First Very Long Baseline Interferometry Detections at 870 μm
The Astronomical Journal, vol. 168, pp. 130
Abstract
Abstract The first very long baseline interferometry (VLBI) detections at 870 μ m wavelength (345 GHz frequency) are reported, achieving the highest diffraction-limited angular resolution yet obtained from the surface of the Earth and the highest-frequency example of the VLBI technique to date. These include strong detections for multiple sources observed on intercontinental baselines between telescopes in Chile, Hawaii, and Spain, obtained during observations in 2018 October. The longest-baseline detections approach 11 G λ , corresponding to an angular resolution, or fringe spacing, of 19 μ as. The Allan deviation of the visibility phase at 870 μ m is comparable to that at 1.3 mm on the relevant integration timescales between 2 and 100 s. The detections confirm that the sensitivity and signal chain stability of stations in the Event Horizon Telescope (EHT) array are suitable for VLBI observations at 870 μ m. Operation at this short wavelength, combined with anticipated enhancements of the EHT, will lead to a unique high angular resolution instrument for black hole studies, capable of resolving the event horizons of supermassive black holes in both space and time.
Authors 99
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California Institute of Technology · Jet Propulsion Laboratory · Harvard University · Center for Astrophysics Harvard & Smithsonian
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Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA; sdoeleman@cfa.harvard.edu
Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Current address is Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA
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Sheperd S. Doeleman corresponding
Harvard University · Center for Astrophysics Harvard & Smithsonian
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Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA
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Institute of Astronomy and Astrophysics, Academia Sinica · Academia Sinica
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Harvard University · Center for Astrophysics Harvard & Smithsonian
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Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA
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University of Hawaiʻi at Mānoa · Institute of Astronomy and Astrophysics, Academia Sinica
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Institute of Astronomy and Astrophysics, Academia Sinica, 645 North A’ohoku Place, Hilo, HI 96720, USA
Institute of Astronomy and Astrophysics, Academia Sinica, 645 North A'ohoku Place, Hilo, HI 96720, USA
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Institut de Radioastronomie Millimétrique
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Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
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Institut de Radioastronomie Millimétrique
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Institute of Astronomy and Astrophysics, Academia Sinica · Academia Sinica
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Massachusetts Institute of Technology
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Max Planck Institute for Radio Astronomy
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Massachusetts Institute of Technology
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Institut de Radioastronomie Millimétrique
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University of Cagliari · Osservatorio Astronomico di Cagliari
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Institute of Astronomy and Astrophysics, Academia Sinica · Academia Sinica
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Massachusetts Institute of Technology
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Institute of Astronomy and Astrophysics, Academia Sinica · Academia Sinica
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