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We have observed the Class I protostellar source Elias 29 with Atacama Large Millimeter/submillimeter Array (ALMA). We have detected CS, SO, $^{34}$SO, SO$_2$, and SiO line emissions in a compact component concentrated near the protostar…

We present optical spectroscopic data of the inner circumstellar ring around SN 1987A from the Anglo-Australian Telescope (AAT) and the Very Large Telescope (VLT) between ~1400 and ~5000 days post-explosion. We also assembled the available…

Solar and Stellar Astrophysics · Physics 2015-05-18 Seppo Mattila , Peter Lundqvist , Per Groeningsson , Peter Meikle , Raylee Stathakis , Claes Fransson , Russell Cannon

In a multi-wavelength study of thermal emission and scattered light images we analyse the dust properties and structure of the debris disc around the A1-type main sequence star 49~Cet. As a basis for this study, we present new scattered…

Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies morphological and stellar properties correlate with their CGM properties. We report an analysis of 66 well-imaged galaxies detected…

The study of the gas in the envelopes surrounding asymptotic giant branch (AGB) stars through observations in the millimetre wavelength range provides information about the history and nature of these molecular factories. Here we present…

Solar and Stellar Astrophysics · Physics 2019-09-18 L. Velilla-Prieto , J. Cernicharo , M. Agúndez , J. P. Fonfría , G. Quintana-Lacaci , N. Marcelino , A. Castro-Carrizo

The initial conditions of molecular clumps in which high-mass stars form are poorly understood. In particular, a more detailed study of the earliest evolutionary phases is needed. The APEX Telescope Large Area Survey of the whole inner…

Astrophysics of Galaxies · Physics 2018-02-14 M. Wienen , F. Wyrowski , K. M. Menten , J. S. Urquhart , C. M. Walmsley , T. Csengeri , B. S. Koribalski , F. Schuller

We present radio continuum observations of the spiral-shaped ionized feature (Sgr A West) within the inner pc of the Galactic center at three epochs spanning 1986 to 1995. The VLA A-configuration was used at $\lambda$2cm (resolution of…

Astrophysics · Physics 2016-08-30 F. Yusef-Zadeh , D. A. Roberts , J. Biretta

Observations by the Atacama Large Millimeter/sub-millimeter Array of the dust continuum and $^{13}$CO(3-2) millimeter emissions of the triple stellar system GG Tau A are analysed, giving evidence for a rotating gas disc and a concentric and…

Solar and Stellar Astrophysics · Physics 2018-04-04 N. T. Phuong , P. N. Diep , A. Dutrey , E. Chapillon , P. Darriulat , S. Guilloteau , D. T. Hoai , P. T. Nhung , Y. -W. Tang , N. T. Thao , P. Tuan-Anh

We present fully-sampled maps of 461 GHz CO (4-3), 807 GHz CO (7-6), and 492 GHz [CI] (3P1-3P0) emission from the inner 3 degrees of the Galactic Center region taken with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO)…

Molecular gas plays a critical role in regulating star formation and nuclear activity in galaxies. Sulphur bearing molecules, such as H2S, are sensitive to the physical and chemical environments in which they reside and are potential…

Understanding the processes that drive the morphology and kinematics of molecular gas in galaxies is crucial for comprehending star formation and, ultimately, galaxy evolution. Using data obtained with the James Webb Space Telescope (JWST)…

We present in this paper mid-infrared (5-8~$\mu$m) spectroscopy toward the massive young binary W3~IRS~5, using the EXES spectrometer in high-resolution mode ($R\sim$50,000) from the NASA Stratospheric Observatory for Infrared Astronomy…

We investigate the physical properties of the interstellar medium (ISM) in the merging pair of galaxies known as The Antennae (NGC 4038/39), using the deep coadded ~411 ks Chandra ACIS-S data set. The method of analysis and some of the main…

Astrophysics · Physics 2009-11-13 A. Baldi , J. C. Raymond , G. Fabbiano , A. Zezas , A. H. Rots , F. Schweizer , A. R. King , T. J. Ponman

Context. The Odin satellite is now into its sixteenth year of operation, much surpassing its design life of two years. One of the sources which Odin has observed in great detail is the Sgr A Complex in the centre of the Milky Way. Aims. To…

Astrophysics of Galaxies · Physics 2017-03-15 Aa. Sandqvist , Å. Hjalmarson , U. Frisk , S. Lundin , L. Nordh , M. Olberg , G. Olofsson

Using ALMA data, we have studied the HC$_3$N and continuum emission in the starburst ring (SB ring) and the circumnuclear disc (CND) of the SB/AGN composite galaxy NGC 1068. We have detected emission from vibrationally excited HC$_3$N…

NGC 5128 (Centaurus A) is one of the best targets to study AGN-feedback in the local Universe. Optical filaments located at 16 kpc from the galaxy along the radio jet direction show recent star formation, likely triggered by the interaction…

Astrophysics of Galaxies · Physics 2019-06-27 Quentin Salomé , Philippe Salomé , Antoine Gusdorf , Françoise Combes

Understanding gas flows between galaxies and their surrounding circum-galactic medium (CGM) is crucial to unveil the mechanisms regulating galaxy evolution, especially in the early Universe. However, observations of the CGM around massive…

We present an X-ray absorption line spectroscopic study of the large-scale hot interstellar medium (HISM) in the Galaxy. We detect Ne IX K$_\alpha$ absorption lines in the {\sl Chandra} grating spectra of seven Galactic low-mass X-ray…

Astrophysics · Physics 2009-11-10 Yangsen Yao , Q. Daniel Wang

(Abridged) We present the results from a detailed analysis of the 0.6 - 10 keV spectra of 23 ASCA observations of 18 objects. We find that in most cases the underlying continuum can be well-represented by a powerlaw with a photon index…

Astrophysics · Physics 2008-11-26 I. M. George , T. J. Turner , Hagai Netzer , K. Nandra , R. F. Mushotzky , T. Yaqoob

The circumstellar environment of the AGB star L$_{\rm 2}$ Puppis was observed with ALMA in cycle 3, with a resolution of $15 \times 18 \rm\ mas$. The molecular emission shows a differentially rotating disk, inclined to a nearly edge-on…

Solar and Stellar Astrophysics · Physics 2018-03-15 Ward Homan , Anita Richards , Leen Decin , Pierre Kervella , Alex de Koter , Iain McDonald , Keiichi Ohnaka