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EHT-HOPS pipeline for millimeter VLBI data reduction

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arxiv 1903.08832 v2 pith:WFV6PENA submitted 2019-03-21 astro-ph.IM astro-ph.HE

EHT-HOPS pipeline for millimeter VLBI data reduction

Lindy Blackburn , Chi-kwan Chan , Geoffrey B. Crew , Vincent L. Fish , Sara Issaoun , Michael D. Johnson , Maciek Wielgus , Kazunori Akiyama
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John Barrett Katherine L. Bouman Roger Cappallo Andrew A. Chael Michael Janssen Colin J. Lonsdale Sheperd S. Doeleman
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keywords vlbidatamillimeterpipelinecalibrationglobalobservationsreduction
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We present the design and implementation of an automated data calibration and reduction pipeline for very-long-baseline interferometric (VLBI) observations taken at millimeter wavelengths. These short radio-wavelengths provide the best imaging resolution available from ground-based VLBI networks such as the Event Horizon Telescope (EHT) and the Global Millimeter VLBI Array (GMVA), but require specialized processing due to the strong effects from atmospheric opacity and turbulence as well as the heterogeneous nature of existing global arrays. The pipeline builds upon a calibration suite (HOPS) originally designed for precision geodetic VLBI. To support the reduction of data for astronomical observations, we have developed an additional framework for global phase and amplitude calibration which provides output in a standard data format for astronomical imaging and analysis. We test the pipeline on observations taken at 3.5 mm (86 GHz) by the GMVA joined by the phased Atacama Large Millimeter/submillimeter Array in April 2017, and demonstrate the benefits from the specialized processing of high frequency VLBI data with respect to classical analysis techniques.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole

    astro-ph.GA 2019-06 accept novelty 9.0

    The first event-horizon-scale image of the M87 black hole shows a 42 microarcsecond diameter ring with a central brightness depression, consistent with the shadow of a Kerr black hole.

  2. First M87 Event Horizon Telescope Results. II. Array and Instrumentation

    astro-ph.IM 2019-06 accept novelty 7.0

    The EHT team reports the array configuration, instrumentation upgrades, and performance metrics that supported the 2017 global VLBI campaign and M87 black hole imaging at ~25 micro-arcsecond resolution.

  3. First M87 Event Horizon Telescope Results. III. Data Processing and Calibration

    astro-ph.GA 2019-06 unverdicted novelty 6.0

    The EHT collaboration developed and validated three calibration pipelines for 1.3mm VLBI observations, revealing variability in M87's compact emission.