The ALMA phasing system: A beamforming capability for ultra-high-resolution science at (sub)millimeter wavelengths
Artikel i vetenskaplig tidskrift, 2018

The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware and software necessary to coherently sum the signals of individual ALMA antennas and record the aggregate sum in Very Long Baseline Interferometry (VLBI) Data Exchange Format. These beamforming capabilities allow the ALMA array to collectively function as the equivalent of a single large aperture and participate in global VLBI arrays. The inclusion of phased ALMA in current VLBI networks operating at (sub) millimeter wavelengths provides an order of magnitude improvement in sensitivity, as well as enhancements in u–v coverage and north–south angular resolution. The availability of a phased ALMA enables a wide range of new ultra-high angular resolution science applications, including the resolution of supermassive black holes on event horizon scales and studies of the launch and collimation of astrophysical jets. It also provides a high-sensitivity aperture that may be used for investigations such as pulsar searches at high frequencies. This paper provides an overview of the ALMA Phasing System design, implementation, and performance characteristics.

Instrumentation: interferometers

Methods: observational

Instrumentation: high angular resolution

Författare

L. D. Matthews

Massachusetts Institute of Technology (MIT)

G. Crew

Massachusetts Institute of Technology (MIT)

S. Doeleman

Massachusetts Institute of Technology (MIT)

Harvard-Smithsonian Center for Astrophysics

R. Lacasse

National Radio Astronomy Observatory

A. F. Saez

Joint ALMA Observatory

W. Alef

Max Planck-institutet

K. Akiyama

Massachusetts Institute of Technology (MIT)

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

R. Amestica

National Radio Astronomy Observatory

J. M. Anderson

Deutsches GeoForschungsZentrum (GFZ)

Max Planck-institutet

D. A. Barkats

Joint ALMA Observatory

Harvard-Smithsonian Center for Astrophysics

A. Baudry

Universite de Bordeaux

D. Broguière

Institut de RadioAstronomie Millimetrique (IRAM)

R. Escoffier

National Radio Astronomy Observatory

V. Fish

Massachusetts Institute of Technology (MIT)

J. Greenberg

National Radio Astronomy Observatory

M. H. Hecht

Massachusetts Institute of Technology (MIT)

R. Hiriart

National Radio Astronomy Observatory Socorro

A. Hirota

Joint ALMA Observatory

M. Honma

The Graduate University for Advanced Studies (SOKENDAI)

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

P. T.P. Ho

Academia Sinica

C. M. V. Impellizzeri

Joint ALMA Observatory

M. Inoue

Academia Sinica

Y. Kohno

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

B. Lopez

Joint ALMA Observatory

Ivan Marti-Vidal

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

H. Messias

Joint ALMA Observatory

European Southern Observatory Santiago

Z. Meyer-Zhao

Academia Sinica

M. Mora-Klein

National Radio Astronomy Observatory

N. M. Nagar

Universidad de Concepción

H. Nishioka

Academia Sinica

T. Oyama

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

V. Pankratius

Massachusetts Institute of Technology (MIT)

J. Perez

National Radio Astronomy Observatory

N. Phillips

Joint ALMA Observatory

N. Pradel

Academia Sinica

H. Rottmann

Max Planck-institutet

A. Roy

Max Planck-institutet

C. Ruszczyk

Massachusetts Institute of Technology (MIT)

B. Shillue

National Radio Astronomy Observatory

S. Suzuki

National Institutes of Natural Sciences - National Astronomical Observatory of Japan

R. Treacy

National Radio Astronomy Observatory

Publications of the Astronomical Society of the Pacific

0004-6280 (ISSN) 1538-3873 (eISSN)

Vol. 130 015002

Ämneskategorier

Annan data- och informationsvetenskap

Signalbehandling

Annan elektroteknik och elektronik

DOI

10.1088/1538-3873/aa9c3d