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OH maser emission i...
OH maser emission in the THOR survey of the northern Milky Way
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- Beuther, H. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Walsh, A. (author)
- Macquarie University
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- Wang, Y. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Rugel, M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Soler, J. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Linz, H. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Klessen, R. S. (author)
- Ruprecht-Karls-Universität Heidelberg,Heidelberg University
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- Anderson, L. D. (author)
- West Virginia University,Green Bank Observatory
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- Urquhart, J. S. (author)
- University Of Kent
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- Glover, S. C. O. (author)
- Ruprecht-Karls-Universität Heidelberg,Heidelberg University
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- Billington, S. J. (author)
- University Of Kent
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- Kainulainen, Jouni, 1979 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Menten, K. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Roy, N. (author)
- Indian Institute of Science
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- Longmore, S. N. (author)
- Liverpool John Moores University
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- Bigiel, F. (author)
- Universität Bonn,University of Bonn
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Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) Macquarie University (creator_code:org_t)
- 2019-08-12
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 628
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Abstract
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- Context. OH masers trace diverse physical processes, from the expanding envelopes around evolved stars to star-forming regions or supernovae remnants. Providing a survey of the ground-state OH maser transitions in the northern hemisphere inner Milky Way facilitates the study of a broad range of scientific topics. Aims. We want to identify the ground-state OH masers at similar to 18 cm wavelength in the area covered by The HI/OH/Recombination line survey of the Milky Way (THOR). We will present a catalogue of all OH maser features and their possible associated environments. Methods. The THOR survey covers longitude and latitude ranges of 14 degrees.3 < l < 66 degrees.8 and b < +/- 1 degrees.25. All OH ground state lines (2)Pi(3/2) (J = 3/2) at 1612 (F = 1-2), 1665 (F = 1-1), 1667 (F = 2-2) and 1720 MHz (F = 2-1) have been observed, employing the Very Large Array (VLA) in its C configuration. The spatial resolution of the data varies between 12.5 '' and 19 '', the spectral resolution is 1.5 km s(-1), and the rms sensitivity of the data is similar to 10 mJy beam(-1) per channel. Results. We identify 1585 individual maser spots (corresponding to single spectral features) distributed over 807 maser sites (regions of size similar to 10(3)-10(4) AU). Based on different criteria from spectral profiles to literature comparison, we try to associate the maser sites with astrophysical source types. Approximately 51% of the sites exhibit the double-horned 1612 MHz spectra typically emitted from the expanding shells of evolved stars. The separations of the two main velocity features of the expanding shells typically vary between 22 and 38 km s(-1). In addition to this, at least 20% of the maser sites are associated with star-forming regions. While the largest fraction of 1720 MHz maser spots (21 out of 53) is associated with supernova remnants, a significant fraction of the 1720 MHz maser spots (17) are also associated with star-forming regions. We present comparisons to the thermal (CO)-C-13(1-0) emission as well as to other surveys of class II CH3OH and H2O maser emission. The catalogue attempts to present associations to astrophysical sources where available, and the full catalogue is available in electronic form. Conclusions. This OH maser catalogue presents a unique resource of stellar and interstellar masers in the northern hemisphere. It provides the basis for a diverse range of follow-up studies from envelopes around evolved stars to star-forming regions and Supernova remnants.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
Keyword
- stars: evolution
- stars: formation
- ISM: kinematics and dynamics
- masers
- ISM: clouds
- catalogs
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Beuther, H.
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Walsh, A.
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Wang, Y.
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Rugel, M.
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Soler, J.
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Linz, H.
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Klessen, R. S.
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Anderson, L. D.
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Urquhart, J. S.
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Glover, S. C. O.
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Billington, S. J ...
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Kainulainen, Jou ...
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Menten, K. M.
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Roy, N.
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Longmore, S. N.
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Bigiel, F.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geosciences Mult ...
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Astronomy and As ...
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Chalmers University of Technology