Identifying young stellar objects in nine Large Magellanic Cloud star-forming regions

Carlson, L. R.; Sewiło, M.; Meixner, Margaret; Romita, Krista; Lawton, Brandon

doi:10.1051/0004-6361/201118627

Cited by 64 publications

(119 citation statements)

References 73 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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“…(8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) a Evolutionary stages for YSO candidates are labeled as 'ya', 'yb', and 'yc', indicating their stages from I to III, which refer to Chen et al (2010) and Carlson et al (2012). The label 'ysc', 'HEB', and 'YSO' indicate young stellar cluster (Chen et al 2010), HEB objects and massive YSO from Martín-Hernández et al (2008), respectively.…”

Section: Discussionmentioning

confidence: 99%

“…-29 - candidates from the literature are marked with blue plus symbols (Chen et al 2010), and brown plus symbols (Carlson et al 2012). The evolutionary stages of the YSO candidates are labeled 'ya', 'yb', and 'yc', indicating their stages from I to III, respectively, as in Chen et al (2010) and Carlson et al (2012).…”

Section: Discussionmentioning

confidence: 99%

“…The evolutionary stages of the YSO candidates are labeled 'ya', 'yb', and 'yc', indicating their stages from I to III, respectively, as in Chen et al (2010) and Carlson et al (2012). The label 'ysc' indicates a young stellar cluster (Chen et al 2010), and the open orange diamonds are HEBs (A1 and A2) and a massive YSO (A-IR) -34 - Fig.…”

Section: Discussionmentioning

confidence: 99%

“…(2010) and Carlson et al (2012). In addition, we used the catalog of the AKARI Infrared Camera (IRC) survey in the LMC (Ita et al 2008;Kato et al 2012) and classified new YSO candidates in this complex, using the color-color diagram ( Figure 2).…”

Section: Highly Polarized Sourcesmentioning

confidence: 99%

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Near-infrared Polarimetric Study of the N159/N160 Star-forming Complex in the Large Magellanic Cloud

Kim

Jeong

Pyo

et al. 2017

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We present near-infrared polarimetric results for the N159/N160 star-forming complex in the Large Magellanic Cloud (LMC) with SIRPOL, the polarimeter of the Infrared Survey Facility. We separated foreground sources using their visual extinction derived from near-infrared photometric data. The 45 young stellar candidates and 2 high-excitation blobs were matched with our sources, and 12 of them showed the high polarization that did not originate from the interstellar dust. We made a polarimetric catalog of 252, 277, and 89 sources at the J, H, and K s bands, respectively. Based on the ratios of the polarization degree between these bands, we verify that the origin of these polarized sources is the dichroic extinction from the interstellar dust aligned by the magnetic field and that the ratios follow a power-law dependence of P λ ∼ λ −0.9 . The linear polarization vectors projected onto the Hα image of the complex turned out to follow the local magnetic field structure. The vector map overlaid on dust and gas emissions shows the close correlation between the magnetic field structure and surrounding interstellar medium. We suggest that the derived magnetic field structure supports the sequential formation scenario of the complex.

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Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds

Sewiło

Charnley

Schilke

et al. 2019

ACS Earth Space Chem.

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The Large and Small Magellanic Clouds (LMC and SMC), gas-rich dwarf companions of the Milky Way, are the nearest laboratories for detailed studies on the formation and survival of complex organic molecules (COMs) under metal poor conditions. To date, only methanol, methyl formate, and dimethyl ether have been detected in these galaxies -all three toward two hot cores in the N113 star-forming region in the LMC, the only extragalactic sources exhibiting complex hot core chemistry. We describe a small and diverse sample of the LMC and SMC sources associated with COMs or hot core chemistry, and compare the observations to theoretical model predictions. Theoretical models accounting for the physical conditions and metallicity of hot molecular cores in the Magellanic Clouds have been able to broadly account for the existing observations, but fail to reproduce the dimethyl ether abundance by more than an order of magnitude. We discuss future prospects for research in the field of complex chemistry in the low-metallicity environment. The detection of COMs in the Magellanic Clouds has important implications for astrobiology. The metallicity of the Magellanic Clouds is similar to galaxies in the earlier epochs of the Universe, thus the presence of COMs in the LMC and SMC indicates that a similar prebiotic chemistry leading to the emergence of life, as it happened on Earth, is possible in lowmetallicity systems in the earlier Universe.

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Identifying young stellar objects in nine Large Magellanic Cloud star-forming regions

Cited by 64 publications

References 73 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

Near-infrared Polarimetric Study of the N159/N160 Star-forming Complex in the Large Magellanic Cloud

Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds

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