Characteristic scale of star formation – I. Clump formation efficiency on local scales

Eden, David; Moore, T. J. T.; Plume, R.; Rigby, Andrew; Urquhart, J. S.; Clark, Paul; Smith, M.; Tahani, K.; Ragan, S. E.; Thompson, Michelle; Johnstone, Doug; Parsons, Harriet; Rani, R.

doi:10.1093/mnras/staa3188

Cited by 8 publications

(4 citation statements)

References 100 publications

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“…There are also a number of papers that have estimated core or clump formation efficiency in different environments, and comparing our results with them can gain more useful information about the physical properties of the parent molecular clouds. Recent studies have suggested that the average CFE on Galactic scales is about 8% (Eden et al 2012;Battisti & Heyer 2014;Eden et al 2021), consistent with the low efficiency found in simulation (Padoan & Nordlund 2002). According to the calculation of Nguyen Luong et al ( 2011), the clumps formation efficiency of the whole W43 molecular complex is about 11%.…”

Section: Properties and Formation Of Cores In Afgl 333-ridgesupporting

confidence: 67%

Investigating the physical properties and fragmentation of the AFGL 333-Ridge

Liang,

Xu,

Wang

2021

Preprint

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We present multi-wavelength data to investigate the physical properties and fragmentation of AFGL 333-Ridge. A statistical analysis of velocity dispersion indicates that turbulence is the dominant motion in the ridge. However, the linear mass density (1124.0 M ⊙ /pc) of AFGL 333-Ridge far exceeds its critical value of 406.5 M ⊙ /pc, suggesting that additional motions are required to prevent the filament radial collapse. Using the getsources algorithm, we identified 14 cores from the Herschel maps, including two protostellar cores and 12 starless cores. All of these starless cores are gravitationally bound, and are therefore considered to be prestellar cores. Based on their radius-mass relation, 11 of 14 cores have the potential to form massive stars. Moreover, the seven cores in two sub-filaments of AFGL 333-Ridge seem to constitute two necklace-like chains with a spacing length of 0.51 pc and 0.45 pc, respectively. Compared the spacing length with theoretical prediction lengths by Jeans and cylindrical fragmentations, we argued that the combination of turbulence and thermal pressure may lead to the fragmentation of the two sub-filaments into the cores.

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Section: Properties and Formation Of Cores In Afgl 333-ridgesupporting

confidence: 67%

Investigating the physical properties and fragmentation of the AFGL 333-Ridge

Liang,

Xu,

Wang

2021

Preprint

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“…Kalberla & Haud (2019) investigated the turbulent properties of HI separated into the CNM, LNM, and WNM to reveal that each phase has distinct turbulent properties. Eden et al (2021) analysed the two-dimensional spatial power spectrum (SPS) of maps of the dense gas mass fraction derived independently from a combination of H 2 column density estimated from dust continuum and the ratio of CO intensities to show ∼10 pc is the characteristic scale for the largest variations in the clump and star formation efficiencies in CO-traced clouds formed by supersonic turbulence. Pingel et al (2018) explicitly compared the turbulent properties of several multi-wavelength tracers in the Perseus molecular cloud including dust, HI, and CO. Each tracer showed characteristics of a distinct turbulent environment, such as self-gravitating, supersonic medium in the dust and mostly transonic medium in the HI.…”

Section: Introductionmentioning

confidence: 99%

GASKAP-HI pilot survey science I: ASKAP zoom observations of Hi emission in the Small Magellanic Cloud

Pingel

Dempsey

McClure‐Griffiths

et al. 2022

Publ. Astron. Soc. Aust.

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We present the most sensitive and detailed view of the neutral hydrogen ( ${\rm H\small I}$ ) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilot survey. These GASKAP-HI pilot observations, for the first time, reveal ${\rm H\small I}$ in the SMC on similar physical scales as other important tracers of the interstellar medium, such as molecular gas and dust. The resultant image cube possesses an rms noise level of 1.1 K ( $1.6\,\mathrm{mJy\ beam}^{-1}$ ) $\mathrm{per}\ 0.98\,\mathrm{km\ s}^{-1}$ spectral channel with an angular resolution of $30^{\prime\prime}$ ( ${\sim}10\,\mathrm{pc}$ ). We discuss the calibration scheme and the custom imaging pipeline that utilises a joint deconvolution approach, efficiently distributed across a computing cluster, to accurately recover the emission extending across the entire ${\sim}25\,\mathrm{deg}^2$ field-of-view. We provide an overview of the data products and characterise several aspects including the noise properties as a function of angular resolution and the represented spatial scales by deriving the global transfer function over the full spectral range. A preliminary spatial power spectrum analysis on individual spectral channels reveals that the power law nature of the density distribution extends down to scales of 10 pc. We highlight the scientific potential of these data by comparing the properties of an outflowing high-velocity cloud with previous ASKAP+Parkes ${\rm H\small I}$ test observations.

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“…Kalberla & Haud (2019) investigated the turbulent properties of H i separated into the CNM, LNM, and WNM to reveal that each phase has distinct turbulent properties. Eden et al (2021) analyzed the two-dimensional spatial power-spectrum of maps of the dense gas mass fraction derived independently from a combination of H 2 column density estimated from dust continuum and the ratio of CO intensities to show ∼10 pc is the characteristic scale for the largest variations in the clump and star formation efficiencies in CO-traced clouds formed by supersonic turbulence. Pingel et al (2018) explicitly compared the turbulent properties of several multi-wavelength tracers in the Perseus molecular cloud including dust, H i, and CO. Each tracer showed characteristics of a distinct turbulent environment, such as self-gravitating, supersonic medium in the dust and mostly transonic medium in the H i.…”

Section: Introductionmentioning

confidence: 99%

GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud

Pingel,

Dempsey,

McClure-Griffiths

et al. 2021

Preprint

View full text Add to dashboard Cite

We present the most sensitive and detailed view of the neutral hydrogen (H i) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilot survey. These GASKAP-HI pilot observations, for the first time, reveal H i in the SMC on similar physical scales as other important tracers of the interstellar medium, such as molecular gas and dust. The resultant image cube possesses an rms noise level of 1.1 K (1.6 mJy/beam) per 0.98 km s −1 spectral channel with an angular resolution of 30 (∼10 pc). We discuss the calibration scheme and the custom imaging pipeline that utilizes a joint deconvolution approach, efficiently distributed across a computing cluster, to accurately recover the emission extending across the entire ∼25 deg 2 field-of-view. We provide an overview of the data products and characterize several aspects including the noise properties as a function of angular resolution and the represented spatial scales by deriving the global transfer function over the full spectral range. A preliminary spatial power spectrum analysis on individual spectral channels reveals that the power-law nature of the density distribution extends down to scales of 10 pc. We highlight the scientific potential of these data by comparing the properties of an outflowing high velocity cloud with previous ASKAP+Parkes H i test observations.

show abstract

Characteristic scale of star formation – I. Clump formation efficiency on local scales

Cited by 8 publications

References 100 publications

Investigating the physical properties and fragmentation of the AFGL 333-Ridge

Investigating the physical properties and fragmentation of the AFGL 333-Ridge

GASKAP-HI pilot survey science I: ASKAP zoom observations of Hi emission in the Small Magellanic Cloud

GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud

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