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Готові списки джерел за темами / Protostellar outflows

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Добірка наукової літератури з теми "Protostellar outflows"

Автор: Grafiati

Опубліковано: 8 червня 2024

Оновлено: 31 липня 2025

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Статті в журналах з теми "Protostellar outflows"

1

Takaishi 髙石, Daisuke 大輔, Yusuke 裕介 Tsukamoto 塚本, Miyu 未宇 Kido 城戸, et al. "Formation of Unipolar Outflow and Protostellar Rocket Effect in Magnetized Turbulent Molecular Cloud Cores." Astrophysical Journal 963, no. 1 (2024): 20. http://dx.doi.org/10.3847/1538-4357/ad187a.

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Abstract Observed protostellar outflows exhibit a variety of asymmetrical features, including remarkable unipolar outflows and bending outflows. Revealing the formation and early evolution of such asymmetrical protostellar outflows, especially the unipolar outflows, is essential for a better understanding of the star and planet formation because they can dramatically change the mass accretion and angular momentum transport to the protostars and protoplanetary disks. Here we perform three-dimensional nonideal magnetohydrodynamics simulations to investigate the formation and early evolution of t

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2

Nakamura, Fumitaka, and Zhi-Yun Li. "Protostellar turbulence in cluster forming regions of molecular clouds." Proceedings of the International Astronomical Union 2, S237 (2006): 306–10. http://dx.doi.org/10.1017/s1743921307001640.

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AbstractWe perform 3D MHD simulations of cluster formation in turbulent magnetized dense molecular clumps, taking into account the effect of protostellar outflows. Our simulation shows that initial interstellar turbulence decays quickly as several authors already pointed out. When stars form, protostellar outflows generate and maintain supersonic turbulence that have a power-law energy spectrum of Ek ~ k−2, which is somewhat steeper than those of driven MHD turbulence simulations. Protostellar outflows suppress global star formation, although they can sometimes trigger local star formation by

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3

Skretas, I. M., and L. E. Kristensen. "Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies." Astronomy & Astrophysics 660 (April 2022): A39. http://dx.doi.org/10.1051/0004-6361/202141944.

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Context. Molecular outflows are commonly detected originating from both protostellar and extragalactic sources. Separate studies of low-mass, isolated high-mass, and extragalactic sources reveal scaling relations connecting the force carried by an outflow and the properties of the source that drives it, as for example the mass and luminosity. Aims. The aim of this work is twofold: first, to examine the effects, if any, of clustered star formation on the protostellar outflows and their scaling relations and, second, to explore the possibility that outflows varying in scale and energetics by man

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4

Bally, John. "Protostellar Outflows." Annual Review of Astronomy and Astrophysics 54, no. 1 (2016): 491–528. http://dx.doi.org/10.1146/annurev-astro-081915-023341.

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5

Lin, Shuping. "Protostellar Outflows." Highlights in Science, Engineering and Technology 61 (July 30, 2023): 206–14. http://dx.doi.org/10.54097/hset.v61i.10297.

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The formation of massive stars differs from low-mass stars due to their rapid evolution, relatively low abundance, and their burial within molecular clouds, making observations more challenging. Moreover, the mechanisms give rise to the formation of O-type and B-type stars, in particular, differ from those responsible for the formation of low-mass stars. The paper presents an overview of the two main theories that have been proposed to explain the formation of massive stars: accretion and collision theories. The paper also investigates several mainstream theories of protostellar outflows durin

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6

Gómez-Ruiz, A. I., A. Gusdorf, S. Leurini, et al. "Warm gas in protostellar outflows." Astronomy & Astrophysics 629 (September 2019): A77. http://dx.doi.org/10.1051/0004-6361/201424156.

