![]() Observing interplanetary spacecraft with radio telescopes: connecting astronomers and space scientists Giuseppe Cimò Our relative proximity to the Galactic center provides an unprecedented view of a galactic core and studies of this region can be used as an astrophysical analog to understanding the nuclei of more distant galaxies. In addition, we have been studying the detailed structure of the synchrotron-emitting radio filaments and their connection to larger-scale energetic outflows from the Galactic center. I will review observational results from several recent studies undertaken by my research group: we have examined the properties and kinematics of a group of unusual molecular clouds that appear to be part of an orbital “stream” of material around the Galactic center. In addition, radio observations have revealed a population of synchrotron-emitting filaments that provide insight on the magnetic field strength and configuration in this unique region of the Galaxy. Dense and massive molecular clouds on non-circular orbits are abundant in this region, yet star formation is not as active and frequent as expected. In addition to harboring a supermassive black hole at its very core, the Galactic center is one of the most physically extreme environments in the Galaxy. High resolution observations of magnetic fields in the Central Molecular Zone of the Galactic Center Cornelia C. ![]() In this talk, we will discuss the current state of the scientific knowledge regarding these topics while sharing our contributions: (i) multi-epoch multi-wavelength observations of a substellar triple system (ii) new radio detections in several UCDs, including three binary low-mass systems, and, remarkably, a T6-object and (iii) the sub-mas morphology of UCDs displaying auroral radio emission. Despite this great potential, only a handful of VLBI observations of UCDs have been successful. The great utility of radio observations is amplified in the case of binary systems as sub-mas astrometry can determine the dynamical masses. Such observations are crucial not only to directly measure the strength and topology of the UCDs’ magnetic fields but also for opening a new route for the detection of exoplanetary radio emission, and hence, establishing a novel tool to discover new worlds. ClimentĪt the very low mass regime of stellar and substellar objects, ultra-cool dwarfs (UCDs) cover the boundary between stars and exoplanets where radio observations have already proved the existence of powerful magnetic fields. Watch it again in our EVN/JIVE YouTube channelĮxploring the lowest mass objects at the highest angular resolution: low-mass stars, ultracool dwarfs and exoplanets Juan B. The next generation of radio telescopes such as the SKA will open a new window on detecting seed black holes at birth, probing the formation pathways of the first quasars in the Universe. I will show how radio interferometric observations have been key to identify and characterize actively accreting IMBHs in the local Universe and out to z ~ 3. Studying this population of high-redshift seeds has so far only been possible by investigating the possible local relics of those that did not become supermassive, which can be found in the local Universe as intermediate-mass black holes (IMBHs) in dwarf galaxies. Easther Appendices Index.Intermediate-mass black holes in the era of radio astronomy Mar Mezcuaīlack holes of 100–100,000 solar masses formed at redshifts of z < 20 are currently the best candidates to being the seeds of the first supermassive black holes that power the quasars detected at z ~ 6–7. Applications of Astrometry to Topics in Astrophysics: 22. Astrometric catalogs: concepts, history and necessity C. From measures to celestial coordinates Z. Analyzing poorly-sampled images: HST imaging astrometry J. Using CCDs in the time-delayed integration mode D. From Detected Photons to the Celestial Sphere: 13. Astrometry with ground-based diffraction-limited imaging A. The Earth's atmosphere: refraction, turbulence, delays and limitations to astrometic precision W. Fundamental algorithms for celestial coordinates and positions P. Celestial coordinate systems and positions N. Celestial mechanics of the N-body problem S. Relativistic principles of astrometry and celestial mechanics S. Vectors in astrometry, an introduction L. ![]() ![]() Relativistic Foundations of Astrometry and Celestial Mechanics: 4. Ground-based opportunities for astrometry N. Opportunities and challenges for astrometry in the twenty-first century M. Astrometry in the Twenty-First Century: 1. ![]()
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