Iras 16547–4247: A New Candidate of a Protocluster Unveiled With Alma

Higuchi, Aya E.; Saigo, Kazuya; Chibueze, James O.; Sanhueza, Patricio; Takakuwa, Shigehisa; Garay, Guido

doi:10.1088/2041-8205/798/2/l33

Cited by 14 publications

(19 citation statements)

References 28 publications

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“…It has a very dense single central region surrounded by a cloud of about 1300 ⊙ . A couple of wind jets have been detected recently in this star forming region and they are belived to be generated by a massive protostar; see [24]. The model studied here can be modified in order to take into account the new findings.…”

Section: Discussionmentioning

confidence: 97%

Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud

Arreaga‐García

Saucedo-Morales

2015

Advances in Astronomy

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By using the particle-based code Gadget2, we follow the evolution of a gas giant molecular cloud, in which a set of gas particles representing the wind are created by a Monte Carlo scheme and suddenly move outwards from the cloud’s center. The particles representing the gas cloud initially have a velocity according to a turbulent spectrum built in a Fourier space of 643grid elements. The level of turbulence and the temperature of the cloud are both adjusted so that a gravitational collapse of the cloud is initially induced. All the winds are activated in a very early stage of evolution of the cloud. We consider only two kinds of winds, namely, one with spherical symmetry and the second one of a bipolar collimated jet. In order to assess the dynamical change in the cloud due to interactions with the winds, we show isovelocity and isodensity plots for all our simulations. We also report on the accretion centers detected at the last simulation time available for each model.

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Section: Discussionmentioning

confidence: 97%

Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud

Arreaga‐García

Saucedo-Morales

2015

Advances in Astronomy

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“…The high-mass star-forming region IRAS16547-4247 was recently observed with ALMA (Higuchi et al 2015). The region is located at a distance of 2.9 kpc and was observed at an angular resolution of ∼0″.…”

Section: Comparison To Alma Observations Of Iras16547-4247mentioning

confidence: 93%

“…Methanol is only expected to thermally evaporate at T > 100 K (Brown & Bolina 2007), and such a region would have a radius of <1″ (Bisschop et al 2007). Thus, it appears likely that the spatially extended emission is caused by other, perhaps low-mass, outflow sources as also argued by Higuchi et al (2015). Below, the standard model results are compared to these observations without fine-tuning the input parameters.…”

Section: −1mentioning

confidence: 96%

“…large-scale CO outflow, and part of the methanol emission is clearly associated with the high-mass outflow (Higuchi et al 2015). The more widespread diffuse methanol emission is likely connected to outflow activity based on the large line-width (10 km s…”

Section: Comparison To Alma Observations Of Iras16547-4247mentioning

confidence: 99%

“…The central source drives a Higuchi et al (2015). Bottom: radially averaged flux from the center of the cluster (blue), multiplied by 2.…”

Section: Comparison To Alma Observations Of Iras16547-4247mentioning

confidence: 99%

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Tracing Embedded Stellar Populations in Clusters and Galaxies Using Molecular Emission: Methanol as a Signature of the Low-Mass End of the Imf

Kristensen

Bergin

2015

ApJ

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Most low-mass protostars form in clusters, in particular high-mass clusters; however, how low-mass stars form in high-mass clusters and what the mass distribution is are still open questions both in our own Galaxy and elsewhere.To access the population of forming embedded low-mass protostars observationally, we propose using molecular outflows as tracers. Because the outflow emission scales with mass, the effective contrast between low-mass protostars and their high-mass cousins is greatly lowered. In particular, maps of methanol emission at 338.4 GHz (J = 7 0 -6 0 A + ) in low-mass clusters illustrate that this transition is an excellent probe of the low-mass population. We present here a model of a forming cluster where methanol emission is assigned to every embedded low-mass protostar. The resulting model image of methanol emission is compared to recent ALMA observations toward a high-mass cluster and the similarity is striking: the toy model reproduces observations to better than a factor of two and suggests that approximately 50% of the total flux originates in low-mass outflows. Future fine-tuning of the model will eventually make it a tool for interpreting the embedded low-mass population of distant regions within our own Galaxy and ultimately higher-redshift starburst galaxies, not just for methanol emission but also water and high-J CO.

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Sgr B2(N): A BIPOLAR OUTFLOW AND ROTATING HOT CORE REVEALED BY ALMA

Higuchi

Hasegawa

Saigo

et al. 2015

ApJ

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We present the results of SiO (2 − 1) and SO 2 (12 4,8 − 13 3,11 ) line observations of Sgr B2(N) made with the Atacama Large Millimeter/submillimeter Array (ALMA) at an angular resolution of ∼2 ′′ . Our analysis of the SiO and SO 2 line emission reveals a bipolar molecular outflow in an east-west direction whose driving source is located at K2. In addition, SO 2 line core shows a north-south velocity gradient most probably indicating a hot core of molecular gas rotating around K2. Fractional abundances of SO 2 and SiO (X(SO 2 ) and X(SiO), respectively) in the outflowing molecular gas are derived from comparisons with the C 18 O emission. Assuming an excitation temperature of 100 ± 50 K, we calculate X(SO 2 ) = 2.3 +2.6 −0.4 ×10 −8 and X(SiO) = 1.2 +0.1 −0.1 ×10 −9 . The outflow from Sgr B2(N) K2 is characterized as a young (5×10 3 yr) and massive (∼2000 M ⊙ ), but moderately collimated (∼60 • ) outflow. We also report a possible detection of the SiO (v = 2, J = 2 − 1) maser emission from the position of K2. If confirmed, it would make Sgr B2(N) the 4 th star forming region associated with SiO masers.

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Iras 16547–4247: A New Candidate of a Protocluster Unveiled With Alma

Cited by 14 publications

References 28 publications

Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud

Hydrodynamic Modeling of the Interaction of Winds within a Collapsing Turbulent Gas Cloud

Tracing Embedded Stellar Populations in Clusters and Galaxies Using Molecular Emission: Methanol as a Signature of the Low-Mass End of the Imf

Sgr B2(N): A BIPOLAR OUTFLOW AND ROTATING HOT CORE REVEALED BY ALMA

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