A water vapour maser in the Large Magellanic Cloud

Scalise, E.; Braz, M. A.

doi:10.1038/290036a0

Cited by 29 publications

(20 citation statements)

References 11 publications

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“…The first extragalactic Young Stellar Object (YSO) labelled P1 was discovered by Gatley et al (1981) in N159. The region also contains the first extragalactic type I OH maser (Caswell & Haynes 1981) and a H 2 O maser (Scalise & Braz 1981). Later a second YSO, labelled P2, was discovered by Jones et al (1986) in N159A.…”

Section: Introductionmentioning

confidence: 97%

VLT/NACO near-infrared imaging and spectroscopy of N159-5 in the LMC HII complex N159

Testor¹,

Lemaire²,

Kristensen³

et al. 2007

A&A

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We present high-resolution near-infrared imaging of the compact HII region N159-5 and its immediate environment in the giantstar forming region N159 in the LMC. N159-5 was observed at high spatial resolution ∼0. 11−0. 25 in the K-band using the ESO Very Large Telescope UT4 (VLT), equipped with the NAOS adaptive optics system. Our data reveal that N159-5 has a complex morphology formed mainly by two wings and probably a single central bright star, embedded in diffuse emission of ∼4. 5 diameter. A remarkable embedded tight cluster of approximatively the same size, containing at least 38 faint stars coinciding with N159-5, is also detected. Such clusters can be found in galactic HII regions like the star-forming regions SH2 269 or M42. At the location of the radio peak, especially in the bright western wing, this cluster is rich in stars. Spectroscopic observations reveal that the diffuse region is constituted mainly of dust continuum and that the bright star #2-55 could be of type O8 V. A comparison with the radio observation flux of N159-5 published in the literature seems to show that the bright star #2-55 is not the only ionization source of N159-5. Towards N159-5 molecular H 2 emission is detected. A model of the region is proposed.

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Section: Introductionmentioning

confidence: 97%

VLT/NACO near-infrared imaging and spectroscopy of N159-5 in the LMC HII complex N159

Testor¹,

Lemaire²,

Kristensen³

et al. 2007

A&A

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show abstract

“…In N159 the first extragalactic YSO labelled P1 was discovered by Gatley et al (1981). The region also contains the first extragalactic type I OH maser (Caswell & Haynes 1981) and a H 2 O maser (Scalise & Braz 1981). Using a 5 spatial resolution a second YSO labelled P2 was discovered by Jones et al (1986) in N159A.…”

Section: Introductionmentioning

confidence: 98%

VLT/NACO near-infrared imaging and spectroscopy of N159A in the LMC HII complex N159

Testor¹,

Lemaire

Field³

et al. 2006

A&A

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We present near-infrared imaging and spectrocopic observations of the HII region N159A (∼10 pc) in the giant star-forming region N159 (50 pc) in the LMC. N159A was observed in the J and Ks bands at high spatial resolution ∼0.2 using the ESO Very Large Telescope UT4 (VLT), equipped with the NAOS adaptative optics system. Our data reveal the morphology of this region in unprecedented detail. The protostar P2, one of the first YSOs of Class I identified in the LMC is now resolved in two YSO candidates. The ultracompact HII region LI-LMC 1501W is found to be a tight cluster embedded in a compact HII region ionised by a late O source. A new multiple system composed of a tight star cluster and an YSO candidate, all embedded in a compact nebular region (0.4 pc) is also detected at the north-east edge of N159A. The stellar population of the whole N159A region appears composed of two main stellar populations, one with an age ≤3 Myr and the other one with a large range of age (300 Myr-10 Gyr). Using spectroscopy, one of the two exciting O stars in the HII region N159A is classified O5-O6.

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“…N159 is a group of H ii regions cataloged by Henize (1956), who gave separate letters to distinguish between the clumps of nebulosity found within the complex. The first extragalactic protostar was discovered in the N159 complex (Gatley et al 1981), as well as the first extragalactic type I OH maser (Caswell & Haynes 1981), and the region contains an H 2 O maser (Scalise & Braz 1981).…”

Section: Introductionmentioning

confidence: 99%

SpitzerIRAC Observations of Star Formation in N159 in the Large Magellanic Cloud

Jones

Woodward

Boyer

et al. 2005

ApJ

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We present observations of the giant H ii region complex N159 in the LMC using IRAC on the Spitzer Space Telescope. One of the two objects previously identified as protostars in N159 has a spectral energy distribution (SED) consistent with classification as a Class I young stellar object (YSO), and the other is probably a Class I YSO as well, making these two stars the youngest stars known outside the Milky Way. We identify two other sources that may also be Class I YSOs. One component, N159AN, is completely hidden at optical wavelengths but is very prominent in the infrared. The integrated luminosity of the entire complex is L % 9 ; 10 6 L , consistent with the observed radio emission, assuming a normal Galactic initial mass function (IMF ). There is no evidence for a red supergiant population indicative of an older burst of star formation. The N159 complex is 50 pc in diameter, larger in physical size than typical H ii regions in the Milky Way with comparable luminosity. We argue that all of the individual components are related in their star formation history. The morphology of the region is consistent with a wind-blown bubble %1-2 Myr old that has initiated star formation now taking place at the rim. Other than its large physical size, star formation in N159 appears to be indistinguishable from star formation in the Milky Way.

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A water vapour maser in the Large Magellanic Cloud

Cited by 29 publications

References 11 publications

VLT/NACO near-infrared imaging and spectroscopy of N159-5 in the LMC HII complex N159

VLT/NACO near-infrared imaging and spectroscopy of N159-5 in the LMC HII complex N159

VLT/NACO near-infrared imaging and spectroscopy of N159A in the LMC HII complex N159

SpitzerIRAC Observations of Star Formation in N159 in the Large Magellanic Cloud

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