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Dynamics of cluster...
Dynamics of cluster-forming hub-filament systems The case of the high-mass star-forming complex Monoceros R2
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- Treviño Morales, Sandra, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Fuente, A. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Sanchez-Monge, A. (författare)
- Universität zu Köln,University of Cologne
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- Kainulainen, Jouni, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Didelon, P. (författare)
- Paris Diderot University, France
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- Suri, S. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Universität zu Köln,University of Cologne
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- Schneider, N. (författare)
- Universität zu Köln,University of Cologne
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- Ballesteros-Paredes, J. (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Lee, Y. -N. (författare)
- Paris Diderot University, France
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- Hennebelle, P. (författare)
- Paris Diderot University, France
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- Pilleri, P. (författare)
- Université de Toulouse,University of Toulouse
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- Gonzalez-Garcia, M. (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Kramer, C. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Garcia-Burillo, S. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Luna, A. (författare)
- Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)
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- Goicoechea, J. R. (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Tremblin, P. (författare)
- Paris Diderot University, France
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- Geen, S. (författare)
- Ruprecht-Karls-Universität Heidelberg,Heidelberg University
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(creator_code:org_t)
- 2019-09-12
- 2019
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 629
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. High-mass stars and star clusters commonly form within hub-filament systems. Monoceros R2 (hereafter Mon R2), at a distance of 830 pc, harbors one of the closest of these systems, making it an excellent target for case studies. Aims. We investigate the morphology, stability and dynamical properties of the Mon R2 hub-filament system. Methods. We employed observations of the (CO)-C-13 and (CO)-O-18 1 -> 0 and 2 -> 1 lines obtained with the IRAM-30m telescope. We also used H-2 column density maps derived from Herschel dust emission observations. Results. We identified the filamentary network in Mon R-2 with the DisPerSE algorithm and characterized the individual filaments as either main (converging into the hub) or secondary (converging to a main filament). The main filaments have line masses of 30-100 M-circle dot pc(-1) and show signs of fragmentation, while the secondary filaments have line masses of 12-60 M-circle dot pc(-1) and show fragmentation only sporadically. In the context of Ostriker's hydrostatic filament model, the main filaments are thermally supercritical. If non-thermal motions are included, most of them are transcritical. Most of the secondary filaments are roughly transcritical regardless of whether non-thermal motions are included or not. From the morphology and kinematics of the main filaments, we estimate a mass accretion rate of 10(-4)-10(-3) M-circle dot yr(-1) into the central hub. The secondary filaments accrete into the main filaments at a rate of 0.1-0.4 x 10(-4) M-circle dot yr(-1). The main filaments extend into the central hub. Their velocity gradients increase toward the hub, suggesting acceleration of the gas. We estimate that with the observed infall velocity, the mass-doubling time of the hub is similar to 2.5 Myr, ten times longer than the free-fall time, suggesting a dynamically old region. These timescales are comparable with the chemical age of the HII region. Inside the hub, the main filaments show a ring-or a spiral-like morphology that exhibits rotation and infall motions. One possible explanation for the morphology is that gas is falling into the central cluster following a spiral-like pattern.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Biofysik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biophysics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
Nyckelord
- ISM: kinematics and dynamics
- ISM: clouds
- ISM: individual objects: Monoceros R2
- ISM: structure
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Treviño Morales, ...
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Fuente, A.
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Sanchez-Monge, A ...
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Kainulainen, Jou ...
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Didelon, P.
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Suri, S.
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visa fler...
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Schneider, N.
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Ballesteros-Pare ...
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Lee, Y. -N.
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Hennebelle, P.
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Pilleri, P.
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Gonzalez-Garcia, ...
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Kramer, C.
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Garcia-Burillo, ...
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Luna, A.
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Goicoechea, J. R ...
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Tremblin, P.
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Geen, S.
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