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Context. OMC-2/3 is one of the nearest embedded cluster-forming regions that includes intermediate-mass protostars at early stages of evolution. A previous CO (3–2) mapping survey towards this region revealed outflow activity related to sources at different evolutionary phases. Aims. The present work presents a study of the warm gas in the high-velocity emission from several outflows found in CO (3–2) emission by previous observations, determines their physical conditions, and makes a comparison with previous results in low-mass star-forming regions. Methods. We used the CHAMP+ heterodyne arra

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7

Nony, T., F. Motte, F. Louvet, et al. "Episodic accretion constrained by a rich cluster of outflows." Astronomy & Astrophysics 636 (April 2020): A38. http://dx.doi.org/10.1051/0004-6361/201937046.

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Context. The accretion history of protostars remains widely mysterious, even though it represents one of the best ways to understand the protostellar collapse that leads to the formation of stars. Aims. Molecular outflows, which are easier to detect than the direct accretion onto the prostellar embryo, are here used to characterize the protostellar accretion phase in W43-MM1. Methods. The W43-MM1 protocluster hosts a sufficient number of protostars to statistically investigate molecular outflows in a single, homogeneous region. We used the CO(2–1) and SiO(5–4) line datacubes, taken as part of

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8

Tokuda, Kazuki, Sarolta Zahorecz, Yuri Kunitoshi, et al. "The First Detection of a Protostellar CO Outflow in the Small Magellanic Cloud with ALMA." Astrophysical Journal Letters 936, no. 1 (2022): L6. http://dx.doi.org/10.3847/2041-8213/ac81c1.

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Abstract Protostellar outflows are one of the most outstanding features of star formation. Observational studies over the last several decades have successfully demonstrated that outflows are ubiquitously associated with low- and high-mass protostars in solar-metallicity Galactic conditions. However, the environmental dependence of protostellar outflow properties is still poorly understood, particularly in the low-metallicity regime. Here we report the first detection of a molecular outflow in the Small Magellanic Cloud with 0.2 Z ⊙, using Atacama Large Millimeter/submillimeter Array observati

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9

Rohde, P. F., S. Walch, D. Seifried, A. P. Whitworth, and S. D. Clarke. "Protostellar outflows: a window to the past." Monthly Notices of the Royal Astronomical Society 510, no. 2 (2021): 2552–71. http://dx.doi.org/10.1093/mnras/stab3572.

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ABSTRACT During the early phases of low-mass star formation, episodic accretion causes the ejection of high-velocity outflow bullets, which carry a fossil record of the driving protostar’s accretion history. We present 44 SPH simulations of $1\, {{\mathrm{M}}}_{\odot }$ cores, covering a wide range of initial conditions, and follow the cores for five free-fall times. Individual protostars are represented by sink particles, and the sink particles launch episodic outflows using a sub-grid model. The Optics algorithm is used to identify individual episodic bullets within the outflows. The paramet

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10

Myers, Philip C., Michael M. Dunham, and Ian W. Stephens. "Can Protostellar Outflows Set Stellar Masses?" Astrophysical Journal 949, no. 1 (2023): 19. http://dx.doi.org/10.3847/1538-4357/acca74.

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Abstract The opening angles of some protostellar outflows appear too narrow to match the expected core–star mass efficiency (SFE) = 0.3–0.5, if the outflow cavity volume traces outflow mass, with a conical shape and a maximum opening angle near 90°. However, outflow cavities with a paraboloidal shape and wider angles are more consistent with observed estimates of the SFE. This paper presents a model of infall and outflow evolution based on these properties. The initial state is a truncated singular isothermal sphere which has mass ≈ 1 M ⊙, freefall time ≈ 80 kyr, and small fractions of magneti

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Більше джерел

Дисертації з теми "Protostellar outflows"

1

Khanzadyan, T. "The near-infrared tracks of protostellar outflows." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273151.

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2

Walawender, Joshua Michael. "Quantifying the role of protostellar outflows in star formation feedback." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3207734.

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3

Reiter, Megan Ruth. "Measuring the Physical Properties of Protostellar Outflows from Intermediate-Mass Stars in Feedback-Dominated Regions." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/560846.

