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Ultracompact HII re...
Ultracompact HII regions with extended emission: The complete view
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- De La Fuente, Eduardo (författare)
- Universidad de Guadalajara,University of Guadalajara
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- Porras, Alicia (författare)
- Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)
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- Trinidad, Miguel A. (författare)
- Universidad de Guanajuato
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- Kurtz, S. (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Kemp, Simon N. (författare)
- Universidad de Guadalajara,University of Guadalajara
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- Tafoya, Daniel, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Franco, Jose (författare)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Rodriguez-Rico, Carlos (författare)
- Universidad de Guanajuato
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(creator_code:org_t)
- 2019-12-18
- 2020
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 492:1, s. 895-914
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https://research.cha... (primary) (free)
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https://academic.oup...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- © 2019 The Author(s). In this paper, we present the results of a morphological study performed on a sample of 28 ultracompact HII (UC HII) regions located near extended free-free emission, using radio continuum (RC) observations at 3.6 cm with the C and D Very Large Array (VLA) configurations, with the aim of determining a direct connection between them. By using previously published observations in B and D VLA configurations, we compiled a final catalogue of 21 UC HII regions directly connected with the surrounding extended emission (EE). The observed morphology of most of the UC HII regions in RC emission is irregular (single- or multipeaked sources) and resembles a classical bubble structure in the Galactic plane with well-defined cometary arcs. RC images superimposed on colour composite Spitzer images reinforce the assignations of direct connection by the spatial coincidence between the UC components and regions of saturated 24 μm emission. We also find that the presence of EE may be crucial to understand the observed infrared excess because an underestimation of ionizing Lyman photons was considered in previous works (e.g. Wood & Churchwell; Kurtz, Churchwell & Wood).
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Radio continuum: ISM
- Stars: pre-main-sequence
- ISM: bubbles
- HII regions
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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