The youngest massive protostars in the Large Magellanic Cloud

Sewiło, M.; Indebetouw, R.; Carlson, L. R.; Whitney, B. A.; Chen, C.-H. Rosie; Meixner, Margaret; Robitaille, Thomas; Loon, Jacco Th. van; Oliveira, J. M.; Churchwell, E.; Simon, Joshua D.; Hony, S.; Panuzzo, P.; Sauvage, M.; Roman-Duval, Julia; Gordon, K. D.; Engelbracht, C. W.; Misselt, K. A.; Okumura, K.; Beck, Tracy; Hora, J. L.; Woods, Paul

doi:10.1051/0004-6361/201014688

Cited by 34 publications

(34 citation statements)

References 35 publications

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“…The gas and dust in this central region are compressed by a complex structure of ionized gas bubbles (prominent in the Hα images) created by massive stars in several young clusters (Oliveira et al 2006). Based on the Spitzer Space Telescope and the Herschel Space Observatory data, confirmed and candidate Stage 0-II YSOs down to M 3  were identified (e.g., Sewiło et al 2010;Carlson et al 2012).…”

Section: The N 113 Star-forming Regionmentioning

confidence: 99%

The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud

Sewiło

Indebetouw

Charnley

et al. 2018

ApJL

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We report the first extragalactic detection of the complex organic molecules (COMs) dimethyl ether (CH 3 OCH 3 ) and methyl formate (CH 3 OCHO) with the Atacama Large Millimeter/submillimeter Array (ALMA). These COMs, together with their parent species methanol (CH 3 OH), were detected toward two 1.3 mm continuum sources in the N 113 star-forming region in the low-metallicity Large Magellanic Cloud (LMC). Rotational temperatures (T 130 rot~K ) and total column densities (N 10 rot 16 cm −2 ) have been calculated for each source based on multiple transitions of CH 3 OH. We present the ALMA molecular emission maps for COMs and measured abundances for all detected species. The physical and chemical properties of two sources with COMs detection, and the association with H 2 O and OH maser emission, indicate that they are hot cores. The fractional abundances of COMs scaled by a factor of 2.5 to account for the lower metallicity in the LMC are comparable to those found at the lower end of the range in Galactic hot cores. Our results have important implications for studies of organic chemistry at higher redshift.

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Section: The N 113 Star-forming Regionmentioning

confidence: 99%

The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud

Sewiło

Indebetouw

Charnley

et al. 2018

ApJL

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“…We do not use the PACS data for analysis in this paper, but anticipate that with cross-scans the PACS data will be viable for an extended map of the diffuse ISM. Nevertheless, the destriping was effective for small regions (Otsuka et al 2010) and revealing point sources (Sewiło et al 2010;Boyer et al 2010).…”

Section: Pacs Data Reductionmentioning

confidence: 99%

“…During the science demonstration phase (SDP), we imaged a long strip across the LMC that covers the entire range of interesting objects we expect to study with HERITAGE: giant molecular and diffuse H I clouds (Roman-Duval et al 2010;Kim et al 2010), H II regions , young stellar objects (Sewiło et al 2010), supernova remnants (Otsuka et al 2010), and evolved stars (Boyer et al 2010). In this paper, we present the observing strategy, processing and resulting data set (Sect.…”

Section: Introductionmentioning

confidence: 99%

HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

Meixner

Galliano

Hony

et al. 2010

A&A

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111

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The HERschel Inventory of The Agents of Galaxy Evolution (HERITAGE) of the Magellanic Clouds will use dust emission to investigate the life cycle of matter in both the Large and Small Magellanic Clouds (LMC and SMC). Using the Herschel Space Observatory's PACS and SPIRE photometry cameras, we imaged a 2 • × 8 • strip through the LMC, at a position angle of ∼22.5 • as part of the science demonstration phase of the Herschel mission. We present the data in all 5 Herschel bands: PACS 100 and 160 μm and SPIRE 250, 350 and 500 μm. We present two dust models that both adequately fit the spectral energy distribution for the entire strip and both reveal that the SPIRE 500 μm emission is in excess of the models by ∼6 to 17%. The SPIRE emission follows the distribution of the dust mass, which is derived from the model. The PAH-to-dust mass ( f PAH ) image of the strip reveals a possible enhancement in the LMC bar in agreement with previous work. We compare the gas mass distribution derived from the HI 21 cm and CO J = 1−0 line emission maps to the dust mass map from the models and derive gas-to-dust mass ratios (GDRs). The dust model, which uses the standard graphite and silicate optical properties for Galactic dust, has a very low GDR = 65 +15 −18making it an unrealistic dust model for the LMC. Our second dust model, which uses amorphous carbon instead of graphite, has a flatter emissivity index in the submillimeter and results in a GDR = 287 +25 −42 that is more consistent with a GDR inferred from extinction.

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“…The vast majority of point-sources detected in the LMC SDP data appear to be young stellar objects (YSOs) or background galaxies (Sewiło et al 2010); AGB stars were not detected. Here, we describe the Herschel observations of three very dusty massive stars (Fig.…”

Section: The Ir Nature Of Detected Sourcesmentioning

confidence: 99%

Cold dust in three massive evolved stars in the LMC

Boyer¹,

Sargent²,

Loon

et al. 2010

A&A

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Massive evolved stars can produce large amounts of dust, and far-infrared (IR) data are essential for determining the contribution of cold dust to the total dust mass. Using Herschel, we search for cold dust in three very dusty massive evolved stars in the Large Magellanic Cloud: R71 is a luminous blue variable, HD 36402 is a Wolf-Rayet triple system, and IRAS05280-6910 is a red supergiant. We model the spectral energy distributions using radiative transfer codes and find that these three stars have mass-loss rates up to 10 −3 M yr −1 , suggesting that high-mass stars are important contributors to the life-cycle of dust. We found far-IR excesses in two objects, but these excesses appear to be associated with ISM and star-forming regions. Cold dust (T < 100 K) may thus not be an important contributor to the dust masses of evolved stars.

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The youngest massive protostars in the Large Magellanic Cloud

Cited by 34 publications

References 35 publications

The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud

The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud

HERschelInventory of The Agents of Galaxy Evolution (HERITAGE): The Large Magellanic Cloud dust

Cold dust in three massive evolved stars in the LMC

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