Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde IV. The ALMA view of N113 and N159W in the LMC

Abstract

We mapped the kinetic temperature structure of two massive star-forming regions, N113 and N159W, in the Large Magellanic Cloud (LMC). We have used $\sim$1\hbox{$.{}^{\prime \prime }$}6\,($\sim$0.4\,pc) resolution measurements of the para-H${}_2$CO\,$J_{{\mathrm{K}}_{\mathrm{a}}{\mathrm{K}}_{\mathrm{c}}}$\,=\,3${}_{03}$--2${}_{02}$, 3${}_{22}$--2${}_{21}$, and 3${}_{21}$--2${}_{20}$ transitions near 218.5\,GHz to constrain RADEX non-LTE models of the physical conditions. The gas kinetic temperatures derived from the para-H${}_2$CO line ratios 3${}_{22}$--2${}_{21}$/3${}_{03}$--2${}_{02}$ and 3${}_{21}$--2${}_{20}$/3${}_{03}$--2${}_{02}$ range from 28 to 105\,K in N113 and 29 to 68\,K in N159W. Distributions of the dense gas traced by para-H${}_2$CO agree with those of the 1.3\,mm dust and \emph{Spitzer}\,8.0\,$\mu$m emission, but do not significantly correlate with the H$\alpha$ emission. The high kinetic temperatures ($T_{\mathrm{kin}}$\,$\gtrsim$\,50\,K) of the dense gas traced by para-H${}_2$CO appear to be correlated with the embedded infrared sources inside the clouds and/or YSOs in the N113 and N159W regions. The lower temperatures ($T_{\mathrm{kin}}$\,$<$\,50\,K) are measured at the outskirts of the H${}_2$CO-bearing distributions of both N113 and N159W. It seems that the kinetic temperatures of the dense gas traced by para-H${}_2$CO are weakly affected by the external sources of the H$\alpha$ emission. The non-thermal velocity dispersions of para-H${}_2$CO are well correlated with the gas kinetic temperatures in the N113 region, implying that the higher kinetic temperature traced by para-H${}_2$CO is related to turbulence on a $\sim$0.4\,pc scale. The dense gas heating appears to be dominated by internal star formation activity, radiation, and/or turbulence. It seems that the mechanism heating the dense gas of the star-forming regions in the LMC is consistent with that in Galactic massive star-forming regions located in the Galactic plane.

arXiv commentAccepted for publication in A&A

References in corpus (76)

