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We propose an observational test that can break the degeneracy of two main classes of microlensing models to the Magellanic Clouds: (a) the lenses are located in the Galactic halo, and (b) the lenses are located in the LMC disk. The source…

天体物理学 · 物理学 2009-10-31 HongSheng Zhao

We present quantitative studies of 8 late O and early B-type supergiants in the Magellanic Clouds using far-ultraviolet FUSE, ultraviolet IUE/HST and optical VLT-UVES spectroscopy. Temperatures, mass-loss rates and CNO abundances are…

天体物理学 · 物理学 2009-11-10 C. J. Evans , P. A. Crowther , A. W. Fullerton , D. J. Hillier

[13CII] observations in several Galactic sources show that the fine-structure [12CII] emission is often optically thick (the optical depths around 1 to a few). The aim of our study is to test whether this also affects the [12CII] emission…

星系天体物理 · 物理学 2019-11-20 Yoko Okada , Ronan Higgins , Volker Ossenkopf-Okada , Cristian Guevara , Jürgen Stutzki , Marc Mertens

We report a Far Ultraviolet Spectroscopic Explorer satellite observation of the supernova remnant N49 in the Large Magellanic Cloud, covering the 905 -- 1187 A spectral region. A 30'' square aperture was used, resulting in a velocity…

We present aperture synthesis imaging of dense molecular gas in the Large Magellanic Cloud, taken with the prototype millimeter receivers of the Australia Telescope Compact Array (ATCA). Our observations of the N113 HII region reveal a…

天体物理学 · 物理学 2019-08-14 Tony Wong , John B. Whiteoak , Juergen Ott , Yi-nan Chin , Maria R. Cunningham

We present infrared observations of the ultra-compact H II region W3(OH) made by the FORCAST instrument aboard SOFIA and by Spitzer/IRAC. We contribute new wavelength data to the spectral energy distribution, which constrains the optical…

We present a new analysis of the very first mid-infrared N-band long-baseline interferometric observations of an extragalactic source: the nucleus of the Seyfert 2 galaxy NGC 1068, obtained with MIDI (Mid-InfrareD Interferometer), the…

天体物理学 · 物理学 2009-11-11 A. Poncelet , G. Perrin , H. Sol

The effects of dust on infrared emission vary among galaxies of different morphological types. We investigated integrated spectral energy distributions in infrared and submillimeter emissions from the Large Magellanic Cloud based on the…

宇宙学与河外天体物理 · 物理学 2015-06-16 Sungeun Kim , Eunjoo Kwon , Kyoung-Sook Jeong , Kihun Kim , Chiyoung Cho , Eun Jung Chung

We report the first-ever discovery of a Wolf-Rayet (WR) star in the Large Magellanic Cloud via detection of a circular shell with the Spitzer Space Telescope. Follow-up observations with Gemini-South resolved the central star of the shell…

太阳与恒星天体物理 · 物理学 2015-06-19 V. V. Gvaramadze , A. -N. Chene , A. Y. Kniazev , O. Schnurr , T. Shenar , A. Sander , R. Hainich , N. Langer , W. -R. Hamann , Y. -H. Chu , R. A. Gruendl

We present a near-infrared band-merged photometric and polarimetric catalog for the 39$\arcmin$ $\times$ 69$\arcmin$ fields on the northeastern part of the Large Magellanic Cloud (LMC), which were observed using SIRPOL, an imaging…

星系天体物理 · 物理学 2016-01-20 Jaeyeong Kim , Woong-Seob Jeong , Soojong Pak , Won-Kee Park , Motohide Tamura

We investigate the nature of the innermost regions of seven circumstellar disks around pre-main-sequence stars. Our object sample contains disks apparently at various stages of their evolution. Both single stars and spatially resolved…

太阳与恒星天体物理 · 物理学 2015-05-13 A. A. Schegerer , S. Wolf , C. A. Hummel , S. P. Quanz , A. Richichi

We present time-series observations of Population \rom{2} Cepheids in the Large Magellanic Cloud at near-infrared ($JHK_s$) wavelengths. Our sample consists of 81 variables with accurate periods and optical ($VI$) magnitudes from the OGLE…

太阳与恒星天体物理 · 物理学 2017-03-22 Anupam Bhardwaj , Lucas M. Macri , Marina Rejkuba , Shashi M. Kanbur , Chow-Choong Ngeow , Harinder P. Singh

Aims: To explore the infrared and radio properties of one of the closest Galactic starburst regions. Methods: Images obtained with the Herschel Space Observatory at wavelengths of 70, 160, 250, 350, and 500 microns using the PACS and SPIRE…

The halo of NGC 891 has been the subject of studies for more than a decade. One of its most striking features is the large asymmetry in H-$\alpha$ emission. We have taken a quantitative look at this asymmetry at different wavelengths for…

天体物理学 · 物理学 2009-09-29 B. W. Holwerda , P. Kamphuis , R. J. Allen , R. F. Peletier , P. C. van der Kruit

As part of the VLT/X-shooter science verification, we obtained the first optical medium-resolution spectrum of a previously identified bright O-type object in NGC55, an LMC-like galaxy at a distance of \sim2.0 Mpc. Based on the stellar and…

太阳与恒星天体物理 · 物理学 2013-01-17 Olga Hartoog , Hugues Sana , Alex de Koter , Lex Kaper

We present the results of a FUSE survey of O VI 1031.93 Angstrom and 1037.62 Angstrom absorption toward 18 OB stars in the Small Magellanic Cloud (SMC). We detect O VI along every sight line. The average value of the O VI column density in…

We present high angular resolution near--infrared images of the obscured Galactic Giant HII (GHII) region G333.1--0.4 in which we detect an OB star cluster. For G333.1--0.4, we find OB stars and other massive objects in very early…

天体物理学 · 物理学 2009-11-10 E. Figueredo , R. D. Blum , A. Damineli , P. S. Conti

We present new groundbased 3 $\mu$m spectra of 14 young stellar objects with H_2O ice absorption bands. The broad absorption feature at 3.47 $\mu$m was detected toward all objects and its optical depth is correlated with the optical depth…

天体物理学 · 物理学 2009-10-31 T. Y. Brooke , K. Sellgren , T. R. Geballe

To study the atomic, molecular and ionized emission of Giant Molecular Clouds (GMCs), we have initiated a Large Program with the VLA: 'THOR - The HI, OH, Recombination Line survey of the Milky Way'. We map the 21cm HI line, 4 OH lines, 19…