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9 papers
First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
The Event Horizon Telescope Collaboration
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A), the Galactic center source associated with a supermassive black hole. These observati…
CONCERTO at APEX: installation and technical commissioning
A. Monfardini, A. Beelen, A. Benoit +41
We describe the deployment and first tests on Sky of CONCERTO, a large field-of-view (18.6arc-min) spectral-imaging instrument. The instrument operates in the range 130-310GHz from…
4GREAT -- a four-color receiver for high-resolution airborne terahertz spectroscopy
Carlos A. Durán, Rolf Güsten, Christophe Risacher +13
4GREAT is an extension of the German Receiver for Astronomy at Terahertz frequencies (GREAT) operated aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The spect…
Terahertz Water Masers: II. Further SOFIA/GREAT Detections toward Circumstellar Outflows, and a Multitransition Analysis
David A. Neufeld, Karl M. Menten, Carlos Durán +8
Following up on our discovery of terahertz water masers, reported in 2017, we report two further detections of water maser emission at frequencies above 1 THz. Using the GREAT inst…
The Atacama Large Aperture Submillimetre Telescope (AtLAST)
Pamela D. Klaassen, Tony Mroczkowski, Claudia Cicone +11
The coldest and densest structures of gas and dust in the Universe have unique spectral signatures across the (sub-)millimetre bands (~GHz). The current generation…
A Search for Light Hydrides in the Envelopes of Evolved Stars
Mark A. Siebert, Ignacio Simon, Christopher N. Shingledecker +7
We report a search for the diatomic hydrides SiH, PH, and FeH along the line of sight toward the chemically rich circumstellar envelopes of IRC+10216 and VY Canis Majoris. These mo…