• Star Formation in Galaxies Along the Hubble Sequence
• The Global Schmidt Law in Star Forming Galaxies
• A computer program for fast non-LTE analysis of interstellar line spectra
• The Star Formation Rate and Dense Molecular Gas in Galaxies
• Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• A distance to the Large Magellanic Cloud that is precise to one per cent
• Far Infrared and Submillimeter Emission from Galactic and Extragalactic Photo-Dissociation Regions
• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• HCN Survey of Normal Spiral, IR-luminous and Ultraluminous Galaxies
• Connecting Dense Gas Tracers of Star Formation in our Galaxy to High-z Star Formation
• The Magellanic Mopra Assessment (MAGMA). I. The Molecular Cloud Population of the Large Magellanic Cloud
• Stellar populations dominated by massive stars in dusty starburst galaxies across cosmic time
• Dense gas in the Galactic central molecular zone is warm and heated by turbulence
• Ammonia from cold high-mass clumps discovered in the inner Galactic disk by the ATLASGAL survey
• The RMS Survey: Ammonia and water maser analysis of massive star forming regions
• The thermal state of molecular clouds in the Galactic Center: evidence for non-photon-driven heating
• Chemical evolution in the early phases of massive star formation. I
• Extreme Cosmic-Ray-Dominated-Regions: a new paradigm for high star formation density events in the Universe
• Rotational quenching of H2CO by molecular hydrogen: cross-sections, rates, pressure broadening
• Dense Gas Tracers and Star Formation Laws in Active Galaxies: APEX Survey of HCN J=4-3, HCO+ J=4-3, and CS J=7-6
• Astrochemistry of Sub-Millimeter Sources in Orion: Studying the Variations of Molecular Tracers with Changing Physical Conditions
• ATLASGAL-selected massive clumps in the inner Galaxy: V. Temperature structure and evolution
• VLA observations of ammonia in high-mass star formation regions
• Abundances and Isotope Ratios in the Magellanic Clouds: The Star Forming Environment of N113
• The Temperature of Interstellar Clouds from Turbulent Heating
• Formaldehyde Densitometry of Starburst Galaxies
• Spitzer View of Young Massive Stars in the LMC HII Complexes. II. N159
• Thermal Feedback in the high-mass star and cluster forming region W51
• A systematic TMRT observational study of Galactic ${}^{12}$C/${}^{13}$C ratios from Formaldehyde
• Deuterated formaldehyde in rho Ophiuchi A
• The Stellar Mass Spectrum in Warm and Dusty Gas: Deviations from Salpeter in the Galactic Centre and in Circum-Nuclear Starburst Regions
• The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud
• Sub-millimeter Observations of Giant Molecular Clouds in the Large Magellanic Cloud: Temperature and Density as Determined from J=3-2 and J=1-0 transitions of CO
• First detection of ammonia in M82
• The Life and Death of Dense Molecular Clumps in the Large Magellanic Cloud
• Detection of a hot molecular core in the Large Magellanic Cloud with ALMA
• Masers associated with high-mass star formation regions in the Large Magellanic Cloud
• The dense gas mass fraction in the W51 cloud and its protoclusters
• Formaldehyde as a Tracer of Extragalactic Molecular Gas I. Para-H_2CO Emission From M 82
• ATLASGAL-selected massive clumps in the inner Galaxy: VI. Kinetic temperature and spatial density measured with formaldehyde
• Diversity of chemistry and excitation conditions in the high-mass star forming complex W33
• Spitzer IRAC Observations of Star Formation in N159 in the LMC
• Formaldehyde Densitometry of Starburst Galaxies: Density-Independent Global Star Formation
• ALMA view of the ${}^{12}$C/${}^{13}$C isotopic ratio in starburst galaxies
• The Molecular Gas Environment in the 20 km s${}^{-1}$ Cloud in the Central Molecular Zone
• Galactic H2CO Densitometry I: Pilot survey of Ultracompact HII regions and methodology
• Fire in the Heart: A Characterization of the High Kinetic Temperatures and Heating Sources in the Nucleus of NGC253
• Spectral Line Survey toward Molecular Clouds in the Large Magellanic Cloud
• The RMS Survey: Ammonia mapping of the environment of massive young stellar objects
• The youngest massive protostars in the Large Magellanic Cloud
• Kinetic temperature of massive star forming molecular clumps measured with formaldehyde
• Dense Clumps in Giant Molecular Clouds in the Large Magellanic Cloud: Density and Temperature Derived from ${}^{13}$CO($J=3-2$) Observations
• Deuteration around the ultracompact HII region Mon R2
• Molecular line emission in NGC 4945, imaged with ALMA
• ALMA Observations of Massive Clouds in the Central Molecular Zone: Ubiquitous Protostellar Outflows
• Strong irradiation of protostellar cores in Corona Australis
• Submillimeter Line Emission from LMC N159W: a Dense, Clumpy PDR in a Low Metallicity Environment
• Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde. III. The Orion Molecular Cloud 1
• Temperature structures in Galactic Center clouds - Direct evidence for gas heating via turbulence
• Kinetic temperature of massive star forming molecular clumps measured with formaldehyde. II. The Large Magellanic Cloud
• Spectroscopic study of the N159/N160 complex in the Large Magellanic Cloud
• First Detection of Ammonia in the Large Magellanic Cloud: The Kinetic Temperature of Dense Molecular Cores in N159W
• The relation of H2CO, 12CO, and 13CO in molecular clouds
• Synthesis Imaging of Dense Molecular Gas in the N113 HII Region of the Large Magellanic Cloud
• Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. II. 30 Doradus
• Probing the effects of external irradiation on low-mass protostars through unbiased line surveys
• Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds
• Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. I. N159W
• Different Evolutionary Stages in the Massive Star Forming Region W3 Main Complex
• ASTE observations in the 345 GHz window towards the HII region N113 of the Large Magellanic Cloud
• Dense gas in local galaxies revealed by multiple tracers
• Searching for shocks in high-mass starless clump candidates
• The comparison of H2CO(110-111), C18O(1-0) and continuum towards molecular clouds
• The physical and chemical structure of high-mass star-forming regions. Unraveling chemical complexity with the NOEMA large program "CORE"

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