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    The HI/OH/Recombination line survey of the inner Milky Way (THOR): Survey overview and data release 1

    250318.pdf (7.789Mb)
    Access Status
    Open access
    Authors
    Beuther, H.
    Bihr, S.
    Rugel, M.
    Johnston, K.
    Wang, Y.
    Walter, F.
    Brunthaler, A.
    Walsh, Andrew
    Ott, J.
    Stil, J.
    Henning, T.
    Schierhuber, T.
    Kainulainen, J.
    Heyer, M.
    Goldsmith, P.
    Anderson, L.
    Longmore, S.
    Klessen, R.
    Glover, S.
    Urquhart, J.
    Plume, R.
    Ragan, S.
    Schneider, N.
    McClure-Griffiths, N.
    Menten, K.
    Smith, R.
    Roy, N.
    Shanahan, R.
    Nguyen-Luong, Q.
    Bigiel, F.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Beuther, H. and Bihr, S. and Rugel, M. and Johnston, K. and Wang, Y. and Walter, F. and Brunthaler, A. et al. 2016. The HI/OH/Recombination line survey of the inner Milky Way (THOR): Survey overview and data release 1. Astronomy and Astrophysics. 595: A32.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201629143
    ISSN
    0004-6361
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO.

    URI
    http://hdl.handle.net/20.500.11937/50723
    Collection
    • Curtin Research Publications
    Abstract

    Context. The past decade has witnessed a large number of Galactic plane surveys at angular resolutions below 20''. However, no comparable high-resolution survey exists at long radio wavelengths around 21 cm in line and continuum emission. Aims. We remedy this situation by studying the northern Galactic plane at ~20'' resolution in emission of atomic, molecular, and ionized gas. Methods. Employing the Karl G. Jansky Very Large Array (VLA) in the C-array configuration and a large program, we observe the HI 21 cm line, four OH lines, nineteen Hna radio recombination lines as well as the continuum emission from 1 to 2 GHz in full polarization over a large part of the first Galactic quadrant. Results. Covering Galactic longitudes from 14.5 to 67.4 deg and latitudes between ± 1.25 deg, we image all of these lines and the continuum at ~20'' resolution. These data allow us to study the various components of the interstellar medium (ISM): from the atomic phase, traced by the HI line, to the molecular phase, observed by the OH transitions, to the ionized medium, revealed by the cm continuum and the Hna radio recombination lines. Furthermore, the polarized continuum emission enables magnetic field studies. In this overview paper, we discuss the survey outline and present the first data release as well as early results from the different datasets. We now release the first half of the survey; the second half will follow later after the ongoing data processing has been completed. The data in fits format (continuum images and line data cubes) can be accessed through the project web-page. Conclusions. The HI/OH/Recombination line survey of the Milky Way (THOR) opens a new window to the different parts of the ISM. It enables detailed studies of molecular cloud formation, conversion of atomic to molecular gas, and feedback from Hii regions as well as the magnetic field in the Milky Way. It is highly complementary to other surveys of our Galaxy, and comparing the different datasets will allow us to address many open questions. © ESO, 2016.

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