PHANGS-ALMA Data Processing and Pipeline

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00553793" target="_blank" >RIV/67985815:_____/21:00553793 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3847/1538-4365/abec80" target="_blank" >https://doi.org/10.3847/1538-4365/abec80</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4365/abec80" target="_blank" >10.3847/1538-4365/abec80</a>

Result language

angličtina

Original language name

PHANGS-ALMA Data Processing and Pipeline

Original language description

We describe the processing of the PHANGS-ALMA survey and present the PHANGS-ALMA pipeline, a public software package that processes calibrated interferometric and total power data into science-ready data products. PHANGS-ALMA is a large, high-resolution survey of CO(2-1) emission from nearby galaxies. The observations combine ALMA's main 12 m array, the 7 m array, and total power observations, and use mosaics of dozens to hundreds of individual pointings. We describe the processing of the u - v data, imaging and deconvolution, linear mosaicking, combining interferometer and total power data, noise estimation, masking, data product creation, and quality assurance. Our pipeline has a general design and can also be applied to Very Large Array and ALMA observations of other spectral lines and continuum emission. We highlight our recipe for deconvolution of complex spectral line observations, which combines multiscale clean, single-scale clean, and automatic mask generation in a way that appears robust and effective. We also emphasize our two-track approach to masking and data product creation. We construct one set of “broadly masked” data products, which have high completeness but significant contamination by noise, and another set of “strictly masked” data products, which have high confidence but exclude faint, low signal-to-noise emission. Our quality assurance tests, supported by simulations, demonstrate that 12 m+7 m deconvolved data recover a total flux that is significantly closer to the total power flux than the 7 m deconvolved data alone. In the appendices, we measure the stability of the ALMA total power calibration in PHANGS-ALMA and test the performance of popular short-spacing correction algorithms.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

—

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal. Supplement Series

ISSN

0067-0049

e-ISSN

1538-4365

Volume of the periodical

255

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

54

Pages from-to

19

UT code for WoS article

000674462200001

EID of the result in the Scopus database

2-s2.0-85111314090