EHT-HOPS pipeline for millimeter VLBI data reduction. (arXiv:1903.08832v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Blackburn_L/0/1/0/all/0/1">Lindy Blackburn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chan_C/0/1/0/all/0/1">Chi-kwan Chan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Crew_G/0/1/0/all/0/1">Geoffrey B. Crew</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fish_V/0/1/0/all/0/1">Vincent L. Fish</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Issaoun_S/0/1/0/all/0/1">Sara Issaoun</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Johnson_M/0/1/0/all/0/1">Michael D. Johnson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wielgus_M/0/1/0/all/0/1">Maciek Wielgus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Akiyama_K/0/1/0/all/0/1">Kazunori Akiyama</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barrett_J/0/1/0/all/0/1">John Barrett</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bouman_K/0/1/0/all/0/1">Katherine L. Bouman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cappallo_R/0/1/0/all/0/1">Roger Cappallo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chael_A/0/1/0/all/0/1">Andrew A. Chael</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Janssen_M/0/1/0/all/0/1">Michael Janssen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lonsdale_C/0/1/0/all/0/1">Colin J. Lonsdale</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Doeleman_S/0/1/0/all/0/1">Sheperd S. Doeleman</a>

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.

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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