Infall signatures in a prestellar core embedded in the high-mass 70 mu m Dark IRDC G331.372-00.116
Author
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Contreras, Yanett
Author
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Sanhueza, Patricio
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Jackson, James M.
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Guzmán, Andrés E.
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Longmore, Steven
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Garay Brignardello, Guido
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Zhang, Qizhou
Author
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Quang, Nguyen-Lu'o'Ng
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Tatematsu, Ken'ichi
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Nakamura, Fumitaka
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Sakai, Takeshi
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Ohashi, Satoshi
Author
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Liu, Tie
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Saito, Masao
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Gómez, Laura
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Rathborne, Jill
Author
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Whitaker, Scott
Admission date
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2018-11-08T20:23:45Z
Available date
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2018-11-08T20:23:45Z
Publication date
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2018-07
Cita de ítem
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Astrophysical Journal Volumen: 861 Número: 1 Número de artículo: 14
es_ES
Identifier
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10.3847/1538-4357/aac2ec
Identifier
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https://repositorio.uchile.cl/handle/2250/152518
Abstract
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Using Galactic Plane surveys, we have selected a massive (1200M circle dot), cold (14 K) 3.6-70 mu m dark IRDC, G331.372-00.116. This infrared dark cloud (IRDC) has the potential to form high-mass stars, and given the absence of current star formation signatures, it seems to represent the earliest stages of high-mass star formation. We have mapped the whole IRDC with the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.1 and 1.3 mm in dust continuum and line emission. The dust continuum reveals 22 cores distributed across the IRDC. In this work, we analyze the physical properties of the most massive core, ALMA1, which has no molecular outflows detected in the CO (2-1), SiO (5-4), and H2CO (3-2) lines. This core is relatively massive (M = 17.6M circle dot), subvirialized (virial parameter alpha(vir) = M-vir/M = 0.14), and is barely affected by turbulence (transonic Mach number of 1.2). Using the HCO+ (3-2) line, we find the first detection of infall signatures in a relatively massive, prestellar core (ALMA1) with the potential to form a high-mass star. We estimate an infall speed of 1.54 km s(-1) and a high accretion rate of 1.96. x. 10(-3) M circle dot yr(-1). ALMA1 is rapidly collapsing, out of virial equilibrium, which is more consistent with competitive accretion scenarios rather than the turbulent core accretion model. On the other hand, ALMA1 has a mass similar to 6 times larger than the clumps Jeans mass, as it is in an intermediate mass regime (M-J = 2.7 < M less than or similar to 30 M circle dot), contrary to what both the competitive accretion and turbulent core accretion theories predict.
es_ES
Patrocinador
dc.description.sponsorship
National Astronomical Observatory of Japan
FONDECYT
3150570
Japan Society for the Promotion of Science (JSPS)
18H01259
Conicyt project
PFB-06