Search Publications
The Effect of the LMC on the Milky Way System
Vasiliev, Eugene
We review the recent theoretical and observational developments concerning the interaction of the Large Magellanic Cloud (LMC) with the Milky Way and its neighbourhood. An emerging picture is that the LMC is a fairly massive companion (10–20% of the Milky Way mass) and just passed the pericentre of its orbit, likely for the first time. The gravita…
Vertical Structure of the Milky Way Disk with Gaia DR3
Vieira, Katherine; Carraro, Giovanni; Korchagin, Vladimir +1 more
Using a complete sample of about 330,000 dwarf stars, well measured by Gaia DR3, limited to the galactic north and south solid angles |b|<75° and up to a vertical distance of 2 kpc, we analyze the vertical structure of the Milky Way stellar disks, based on projected tangential velocities. From selected subsamples dominated by their correspondin…
Young Radio Sources Expanding in Gas-Rich ISM: Using Cold Molecular Gas to Trace Their Impact
Morganti, Raffaella; Oosterloo, Tom; Murthy, Suma +2 more
We present an overview of the results obtained from the study of the resolved distribution of molecular gas around eight young (≲106yr), peaked-spectrum radio galaxies. Tracing the distribution and kinematics of the gas around these radio sources allows us to trace the interplay between the jets and the surrounding medium. For three of these sourc…
Metal Content in Relativistically Jetted and Radio-Quiet Quasars in the Main Sequence Context
Panda, Swayamtrupta; Marziani, Paola; Deconto Machado, Alice +1 more
The optical and UV properties of radio-quiet (RQ) and radio-loud (RL, relativistically "jetted") active galactic nuclei (AGN) are known to differ markedly; however, it is still unclear what is due to a sample selection and what is associated with intrinsic differences in the inner workings of their emitting regions. Chemical composition is an impo…
Astro-COLIBRI 2—An Advanced Platform for Real-Time Multi-Messenger Discoveries
Reichherzer, Patrick; Schüssler, Fabian; Lefranc, Valentin +3 more
The study of flaring astrophysical events in the multi-messenger approach requires instantaneous follow-up observations to better understand the nature of these events through complementary observational data. We present Astro-COLIBRI as a platform that integrates specific tools in the real-time multi-messenger ecosystem. The Astro-COLIBRI platfor…
The Influence of the Galactic Bar on the Dynamics of Globular Clusters
Carraro, Giovanni; Korchagin, Vladimir; Tkachenko, Roman +2 more
We make use of recent estimates for the parameters of the Milky Way's halo globular clusters and study the influence of the galactic bar on the dynamics of these clusters by computing their orbits. We use both an axisymmetric and non-axisymmetric galactic potentials, which include the rotating elongated bar/bulge structure. We account for observat…
Dense Molecular Environments of B[e] Supergiants and Yellow Hypergiants
Kraus, Michaela; Torres, Andrea F.; Kourniotis, Michalis +2 more
Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedded in circumstellar shells and disks. We present K-band spectra of two B[e]SGs from the Large Magel…
Discovering New B[e] Supergiants and Candidate Luminous Blue Variables in Nearby Galaxies
Bonanos, Alceste Z.; Maravelias, Grigoris; Tramper, Frank +3 more
Mass loss is one of the key parameters that determine stellar evolution. Despite the progress we have achieved over the last decades we still cannot match the observational derived values with theoretical predictions. Even worse, there are certain phases, such as the B[e] supergiants (B[e]SGs) and the Luminous Blue Variables (LBVs), where signific…
Complex Organics in Space: A Changing View of the Cosmos
Kwok, Sun
Planetary explorations have revealed that complex organics are widely present in the solar system. Astronomical infrared spectroscopic observations have discovered that complex organics are synthesized in large quantities in planetary nebulae and distributed throughout the galaxy. Signatures of organics have been found in distant galaxies, as earl…
Reddening-Free Q Parameters to Classify B-Type Stars with Emission Lines
Aidelman, Yael; Cidale, Lydia Sonia
The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus, it is relevant to deal with appropriate classification criteria to avoid as many selection ef…