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We present new spectroscopy and Hubble Space Telescope imaging of protostellar jets discovered in an Hαsurvey of the Carina Nebula. Near-IR [Fe II] emission from these jets traces dense gas that is self-shielded from Lyman continuum photons from nearby O-type stars, but is excited by non-ionizing FUV photons that penetrate the ionization front within the jet. New near-IR [Fe II] images reveal a substantial mass of dense, neutral gas that is not seen in Hαemission from these jets. In some cases, [Fe II] emission traces the jet inside its natal dust pillar, connecting the larger Hαoutflow to the

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4

Stanke, Thomas. "An unbiased infrared H₂ search for embedded flows from young stars in Orion A." Phd thesis, Universität Potsdam, 2000. http://opus.kobv.de/ubp/volltexte/2005/20/.

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Gasausströmungen, oft in der Form hoch kollimierter Jets, sind ein allgegenwärtiges Phänomen bei der Geburt neuer Sterne. Emission von stossangeregtem molekularem Wasserstoff bei Wellenlängen im nahen Infrarotbereich ist ein Merkmal ihrer Existenz und auch in eingebetteten, im Optischen obskurierten Ausströmungen generell gut zu beobachten. In dieser Arbeit werden die Resultate einer von Auswahleffekten freien, empfindlichen, grossflächigen Suche nach solchen Ausströmungen von Protosternen in der v=1-0 S(1) Linie molekularen Wasserstoffs bei einer Wellenlänge von 2.12 µm vorgestellt. Die Durch

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5

Valeille-Manet, Maxime. "Recherche et étude des phases précoces de la formation des étoiles massives." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0202.

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L’étude des phases précoces de la formation des étoiles massives (M>8Msol) est un sujet majeur de l’astrophysique encore mal compris. Pour élucider les processus précis de formation en action, il est vital d'identifier et d’étudier les plus phases les plus précoces de la formation, avant même la naissance d’une proto-étoile. Ces objets dits cœurs préstellaires permettent d’observer directement les processus à l’œuvre. Grâce au relevé ALMA-IMF, nous avons pu pour la première fois construire un échantillon de cœurs préstellaires massifs découverts de façon homogène dans un seul relevé. Cela n

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6

Rabenanahary, Mialy Rabetanety. "Flots protostellaires poussés par un jet dans une enveloppe stratifiée : revisiter un modèle à l'ère d'ALMA." Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLO014.

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L’efficacité observée dans la formation des étoiles jusqu’au parsec ne dépasse pas quelques pourcents, sans oublier le décalage de la fonction initiale de masse (IMF) à seulement ∼30% de la masse du cœur pré-stellaire initial. Comprendre en détail le processus derrière d’aussi faibles efficacités reste encore à ce jour une question ouverte. En outre, les simulations numériques les plus récentes ont démontré que la turbulence et les champs magnétiques à eux seuls ne peuvent suffire à reproduire de telles valeurs. Elles montrent que la rétroaction des flots protostellaires joue un rôle crucial e

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7

Grieco, Francesco. "Identification of specific molecular species and investigation of their distribution around two deeply embedded protostars (IRAS 16293-2422) observed with ALMA." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12189/.

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In this project I have worked with high spatial and spectral resolution data on the protostellar binary system IRAS 16293-2422 obtained with Atacama Large Millimeter-submillimeter Array (ALMA). I focused in particular on one of the two sources, IRAS 16293A, which is a Class 0 protostar. IRAS 16293A has a much more complicated structure than its companion, it has indeed two outflows, along NE-SW and E-W directions, and the continuum emission appears to be one at sub-mm wavelengths but split into two at mm and cm wavelengths. Line emission toward this source is also characterized by FWHMs much h

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Частини книг з теми "Protostellar outflows"

1

Bachiller, Rafael. "Molecular Outflows: Observations." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_46.

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2

Froebrich, Dirk, Michael D. Smith, and Jochen EislÖFfel. "Shocks in Protostellar Outflows." In Jets in Young Stellar Objects. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-0999-7_36.

