Side-by-side comparison shows an ALMA image of comet 46P/Wirtanen (left) and an optical image (right). The ALMA image has approximately 1000 times the resolution of the optical image and zooms in on the inner portion of the comet’s diffuse coma.
Astronomers using ALMA have found two young stars with wildly different masses forming in the same protoplanetary disk. The main central star, MM1a, is 80 times more massive than its companion, MM1b. Their striking difference in size suggests that they formed by following two very different paths. The more massive star took the more traditional route by collapsing under gravity out of a dense “core” of gas. The smaller one likely followed the road less traveled by – at least for stars – by accumulating mass from a portion of the disk that “fragmented” away as it matured, a process that may have more in common with the birth of gas-giant planets. Observation of the dust emission (green) and the cool gas around MM1a (red is receding gas, blue is approaching gas), indicates that the outflow cavity rotates in the same sense as the central accretion disc. MM1b is seen orbiting in the lower left.
A team of astronomers has conducted ALMA‘s first large-scale, high-resolution survey of protoplanetary disks. Known as the Disk Substructures at High Angular Resolution Project (DSHARP), this “Large Program” of ALMA has yielded stunning, high-resolution images of 20 nearby protoplanetary disks and given astronomers new insights into the variety of features they contain and the speed with which planets can emerge.
Artist impression of W2246-0526, the most luminous known galaxy, and three companion galaxies. New observations with the Atacama Large Millimeter/submillimeter Array (ALMA) reveal distinct streamers of material being pulled from the three smaller galaxies and flowing into the more massive galaxy, which was discovered in 2015 by NASA’s space-based Wide-field Infrared Survey Explorer (WISE). It is by no means the largest or most massive galaxy we know of, but it is unrivaled in its brightness, emitting as much infrared light as 350 trillion Suns.
ALMA image reveals how W2246-0526 is being fed by three companion galaxies through trans-galactic streamers of gas. The main galaxy and one of its companions are in the center. To the lower left is another companion and its large tidal tail that connects it to the main galaxy. The upper left concentration is the third such companion galaxy.
Composite image of the Abell 2597 galaxy cluster showing the fountain-like flow of gas powered by the supermassive black hole in the central galaxy. The yellow is ALMA data of the cold gas. The red is data from the Very Large Telescope showing the hot hydrogen gas in the same region. The extend purple is the extended hot, ionized gas as imaged by the Chandra X-ray Observatory.