot be fitted with the classical cold disc wind solutions. This is
Ana I. Gómez de Castro +1 more
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Ubiquitous Molecular Outflows in z > 4 Massive, Dusty Galaxies. II. Momentum-driven Winds Powered by Star Formation in the Early Universe [PDF]
The Astrophysical Journal, 2020 Abstract Galactic outflows of molecular gas are a common occurrence in galaxies and may represent a mechanism by which galaxies self-regulate their growth, redistributing gas that could otherwise have formed stars. We previously presented the first survey of molecular outflows at z > 4 toward a sample of massive, dusty galaxies.
Justin S. Spilker +15 more
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Accretion, winds and outflows in young stars [PDF]
Astronomische Nachrichten, 2013 AbstractYoung stars and planetary systems form in molecular clouds. After the initial radial infall an accretion disk develops. For classical T Tauri stars (CTTS, F‐K type precursors) the accretion disk does not reach down to the central star, but it is truncated near the co‐rotation radius by the stellar magnetic field.
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Jet‐ and Wind‐driven Ionized Outflows in the Superbubble and Star‐forming Disk of NGC 3079 [PDF]
The Astrophysical Journal, 2001 HST WFPC2 images are presented that span the inner 19 kpc diameter of the edge-on spiral galaxy NGC 3079; they are combined with ground-based Halpha+[N II] Fabry-Perot spectra and VLA images of radio polarization vectors and rotation measures. Ionized gas filaments within 9 kpc diameter project ~3 kpc above the disk, with the brightest forming the 1 ...
Cecil, G. +3 more
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Winds in late-type stars: Mechanisms of mass outflow [PDF]
International Astronomical Union Colloquium, 1981 AbstractFour basic mechanisms have been proposed to explain the acceleration of winds in late-type stars –– thermal pressure gradients, radiation pressure on circumstellar dust grains, momentum addition by Alfvén waves, and momentum addition by periodic shock waves.
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The Astrophysical Journal, 2022 Abstract Massive protostars attain high luminosities as they are actively accreting and the radiation pressure exerted on the gas in the star’s atmosphere may launch isotropic high-velocity winds. These winds will collide with the surrounding gas producing shock-heated (T ∼ 107 K) tenuous gas that adiabatically expands and pushes on the ...
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Dust in the Wind: Composition and Kinematics of Galaxy Outflows at the Peak Epoch of Star Formation [PDF]
The Astrophysical Journal, 2018 Abstract Galactic-scale outflows regulate the stellar mass growth and chemical enrichment of galaxies, yet key outflow properties such as the chemical composition and mass-loss rate remain largely unknown. We address these properties with Keck/ESI echellete spectra of nine gravitationally lensed z ≃ 2–3 star-forming galaxies, probing a ...
Tucker Jones +2 more
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On the source of dense outflows from T Tauri stars -- I. Photoionization of cool MHD disc winds [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 Cool magnetohydrodynamics (MHD) disc wind physics is reviewed by means of a self-similar analytical model, putting special emphasis on the mathematical aspects of the solution. It is found that the key parameter of the theory (mu) measures the relation between magnetic and tidal forces. The generation of MHD winds from accretion discs requires a subtle
C. Ferro-Fontan, A. I. Gomez de Castro
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CO Outflows from Young Stars: Confronting the Jet and Wind Models
The Astrophysical Journal, 2000 We have mapped the CO J = 1-0 emission from molecular outflows associated with five young stellar systems of class 0 to class II/III using the BIMA array and the FCRAO 14 m antenna. The systems, VLA 05487, HH 212, HH 240/241, HH 111, and RNO 91, are all relatively nearby and of low luminosity, and the majority have H2 emission or optical jet features ...
Chin‐Fei Lee +4 more
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The Astrophysical Journal, 2023 Abstract Kinematic signatures of the jet, winds, multicavities, and episodic shells arising in the unified model of bipolar outflows developed in Shang et al. (Paper I), in which an outflow forms by radially directed, wide-angle toroidally magnetized winds interacting with magnetized isothermal toroids, are extracted in the form of ...
Hsien 賢 Shang 尚 +3 more
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