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3

Whelan, Emma M., Tom Ray, Francesca Bacciotti, Sofia Randich, and Antonella Natta. "Searching for Brown Dwarf Outflows." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_31.

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4

Downes, Turlough P. "Driving Mechanisms for Molecular Outflows." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_47.

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5

López-Sepulcre, Ana, Claudio Codella, Riccardo Cesaroni, Maite T. Beltrán, Nuria Marcelino, and Luca Moscadelli. "Outflows in High-Mass Star Forming Regions." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_77.

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6

Stecklum, Bringfried, Alessio Caratti o Garatti, Chris Davis, Hendrik Linz, Thomas Stanke, and Hans Zinnecker. "Verification of Candidate Protostellar Outflows in GLIMPSE." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_94.

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7

Rawlings, J. M. C., J. E. Drew, and M. J. Barlow. "Excited Hydrogen Chemistry in Protostellar Outflows." In Astrochemistry of Cosmic Phenomena. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2761-5_89.

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8

Nomura, Hideko, and Tom J. Millar. "Chemical Models of Hot Molecules at Shocks in Outflows." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_85.

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9

Salmeron, Raquel. "MRI and Outflows: Angular Momentum Transport in Protoplanetary Disks." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_92.

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10

Romanova, Marina M., Galina V. Ustyugova, Alexander V. Koldoba, and Richard V. E. Lovelace. "Disk-Magnetosphere Interaction and Outflows: Conical Winds and Axial Jets." In Protostellar Jets in Context. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00576-3_19.

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Тези доповідей конференцій з теми "Protostellar outflows"

1

Zinchenko, I. I. "Protostellar jets and outflows." In 51-st All-Russian with international participation student scientific conference "Physics of Space". Ural University Press, 2024. http://dx.doi.org/10.15826/b978-5-7996-3848-1.04.

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This review describes bipolar protostellar highly collimated fast ionized jets and slower molecular outflows. Jets and outflows play a crucial role in the process of star formation, carrying away excess angular momentum from the system, without which star formation would simply be impossible. The main observational characteristics of these phenomena are given and the main models of their formation are described.

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2

Arce, Héctor. "SHOCKS AND MOLECULES IN PROTOSTELLAR OUTFLOWS." In 69th International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2014. http://dx.doi.org/10.15278/isms.2014.rf09.

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3

Segura-Cox, Dominique, and Leslie Looney. "THE CO AND SIO PROTOSTELLAR OUTFLOWS OF 30 PROTOSTARS." In 69th International Symposium on Molecular Spectroscopy. University of Illinois at Urbana-Champaign, 2014. http://dx.doi.org/10.15278/isms.2014.rf08.

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4

Bachiller, Rafael, Jean-Francois Desmurs, Claudio Codella, J. Santiago-Garcia, and M. Tafalla. "AU-scale collimation of protostellar outflows from water masers." In 8th European VLBI Network Symposium. Sissa Medialab, 2007. http://dx.doi.org/10.22323/1.036.0065.

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5

Nakamura, Fumitaka, and Zhi-Yun Li. "Present-day star formation: Protostellar outflows and clustered star formation." In FIRST STARS IV – FROM HAYASHI TO THE FUTURE –. AIP, 2012. http://dx.doi.org/10.1063/1.4754324.

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Tanatova, P. A., and S. V. Salii. "Study of the molecular composition of the high mass protostellar object S255IR." In 51-st All-Russian with international participation student scientific conference "Physics of Space". Ural University Press, 2024. http://dx.doi.org/10.15826/b978-5-7996-3848-1.30.

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Анотація:

The paper presents the results of processing observations of the formation region of massive stars S255IR. We identified the molecular lines SO, 33SO, SO2, SiO, OO, 13OO, O13O, OH3OH, OH3ON, OH3OOH 3, OH3OHO, H2OS, HOOOH, HO13N, HO3N, OOS, NS, 00H, HOOO, HNOO. These molecules are indicators of hot nuclei and outflows, from which we infer high temperatures and densities in this region.

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