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Six years of short-spaced monitoring of the v =1 and v =2 , J =1 0 28 SiO maser emission in evolved stars
We present the results from a monitoring of the $v=1$ and $v=2$, $J=1{-}0$ 28 SiO maser emission in 21 objects, covering all types of known SiO maser emitters: 13 Mira variables, 2 long period semiExpand
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Hot Expanding Shells in the Envelope of the Sagittarius B2 Molecular Cloud
We present high-resolution (3'') maps of the (3, 3) and (4, 4) lines of NH3 toward the southern part of the molecular envelope of the Sagittarius B2 star-forming region. These maps reveal, for theExpand
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The Size, Shape, and Scattering of Sagittarius A∗ at 86 GHz: First VLBI with ALMA
The Galactic center supermassive black hole Sagittarius A∗ (Sgr A∗) is one of the most promising targets to study the dynamics of black hole accretion and outflow via direct imaging with very longExpand
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First Results of the FAST-S/X Sessions with New VGOS Antennas
Space and laboratory discovery of HC3S+
We report the detection in TMC-1 of the protonated form of C3S. The discovery of the cation HC3S was carried through the observation of four harmonically related lines in the Q band using the YebesExpand
Discovery of CH2CHCCH and detection of HCCN, HC4N, CH3CH2CN, and, tentatively, CH3CH2CCH in TMC-1
We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC4N, and CH3CH2CN. A tentative detection of CH3CH2CCH is alsoExpand
Very fast variations of SiO maser emission in evolved stars
Context. Stars on the asymptotic giant branch (AGB) are long-period variables that present strong flux variations at almost all wavelengths, including the SiO maser lines. The periods of theseExpand
The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering
The high brightness temperatures, $T_\mathrm{b}\gtrsim 10^{13}$ K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. RefractiveExpand
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The limb-brightened jet of M 87 down to 7 Schwarzschild radii scale
M 87 is one of the nearest radio galaxies with a prominent jet extending from sub-pc to kpc-scales. Because of its proximity and large mass of the central black hole, it is one of the best radioExpand